Effects of the side walls on starting flows in ducts

Erdogan M., İmrak C. E.

INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS, vol.40, no.1, pp.103-111, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 1
  • Publication Date: 2005
  • Doi Number: 10.1016/j.ijnonlinmec.2004.05.015
  • Journal Name: INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.103-111
  • Keywords: viscous fluid, semicircular duct, rectangular duct, circular pipe, effect of side walls, SUDDEN APPLICATION, PRESSURE-GRADIENT, RECTANGULAR DUCTS, IMPULSIVE MOTION, BOUNDARY
  • Istanbul Technical University Affiliated: Yes

Abstract

This article considers the effects of the side walls on the unsteady flow of an incompressible viscous fluid in a duct of uniform cross-section. In order to show the effects of the side walls, three illustrative examples are given. They are: the starting flow in a duct of semicircular cross-section, the starting flow in a duct of rectangular cross-section and the starting flow in a duct of circular cross-section. The velocity distributions and the volume fluxes obtained for these flows are compared and it is shown that the flow in a duct of semicircular cross-section reaches steady state earlier than those for the flow in a duct of circular cross-section and for the flow in a duct of square cross-section. It is found that there are remarkable effects of the side walls of a duct on the required time to attain the asymptotic values of flow properties. (C) 2004 Elsevier Ltd. All rights reserved.