The Role Of Natural Convection And Density
Variations In The Solidification Process Of Water
In An Annular Enclosure
Author(s)
E. M. Alawadhi & R. I. Bourisli
Abstract
Unsteady natural convection flow during the solidification process of water in the
annulus is numerically modeled using the finite element method. The annulus
inner surface temperature is kept at a temperature lower than the solidification
temperature. Ice is formed at the inner surface while natural convection flow is
induced in the liquid portion. The goal of this study is to evaluate the effect
of natural convection and variations in the density of water on the solidification
process. The water density peak near the solidification temperature creates a
unique flow structure. High resolution capturing of the solid/liquid moving
boundary and the details of the flow structure and temperature contours are
presented.
Keywords: natural convection, solidification, density variation, annulus enclosure.
1 Introduction
Phase change heat transfer has been extensively studied experimentally and
theoretically in literature during the past two decades. Phase change has a wide
range of utility in scientific and engineering applications. These applications
include, for example, solar energy storage units, industrial refrigeration, crystal
growth, welding and casting. During melting process, the effective specific heat of
a substance is increased by more than 100 times, storing a large amount of energy.
On the other hand, during solidification process, the specific heat is decreased to
release a large amount of energy. Phase-change materials (PCM’s) are substances
that are used to store/release thermal energy by utilizing this effective specific heat
Keywords
natural convection, solidification, density variation, annulus enclosure.
Related Book
Other papers in this volume
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