Active control of thermocapillary convective instability is a frontier scientific issue in the field of microgravity hydrodynamics and heat and mass transfer.In order to achieve effective control of thermocapillary convective instability of double-layer fluid,this paper innovatively proposes to use laser photothermal effect to actively control flow,the regulation mechanism of laser photothermal effect pa-rameters(laser beam position,laser power and spot size)on the instability of double-layer thermocapil-lary convection are also studied.The calculation results show that the adjustment of laser power and spot size can significantly change the convective vortex structure in the spot area and weaken the vibra-tion amplitude of temperature wave.Under certain working conditions,the temperature fluctuation range near the heat source changes significantly from 0.7 K to 0.1 K.The amplitude of temperature os-cillation decreases first and then increases with the increase of spot size.The adjustment of the laser po-sition can affect the position of the local convection vortex in the liquid layer,and then change the con-vection intensity on both sides of the laser position,so as to realize the control of the oscillating and un-stable flow in the local region,the effective control of thermocapillary convection of double-layer fluid can be realized through the reasonable selection of photothermal effect parameters.
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