Recirculation in an Annular-Type Jet Pump

[+] Author and Article Information
Donald F. Elger, Sam. J. Taylor

Mechanical Engineering, University of Idaho, Moscow, ID, 83844

Chyr P. Liou

Civil Engineering, University of Idaho, Moscow, ID, 83844

J. Fluids Eng 116(4), 735-740 (Dec 01, 1994) (6 pages) doi:10.1115/1.2911843 History: Received March 16, 1992; Revised April 25, 1994; Online May 23, 2008


For some annular-type jet pump applications, it is important to avoid formation of a recirculation zone in the mixing region. The goals of this research were to find (i) when recirculation occurs and (ii) the size and location of the resulting recirculation zone. Experiments were performed using air in a straight-walled, annular-type, ducted jet. Area ratio Aj /As varied from 0.39 to 0.89; here, A is flow area, and j and s identify the jet and secondary flows, respectively. Data showed that recirculation correlates with J, where J ≈ Pj /(Pj + Ps ), and P is rate of momentum. For the area ratios studied, recirculation begins when J exceeds a value ranging from 0.89 to 0.94. This paper also presents data showing the recirculation zone boundaries and presents a discussion of jet pump design.

Copyright © 1994 by The American Society of Mechanical Engineers
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