Turn-ON and Turn-OFF Times for a Laminar Jet

[+] Author and Article Information
S. Abramovich, A. Solan

Department of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa, Israel

J. Dyn. Sys., Meas., Control 95(2), 155-160 (Jun 01, 1973) (6 pages) doi:10.1115/1.3426672 History: Received March 16, 1973; Online July 13, 2010


Experimental results of the speed of travel of a disturbance in front of suddenly switched-on and switched-off submerged laminar jets are presented. The results show that the time lag for a switched-off jet is approximately one half the time required for a particle moving in front of a switched on jet to reach a certain distance from the jet nozzle. The time lags for an instantaneous change in the jet intensity is approximately the same as that for switching the whole jet on and off. These experimental data can be used to calculate the switching times of turbulence amplifiers.

Copyright © 1973 by ASME
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