Start‐up Flow In The Entrance Region Of A Circular Tube

Abstract

An analytical study of the motion of a viscous, incompressible fluid, initially at rest and rapidly set in motion under a constant head, in the entrance region of a circular tube is described. A procedure based on the numerical solution of the momentum‐integral equation is used in this study. The time‐dependent entrance flow rate which must be prescribed in the analysis is obtained from the solution of the over‐all dynamic problem considering the instantaneous axial pressure gradient experimentally determined in a physically realizable start‐up flow process. The time‐variation in the boundary layer thickness and velocity profile at various axial locations along the tube and instantaneous entrance lengths are calculated.

Department(s)

Mechanical and Aerospace Engineering

International Standard Serial Number (ISSN)

1521-4001; 0044-2267

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Wiley, All rights reserved.

Publication Date

01 Jan 1971

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