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Research Papers: Micro/Nanoscale Heat Transfer

Laminar Heat Transfer Behavior of a Phase Change Material Fluid in Microchannels With Staggered Pins

[+] Author and Article Information
Satyanarayana Kondle

FireEye, Inc.,
12011 Sunset Hills Road Suite 400,
Reston, VA 20190
e-mail: satyam.iit@gmail.com

Jorge L. Alvarado

Mem. ASME
Department of Engineering Technology and
Industrial Distribution,
Texas A&M University,
College Station, TX 77843
e-mail: jorge.alvarado@tamu.edu

Charles Marsh

U.S. Army Corps of Engineers,
Engineer and Research Development Center,
Champaign, IL 61822
e-mail: Charles.P.Marsh@usace.army.mil

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 22, 2015; final manuscript received December 4, 2016; published online February 28, 2017. Assoc. Editor: Jim A. Liburdy.This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions.

J. Heat Transfer 139(6), 062401 (Feb 28, 2017) (8 pages) Paper No: HT-15-1217; doi: 10.1115/1.4035441 History: Received March 22, 2015; Revised December 04, 2016

Microchannels have been studied extensively for a variety of heat transfer applications including electronic cooling. Many configurations of microchannels have been studied and compared for their effectiveness in terms of heat removal. Recently, the use of staggered pins in microchannels has gained considerable traction, since they can promote internal flow fluctuations that enhance internal heat transfer. Furthermore, staggered pins in microchannels have shown higher heat removal characteristics because of the continuous breaking and formation of the heat transfer fluid boundary layer. However, they also exhibit higher pressure drop because the pins act as flow obstructions. This paper presents numerical results of two characteristic staggered 100-μm pins (square and circular) in microchannels. The heat transfer performance of a single phase fluid (SPF) in microchannels with staggered pins, and the corresponding pressure drop characteristics are presented. Furthermore, a phase change material (PCM, n-eicosane) fluid was also considered by implementing the effective specific heat capacity model approach to account for the corresponding phase change process of PCM fluid. Comparisons of the heat transfer characteristics of single phase fluid and PCM fluid are presented for two different pin geometries and three different Reynolds numbers. Circular pins were found to be more effective in terms of heat transfer by exhibiting higher Nusselt number. Microchannels with circular pins were also found to have lower pressure drop compared to the square-pin microchannels.

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Figures

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Fig. 1

(a) Diagram showing the geometry cross section and the portion modeled, (b) top view of the square pins’ configuration showing the section modeled in fluent, (c) microchannel with circular pins, and (d) fully developed velocity profile for 1:2 straight microchannel

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Fig. 2

Grid independence simulation results for square pins’ geometry under CWHF boundary condition using PCM fluid

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Fig. 3

Nusselt number variation for a circular channel under H2 boundary condition. Experimental results by Chen et al. [11].

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Fig. 4

(a) Nusselt number variation for square pins’ geometry under CWHF boundary condition using PCM fluid, (b) Nusselt number variation for circular pins’ geometry under CWHF boundary condition using PCM fluid, and (c) fluid temperature for CWHF boundary condition

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Fig. 5

(a) Nusselt number variation for square pins’ geometry under CWT boundary condition using PCM fluid and (b) Nusselt number variation for circular pins’ geometry under CWT boundary condition using PCM fluid

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Fig. 6

(a) Nusselt number variation for three geometries under CWHF boundary condition using SPF fluid and (b) Nusselt number variation for three geometries under CWHF boundary condition using PCM fluid

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Fig. 7

(a) Nusselt number variation for circular pins’ geometry under CWHF boundary condition using SPF fluid and (b) Nusselt number variation for square pins’ geometry under CWHF boundary condition using SPF fluid

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Fig. 8

(a) Nusselt number variation for circular pins’ geometry under CWHF boundary condition using PCM fluid and (b) Nusselt number variation for square pins’ geometry under CWHF boundary condition using PCM fluid

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Fig. 9

(a) Contours of velocity around square pins for Rep = 50 and (b) contours of velocity around circular pins for Rep = 50

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