Two Bubbles Thermocapillary Migration Experimental System

IMECH-IR > 力学所知识产出(1956-2008)

	Two Bubbles Thermocapillary Migration Experimental System
	Kang Q(康琦); Huang C; Hu L(胡良); Duan L(段俐); Liang CH; Kang Q(康琦)
会议录名称	55th International Astronautical Congress of the International Astronautical Federation
	2004-10-04
会议名称	55th International Astronautical Congress-Vancouver,Canada,2004-10-04
会议日期	2004-10-04
会议地点	Vancouver,Canada
摘要	An experimental investigation will be performed on the thermocapillary motion of two bubbles in Chinese return-satellite. The experiment will study the migration process of bubble caused by thermocapillary effect in microgravity environment, and their interaction between two bubbles. The bubble is driven by the thermocapillary stress on the surface on account on the variation of the surface tension with temperature. The interaction between two bubbles becomes significant as the separation distance between them is reduced drastically so that the bubble interaction has to be considered. Recently, the problem has been discussed on the method of successive reflections, and accurate migration velocities of two arbitrarily oriented bubbles were derived for the limit of small Marangoni and Reynolds numbers. Numerical results for the migration of the two bubbles show that the interaction between two bubbles has significant influence on their thermocapillary migration velocities with a bubble approaching another. However, there is a lack of experimental validate for the theoretic results. Now the experimental facility is designed for experimenting time after time. A cone-shaped top cover is used to expel bubble from the cell after experiment. But, the cone-shaped top cover can cause temperature uniformity on horizontal plane in whole cell. Therefore, a metal board with multi-holes is fixed under the top cover. The board is able to let the temperature distribution on the board uniform because of their high heat conductivity, and the bubble can pass through it. In the system two bubbles are injected into the test cell respectively by two sets of cylinder. And the bubbles sizes are controlled by two sets of step-by-step motor. It is very important problem that bubble can be divorced from the injecting mouth in microgravity environment. Thus, other two sets of device for injecting mother liquid were used to push bubble. The working principle of injecting mother liquid is to utilize pressure difference directly between test cell and reservoir
语种	英语
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/13780
专题	力学所知识产出(1956-2008)
通讯作者	Kang Q(康琦)
推荐引用方式 GB/T 7714	Kang Q,Huang C,Hu L,et al. Two Bubbles Thermocapillary Migration Experimental System[C]55th International Astronautical Congress of the International Astronautical Federation,2004.

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