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TECHNICAL BRIEFS

An Experimental Investigation of Possible Methods to Reduce Laminar Entry Lengths

[+] Author and Article Information
A. F. Emery

University of Washington, Seattle, Wash.

C. S. Chen

Department of Mechanical Engineering, University of Michigan, Ann Arbor, Mich.

J. Basic Eng 90(1), 134-137 (Mar 01, 1968) (4 pages) doi:10.1115/1.3605053 History: Received November 10, 1967; Online November 03, 2011

Abstract

The use of annuli, converging nozzles, and a converging-diverging wall section in round tubes to reduce the laminar entry lengths was studied. Over a very limited range of Reynolds numbers only the largest diameter annuli were partially effective—and then only by yielding a reduction of 20 percent.

Copyright © 1968 by ASME
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