Energy and Bio-thermal Systems


 

Energy and Bio-thermal Systems

The Energy and Bio-Thermal Systems (EBTS) Group is one of 6 groups in the Department of Mechanical Engineering. The Group has 10 faculty members and a complement of research fellows, engineers and experienced laboratory officers. The Group has 32 graduate students. Annually, the Group offers some 60 final year projects.

EBTS relates to the application of heat transfer principles and applied thermodynamics to solving problems on efficient and rational use of energy as well as investigation of thermal influence on certain surgical procedures in the medical field. The group's interests cover industrial thermal processes, heat recovery systems, energy performance of large buildings and associated plants, thermal behaviour of building envelopes and components, active drying systems, solar energy application, ventilation, heat transfer in IC chips and packages, cryosurgery, and special areas in micro combustion and heat transfer.

The group seeks alternatives to energy efficiency improvement and diversification. It is actively involved in building up local expertise in the application of energy technology in the building, industrial and transportation sectors. Pre-competitive research and the development of core competencies in clean energy and thermal processes help strengthen our industry's technological capability. This advantage enhances Singapore's competitiveness as a global centre for trade, communications and advanced manufacturing. EBTS Group Laboratories

The EBTS Group has four laboratories, namely, the Air Conditioning Laboratory, Energy Conversion Laboratory, Thermal Process Laboratory 1, and Thermal Process Laboratory 2. These laboratories cater mainly to undergraduate level teaching experiments, and final year and graduate level research projects. The undergraduate level teaching experiments serve to reinforce fundamental concepts and provide basic training on performance evaluation of thermal systems, convection heat transfers, and measurements of thermodynamic properties. group also works closely with other research institutes in Singapore and other international universities.

Final Year and Graduate Level Research Projects

Final year and graduate level research projects are offered mainly in the following areas: Absorption Chillers, Adsorption Chillers, Micro-channel Cooling, Absorber Analysis, Energy Storage, Desalination, Heat-pump Drying, Co-generation Systems, Micro Thermophotovoltaic Power Generator and Micro-Thrusters.


Photographs of some of the final year and graduate level research projects

Full-Time Staff

 
Dr CHOU Siaw Kiang
Professor

National University of Singapore
Dept. of Mechanical Engineering
Contact : +65-6516-2215
+65-6516-2000

Curriculum Vitae

Research Interests
Energy performance; micro combustion; clean power



Publications
Please check out this link:
Publications

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CHOU Siaw Kiang
Professor
+65-6516-2215
+65-6516-2000
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Dr CHUA Kian Jon, Ernest
Assistant Professor

National University of Singapore
Dept. of Mechanical Engineering
Contact : +65-6516-2558



Qualification
Ph.D., MASHRAE, MASME

Modules Taught
ME4226: Energy and Thermal Systems Analysis; ME4223: Thermal Environmental Engineering; ME3221: Energy Conversion; ME2121: Engineering Thermodynamics; and ME3101: Mechanical System Design

Research Interests
Renewable/Clean Energy Technologies - Hybridization of RE Technologies; Solar-Thermal Energy Systems; Biomass – Exergy Analysis; Heat Recovery Systems; Building Energy Management and Total Performance; Trigeneration Systems; Co-generation Systems; Agricultural Greenhouses

Bio-Thermal Processes - Cryosurgery; Cryopreservation; Cryogenic Spray Cooling; Bone-Drilling; Laser Eye Surgery


Publications
Selected Publications
-----------------------
1. K. J. Chua, and S. K. Chou, 2003, On the Study of the drying behaviour of a heat-sensitive biomaterial undergoing stepwise-varying temperature schemes, Industrial and Engineering Chemistry Research, 42, pp. 4939-4952.

2. K.J. Chua, S.K. Chou and J.C. Ho, 2005, An analytical study on the thermal effects of cryosurgery on selective cell destruction, Journal of Biomechanics, 40(1), 100-116.

3. K.J. Chua, J.C. Ho, S.K. Chou and M.R. Islam, 2005, On the study of the temperature distribution within a human eye subjected to a laser source, International Communications in Heat and Mass Transfer, 32, 1057-1065.

4. K.J. Chua and S.K. Chou, 2005, A modular approach to study the performance of a two-stage heat pump system, Applied Thermal Energy, 25, 1363-1379.

5. S.K. Chou, K.J. Chua, S.H. Teoh, K.K. Lim and W.Q. Sun., 2007, Development of pressure swing adsorption dehydration system for preservation of dermal tissues, Materials Science and Engineering: C, 27(2), 313-324.

