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Research Papers

Experimental Study of a Single Microchannel Flow Under Nonuniform Heat Flux

[+] Author and Article Information
Ahmed Eltaweel

Mechanical Engineering Department,
Texas A&M University at Qatar,
P.O. Box 23874 Doha 23874, Qatar

Ibrahim Hassan

Mechanical Engineering Department,
Texas A&M University at Qatar,
P.O. Box 23874 Doha 23874, Qatar
e-mail: Ibrahim.hassan@qatar.tamu.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received September 17, 2018; final manuscript received November 24, 2018; published online June 6, 2019. Assoc. Editor: Ziad Saghir.

J. Thermal Sci. Eng. Appl 12(1), 011004 (Jun 06, 2019) (7 pages) Paper No: TSEA-18-1449; doi: 10.1115/1.4042153 History: Received September 17, 2018

Nonuniform heat fluxes are commonly observed in thermo-electronic devices that require distinct thermal management strategies for effective heat dissipation and robust performance. The limited research available on nonuniform heat fluxes focus mostly on microchannel heat sinks while the fundamental component, i.e., a single microchannel, has received restricted attention. In this work, an experimental setup for the analysis of variable axial heat flux is used to study the heat transfer in a single microchannel with fully developed flow under the effect of different heat flux profiles. Initially, a hot spot at different locations, with a uniform background heat flux, is studied at different Reynolds numbers, while varying the maximum heat fluxes in order to compute the heat transfer in relation to its dependent variables. Measurements of temperature, pressure, and flow rates at a different locations and magnitudes of hot spot heat fluxes are presented, followed by a detailed analysis of heat transfer characteristics of a single microchannel under nonuniform heating. Results showed that upstream hotspots have lower tube temperatures compared to downstream ones with equal amounts of heat fluxes. This finding can be of importance in enhancing microchannel heat sinks effectiveness in reducing maximum wall temperatures for the same amount of heat released, by redistributing spatially fluxes in a descending profile.

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Figures

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Fig. 1

Schematic of a test facility flow loop

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Fig. 2

The experimental test setup: (a) schematic of the test section design and (b) overview of the experimental setup

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Fig. 3

Experimental and computed bulk temperatures

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Fig. 4

Maximum outer wall temperature variation with Reynolds number

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Fig. 5

Bulk temperature rise variation with Reynolds number

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Fig. 6

Upstream hotspot temperature variation with Reynolds number

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Fig. 7

Local variation of outer wall and flow bulk temperatures

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Fig. 8

Streamwise Nusselt number for laminar flow: (a) upstream hotspot, (b) midstream hotspot, and (c) downstream hotspot

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