Comment on ‘Lie group analysis and numerical solutions for non-Newtonian nanofluid flow in a porous medium with internal heat generation’

2017 ◽  
Vol 92 (6) ◽  
pp. 067001 ◽  
Author(s):  
Asterios Pantokratoras
Keyword(s):  
Porous Medium ◽  
Heat Generation ◽  
Lie Group ◽  
Numerical Solutions ◽  
Group Analysis ◽  
Internal Heat ◽  
Internal Heat Generation ◽  
Lie Group Analysis ◽  
Nanofluid Flow

Integral Solutions of Phase Change With Internal Heat Generation

2004 ◽  
Author(s):  
Ali Siahpush ◽  
John Crepeau
Keyword(s):  
Differential Equation ◽  
Phase Change ◽  
Heat Generation ◽  
Numerical Solutions ◽  
Internal Heat ◽  
Melting Rate ◽  
Internal Heat Generation ◽  
Stefan Number ◽  
Temperature Boundary ◽  
Solid Liquid

This paper presents solutions to a one-dimensional solid-liquid phase change problem using the integral method for a semi-infinite material that generates internal heat. The analysis assumed a quadratic temperature profile and a constant temperature boundary condition on the exposed surface. We derived a differential equation for the solidification thickness as a function of the internal heat generation (IHG) and the Stefan number, which includes the temperature of the boundary. Plots of the numerical solutions for various values of the IHG and Stefan number show the time-dependant behavior of both the melting and solidification distances and rates. The IHG of the material opposes solidification and enhances melting. The differential equation shows that in steady-state, the thickness of the solidification band is inversely related to the square root of the IHG. The model also shows that the melting rate initially decreases and reaches a local minimum, then increases to an asymptotic value.

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