TY - JOUR
T1 - Comments on the paper by M. F. Letelier and D. A. Siginer
T2 - 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
AU - Huilgol, R. R.
PY - 2018/4
Y1 - 2018/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85039851883&partnerID=8YFLogxK
U2 - 10.1016/j.ijengsci.2017.12.007
DO - 10.1016/j.ijengsci.2017.12.007
M3 - Comment/debate
SN - 0020-7225
VL - 125
SP - 36
EP - 39
JO - International Journal of Engineering Science
JF - International Journal of Engineering Science
ER -