THERMAL SCIENCE
International Scientific Journal
AN APPROXIMATE ANALYTICAL (INTEGRAL-BALANCE) SOLUTION TO A NONLINEAR HEAT DIFFUSION EQUATION
ABSTRACT
The communication presents a closed form approximate solution of the nonlinear diffusion equation of a power-law nonlinearity of the diffusivity developed by the heat-balance integral method. The main step in the initial transformation of the governing equation avoiding the Kirchhoff transformation is demonstrated. The consequent application of the integral method is exemplified by a solution of a Dirichlet problem with an approximate parabolic profile. Cases with predetermined positive integer and optimized non-integer exponents have been analyzed.
KEYWORDS
PAPER SUBMITTED: 2014-03-26
PAPER REVISED: 2014-04-19
PAPER ACCEPTED: 2014-06-13
PUBLISHED ONLINE: 2014-06-21
THERMAL SCIENCE YEAR
2015, VOLUME
19, ISSUE
Issue 2, PAGES [723 - 733]
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