Optimisation of porous slab parameters for jet-impingement microchannel heat sink performance enhancement

Jyoti Pandey, Mohd Zahid Ansari, Afzal Husain*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: Porous media can provide excellent performance in thermal energy transport applications. This study aims to optimise the square porous slabs (placed in the middle of the channel) parameters to enhance the cooling performance of the jet-impingement microchannel heat sink. Design/methodology/approach: Three levels of each design parameters, i.e. porous slab side, porous slab height, type of material, permeability and quadratic drag factor, are studied; and an L27 orthogonal array is adopted to generate the design points in the specified design space. Optimum designs of the porous media slabs are achieved to minimise the maximum-wall temperature, thermal resistance and pressure drop and maximise the average heat transfer coefficient and figure of merit (FOM). Findings: Results exhibited that the porous media material and permeability are the most, whereas drag factor is the least significant factors with respect to the overall performance of the heat sink. The optimum value of FOM for the proposed hybrid heat sink model belongs to the set of design variables, i.e. 0.4 mm slab side, 0.6 mm slab height, 5 × 10−11 m2 permeability, 0.21 drag factor and copper as substrate material. Originality/value: This study proposes a novel design and a hybrid approach to investigate and optimise the hydrothermal performance of jet impingements on porous slabs inserted in the microchannels.

Original languageEnglish
JournalInternational Journal of Numerical Methods for Heat and Fluid Flow
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • ANOVA
  • Ansys Fluent
  • Figure of merit
  • Jet impingement
  • Microchannel heat sink
  • Porous slabs
  • Taguchi optimisation
  • Thermal resistance

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Computer Science Applications
  • Applied Mathematics

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