Overstability of a Viscoelastic Fluid Layer Oscillating in a Vertical Periodic Motion and Heated From Below

[+] Author and Article Information
S. O. Onyegegbu

Department of Mechanical Engineering, University of Nigeria, Nsukka, Nigeria

J. Appl. Mech 46(2), 454-456 (Jun 01, 1979) (3 pages) doi:10.1115/1.3424570 History: Received May 01, 1978; Revised October 01, 1978; Online July 12, 2010


This Note examines the effect of vertical periodic motion on the stability characteristics of a viscoelastic fluid layer in a classical Benard geometry. Numerical solutions show that a resonant type behavior which enhances stability occurs at oscillation frequencies near the convective natural frequency of the viscoelastic fluid, while the effect of the periodic motion vanishes as the oscillation frequency gets very large.

Copyright © 1979 by ASME
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