6. K.J. Chua, J.C. Ho and S.K. Chou, 2007, A comparative study of different control strategies for indoor air humidity, Energy and Buildings, 39(5), 537-545.


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CHUA Kian Jon, Ernest
Assistant Professor
+65-6516-2558
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Dr KOH Yee Kan
Assistant Professor

E2-02-29
Contact : +65-6516-7601
Homepage: http://serve.me.nus.edu.sg/mpekyk

Dr. Koh received a B.Eng. (1st class honors) and a M.Eng. both in Mechanical Engineering from University of Technology Malaysia. In 2004, he enrolled in the University of Illinois at Urbana-Champaign, and obtained a M.S. in Physics in 2007 and a Ph.D. in Materials Science and Engineering in 2010 from the university. Dr. Koh’s expertise is in heat transport in nanostructures and across interfaces, with emphasis on applications in thermoelectric energy conversion. He is an expert in time-domain thermoreflectance, a pump-probe technique to measure the thermal properties of nanostructures using an ultrafast Ti:sapphire laser. He has received numerous awards, including the highly competitive Ross Martin award (2010), the Racheff-Intel award (2009) and the prestigious Fulbright fellowship (2004).

Qualification
PhD in MSE and MS in Physics, U of Illinois, Urbana-Champaign; BEng in ME, UTM Malaysia

Research Interests
OPENINGS FOR NEW GRADUATE STUDENTS AND FINAL-YEAR PROJECTS!
PLEASE E-MAIL ME FOR THE DETAILS.

My research is in the area of nanoscale energy transport and conversion. Specifically, I am working on:

- Designing new thermoelectric materials and nanostructures. Waste heat (for example from car exhaust) could be converted directly into useful electricity through a phenomenon called thermoelectrics. My interest is to design a new Si-based nanostructure with high efficiency of thermoelectric energy conversion. Potential applications are in electric cars and in the thermal management of electronic devices.

- heat transport across graphene interfaces. Graphene is a single atomic layer of crystalline carbon atoms, which could replace Si as the next generation electronic material. Heat dissipation from graphene devices depend on the thermal conductance of graphene interfaces. My interest is to study how heat is transported across graphene interfaces.

Please visit my personal website for more details.

Publications
Selected

1) Yee Kan Koh, Myung-Ho Bae, D. G. Cahill, and Eric Pop, “Heat conduction across monolayer and few-layer graphenes,” Nano Lett. 10, 4363 (2010).

2) A. I. Persson*, Yee Kan Koh*, D. G. Cahill, L. Samuelson, and H. Linke, “Thermal conductance of InAs nanowire composites,” Nano Lett. 9, 4484 (2009).
* The authors contribute equally to the work.

3) Yee Kan Koh, C. J. Vineis, S. D. Calawa, M. P. Walsh, and D. G. Cahill, “Lattice thermal conductivity of nanostructured thermoelectric materials based on PbTe,” Appl. Phys. Lett. 94, 153101 (2009).

4) Yee Kan Koh, S. L. Singer, W. Kim, J. M. O. Zide, H. Lu, D. G. Cahill, A. Majumdar, and A. C. Gossard, “Comparison of the 3w method and time-domain thermoreflectance for measurements of the cross-plane thermal conductivity of epitaxial semiconductors,” J. Appl. Phys. 105, 054303 (2009).

5) V. Rawat, Yee Kan Koh, D. G. Cahill, and T. D. Sands, “Thermal conductivity of (Zr,W)N/ScN metal/semiconductor multilayers and superlattices,” J. Appl. Phys. 105, 024909 (2009).

6) Yee Kan Koh, Y. Cao, D. G. Cahill, and D. Jena, “Heat-transport mechanisms in superlattices,” Adv. Funct. Mater. 19, 610 (2009).

7) Yee Kan Koh and D. G. Cahill, “Frequency dependence of the thermal conductivity of semiconductor alloys,” Phys. Rev. B 76, 075207 (2007).

8) Z. Wang, J. A. Carter, A. Lagutchev, Yee Kan Koh, N.-H. Seong, D. G. Cahill, and D. D. Dlott, “Ultrafast flash thermal conductance of molecular chains,” Science 317, 787 (2007).


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KOH Yee Kan
Assistant Professor
+65-6516-7601
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Dr NG Kim Choon
Professor

National University of Singapore
Dept. of Mechanical Engineering
Contact : +65-6516-2214

He obtained BSc(1975) and PhD(1980) degrees from Strathclyde Univ (UK), worked as a project engineer at Babcock Power Ltd (UK) prior to NUS. A registered PEng, a CEng(UK), MIMechE and MIES, and associate editor of Heat Transfer Engineering Journal. Introduce research findings of book into teaching curricula of Air Cond and Thermal Design Systems. Reviewer to National Science Foundation (NSF) and Engineering & Physical Science Research Council (UK)(2001/2). Interview panel of PE Board, Sing.

