Rayleigh-Marangoni-Benard instability in two-layer fluid system
- 152 Downloads
Rayleigh-Marangoni-Bénard instability in a system of two-layer fluids is studied numerically. The convective instabilities in the system of Silicon Oil (10cSt) and Fluorinert (FC70) liquids have been analyzed. The critical parameters at onset of convection are presented in a large range of two-layer depth ratios from 0.2 to 5.0. Numerical results show that the instability of the two-layer system depends strongly on its depth ratio. When the depth ratio increases, the instability mode changes from mechanical coupling to thermal coupling. Between these two typical coupling modes, a time-dependent oscillation is detected. Nevertheless, traveling wave states are found in the case of oscillatory instability. The oscillation mode results from the competition between Rayleigh instability and Marangoni effect.
Key WordsRayleigh-Marangoni-Bénard convection instability two-layer liquids numerical simulation
Unable to display preview. Download preview PDF.
- 5.Richer FM, Mckenzie DP. On some consequences and possible causes of layered mantle convection.J Geo Res, 1981, 86(B7): 6133–6142Google Scholar
- 12.Liu QS, Roux B. Instability of thermocapillary convection in multiple superposed immiscible liquid layers. In: Proc VIIIth European Symp on Materials and Fluid Sciences in Microgravity, Brussels, Belgium, 1992, ESA SP-333. 735–740Google Scholar
- 16.Zhang JF Experimental investigation on the Benard-Marangoni convection in two immiscible liquid layers. [Master Thesis], Hefei: University of Science and Technology of China, 2001Google Scholar
- 18.Liu QS. Marangoni convection in multiple liquid layers.Acta Mechanica Sinica, 2002, 34(4): 481–491 (in Chinese)Google Scholar