THERMOVIBRATIONAL CONVECTION IN A VERTICAL CYLINDER

We have completed a study of thermovibrational convection in a vertica l, cylindrical cavity for Rayleigh numbers, Ra, of 0, 10(4) and 10(5), and vibrational Grashof numbers, Gr(v), of 10(5) and 10(6). Results i ndicate that vibrational convection greatly increases heat transfer ra tes over the unmodulated case-by 7-15% at Gr(v) = 10(5) and by 50-65% at Gr(v) = 10(6). The observed resonant frequencies seem to agree reas onably well with the predictions given by the resonance frequency expr ession derived by Fu and Shieh [Int. J. Heat Mass Transfer 35, 1695-17 10 (1992)]. However, this equation has been modified to include the ef fect of a static gravitational component and this modified equation ap pears to give better results when Ra and Gr(v) are roughly comparable in magnitude. Copyright (C) 1996 Elsevier Science Ltd.