THERMAL SCIENCE

International Scientific Journal

D. B. Khillarkar

,

S. Devahastin

,

Arun S. Mujumdar

EFFECT OF FLIPPING ON FREE CONVECTIVE HEAT TRANSFER DURING MELTING OF A PHASE CHANGE MATERIAL IN CONCENTRIC HORIZONTAL ANNULI OF DIFFERENT CROSS-SECTION

ABSTRACT
Results are presented of a finite element computational study of the free convection-dominated melting of a pure phase change material contained in concentric horizontal annuli of the following configuration:
(a) Square external tube with a circular tube inside - Annulus Type A
(b) Circular external tube with a square tube inside - Annulus Type B
Effect of heating the inside wall at a temperature above the melting point of the material was studied. Flow and temperature patterns within the melt, local heat flux distributions at the heating surface and the cumulative energy charged as a function of time are presented and discussed. The effect of flipping which involves inverting the container upside-down at pre-selected times after initiation of melting as a measure to increase the heat transfer rate during the later stage of the melting process is examined and discussed. It is shown that this simple yet effective technique presents a simple way to enhance the overall melting rate, t.e., the cumulative heat storage.
PAPER SUBMITTED: 1999-02-22
PAPER REVISED: 1999-03-10
PAPER ACCEPTED: 1999-06-28
PUBLISHED ONLINE: 2020-09-27
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 1998, VOLUME 2, ISSUE Issue 2, PAGES [27 - 43]
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EFFECT OF FLIPPING ON FREE CONVECTIVE HEAT TRANSFER DURING MELTING OF A PHASE CHANGE MATERIAL IN CONCENTRIC HORIZONTAL ANNULI OF DIFFERENT CROSS-SECTION

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence