Effects of nanoparticle migration and asymmetric heating on magnetohydrodynamic forced convection of alumina/water nanofluid in microchannels

A. Malvandi, D. D. Ganji

Research output: Contribution to journalArticlepeer-review

Abstract

The present paper is a theoretical investigation on effects of nanoparticle migration and asymmetric heating on forced convective heat transfer of alumina/water nanofluid in microchannels in presence of a uniform magnetic field. Walls are subjected to different heat fluxes; qt″ for top wall and qb″ for bottom wall, and because of non-adherence of the fluid-solid interface due to the microscopic roughness in microchannels, Navier's slip boundary condition is considered at the surfaces. A two-component heterogeneous mixture model is used for nanofluid with the hypothesis that Brownian motion and thermophoretic diffusivities are the only significant slip mechanisms between solid and liquid phases. Assuming a fully developed flow and heat transfer, the basic partial differential equations including continuity, momentum, and energy equations have been reduced to two-point ordinary boundary value differential equations and solved numerically. It is revealed that nanoparticles eject themselves from heated walls, construct a depleted region, and accumulate in the core region, but more likely to accumulate near the wall with lower heat flux. Also, the non-uniform distribution of nanoparticles causes velocities to move toward the wall with a higher heat flux and enhances heat transfer rate there. In addition, inclusion of nanoparticles in a very strong magnetic field and slip velocity at the walls has a negative effect on performance.

Original languageEnglish (US)
Pages (from-to)169-184
Number of pages16
JournalEuropean Journal of Mechanics, B/Fluids
Volume52
DOIs
StatePublished - Jul 1 2015
Externally publishedYes

Keywords

  • Magnetic field
  • Microchannel
  • Modified Buongiorno's model
  • Nanofluid
  • Nanoparticles migration
  • Slip velocity

ASJC Scopus subject areas

  • Mathematical Physics
  • General Physics and Astronomy

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