| Title: | Comments on “Numerical Studies for Flow and Heat Transferof the Powell–Eyring Fluid Thin Film Over an Unsteady Stretching Sheet With Internal Heat Generation Using the Chebyshev Finite Difference Method” by M.M. Khader and Ahmed M. Megahed, Journal of Applied Mechanics and Technical Physics, Vol. 54, No. 3, pp. 440–450, 2013. |
| 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 M.M. Khader and Ahmed M. Megahed in Journal of Applied Mechanics and Technical Physics, Vol. 54, No. 3, pp. 440-450, 2013. .pdf |
| Supplementary materials | Not Available |
| Abstract: |
Recently, the study of the flow and heat transfer of non-Newtonian fluids in thin liquid film over a stretching sheet has considerable attention due to its important in many industrial application. The authors [1] numerically studied the problem of Powell-Eyring fluid film past a stretching sheet using Chebyshev finite difference method. There are many fundamental errors: 1. The transformed momentum equation ( Eq.(5)) is wrong . 2. From the definition of the wall shear stress of the Powell-Eyring fluid , it is easy to see that the local skin- friction coefficient given in ref. [ is wrong. |
