Pitch and aspect ratio effects on single-phase heat transfer through microscale pin fin heat sinks

Rasouli, Erfan; Naderi, Cameron; Narayanan, Vinod

doi:10.1016/j.ijheatmasstransfer.2017.10.105

Title: Pitch and aspect ratio effects on single-phase heat transfer through microscale pin fin heat sinks

Journal Article · Thu Nov 09 00:00:00 EST 2017 · International Journal of Heat and Mass Transfer

DOI:https://doi.org/10.1016/j.ijheatmasstransfer.2017.10.105· OSTI ID:1828578

^[1];

^[1]; Narayanan, Vinod ^[1]

Univ. of California, Davis, CA (United States)

Heat transfer and pressure drop of single-phase liquid flow is characterized in eight micro pin fin heat sinks with varied pitch and aspect ratios. The pins are diamond shaped with respect to the flow and have transverse pitch-to-diameter (S_T/D_h) and aspect (H_pin/D_h) ratio variations in the range of 1.7–3.0 and 0.7–3.2, respectively. The fluid used is PF-5060 over a Reynolds numbers (based on pin fin hydraulic diameter) range of 8–1189. Flow visualization is performed on all the heat sinks and flow transition into unsteady vortex shedding is observed only in those with specific pitch and aspect ratios. Flow visualization reveals upstream propagation of the onset of vortex shedding along the length of heat sink with an increase in Reynolds number. The existence of vortex shedding in micro pin fin heat sinks affects the prediction error of heat transfer correlations in literature. To address this gap, together with data from a prior study using liquid nitrogen, separate correlations are developed to predict Nu in the steady and unsteady regimes. Furthermore, the resulting correlation for the unsteady regime shows significantly decreased dependency of Nusselt on the Prandtl number compared to the non-vortex-shedding condition.

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Research Organization:: Univ. of California, Davis, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0007108; FE0024064

OSTI ID:: 1828578

Alternate ID(s):: OSTI ID: 1564475

Journal Information:: International Journal of Heat and Mass Transfer, Vol. 118; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 58 works

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Parametric Investigation on a Micro-Array Heat Sink with Staggered Trapezoidal Bumps Wang, Ruijin; Yuan, Weijia; Wang, Jiawei Micromachines, Vol. 10, Issue 12 https://doi.org/10.3390/mi10120845	journal	December 2019

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14 SOLAR ENERGY
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