0
RESEARCH PAPERS

The Origin of Instability in Airlift Pumps

[+] Author and Article Information
S. Hjalmars

Royal Institute of Technology, Stockholm, Sweden

J. Appl. Mech 40(2), 399-404 (Jun 01, 1973) (6 pages) doi:10.1115/1.3422994 History: Received February 01, 1972; Revised July 01, 1972; Online July 12, 2010

Abstract

A preliminary analysis is made of the well-known instability, occurring in airlift pumps, when at sufficiently high rise the ability of the pump as a self-controlling system breaks down, and a rapidly increasing oscillation of the flow sets in. It is shown that the instability is due to the fact that a small time-dependent perturbation of the stationary flow satisfies a difference-differential equation with time lag, of a kind well known from control theory. The theoretically computed values of the critical rise and the time period of oscillation are in satisfactory agreement with observation.

Copyright © 1973 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In