Qualification
BSc(Hons.1), PhD (Strathclyde)

Research Interests
Thermodynamic models, Chiller rating, ab/adsorptio
NSTB funded: Multibed regen ad. chiller(keyword: regenerative chiller)
NEDO (Japan) Int'l Res. Fund: Devt Waste Heat driven adsorption chillers.

Publications
Book: COOL THERMO, by JM Gordon and KC Ng, CISP, 2000.,Patents: 1) 9804792-1 PCT SG/99/00136 Regenerative adsorpn chiller(98), 2) USPO 1781-0231P: An Electro-adsorpn chiller (01)., Journals: 1) Physical Review E, V.65(02), 056111 2) IJR:V.18(95):253-257., V.23(00):412-429 3) V.24(01):124-136, 3)IJHMT: V.38(95):807-818, V.45(02):609-618, 4)ATE: V.17(1997):263-276, V.20(00):1149-1159, 5)SE: V.37(87):173-182, V.68(00):23-31, 6)JAP: V.75(94):2769-2774, V.83(99):1831-1836, V.85(99):641-646, V.89(01):5151-5158.

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NG Kim Choon
Professor
+65-6516-2214
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Dr PALANI Balaya
Associate Professor

Faculty of Engineering, Block E3A, #04-23
National University of Singapore
7 Engineering Drive 1
SINGAPORE 117574

Contact : +65-6516-7644
Homepage: http://serve.me.nus.edu.sg/thermo/AESL/AESL.htm

Just after graduating (1987-1993) from the University of Hyderabad, India, in the area of Solid State Ionics, I joined at the Indian Institute of Science, Bangalore as a Research Associate (1994-1996) and worked on the thermal properties of insulating materials at low temperature. I later joined at the Inter University Consortium (Bhabha Atomic Research Centre campus) Mumbai, as a Scientist (1996-2001) and worked with neutron diffractometer to investigate the structure of amorphous materials. I was also a Visiting Fellow (2001) at the Madras University, Chennai, and involved in the investigation of transport properties of nanocrystalline materials. I then moved to the Max Planck Institute for Solid State Research, Stuttgart, Germany as a Guest Scientist (2001-2006) and worked with Prof. Joachim Maier and contributed in the areas of anomalous transport phenomenon at nano-size (mesoscopic phenomenon), energetics of nano-crystals and interfacial lithium storage. I joined as an Assistant Professor in the Faculty of Engineering, NUS in January 2007. My current research area is nano-ionics for energy systems specifically in the context of solar energy conversion as well as lithium batteries for energy storage.

Qualification
M.Phil., Ph.D.

Modules Taught
PC2230 Thermodynamics and Statistical Mechanics; ESP3401 Photovoltaics Devices and Systems; ESP3901 Major Deisgn Project ME6203 Mass Transport

Research Interests
o Excitonic solar cells
o Energy storage – Lithium batteries and supercapcitors
o Solid oxide fuel cells
o Electrical conduction in nanostructured materials
o Thermodynamic stability of nanomaterials



Publications
Selected publications

1) “6Li MAS NMR Investigation of Electrochemical Lithiation of RuO2: Evidence for an Interfacial Storage Mechanism”,
E. Bekaert, P. Balaya, S. Murugavel, J. Maier and M. Ménétrier”, Chemistry of
Materials, (in press, 2009 DOI: 10.1021/cm8028005).

2) “Storage Performance of LiFePO4 Nanoplates”,
K. Saravanan, M. V. Reddy, P. Balaya, H. Gong, B. V. R. Chowdari and J. J.
Vittal, Journal of Materials Chemistry, 19 (2009) 605.

3) “Size Effects and Nanomaterials for Energy Applications”,
P. Balaya, Perspective Review, Energy and Environmen. Sci., 1 (2008) 645.

4) “Ionic and electronic transport in single crystalline LiFePO4 grown by optical floating zone technique”
R. Amin, J. Maier, P. Balaya, D. P. Chen, and C. T. Lin, Solid State Ionics, 179
(2008) 1683.

5) “Enhanced interfacial lithium storage in nanocomposites of transition metals with LiF and Li2O: comparison of DFT calculations and experimental studies”,
Yu. F. Zhukovskii, E. A. Kotomin, P. Balaya, and J. Maier, Solid State Sciences, 10 (2008) 491.

