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Experimental Investigations on Interaction of Two Drops by Thermocapillary-Buoyancy Migration
Experiments were performed, in a terrestrial environment, to study the migration and interaction of two drops with different diameters
in matrix liquid under temperature gradient field. Pure soybean oil and silicon oil were used as matrix liquid and the drop liquid,
respectively. The information on the motions of two drops was recorded by CCD camera system in the experiments to analyze the trajectories
and velocities of the drops. Our experiments showed that, upon two drops approaching each other, the influence of the larger
drop on the motion of the smaller one became significant. Meanwhile the smaller drop had a little influence on the larger one all the time.
The oscillation of migration velocities of both drops was observed as they were approaching. For a short period the smaller drop even
moved backward when it became side by side with the larger one during the migration. Although our experimental results on the behavior
of two drops are basically consistent with the theoretical predictions, there are also apparent differences.
2006 Elsevier Ltd. All rights reserved.
Keywords: Thermocapillary migration; Drop; Interaction; Oscillation
1. Introduction
A bubble or drop will move when placed in another fluid
with temperature gradient. This motion happens as a
consequence of the variation of interfacial tension with
temperature. Such a phenomenon is already known as
Marangoni migration problem. With the development of
microgravity science, bubble dynamics and droplet dynamics
became a hot point problem of research because this
investigation is very important for basic research as well
as for applications in reduced gravity environment, such
as space material science, chemical engineering and so on.
Young et al. first investigated the thermocapillary
migration o