Performance Evaluation of Heat Sink For Electronic Cooling Using (H2O &Al2O3-H2O) as a Coolant

Abstract

Mini channel heat exchangers have become successful in applications such as electronics micro-electromechanical devices and other devices where small size objects are to be cooled, reason due to possibilities of reducing weight, size and cost of heat exchangers as compared to the conventional methods. Due to high volume to surface ratio, mini channel heat exchangers are thermally efficient devices and can transfer more heat. Accurate design for pressure drop and heat transfer is necessary for the application of mini-channel heat exchanger. This dissertation aims to study the fundamentals of single phase and double phase heat transfer and pressure drop in mini channels using water and Al2O3-Water nanofluids at different flow rates and different concentrations of nano particles. Results of heat sink will also be validated with the use of Computational Fluid Dynamics. To increase thermal efficiency for better cooling and also for reducing the size of electronics. Experiments were done on the mini channel with dimensions 2.7 mm depth and 2.95 mm width which was made on the aluminum heat sink. A flat plate heater was used as a heat source and was attached to the bottom of the aluminium heat sink. Temperature at the inlet and outlet of the sink was measured and analyzed at different flow rates for a two phase flow using water and nano fluids containing aluminium oxide (Al2O3) at different concentrations. pressure drop was also measured simultaneously. effect of reynolds number on pressure drop, friction factor, fanning friction factor and temperature change was studied. due to effective heat transfer, mini channel heat exchanger can be used for cooling purpose in electronics.