6) “Enhanced potential of amorphous electrode materials: case study of RuO2” O. Delmer, P. Balaya, L. Kienzle, and J. Maier, Adv. Mater., 20 (2008) 501.

7) “Enhanced lithium storage in transition metal/lithium fluoride nanocomposites: Experiment and theory”
Yu. F. Zhukovskii, P. Balaya, M. Dollé, E. A. Kotomin, and J. Maier Phys. Rev. B, 76 (2007) 235414.

8) “Nanostructured Materials for Reversible Lithium Batteries”,
P. Balaya and J. Maier, Innovation, 7 (2007) 32 (cover story).

9) “Mesoscopic hole conduction in nanocrystalline SrTiO3: a detailed analysis by impedance spectroscopy”
P. Balaya, J. Jamnik, J. Fleig and J. Maier, J. Electrochem. Soc. 154 (2007) P69.

10) “Ionic and electronic transport in single crystalline LiFePO4: electrochemical AC and DC studies”
R. Amin, P. Balaya and J. Maier, Electrochem. Solid State Lett.. 10 (2007) A13.

11) “Synthesis of nanoporous crystallites with superior catalytic and capacitive activity via electrochemical lithiation”,
Y.-S. Hu, Y.-G. Guo, W. Sigle, S. Hore, P. Balaya and J. Maier, Nature Mater. 5
(2006) 713

12) “Synthesis and characterization of nanocrystalline SrTiO3”,
P. Balaya, M. Ahrens, L. Kienle, J. Maier, B. Rahmati, S.B. Lee, W. Sigle, A. Pashkin, C. Kuntscher and M. Dressel, J. Amer. Ceram. Soc. 89 (2006) 2804.

13) "Nano-ionics in the context of lithium batteries"
P. Balaya, A.J. Bhattacharyya, J. Jamnik, Yu. Zhukovskii, E. Kotomin and J.
Maier, J. Power Sources 159 (2006) 171.

14) "Mesoscopic electrical conduction in nanocrystalline SrTiO3",
P. Balaya, J. Jamnik J. Fleig and J. Maier, Appl. Phys. Lett. 88 (2006) 062109.

15) "Evidence for interfacial storage anomaly in nanocomposites for lithium batteries by first principles simulation",
Yu. Zhukovskii, P. Balaya, E. Kotomin, J. Maier, Phys. Rev. Lett. 95 (2006) 058302 (1-4) (Selected for publication in the February 20, 2006 issue of the Virtual Journal of Nanoscale Science & Technology, a weekly multi-journal compilation of the latest research on nanoscale systems).

16) "Non-Debye conductivity relaxation in a mixed glassformer system"
P. Balaya and P.S. Goyal, J. Non-Crys. Solids 351 (2005) 1573

17) "Li-storage via heterogeneous reaction in selected binary metal fluorides and oxides“,
H. Li, P. Balaya and J. Maier, J. Electrochem. Soc., 151 (2004) A1878

18) "Dielectric and conductivity studies on lead silicate glasses having mixed alkali and alkaline earth metal oxides",
P. Balaya, V.K. Shrikhande, G.P. Kothiyal, and P.S. Goyal, Current Science 86 (2004) 553

19) "Fully reversible homogeneous and heterogeneous Li-storage in RuO2 with high capacity"
P. Balaya, H. Li, L. Kienle and J. Maier, Adv. Funct. Mater. 13 (2003) 621.

20) "Grain size effect on the universality of AC conductivity in SnO2"
A.C. Bose, P. Balaya, P. Thangadurai and S. Ramansamy, J. Phys. Chem. Solids 64 (2003)659

21) “Effect of Cu-substitution on the conductivity of Ag-rich AgI-CuI solid solutions”,
P.S. Kumar, P. Balaya, P.S. Goyal and C.S. Sunandana, J. Phys. Chem. Solids 64 (2003) 961

22) “Electrical conductivity and dielectric behaviour of nanocrystalline NiFe2O4 spinel”.
N. Ponpandian, P. Balaya and A. Narayanasamy, J. Phys-Condens. Mat. 14 (2002) 3221

23) “Dielectric properties of 1 MeV electron-irradiated polyimide”,
P.S. Alegaonkar, V.N. Bhoraskar, P. Balaya and P.S. Goyal, Appl. Phys. Lett. 80 (2002)640


Opening positions
One Research Fellow position is available in the area of lithium-ion batteries for microdevices. Those having a strong background of synthesis of mesoporous/nanostructured materials, are encouraged to contact Palani Balaya along with their detailed C.V.

