Abo Bibliothek: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Resonance of internal gravity wave by a bottom-wall oscillation in a square cavity

Get access (open in a dialog) DOI: 10.1615/IHTC12.50
6 pages

Abstrakt

An experiment has been implemented to verify the resonant phenomenon of the internal gravity wave by an external mechanical oscillation in a side-heated square cavity. The experimental results obtained show that the amplitude of fluctuation in internal air temperature have a peak value at a specific forcing frequency, which exhibits the resonance phenomenon that has been numerically reported by many researchers. The resonant frequency is little affected by the increase of the displacement of external oscillation at a fixed Rayleigh number, while it augments the amplitude of fluctuation of internal air temperature. As the Rayleigh number increases, the resonant frequency increases. The present experimental results for the resonant frequency are in good accordance with the previous numerical predictions based on the Brunt-Vaisala frequency. Consequently, the resonance occurs when the external forcing frequency is in tune with the frequency of internal gravity wave.