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Prof. Mostafa Abdel Hameed Ahmed Mahmoud :: Publications: |
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| Title: | Comment on “Variable viscosity and slip velocity effects on the flow and heat transfer of a power-law fluid over a non-linearly stretching surface with heat flux and thermal radiation ” Ahmed M. Megahed , Rheologica Acta, 51, pp. 841847 (2012) . |
| Authors: | Mostafa A. A. Mahmoud |
| Year: | 2015 |
| Keywords: | Not Available |
| Journal: | researchgate.net |
| Volume: | Not Available |
| Issue: | Not Available |
| Pages: | Not Available |
| Publisher: | Not Available |
| Local/International: | International |
| Paper Link: | Not Available |
| Full paper | Mostafa Abdel Hameed Ahmed Mahmoud_Comments on the published paper by Ahmed M. Megahed in Rheologica Acta, 51, pp. 841847 (2012) .pdf |
| Supplementary materials | Not Available |
| Abstract: |
In the above paper [1], the author claimed that the similarity solution exists only when the exponent m= [1]. It is shown that this condition insufficient to support his claim. It is found that the similarity solution exists in two cases only : 3/1(i) m= and the slip parameter 3/10=λ(no-slip surface condition); (ii) n=1(Newtonian fluid) and m=1 (linear stretching surface). Also, it is shown that the local skin –friction coefficient defined by the author in ref. [1] is wrong. Consequently, the viscosity parameter α, the radiation parameter R and the Prandtl number have opposite effects on the local skin –friction coefficient than that obtained in ref. [1] . |