Upcoming events:
Symposium-F on “Nanostructured Materials for Electrochemical Energy Systems: Lithium Batteries, Supercapacitors and Fuel Cells” during ICMAT-2009, 28th June – 3rd July 2009 http://www.mrs.org.sg/icmat2009/symposia/sym-f/default.htm


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PALANI Balaya
Associate Professor
+65-6516-7644
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Dr PARK, Sung-Yong
Assistant Professor

National University of Singapore
Dept. of Mechanical Engineering
Block E2, #02-19, Singapore 117576

Contact : +65-6601-3405
Homepage: http://serve.me.nus.edu.sg/MOFES/index.html

Dr. Sung-Yong Park is an assistant professor in the Department of Mechanical Engineering at National University of Singapore (NUS). Before joining NUS, he was a research scientist at Teledyne Scientific Company (formerly known as Rockwell Science Center) where he served as the PI and Co-PI of several R&D projects funded by ARPA-E, NASA, and Rockwell Automation. He received his Ph.D. degree from the University of California at Los Angeles (UCLA) in 2010 and was further trained as a post-doctoral researcher in the Optofluidic Systems Laboratory at UCLA.

His research interests include micro/opto/nanofluidics, renewable energy systems, biophotonics, micro-scale thermal-fluidic management, and Lab on a chip. He is the author and the co-author of more than 25 peer-reviewed technical papers on these topics. Not only were his optofluidic-related researches highlighted in several prestigious journals such as Nature Photonics and Lab on a Chip, but one of his publications was also selected for the cover paper of Lab on a Chip in 2010. Dr. Park was awarded the 2010 Harry M. Showman Prize, which is given to the very only outstanding graduate student who has the best academic and research achievements from UCLA's Henry Samueli School of Engineering and Applied Science in 2010. He is also the recipient of the Graduate Student Researcher Scholarship from the Mechanical Engineering Department at UCLA in 2006.

Qualification
Ph.D. University of California at Los Angeles (UCLA)

Modules Taught
ME3122 L2 Forced Convection Heat Transfer

Research Interests
Micro/Opto/Nanofluidics, Renewable Energy Systems, Biophotonics, Micro-scale thermal-fluidic control, Lab on a Chip

Publications
1. J. Cheng, S.-Y. Park, and C.-L. Chen, "Optofluidic Solar Concentrators using Electrowetting Tracking: Concept, Design, and Characterization," Solar Energy, 89, 152-161, 2013

2. T.-H. Wu, Y. Chen, S.-Y. Park, J. Hong, T. Teslaa, J. Zhong, D. Carlo, M. Teitell and P.-Y. Chiou "Pulsed Laser Triggered High Speed Microfluidic Fluorescence Activated Cell Sorter," Lab on a Chip, 12, 1378-1383, 2012 (Research highlight in Nature Photonics, May. 02, 2012)

3. S.-Y. Park and P.-Y. Chiou, "Review Article: Light-driven Droplet Manipulation Technologies for Lab-on-a-Chip Applications," Advances in OptoElectronics, Vol. 2011, Article ID: 909174, 2011, (Special issue, Optofluidics for Lab on a Chip)

4. S.-Y. Park, T.-H. Wu, Y. Chen, M. Teitell, and P.-Y. Chiou, "High-Speed Droplet Generation on Demand Driven by Pulse Laser-Induced Cavitation," Lab on a Chip, 2011, 11, 1010-1012, (Article selected as a Lab on a Chip HOT Articles, Mar. 03, 2011)

5. S.-Y. Park, M. Teitell, and P.-Y. Chiou, "Single-sided Continuous Optoelectrowetting (SCOEW) for Droplet Manipulation with Light Patterns," Lab on a Chip, 10, 1655-1661, 2010, (Article selected for the COVER PAPER of Lab on a Chip Issue 13, 2010)

6. S.-Y. Park, S. Kalim, C. Callahan, M. Teitell, and P.-Y. Chiou, "A Light-Induced Dielectrophorectic Droplet Manipulation Platform," Lab on a Chip, 9, 3228 - 3235, 2009

7. P.-Y. Chiou, S.-Y. Park, and M. C. Wu, "Continuous Optoelectrowetting for Picoliter Droplet Manipulation," Applied Physics Letters, 93, 221110, 2008, (Research highlights in Nature Photonics, Feb. 2009, Vol. 3, pp. 72)

8. S.-Y. Park, C. Pan, T.-H. Wu, C. Kloss, S. Kalim, C. Callahan, M. Teitell, and P.-Y. Chiou, "Floating Electrode Optoelectronic Tweezers (FEOET): Light-Driven Droplet Manipulation in Electrically Insulating Oil Medium," Applied Physics Letters, 92, 151101, 2008, (Research highlights in Nature Photonics, June. 2008)

