Combined forced- and natural-convection heat transfer in horizontally counterrotating eccentric and concentric cylinders

Nassar H. Abu-Sitta, Khalil Khanafer, Kambiz Vafai, Abdalla M. Al-Amiri

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The present investigation focuses on the numerical simulation of mixed-convection heat transfer in a horizontal annulus configuration. The flow is set to operate in the laminar regime under steady-state condition. A counterrotating cylinder arrangement is considered while the inner cylinder is heated. A nonuniform grid size is employed in the radial direction to capture the velocity and temperature distributions near the walls. Furthermore, discretization of the governing equations is achieved using a finite-element scheme based on the Galerkin method of weighted residuals. The flow and thermal characteristics are explored for a pertinent range of dimensionless velocity ratio, gap-width ratio, and Rayleigh number given by 05, 0.55.0, and 103Ra105 while eccentricity factor (r, ) is varied over various radial and angular positions. The local Nusselt number distributions along the cylinders are documented over a range of operating conditions.

Original languageEnglish
Pages (from-to)1167-1186
Number of pages20
JournalNumerical Heat Transfer; Part A: Applications
Volume51
Issue number12
DOIs
Publication statusPublished - Jan 2007

ASJC Scopus subject areas

  • Numerical Analysis
  • Condensed Matter Physics

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