Doctor Honoris Causa (Lodz, Poland)
PhD, Fellow ASME,CIC,IIChE, IES
Tel : (65)6516-4623
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Mineral, Metal & Materials Technology Centre (M3TC)
H. J. Poo, K. Kumar, H. S. Chiang and A. S. Mujumdar, Heat transfer from a laminar impinging jet of a power law fluid, Int. Comm. Heat Mass Transfer, Vol. 31, No. 2, pp. 241-249, 2004.
L. Huang, K. Kumar and A.S. Mujumdar, Simulation of spray evaporation using pressure and ultrasonic atomizer- A comparative analysis, Russia TSTU Trans. (English version), 10 (1A), pp83-100, 2004.
X.-Q. Wang, C. Yap and A. S. Mujumdar, Effects of two-dimensional roughness in flow in microchannels, Journal of Electronic Packaging, 2004.
S. J. Wang and A.S. Mujumdar, A computation study of turbulent mixing in three-dimensional confined opposing jets, Ind.Eng.Chem.Res., 2004.
Z. Wu and A. S. Mujumdar, A parametric study of spray drying of a solution in a pulsating high temperature turbulent flow, Drying Technology, 2004.
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Research Areas and Activities
1. Simulation of Spray drying using CFD
Recent rapid development in CFD and the ever-increasing power of computers make it possible to simulate and evaluate the new spray dryer chamber designs as well as air inlet and outlet arrangements to improve the spray drying process. The expensive pilot experiments or laboratory tests can thus be minimized. (For More)
2. Multi-mode Heat pump Drying
Heat sensitive materials need to be dried at lower product temperatures to maintain their quality in terms of color, texture, nutritional value etc. In order to attain reasonable drying rates under such conditions to keep the capital costs of equipment low, heat pumps may be used. In order to make the heat pump drying process further cost-effective in terms of reduced energy costs and lower capital costs, this project aims at studying and modeling the drying process in which the material is subjected to time-varying heat inputs by convection, conduction, radiation etc. Microwave drying effects were also considered separately under low pressure conditions. Experimental results are compared favorably with simulations using a simple liquid diffusion model. Results are published in a series of paper in 2002-2004. (For More)
Heat and Mass Transfer
1. Micro-impinging Jet Heat Transfer
This research project is on numerical and experimental investigation of micro-impinging jet with single and two-phase heat transfer. In this project, the dimension of micro-impinging jet refers to about 0.1 mm. This particular study will be applied to electronic component cooling. Computational fluid dynamics model(CFD) using the commercial software Fluent and CFX is applied in the numerical simulation. (For More)
2. Pulse Combustion and its Applications to Drying
This project addresses the fundamental understanding of the pulse combustion process and pulse combustion drying with focus on the design of a new small scale-pulse combustion system and heat/mass transfers in selected pulse combustion drying processes. A modified CFD model based on commercial software is being developed to min imize expensive pilot experimentation and laboratory tests. (For More)
3. Explosive Boiling
Explosive (i.e. very rapid) boiling of a liquid at high degrees of superheats can generate large forces which can be successfully harnessed in developing novel thermal actuators with many potential engineering applications, e.g. displacement type micro-pump. Such devices have been shown to be suitable for specialized applications ranging from biology and medicine to space exploration and micro-electronic schooling, etc. Fluid volumes on the order of micro litres or less are figuring prominently in an increasing number of engineering applications. One well known successful application of this concept is the thermal inkjet printer head used in HP ink jet printers.
More On Current Research Activities: More Research (PDF) and http://serve.me.nus.edu.sg/arun/