9. X. Zhu, M. Minor, and S.-Y. Park, "Distributed Robust Control of Compliant Framed wheeled Modular Mobile Robots," Journal of Dynamic Systems, Measurement, and Control, 128, 489-498, 2006


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PARK, Sung-Yong
Assistant Professor
+65-6601-3405
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Dr PS Lee
Assistant Professor

E2, #02-07
Department of Mechanical Engineering
National University of Singapore
9 Engineering Drive 1
Singapore 117576
Contact : +65-6516-4187
Fax : +65-6779-1459
Homepage: http://serve.me.nus.edu.sg/MTS

Dr PS Lee obtained his BEng (1st Class Honors) and MEng from the Department of Mechanical Engineering at the National University of Singapore and was a Senior Tutor with the same department from 1999 to 2001. He then proceeded to obtain his PhD degree from the School of Mechanical Engineering, Purdue University, West Lafayette, USA in 2007. His current research interests include microfluidics and microscale heat transfer, high performance thermal management techniques (in particular microchannel single- and two-phase cooling) and hybrid solar energy harvesting systems. His work were published in top international journals and widely cited. One of his papers won the International Journal of Heat and Mass Transfer Most Cited Papers Award for 2005-2008. In addition, he developed various novel and effective passive techniques for enhancing the heat transfer performance of microchannel heat sinks and mitigating the critical issues of hotspots and large temperature gradients in electronics devices and holds 2 US patents related to these efforts. He is also the recipient of various awards including the 2009 Tan Kah Kee Young Inventors Award, 2011 Asia Pacific Clean Energy Summit Top 10 Defense Energy Technology Solutions Award and the 2011 Institution of Engineers Singapore (IES) Prestigious Engineering Achievement Award.

Qualification
PhD Purdue, MEng NUS, BEng NUS

Modules Taught
ME3122 Heat Transfer; ME5201 Thermal System Design; ME6204 Convective Heat Transfer

Research Interests
- Microfluidics
- Microscale heat transfer
- Advanced thermal management techniques in particular enhanced single and two-phase micro/mini-channel cooling
- Energy efficient HVAC systems
- Clean/renewable energy in particular hybrid solar energy harvesting systems and internal combustion engine fueled by biofuels and fuel blends


Publications
Selected
  1. Mai, T.T., Lai, C.Q., Zheng, H., Balasubramanian, K., Leong, K.C., Lee, P.S., Lee, C., Choi, W.K., Dynamics of wicking in silicon nanopillars fabricated with interference lithography and metal-assisted chemical etching, (2012) Langmuir, 28 (31), pp. 11465-11471.
  2. Fahd, M.E.A., Wenming, Y., Lee, P.S., Chou, S.K., Yap, C.R., Experimental investigation of the performance and emission characteristics of direct injection diesel engine by water emulsion diesel under varying engine load condition, (2012) Applied Energy, Article in Press.
  3. Alam, T., Lee, P.S., Yap, C.R., Jin, L., Balasubramanian, K., Experimental investigation and flow visualization to determine the optimum dimension range of microgap heat sinks, (2012) International Journal of Heat and Mass Transfer, Article in Press.
  4. Lee, Y.J., Lee, P.S., Chou, S.K., Enhanced thermal transport in microchannel using oblique fins, (2012) Journal of Heat Transfer, 134 (10), art. no. 101901.
  5. Alam, T., Lee, P.S., Yap, C.R., Jin, L., Experimental investigation of local flow boiling heat transfer and pressure drop characteristics in microgap channel, (2012) International Journal of Multiphase Flow, 42, pp. 164-174.
  6. Teo, H.G., Lee, P.S., Hawlader, M.N.A., An active cooling system for photovoltaic modules
  7. (2012) Applied Energy, 90 (1), pp. 309-315.
  8. Sui, Y., Teo, C.J., Lee, P.S., Direct numerical simulation of fluid flow and heat transfer in periodic wavy channels with rectangular cross-sections, (2012) International Journal of Heat and Mass Transfer, 55 (1-3), pp. 73-88.
  9. Sui, Y., Lee, P.S., Teo, C.J., An experimental study of flow friction and heat transfer in wavy microchannels with rectangular cross section, (2011) International Journal of Thermal Sciences, 50 (12), pp. 2473-2482.
  10. Balasubramanian, K., Lee, P.S., Jin, L.W., Chou, S.K., Teo, C.J., Gao, S., Experimental investigations of flow boiling heat transfer and pressure drop in straight and expanding microchannels - A comparative study, (2011) International Journal of Thermal Sciences, 50 (12), pp. 2413-2421.
  11. Sui, Y., Teo, C.J., Lee, P.S., Chew, Y.T., Shu, C., Fluid flow and heat transfer in wavy microchannels, (2010) International Journal of Heat and Mass Transfer, 53 (13-14), pp. 2760-2772.
  12. Jones, B.J., Lee, P.-S., Garimella, S.V., Infrared micro-particle image velocimetry measurements and predictions of flow distribution in a microchannel heat sink, (2008) International Journal of Heat and Mass Transfer, 51 (7-8), pp. 1877-1887.
  13. Lee, P.-S., Garimella, S.V., Saturated flow boiling heat transfer and pressure drop in silicon microchannel arrays, (2008) International Journal of Heat and Mass Transfer, 51 (3-4), pp. 789-806.
  14. Lee, P.-S., Garimella, S.V., Thermally developing flow and heat transfer in rectangular microchannels of different aspect ratios, (2006) International Journal of Heat and Mass Transfer, 49 (17-18), pp. 3060-3067.
  15. Liu, D., Lee, P.-S., Garimella, S.V., Prediction of the onset of nucleate boiling in microchannel flow, (2005) International Journal of Heat and Mass Transfer, 48 (25-26), pp. 5134-5149.
  16. Liu, D., Lee, P.-S., Garimella, S.V., Nucleate boiling in microchannels, (2005) Journal of Heat Transfer, 127 (8), p. 803.
  17. Lee, P.-S., Garimella, S.V., Liu, D., Investigation of heat transfer in rectangular microchannels, (2005) International Journal of Heat and Mass Transfer, 48 (9), pp. 1688-1704.


