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Numerical study of inlet cross section effect on oblique finned microchannel heat sink

The current study is focussed on the heat transfer and flow characteristics of an oblique finned microchannel heat sink with different inlet cross-sections. Water and Al2O3/water nanofluid with 0.25% volume fraction were used as heat transfer fluids. The oblique finned microchannel heat sinks of size 48x80mm were designed with three different inlet cross-sections namely square, semicircle and trapezoidal. The ANSYS FLUENT simulations validated with the aid of an existing experimental work. The flow regime in microchannel heat sink is constrained to laminar flow in the study. The three inlet cross-sections have been investigated by varying Reynolds number for Water and Al2O3/water nanofluid. The trapezoidal cross-section with average heat transfer rate 3.35% and pressure drop 8.6 % is more efficient than other cross-sections due to larger wall area and effective entrance length than other cross section. The oblique finned microchannel heat sink with the Trapezoidal cross section is suitable for the microelectronic cooling systems.
PAPER REVISED: 2017-05-23
PAPER ACCEPTED: 2017-05-28
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