Effect Of Thermal Boundary Conditions On
Conjugate Natural Convection Flow In Vertical
Eccentric Annuli
Author(s)
A. Jamal, M. A. I. El-Shaarawi & E. M. A. Mokheimer
Abstract
The effect of thermal boundary conditions on conjugate laminar natural
convection heat transfer in vertical eccentric annuli is numerically investigated
using the finite-difference technique. Numerical results are presented for a
Newtonian fluid of Prandtl number 0.7 in an eccentric annulus. The variation of
induced flow rate and total heat absorbed in the annulus are studied for two sets
of boundary conditions at different values of geometry parameters
(dimensionless annulus eccentricity and radius ratio). In both sets of boundary
conditions, one wall is heated isothermally. The other wall is kept at the inlet
fluid temperature for the first set of boundary conditions and adiabatic for the
second set. The effect of interchanging the wall thermal conditions for each set is
also considered. Analysis reveals that heating the outer cylinder wall or keeping
one of the annulus walls insulated is more useful for inducing flow (thermosiphons).
Keywords: natural convection, heat transfer, eccentric annuli, thermal
boundary conditions, finite difference method, Newtonian fluid.
1 Introduction
The study of steady laminar induced flow in vertical eccentric annuli with
conjugate heat transfer is of great importance because of its many engineering
applications in electrical, nuclear, solar and thermal storage fields. In the
Keywords
natural convection, heat transfer, eccentric annuli, thermal
boundary conditions, finite difference method, Newtonian fluid.
Related Book
Other papers in this volume
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