Oscillatory instability of Rayleigh-Marangoni-Bénard convection in two-layer liquid systems

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	Oscillatory instability of Rayleigh-Marangoni-Bénard convection in two-layer liquid systems
	Liu QS(刘秋生); Zhou BH; Tang ZM(唐泽眉)
刊名	Journal of Non-Equilibrium Thermodynamics
	2005
卷号	30 期号:3 页码:305-319
ISSN号	0340-0204
中文摘要	The oscillatory behaviour of the Rayleigh-Marangoni-Bénard convective instability (R-M-B instability) regarding two combinations of two-layer fluid systems has been investigated theoretically and numerically. For the two-layer system of Silicone oil (10cSt) over Fluorinert (FC70), both linear instability analysis and 2D numerical simulation show that the instability of the system depends strongly on the depth ratio Hr = H1/H2 of the two-layer liquid. The oscillatory regime at the onset of R-M-B convection enlarges with reducing Γ = Ra/Ma values. In the two-layer system of Silicone oil (2cSt) over water, it loses its stability and onsets to steady convection at first, then the steady convection bifurcates to oscillatory convection with increasing Rayleigh number Ra. This behaviour was found through numerical simulation above the onset of steady convection in the case of r = 2.9, ε=(Ra-Ruc)/Rac = 1.0, and Hr = 0.5. Our findings are different from the previous study of the Rayleigh-Benard instability and show the strong effects of the thermocapillary force at the interface on the time-dependent oscillations at or after the onset of convection. We propose a secondary oscillatory instability mechanism to explain the experimental observation of Degen et al. [Phys. Rev. E, 57 (1998), 6647-6659].
学科主题	力学
类目[WOS]	Thermodynamics ; Mechanics
研究领域[WOS]	Thermodynamics ; Mechanics
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000232106700009
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/16866]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Liu QS,Zhou BH,Tang ZM. Oscillatory instability of Rayleigh-Marangoni-Bénard convection in two-layer liquid systems[J]. Journal of Non-Equilibrium Thermodynamics,2005,30(3):305-319.
APA	Liu QS,Zhou BH,&Tang ZM.(2005).Oscillatory instability of Rayleigh-Marangoni-Bénard convection in two-layer liquid systems.Journal of Non-Equilibrium Thermodynamics,30(3),305-319.
MLA	Liu QS,et al."Oscillatory instability of Rayleigh-Marangoni-Bénard convection in two-layer liquid systems".Journal of Non-Equilibrium Thermodynamics 30.3(2005):305-319.