Microchannel heat sink with designed roughness

Analysis and optimization

Afzal Husain, Kwang Yong Kim

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

A microchannel heat sink with rib structures is investigated numerically for thermal resistance and pumping power. Multi-objective shape optimization of a staggered-rib microchannel heat sink is performed using a multiobjective evolutionary algorithm. Three design variables (Le., ratios of the rib height to width of channel, width to height of the rib, and channel width to pitch of the rib) are selected for optimization. Thermal resistance and pumping power are taken as objective functions. Navier-Stokes and energy equations for laminar flow and conjugate heat transfer are solved for flow analyses using a finite volume solver. Thermal resistance is decreased and the Nusselt number is increased at the expense of pressure drop in a ribbed microchannel. Thermal resistance in a ribbed channel is generally higher than that in a smooth channel for fixed pumping power, but the difference in thermal resistance reduces as pumping power increases. The design variable of the ratio of rib height to width of channel is primarily responsible for and the most sensitive to the heat transfer augmentation, whereas ratios of width to height of the rib and channel width to pitch of the rib are found to be less sensitive in the design space. The ratio of channel width to pitch of the rib is found to be the most Pareto-sensitive (sensitive along the Pareto-optimal front), whereas the ratio of width to height of the rib is found to be the least Pareto-sensitive.

Original languageEnglish
Pages (from-to)342-351
Number of pages10
JournalJournal of Thermophysics and Heat Transfer
Volume22
Issue number3
DOIs
Publication statusPublished - Jul 2008

Fingerprint

heat sinks
Heat sinks
microchannels
Microchannels
Heat resistance
roughness
Surface roughness
thermal resistance
optimization
pumping
Heat transfer
Shape optimization
Nusselt number
Laminar flow
Evolutionary algorithms
heat transfer
Pressure drop
shape optimization
pressure drop
laminar flow

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

Cite this

Microchannel heat sink with designed roughness : Analysis and optimization. / Husain, Afzal; Kim, Kwang Yong.

In: Journal of Thermophysics and Heat Transfer, Vol. 22, No. 3, 07.2008, p. 342-351.

Research output: Contribution to journalArticle

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