The transient thermocapillary migration behavior of drops with nontrivial deformation is studied.The finite difference method is employed to solve incompressible Navier-Stokes equations coupled with the energy equation and the front-tracking method is adopted to track the moving deformable drop interface.When the drop migrates to the warm region,its deformation increases with the decrease of its average interfacial tension.In order to indicate the temperature impact on the interfacial tension,a local capillary number is introduced in this paper.It is found that,when the drop density is smaller/larger than that of the bulk fluid,the drop velocity decreases/increases with the increase of the drop deformation.
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