MHD natural convection and entropy generation in a trapezoidal enclosure using Cu-water nanofluid

Amir Houshang Mahmoudi, Ioan Pop, Mina Shahi, Farhad Talebi

Research output: Contribution to journalArticleAcademicpeer-review

87 Citations (Scopus)

Abstract

The present work investigates the entropy generation and enhancement of heat transfer in natural convection flow and heat transfer using Copper (Cu)-water nanofluid in the presence of a constant magnetic field. The analysis uses a two dimensional trapezoidal enclosure with the left vertical wall and inclined walls kept in a low constant temperature and a heat source with constant heat flux placed on the bottom wall of the enclosure. The governing equations were discretized by the control volume method and solved numerically by SIMPLE algorithm. The computations were carried out for a wide range of the Rayleigh number (104 ≤ Ra ≤ 107), Hartman number (0 ≤ Ha ≤ 100) and solid volume fraction (0 ≤ φ ≤ 0.05). The results show that at Ra=104 and 105 the enhancement of the Nusselt number due to presence of nanoparticles increases with the Hartman number, but at higher Rayleigh number, a reduction has been observed. In addition it was observed that the entropy generation is decreased when the nanoparticles are present, while the magnetic field generally increases the magnitude of the entropy generation.

Original languageEnglish
Pages (from-to)46-62
Number of pages17
JournalComputers and fluids
Volume72
DOIs
Publication statusPublished - 5 Feb 2013

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Magnetohydrodynamics
Enclosures
Natural convection
Entropy
Magnetic fields
Nanoparticles
Heat transfer
Water
Nusselt number
Heat flux
Volume fraction
Copper
Temperature

Keywords

  • Entropy generation
  • MHD
  • Nanofluid
  • Natural convection
  • Numerical study
  • Trapezoidal enclosure

Cite this

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abstract = "The present work investigates the entropy generation and enhancement of heat transfer in natural convection flow and heat transfer using Copper (Cu)-water nanofluid in the presence of a constant magnetic field. The analysis uses a two dimensional trapezoidal enclosure with the left vertical wall and inclined walls kept in a low constant temperature and a heat source with constant heat flux placed on the bottom wall of the enclosure. The governing equations were discretized by the control volume method and solved numerically by SIMPLE algorithm. The computations were carried out for a wide range of the Rayleigh number (104 ≤ Ra ≤ 107), Hartman number (0 ≤ Ha ≤ 100) and solid volume fraction (0 ≤ φ ≤ 0.05). The results show that at Ra=104 and 105 the enhancement of the Nusselt number due to presence of nanoparticles increases with the Hartman number, but at higher Rayleigh number, a reduction has been observed. In addition it was observed that the entropy generation is decreased when the nanoparticles are present, while the magnetic field generally increases the magnitude of the entropy generation.",
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MHD natural convection and entropy generation in a trapezoidal enclosure using Cu-water nanofluid. / Mahmoudi, Amir Houshang; Pop, Ioan; Shahi, Mina; Talebi, Farhad.

In: Computers and fluids, Vol. 72, 05.02.2013, p. 46-62.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - MHD natural convection and entropy generation in a trapezoidal enclosure using Cu-water nanofluid

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AU - Pop, Ioan

AU - Shahi, Mina

AU - Talebi, Farhad

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N2 - The present work investigates the entropy generation and enhancement of heat transfer in natural convection flow and heat transfer using Copper (Cu)-water nanofluid in the presence of a constant magnetic field. The analysis uses a two dimensional trapezoidal enclosure with the left vertical wall and inclined walls kept in a low constant temperature and a heat source with constant heat flux placed on the bottom wall of the enclosure. The governing equations were discretized by the control volume method and solved numerically by SIMPLE algorithm. The computations were carried out for a wide range of the Rayleigh number (104 ≤ Ra ≤ 107), Hartman number (0 ≤ Ha ≤ 100) and solid volume fraction (0 ≤ φ ≤ 0.05). The results show that at Ra=104 and 105 the enhancement of the Nusselt number due to presence of nanoparticles increases with the Hartman number, but at higher Rayleigh number, a reduction has been observed. In addition it was observed that the entropy generation is decreased when the nanoparticles are present, while the magnetic field generally increases the magnitude of the entropy generation.

AB - The present work investigates the entropy generation and enhancement of heat transfer in natural convection flow and heat transfer using Copper (Cu)-water nanofluid in the presence of a constant magnetic field. The analysis uses a two dimensional trapezoidal enclosure with the left vertical wall and inclined walls kept in a low constant temperature and a heat source with constant heat flux placed on the bottom wall of the enclosure. The governing equations were discretized by the control volume method and solved numerically by SIMPLE algorithm. The computations were carried out for a wide range of the Rayleigh number (104 ≤ Ra ≤ 107), Hartman number (0 ≤ Ha ≤ 100) and solid volume fraction (0 ≤ φ ≤ 0.05). The results show that at Ra=104 and 105 the enhancement of the Nusselt number due to presence of nanoparticles increases with the Hartman number, but at higher Rayleigh number, a reduction has been observed. In addition it was observed that the entropy generation is decreased when the nanoparticles are present, while the magnetic field generally increases the magnitude of the entropy generation.

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