### Abstract

The effect of conductivity ratio on temperature at a solid-porous interface is one of the most important aspects in conjugate heat transfer. The present work is undertaken to investigate heat transfer behavior in a porous annular vertical cylinder having a solid wall at the inner surface. The main objective of the present study is to evaluate the effect of solid wall thickness and conductivity ratio on heat transfer characteristics of the porous medium. The inner and outer surfaces of the annulus are maintained isothermally at T_{h} and T∞, respectively, such that Th > T∞. The increase in conductivity ratio leads to an increase in temperature at the solid-porous interface. It is noticed that the temperature variation along the porous region is almost linear for higher values of conductivity ratio and wall thickness ratio. It is found that the fluid velocity decreases with increase in wall thickness. It is observed that the Nusselt number decreases with increase in solid wall thickness. The effect of the aspect ratio is found to be negligible when porous conductivity is much higher than that of the solid wall conductivity. The attainment of the maximum Nusselt number at Ar ≈ 1 in a porous annulus does not hold good for the conjugate heat transfer problem. The variation in Nusselt number is sensitive for higher wall thickness ratio and lower conductivity ratio.

Original language | English |
---|---|

Pages (from-to) | 1109-1119 |

Number of pages | 11 |

Journal | Journal of Porous Media |

Volume | 17 |

Issue number | 12 |

Publication status | Published - 2014 |

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### Keywords

- Conjugate heat transfer
- Finite element method
- Porous media
- Vertical annular cylinder

### ASJC Scopus subject areas

- Modelling and Simulation
- Biomedical Engineering
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering

### Cite this

*Journal of Porous Media*,

*17*(12), 1109-1119.

**Conjugate heat transfer in porous annulus.** / Salman, Ahmed N.J.; Kamangar, Sarfaraz; Badruddin, Irfan Anjum; Al-Rashed, Abdullah A.A.A.; Quadir, G. A.; Khaleed, H. M.T.; Yunus Khan, T. M.

Research output: Contribution to journal › Article

*Journal of Porous Media*, vol. 17, no. 12, pp. 1109-1119.

}

TY - JOUR

T1 - Conjugate heat transfer in porous annulus

AU - Salman, Ahmed N.J.

AU - Kamangar, Sarfaraz

AU - Badruddin, Irfan Anjum

AU - Al-Rashed, Abdullah A.A.A.

AU - Quadir, G. A.

AU - Khaleed, H. M.T.

AU - Yunus Khan, T. M.

PY - 2014

Y1 - 2014

N2 - The effect of conductivity ratio on temperature at a solid-porous interface is one of the most important aspects in conjugate heat transfer. The present work is undertaken to investigate heat transfer behavior in a porous annular vertical cylinder having a solid wall at the inner surface. The main objective of the present study is to evaluate the effect of solid wall thickness and conductivity ratio on heat transfer characteristics of the porous medium. The inner and outer surfaces of the annulus are maintained isothermally at Th and T∞, respectively, such that Th > T∞. The increase in conductivity ratio leads to an increase in temperature at the solid-porous interface. It is noticed that the temperature variation along the porous region is almost linear for higher values of conductivity ratio and wall thickness ratio. It is found that the fluid velocity decreases with increase in wall thickness. It is observed that the Nusselt number decreases with increase in solid wall thickness. The effect of the aspect ratio is found to be negligible when porous conductivity is much higher than that of the solid wall conductivity. The attainment of the maximum Nusselt number at Ar ≈ 1 in a porous annulus does not hold good for the conjugate heat transfer problem. The variation in Nusselt number is sensitive for higher wall thickness ratio and lower conductivity ratio.

AB - The effect of conductivity ratio on temperature at a solid-porous interface is one of the most important aspects in conjugate heat transfer. The present work is undertaken to investigate heat transfer behavior in a porous annular vertical cylinder having a solid wall at the inner surface. The main objective of the present study is to evaluate the effect of solid wall thickness and conductivity ratio on heat transfer characteristics of the porous medium. The inner and outer surfaces of the annulus are maintained isothermally at Th and T∞, respectively, such that Th > T∞. The increase in conductivity ratio leads to an increase in temperature at the solid-porous interface. It is noticed that the temperature variation along the porous region is almost linear for higher values of conductivity ratio and wall thickness ratio. It is found that the fluid velocity decreases with increase in wall thickness. It is observed that the Nusselt number decreases with increase in solid wall thickness. The effect of the aspect ratio is found to be negligible when porous conductivity is much higher than that of the solid wall conductivity. The attainment of the maximum Nusselt number at Ar ≈ 1 in a porous annulus does not hold good for the conjugate heat transfer problem. The variation in Nusselt number is sensitive for higher wall thickness ratio and lower conductivity ratio.

KW - Conjugate heat transfer

KW - Finite element method

KW - Porous media

KW - Vertical annular cylinder

UR - http://www.scopus.com/inward/record.url?scp=84919395117&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84919395117&partnerID=8YFLogxK

M3 - Article

VL - 17

SP - 1109

EP - 1119

JO - Journal of Porous Media

JF - Journal of Porous Media

SN - 1091-028X

IS - 12

ER -