Comparison of cooling performance in a microchannel with discrete heat sources under pressure gradient and electroosmotic driven

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Abstract

Electronic devices and advanced equipments have various sections that generated heat is a common feature among them, and sometimes it becomes so intense that it requires the design of a new structure to help cool them. However, the challenge becomes more complex when the device is in micro or nano size, where ordinary pumps with electrical components cannot function. This study addresses this issue using electroosmotic micro-pumps and examines the effect of microchannel angle and gravity on heat transfer rate. The microchannel angle ranges from 0 to 75 degrees, and the Grashof number varies between 0 and 100. For better understanding, the results obtained from a pressure-driven flow are compared with those from a purely electroosmotic flow while maintaining a constant flow rate. Thermal performance index is employed to measure the efficiency of flow patterns in both cases. The calculated variations range from approximately 11% to over 44%, indicating that two factors, increasing the microchannel angle relative to the horizontal plane and decreasing the Grashof number, exhibit similar behavior and enhance the heat transfer efficiency.

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Journal of Solid and Fluid Mechanics
Volume 14, Issue 3
September and October 2024
Pages 1-10

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