Investigation On Mixed Convection In A
Horizontal Channel Heated From Below
Author(s)
O. Manca, S. Nardini & V. Naso
Abstract
In this work mixed convection in a horizontal channel with the lower wall heated
at a uniform heat flux is studied experimentally. The experiments are performed
in air. The analysis is accomplished for several heat fluxes and forced air
velocities. The Reynolds numbers investigated are between 10 and 500, these
being in the laminar regime. The Richardson number Ri=Gr/Re2 holds values in
the range 0.1–100. Flow visualization is performed to detect the flow patterns
into the channel. The wall temperature distribution is given as a function of the
Gr/Re2 values.
Keywords: mixed convection, electronic cooling, material processing, thermal
control.
1 Introduction
Mixed convection in channels has received great interest for its engineering
applications such as thermal control of electronic equipments and chemical vapor
deposition (CVD). In horizontal channels heated from below, the buoyancy force
can induce secondary flow that can lead to enhance the local heat transfer. The
onset point of the secondary flow is important because it delineates the region
after which the two-dimensional laminar flow becomes three-dimensional [1,2].
The unstable and stable vortex flow associated to the secondary flow is
advantageous for some application such as cooling of electronic equipments [3].
In other technological applications such as in the CVD processes used to grow
thin crystal films on silicon substrates, the presence of the vortex flow will result
in a non-uniform deposition on the substrates [4]. Both the stable and unstable
vortex flows should be avoided in the CVD processes. It has been found [1,2,5,6]
that onset of the secondary flow and the enhancement of the heat transfer
Keywords
mixed convection, electronic cooling, material processing, thermal
control.
Related Book
Other papers in this volume
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