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Title: Effect of channel and plenum aspect ratios on the performance of microchannel heat sink under different flow arrangements
Authors: Sehgal S.S.
Murugesan, Krishnan
Mohapatra S.K.
Published in: Journal of Mechanical Science and Technology
Abstract: Microchannels based heat sinks are considered as potential thermal management solution for electronic devices. The overall thermal performance of a microchannel heat sink depends on the flow characteristics within microchannels as well as within the inlet and outlet plenum and these flow phenomena are influenced by channel aspect ratio, plenum aspect ratio and flow arrangements at the inlet and outlet plenums. In the present research work an experimental investigation has been carried out to understand how the heat transfer and pressure drop attributes vary with different plenum aspect ratio and channel aspect ratio under different flow arrangements. For this purpose microchannel test pieces with two channel aspect ratios, 4. 72 and 7. 57 and three plenum aspect ratios, 2. 5, 3. 0 and 3. 75 have been tested under three flow arrangements, namely U-, S- and P-types. Test runs were performed by maintaining three constant heat inputs, 125 W, 225 W and 375 W in the range 224. 3 ≤ R e ≤ 1121. 7. Reduction in channel width (increase in aspect ratio, defined as depth to width of channel) in the present case has shown about 126 to 165% increase in Nusselt number, whereas increase in plenum length (reduction in plenum aspect ratio defined as width to length of plenum) has resulted in 18 to 26% increase in Nusselt number. © 2012 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.
Citation: Journal of Mechanical Science and Technology (2012), 26(9): 2985-2994
Issue Date: 2012
Keywords: Channel aspect ratio
Flow arrangements
Microchannel heat sink
Nusselt number
Plenum aspect ratio
Pressure drop
ISSN: 1738494X
Author Scopus IDs: 36160740400
Author Affiliations: Sehgal, S.S., Department of Mechanical and Automotive Engineering, Swift Institute of Engineering and Technology, Punjab, India
Murugesan, K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India
Mohapatra, S.K., Department of Mechanical Engineering, Thapar University, Punjab, India
Corresponding Author: Murugesan, K.; Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India; email:
Appears in Collections:Journal Publications [ME]

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