Author： Abu-Sitta Nassar H.
Publisher： Taylor & Francis Ltd
ISSN： 1521-0634
Source： Numerical Heat Transfer Part A: Applications, Vol.51, Iss.12, 2007-01, pp. : 1167-1186
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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 0 ≤ ≤ 5, 0.5 ≤ ≤ 5.0, and 103 ≤ Ra ≤ 105 while eccentricity factor ε(r, φ) is varied over various radial and angular positions. The local Nusselt number distributions along the cylinders are documented over a range of operating conditions.
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