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Constructal design and thermal analysis of microchannel heat sinks with multistage bifurcations in single-phase liquid flow

Xie, Gongnan; Zhang, Fengli; Sundén, Bengt LU and Zhang, Weihong (2014) In Applied Thermal Engineering 62(2). p.791-802
Abstract
Based on constructal theory, five different cases with multistage bifurcations are designed as well as one case without bifurcations, and the corresponding laminar fluid flow and thermal performance have been investigated numerically. All laminar fluid flow and heat transfer results are obtained using computation fluid dynamics, and a uniform wall heat flux thermal boundary condition is applied all heated surfaces. The inlet velocity ranges from 0.66 m/s to 1.6 m/s with the corresponding Reynolds number ranging from 230 to 560. The pressure, velocity, temperature distributions and averaged Nusselt number are presented. The overall thermal resistances versus inlet Reynolds number or pumping power are evaluated and compared for the six... (More)
Based on constructal theory, five different cases with multistage bifurcations are designed as well as one case without bifurcations, and the corresponding laminar fluid flow and thermal performance have been investigated numerically. All laminar fluid flow and heat transfer results are obtained using computation fluid dynamics, and a uniform wall heat flux thermal boundary condition is applied all heated surfaces. The inlet velocity ranges from 0.66 m/s to 1.6 m/s with the corresponding Reynolds number ranging from 230 to 560. The pressure, velocity, temperature distributions and averaged Nusselt number are presented. The overall thermal resistances versus inlet Reynolds number or pumping power are evaluated and compared for the six microchannel heat sinks. Numerical results show that the thermal performance of the microchannel heat sink with multistage bifurcation flow is better than that of the corresponding straight microchannel heat sink. The heat sink with a long bifurcation length in the first stage (Case 1A) is superior. The usage of multistage bifurcated plates in microchannel heat sink can reduce the overall thermal resistance and make the temperature of the heated surface more uniform (Case 3). It is suggested that proper design of the multistage bifurcations could be employed to improve the overall thermal performance of microchannel heat sinks and the maximum number of stages of bifurcations is recommended to be two. The study complements and extends previous works. (C) 2013 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Microchannel heat sink, Multistage bifurcations, Thermal performance, Laminar flow, Numerical simulation
in
Applied Thermal Engineering
volume
62
issue
2
pages
791 - 802
publisher
Elsevier
external identifiers
  • wos:000330910700055
  • scopus:84896463662
ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2013.10.042
language
English
LU publication?
yes
id
78387222-83bf-4039-81c4-e822b07cd87a (old id 4376525)
date added to LUP
2014-04-14 13:07:53
date last changed
2017-11-12 03:06:12
@article{78387222-83bf-4039-81c4-e822b07cd87a,
  abstract     = {Based on constructal theory, five different cases with multistage bifurcations are designed as well as one case without bifurcations, and the corresponding laminar fluid flow and thermal performance have been investigated numerically. All laminar fluid flow and heat transfer results are obtained using computation fluid dynamics, and a uniform wall heat flux thermal boundary condition is applied all heated surfaces. The inlet velocity ranges from 0.66 m/s to 1.6 m/s with the corresponding Reynolds number ranging from 230 to 560. The pressure, velocity, temperature distributions and averaged Nusselt number are presented. The overall thermal resistances versus inlet Reynolds number or pumping power are evaluated and compared for the six microchannel heat sinks. Numerical results show that the thermal performance of the microchannel heat sink with multistage bifurcation flow is better than that of the corresponding straight microchannel heat sink. The heat sink with a long bifurcation length in the first stage (Case 1A) is superior. The usage of multistage bifurcated plates in microchannel heat sink can reduce the overall thermal resistance and make the temperature of the heated surface more uniform (Case 3). It is suggested that proper design of the multistage bifurcations could be employed to improve the overall thermal performance of microchannel heat sinks and the maximum number of stages of bifurcations is recommended to be two. The study complements and extends previous works. (C) 2013 Elsevier Ltd. All rights reserved.},
  author       = {Xie, Gongnan and Zhang, Fengli and Sundén, Bengt and Zhang, Weihong},
  issn         = {1359-4311},
  keyword      = {Microchannel heat sink,Multistage bifurcations,Thermal performance,Laminar flow,Numerical simulation},
  language     = {eng},
  number       = {2},
  pages        = {791--802},
  publisher    = {Elsevier},
  series       = {Applied Thermal Engineering},
  title        = {Constructal design and thermal analysis of microchannel heat sinks with multistage bifurcations in single-phase liquid flow},
  url          = {http://dx.doi.org/10.1016/j.applthermaleng.2013.10.042},
  volume       = {62},
  year         = {2014},
}