Viscous dissipation effect on entropy generation for non-Newtonian fluids in microchannels

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Abstract

An analytical study on the viscous dissipation effect on entropy generation in fully developed forced convection for single phase non-Newtonian fluid flow in circular microchannels is reported. In the first-law analysis, closed form solutions of the temperature distributions in the radial direction for the models with and without viscous dissipation term in the energy equation are obtained. In the second-law analysis, the two models are compared by analyzing their relative deviations in dimensionless entropy generation and Bejan number for different Brinkman number and power-law index. The findings show that under certain conditions the viscous dissipation effect on entropy generation in microchannels is significant and should not be neglected.

Original languageEnglish
Pages (from-to)1125-1129
Number of pages5
JournalInternational Communications in Heat and Mass Transfer
Volume35
Issue number9
DOIs
Publication statusPublished - Nov 2008
Externally publishedYes

Keywords

  • Brinkman number
  • Entropy generation
  • Non-Newtonian fluid
  • Viscous dissipation

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