Comments on the paper by M. F. Letelier and D. A. Siginer : On the flow of a class of viscoinelastic–viscoplastic fluids in tubes of non-circular contour. International Journal of Engineering Science, Vol. 45 (2007), 873–881

It is shown that the solution to the steady flow of a Newtonian fluid in a pipe of equilateral triangular cross-section is wrong, for it is based on an inappropriate choice of a parameter and the incorrect use of trigonometry. Secondly, the assumption that the shear stresses in a steady flow in a pi...

Full description

Saved in:

Bibliographic Details
Published in:	International journal of engineering science Vol. 125; pp. 36 - 39
Main Author:	Huilgol, R.R.
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 01-04-2018 Elsevier BV
Subjects:	Newtonian fluids Non-Newtonian fluids Pipes Shear stress Steady flow Trigonometry Tubes
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	It is shown that the solution to the steady flow of a Newtonian fluid in a pipe of equilateral triangular cross-section is wrong, for it is based on an inappropriate choice of a parameter and the incorrect use of trigonometry. Secondly, the assumption that the shear stresses in a steady flow in a pipe are given by the gradient of a scalar function is also incorrect, since it depends on the equality between directional and partial derivatives everywhere.
ISSN:	0020-7225 1879-2197
DOI:	10.1016/j.ijengsci.2017.12.007