Patents
  1. Lee, P. -S. and Chang, S. C., 2005. "Method for the mitigation of hot spots in integrated circuits", United States Patent Application Number 11/198683, European Patent Application Number 06076370.3-1235 (Multi-countries).
  2. Lee, P. -S. and Garimella, S. V., 2007. "Hot-spot thermal management with flow modulation in a microchannel heat sink", United States Patent 7,277,284, European Patent Application (Germany).
  3. Lee, P. -S., 2008, Submitted an Invention Disclosure to enhance the heat transfer performance of microchannel heat sinks.


Recent Awards
  1. 2011 Institution of Engineers Singapore (IES) Prestigious Engineering Achievement Award
  2. 2011 Asia Pacific Clean Energy Summit Top 10 Defense Energy Solutions Award
  3. 2009 Tan Kah Kee Young Inventors Award - Defense Science (http://www.tkk.wspc.com.sg/tkk/data/awards/2009/D090550.pdf)
  4. International Journal Heat and Mass Transfer Most Cited Articles Award 2005-2008 (http://www.elsevier.com/wps/find/P08.cws_home/ijhmt_topcited - Investigation of heat transfer in rectangular microchannels, P.-S. Lee, S.V. Garimella, D. Liu, Volume 48, Issue 9 (2005), Pages 1688-1704)


OPENINGS AVAILABLE for PhD Students interested in pursuing research in
- Microfluidics
- Microscale heat transfer
- Advanced thermal management techniques
- Energy efficient HVAC systems
- Clean/renewable energy in particular hybrid solar energy harvesting systems
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PS Lee
Assistant Professor
+65-6516-4187
Fax : +65-6779-1459
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Dr Yang Wenming
Assistant Professor

EA-05-05, 9 Engineering Drive 1, Singapore 117576
Contact : +65-6516-6481
Homepage: http://serve.me.nus.edu.sg/energy/YangW.htm

After obtaining his Ph.D degree on Energy and Dynamic engineering from Jiangsu University of Science and Technology in 2000, he has been employed as a research fellow in the Department of Mechanical Engineering, National University of Singapore, followed by a teaching instructor in 2006. Since Jan.1,2011, He has been employed as an assistant professor in National University of Singapore. His research interests include: Internal combustion engine fueled by biofuels and blend fuels, fuel cell, solar cells, photovoltaic cells and micro power generators, cogeneration of biomass etc. He is now teaching two modules: Energy Conversion Process (ME3221) and Internal Combustion Engine (ME4227). He is now looking for Ph.D. candidates with interests in IC engines, micro power generators, air conditioning systems.

Qualification
Ph.D.

