Numerical Investigation Of Natural Convection
Of Air In Vertical Divergent Channels
Author(s)
O. Manca, S. Nardini, D. Ricci & S. Tamburrino
Abstract
A numerical transient analysis of natural convection in air in vertical divergent
channels is accomplished. The channel walls are heated at uniform heat flux, the
problem is two-dimensional and laminar and the full Navier-Stokes and energy
equations are employed. Results in terms of average wall temperature profile, as
a function of the time, wall temperature distributions for inclination angle and
minimum wall spacing are presented. The simulation allows the detection of
complex structures of the flow inside and outside the channel. Temperature
profiles as a function of time show overshoot and undershoot. A comparison
between numerical flow patterns and experimental flow visualizations are also
given and a good agreement is observed.
Keywords: natural convection, divergent channel, transient analysis.
1 Introduction
Natural convection in channels and parallel plates received very much attention
for its application in engineering as reviewed in [1, 2]. These configurations have
been employed in chemical vapor deposition reactors, solar collectors, nuclear
reactors, heat exchangers and thermal control of electronic systems [3,4].
Nowadays, trends in natural convection heat transfer are oriented toward either
the seeking of new configurations to enhance the heat transfer parameters or the
optimization of standard configurations [5, 6]. In fact, recent research efforts
have been devoted to define simple geometrical modification of the channel
configurations to improve its thermal performance in natural convection [5–7].
Among them divergent vertical channels with two heated principal walls are very
simple ones [9–12].
Keywords
natural convection, divergent channel, transient analysis.
Related Book
Other papers in this volume
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