Please look at my paper in Wear published  in 1998.

Thank you  Prof . Rakesh

yes Exactly Mr. Aziz , I mean the previous researches

thank you

Hello Hussein,

if you are interested in the results in terms of a pressure drop and not in some other field variables, it could be helpful to also consider experimental results. With CFD and experimental results, you will have a much broader basis for a literatur survey.

For experimental results presented in a very clean manner with easy to understand explanations and definitions i would suggest the book

Internal Flow Systems

by

D.S. Miller

Best regards

Bastian

 the book is very  helpful

cheers