Entropy generation in mixed convection magnetohydrodynamic nanofluid flow in vertical channel

Cha'O Kuang Chen, Bo Shiuan Chen, Chin-Chia Liu

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

A numerical investigation is performed into the heat transfer performance and entropy generation characteristics of a mixed convection magnetohydrodynamic (MHD) flow of Al2O3-water nanofluid in a vertical asymmetrically-heated parallel-plate channel subject to viscous dissipation effects. In performing the analysis, the effects of the Lorentz force and Joule heating are modeled using the transverse momentum balance equation and energy balance equation, respectively. Moreover, the Hartmann number is assigned a value of Hm=0 (no magnetic field) or Hm=2 (weak magnetic field). The results show that the presence of the magnetic field increases the local Nusselt number at the hot wall. Moreover, the enhancement in the heat transfer performance increases with an increasing nanoparticle concentration. The local Nusselt number at the cold wall also increases with an increasing nanoparticle concentration. However, for a constant particle concentration, the Nusselt number reduces given the application of a magnetic field. Finally, the average entropy generation number also reduces when a magnetic field is applied.

Original languageEnglish
Pages (from-to)1026-1033
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Volume91
DOIs
Publication statusPublished - 2015 Dec 2

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Mixed convection
magnetohydrodynamic flow
Magnetohydrodynamics
convection
Entropy
entropy
Magnetic fields
Nusselt number
magnetic fields
heat transfer
Nanoparticles
Heat transfer
Hartmann number
cold walls
Lorentz force
nanoparticles
Joule heating
Flow of water
Energy balance
parallel plates

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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abstract = "A numerical investigation is performed into the heat transfer performance and entropy generation characteristics of a mixed convection magnetohydrodynamic (MHD) flow of Al2O3-water nanofluid in a vertical asymmetrically-heated parallel-plate channel subject to viscous dissipation effects. In performing the analysis, the effects of the Lorentz force and Joule heating are modeled using the transverse momentum balance equation and energy balance equation, respectively. Moreover, the Hartmann number is assigned a value of Hm=0 (no magnetic field) or Hm=2 (weak magnetic field). The results show that the presence of the magnetic field increases the local Nusselt number at the hot wall. Moreover, the enhancement in the heat transfer performance increases with an increasing nanoparticle concentration. The local Nusselt number at the cold wall also increases with an increasing nanoparticle concentration. However, for a constant particle concentration, the Nusselt number reduces given the application of a magnetic field. Finally, the average entropy generation number also reduces when a magnetic field is applied.",
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Entropy generation in mixed convection magnetohydrodynamic nanofluid flow in vertical channel. / Chen, Cha'O Kuang; Chen, Bo Shiuan; Liu, Chin-Chia.

In: International Journal of Heat and Mass Transfer, Vol. 91, 02.12.2015, p. 1026-1033.

Research output: Contribution to journalArticle

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AB - A numerical investigation is performed into the heat transfer performance and entropy generation characteristics of a mixed convection magnetohydrodynamic (MHD) flow of Al2O3-water nanofluid in a vertical asymmetrically-heated parallel-plate channel subject to viscous dissipation effects. In performing the analysis, the effects of the Lorentz force and Joule heating are modeled using the transverse momentum balance equation and energy balance equation, respectively. Moreover, the Hartmann number is assigned a value of Hm=0 (no magnetic field) or Hm=2 (weak magnetic field). The results show that the presence of the magnetic field increases the local Nusselt number at the hot wall. Moreover, the enhancement in the heat transfer performance increases with an increasing nanoparticle concentration. The local Nusselt number at the cold wall also increases with an increasing nanoparticle concentration. However, for a constant particle concentration, the Nusselt number reduces given the application of a magnetic field. Finally, the average entropy generation number also reduces when a magnetic field is applied.

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