Laminar Natural Convection Study in a Horizontal Half- Elliptical Enclosure Using Heater on Horizontal Wall
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Date
2019
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Publisher
Université de M'sila
Abstract
A numerical analysis of laminar natural convection in a horizontal annulus between an
internal heated plane and an external cold half-elliptical was investigated using
approximation of Boussinesq. Both internal and external walls are maintained at the
constant temperature and air is the working fluid. Numerical solutions are obtained
using a commercial computational fluid dynamics package, FLUENT, using the finite
volume method. Effects of the Rayleigh number, Rat, on the Nusselt number, Nu, as
well as velocity and temperature fields are investigated for the range of Rat from 1.0
103 to 5.0 105. The results show that for a small thermal Rayleigh number, the heat
transfer within the annulus is essentially controlled by the conduction process. As the
thermal Rayleigh number increases (Rat ≥ 104), the role of convection becomes
predominant. Also the heat transfer rate increases. The aim of this study is to observe
the effects of thermal Rayleigh numberon the structure of the flow and the distribution
of the temperature.
Description
Keywords
Thermal transfer, Natural convection, Circular and half-elliptical, Multicellular flow, Laminar flow, Steady flow