Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 53, Issue 5-6, Pages 1119-1127Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2009.10.045
Keywords
Heat balance integral method; Refined integral method; Stefan problem; Phase change
Categories
Funding
- Institute of Applied Mathematics at the University of British Columbia
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When using a polynomial approximating function the most contentious aspect of the Heat Balance Integral Method is the choice of power of the highest order term In this paper we employ a method recently developed for thermal problems, where the exponent is determined during the solution process. to analyse Stefan problems This is achieved by minimising an error function The solution requires no knowledge of an exact solution and generally produces significantly better results than all previous HBI models. The method IS Illustrated by first applying it to standard thermal problems. A Stefan problem with ail analytical Solution is then discussed and results compared to the approximate Solution. An ablation problem is also analysed and results compared against a numerical solution In both examples the agreement is excellent A Stefan problem where the boundary temperature increases exponentially is analysed This highlights the difficulties that can be encountered with a time dependent boundary condition Finally, melting with a time-dependent flux is briefly analysed Without applying analytical or numerical results to assess the accuracy. (C) 2009 Published by Elsevier Ltd.
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