RESEARCH PAPERS: Natural and Mixed Convection

Buoyant Pulsating Exchange Flow Through a Vent

[+] Author and Article Information
T. A. Conover, R. Kumar, J. S. Kapat

Department of Mechanical Engineering, Clemson University, Clemson, SC 20634

J. Heat Transfer 117(3), 641-648 (Aug 01, 1995) (8 pages) doi:10.1115/1.2822625 History: Received July 01, 1994; Revised November 01, 1994; Online December 05, 2007


Buoyancy-driven bidirectional pulsating exchange flow through a vent in a horizontal partition is studied experimentally using a brine/water system. The associated transient and pulsating exchange flows were studied by densimetric measurements, flow visualization, and laser Doppler velocimetry (LDV) measurements for three different vent length-to-diameter ratios: 0.106, 0.0376, and 0.008. A time scale, based on the rate of decay of the density difference between the two compartments, is developed that collapses all experimental data regarding the decay of density in the top compartment into one curve. Flow visualization was used to understand the flow features contributing to the pulsating flow and to provide a quantitative measure of the major pulsation frequency. Interfacial instability between brine and water at the vent was found to contribute to the pulsation. The pulsation frequencies and their decay were determined from the power spectrum of LDV measurements. For the small length-to-diameter ratios (0.008 and 0.0376) there are two different frequencies that decay at different rates, suggesting multiple flow processes that contribute to flow pulsations.

Copyright © 1995 by The American Society of Mechanical Engineers
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