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Applied Bionics and Biomechanics - Volume 10 2013, Issue 1, Pages 19-27

Mathematics & Statistic Department, Faculty of Science, Taif University, Hawia888 Taif, Saudi Arabia

Mathematical Department, Faculty of Science Men, Al-Azhar University, Nasr City, Cairo, Egypt

Mathematics Department, Faculty of Science, Al-Azhar UniversityAssiut Branch, Assiut, Egypt

Mathematics Department, Faculty of Science and Arts, Khulais, King Abdulaziz University KAU, Saudi Arabia

Basic science Department, Higher Institute of Engineering, Shorouk City, Cairo, Egypt

Copyright © 2013 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper discusses the effect of peristaltic transport on the fluid flow in the gap between two eccentric tubes eccentric-annulus flows. The inner tube is uniform, rigid, while the outer tube has a sinusoidal wave traveling down its wall. The flow analysis has been developed for low Reynolds number and long wave length approximation. The velocity and the pressure gradient have been obtained in terms of the dimensionless flow rate Q¯, time t, azimuthal coordinate θ and eccentricity parameter ϵ the parameter that controls of the eccentricity of the inner tube position. The results show that there is a significant deference between eccentric and concentric annulus flows.

Autor: Kh. S. Mekheimer, Y. Abd elmaboud, and A. I. Abdellateef



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