Modules Taught
ME4227:Internal Combustion Engines ME3221:Energy Conversion Processes

Research Interests
Internal combustion engines fueled by biofuels/emulsions fuels
Micro thermophotovoltaic power generators
Micro direct methanol fuel cells
PV cells
Air conditioning systems

Publications
[1] Yang WM, Chou, SK, Chua, Pan JF, Li J, Zhao X, Comparison of cylindrical and modular micro combustor-radiator for micro-TPV system application, Journal of Micromechanics and Microengineering 20, (2010) 085003-1-8.
[2] Yang WM, Chou SK, Shu C, Effect of current-collector structure on performance of passive micro direct methanol fuel cell, Journal of power sources 164, (2007) 549-554.
[3] Yang WM, Chou SK, Shu C, Li ZW, Xue H, A prototype microthermophotovoltaic power generator, Applied Physics Letters 84, (2004) 3864-3866.
[4] Yang, WM, Chou SK, Shu C, Li ZW, Xue H, Research on micro thermophotovoltaic power generators, Solar Energy Materials and solar cells 80, (2003) 95-104.
[5] Yang WM, Chou SK, Shu C, Xue H, and Li ZW, Development of a micro thermophotovoltaic system, Applied Physics Letters 81, (2002) 5255-5257.
[6] Yang WM, Li DT, Analysis on some factors affecting cold starting performance of swirl chamber diesel engine, Journal of Combustion Science and Technology 5, (1999) 345-348.

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Yang Wenming
Assistant Professor
+65-6516-6481
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Dr YAP Christopher
Associate Professor

National University of Singapore
Dept. of Mechanical Engineering
Contact : +65-6516-2271
Homepage: http://serve.me.nus.edu.sg/cyap/prf-cy.htm

As a Colombo Plan scholar, Dr Yap obtained his BESc with Deans honours in 1975 from the University of Western Ontario, Canada. Under an NUS post-graduate scholarship, he obtained his MEng from NUS in 1982 and his PhD from the University of Manchester Institute of Science and Technology, UK in 1987. He then joined the department as a faculty member. Before his graduate studies, Dr Yap had also worked for almost 3 years as a mechanical engineer in the Port of Singapore Authority (PSA).

Qualification
PhD Manc, MEng NUS, BESc W Ont, MASME, MSAE, MIES

Modules Taught
ME2121/ME2121E Thermodynamics, ME4223/ME4223E Thermal Environmental Engineering, ME5205 Energy Engineering

Research Interests
Numerical thermal-fluids, Energy efficiency



Publications
[1] Baughn, J.W., M.A. Hoffman, B.E. Launder, D. Lee and C.R. Yap (1989), ASME Journal of Heat Transfer, 111, 870-876.
[2] Chou, S.K. W.L. Chang, Y.W. Wong & C. Yap (1994), Energy Conversion and Management, 35(9), 751-763.
[3] Chua, H.T., K.C. Ng, X.C. Xuan, C. Yap and J.M. Gordon (2002), Physical Review E, Vol 65, No. 5, art. no. 056111, Part 2.

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YAP Christopher
Associate Professor
+65-6516-2271
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Professorial/Associate Professorial Fellows

 
Dr HO Juay Choy
Associate Professorial Fellow

National University of Singapore
Dept. of Mechanical Engineering
Singapore 119260
Contact : +65-6516-2552



Qualification
PhD (Wisc)

Research Interests
Energy Technologies





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HO Juay Choy
Associate Professorial Fellow
+65-6516-2552
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Dr TAY Andrew A. O.
Professorial Fellow

National University of Singapore
Dept. of Mechanical Engineering
Contact : +65-6516-2207

Professor Andrew Tay is a member of the Editorial Board of Microelectronics Journal and a member of the international advisory committees of numerous international conferences. He was an Associate Editor, ASME Journal of Electronic Packaging and the General Chairman of the 1st and 2nd IEEE Electronic Packaging Technology Conference, Singapore. He was awarded an IEEE Third Millennium Medal for outstanding contributions to CPMT Society.

Qualification
B.E. (Hons I) UNSW, PhD UNSW

Research Interests
Elec. Packaging. Fracture. Heat Transfer. MEMS.
Delimination. Solder joint reliability. Moisture effects. Electronics cooling.


Publications
AAO Tay et al, Predicting delam in plastic IC packages. IEEE Trans CPMT Pt B,17, n2(1994):201-208
Thermal analysis of IC packages & PCBs. J of Elec Mfg, 4(1994):223-230
Wirebond deformation during molding. ASME Trans, J of Elec Packaging, 117(1995):14-19
Influence of temp. humidity and defect location on delamination in packages. IEEE Trans on CPMT Pt A,22, 4(1999):512-518
Effect of delamination on the thermal fatigue of solder joints in flip chips. Proc. 7th ITHERM Conf, (2000):200-207


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TAY Andrew A. O.
Professorial Fellow
+65-6516-2207
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