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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Interaction of Rayleigh - Benard Convection and Oscillatory Flows

Get access (open in a dialog) DOI: 10.1615/IHTC15.ncv.010004
pages 5253-5263

Résumé

The effects of oscillatory flow structures on transient convective heat transfer in an air-filled shallow enclosure with a vibrating side wall are investigated. Oscillatory flows and Rayleigh – Benard convection have been extensively studied by using theoretical and experimental methods. However, the investigations on the effects of transverse temperature gradients on oscillatory flow fields, associated transport phenomena and influence of various parameters on oscillatory flow structures are relatively scarce. To our knowledge, the influence of oscillatory flows on classical Rayleigh – Benard convection problem has not been studied. In the present study, the fluid motion is driven by the periodic vibration of the enclosure side wall. The vertical walls of the enclosure are adiabatic while the bottom wall is isothermally heated and the top wall is kept at isothermal initial temperature. The fully compressible form of the Navier – Stokes equations are considered to compute the interaction of oscillatory and gravitational flow fields. A control-volume method based, explicit time-marching Flux-Corrected Transport (FCT) Algorithm is used to simulate the transport phenomena in the enclosure. The results of an test case simulation with stationary walls are compared with the existing literature for code validation. Transverse temperature gradient induced by uniform wall heating (symmetrically or non-symmetrically) strongly affects the acoustic streaming structures and velocities. The oscillatory fluid motion significantly changes the transient behavior of heat transfer in the enclosure compared to pure conduction and Rayleigh – Benard convection.