Conjugate heat transfer in an inclined slab with an array of horizontal circular channels

Chin-Hsiang Cheng, Jiun Huei Yu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Effects of buoyancy on thermal characteristics of conjugate heat transfer across an inclined slab with an array of horizontal, circular channels inside are investigated numerically. Results are presented for Prandtl numbers of 0.7 and 4 over wide ranges of values of Grashof number Gr and thermal conductivity ratio, with the angle of inclination phi ranging from 0 to 180 from the horizontal. It is found that higher heat transfer rates can be obtained when the slab is inclined with phi 60 - 90. For some particular cases, a 30% increase in heat transfer, but only 8% increase in friction factor, may by obtained by changing the inclination angle. In general, the secondary fluid flow exhibits a single-cell pattern in the channel within the inclined slab with the exception of the cases at phi 180 and 0. For phi 180 (hot top) and phi 0 (hot bottom), a symmetric four-cell secondary flow pattern may be observed at lower Gr. However, for the hot-bottom cases, when Gr exceeds a threshold value, the secondary flow resumes the single-cell pattern and a significant increase in the Nusselt number is clearly observed. For the parameter ranges considered in this study, the threshold value is located within Gr=104-105, dependent on the physical and geometric parameters.

Original languageEnglish
Pages (from-to)779-796
Number of pages18
JournalNumerical Heat Transfer; Part A: Applications
Volume35
Issue number7
DOIs
Publication statusPublished - 1999 May 15

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Conjugate Heat Transfer
Secondary Flow
Inclined
slabs
secondary flow
Horizontal
heat transfer
Secondary flow
Inclination
Heat transfer
Threshold Value
inclination
Heat Transfer
Cell
cells
Angle
Grashof number
friction factor
thresholds
Nusselt number

All Science Journal Classification (ASJC) codes

  • Numerical Analysis
  • Condensed Matter Physics

Cite this

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Conjugate heat transfer in an inclined slab with an array of horizontal circular channels. / Cheng, Chin-Hsiang; Yu, Jiun Huei.

In: Numerical Heat Transfer; Part A: Applications, Vol. 35, No. 7, 15.05.1999, p. 779-796.

Research output: Contribution to journalArticle

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