Comments on the paper by Y-H. Wu and K-F Liu : Start-up flow of a Bingham fluid between coaxial cylinders under a constant wall shear stress journal of non-Newtonian fluid mechanics 223 (2015), 116-121

Huilgol RR

Journal of Non-Newtonian Fluid Mechanics, Vol.244, 42-43, 2017

DOI10.1016/j.jnnfm.2017.04.003 Export Citation

Comments on the paper by Y-H. Wu and K-F Liu : Start-up flow of a Bingham fluid between coaxial cylinders under a constant wall shear stress journal of non-Newtonian fluid mechanics 223 (2015), 116-121

Huilgol RR

The contents of the paper raise several doubts for two reasons. Firstly, the assumptions regarding the shear stress and the velocity profile are wrong for they violate Cauchy's stress principle. Secondly, the use of Laplace transform to solve the start-up flow problem is incorrect. (C) 2017 Elsevier B.V. All rights reserved.