Thermocapillary convection occurs when a radial temperature difference is subjected to an open cylindrical annuli. It is driven by temperature-induced interfacial-tension variation. Combined with the gravity on the ground, the buoyant-thermocapillary convection becomes more complex. When temperature difference ΔT reaches a critical value ΔTc, regular oscillation appears on the open surface, which changes with the layer thickness h. In our experiments, high-precision sensor system is applied to measure the surface displacements. Critical temperature differences of the oscillations are discussed as well as the coupled driven forces in our study. Surface deformation is analyzed by none-dimensional method and the influence of environmental temperature is also concerned. Additionally, approximate layer thickness range is deduced when strong signals happened.
; 段俐
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