Study on heat transfer and pressure drop characteristics of nanofluid flowing in heat exchanger

Mazlan, Muhammad Hadzim Ashraff (2022) Study on heat transfer and pressure drop characteristics of nanofluid flowing in heat exchanger. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Microchannel heat sinks (MCHS) are generally utilized as a part of electronic gadgets for cooling system. In this study, the pressure drop in straight microchannel heat sink (MCHS) is examined repectively, using different concentration (1%, 2%, 3%, 4%, and 5%) of WaterCuO nanofluids are used as working fluids. For this purpose, a computational fluid dynamics(CFD) evaluated the performance of the nanofluids through microchannel heat sink. The evaluated microchannel performance was shown in terms of pressure drops, temperature, velocity, surface Nusselt number, surface heat transfer coefficient contours. The thermophysical properties of nanofluid are evaluated to study its effect on the flow and heat transfer at a reference inlet velocity 2 m/s. The heat flux generated at the bottom surface of the microchannel used was 160000 (W/m2). The results show that increasing the temperature decreases the pressure drop. Generally, increasing the velocity rate results in a decrease in the pressure drop. The increased volume concentration of the nanofluid results in increased viscosity, which results in an increased pressure drop. Increases in fluid temperature directly affect viscosity, which results in a decrease in pressure drop. Overall, the comparison of all concentrations of Water-CuO nanofluids demonstrates unequivocally that Water-CuO 1% is the best for cooling because it exhibits the lowest pressure drops compared to the other nanofluids. This physical characteristics concentration of Water-CuO 1% can fully exploit the advantages of increasing flow velocity, enhancing heat transfer, and lowering pressure drop.

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