本项目针对双层流体热毛细对流不稳定性控制的问题，创新性地提出利用激光光热效应对双层流体热毛细对流进行主动调控，开展光热效应作用下双层热毛细对流热质传输特性及界面行为的数值模拟、理论分析和实验研究。发展基于Level set方法的高精度热毛细对流数值计算程序，研究双层流体热毛细对流振荡特性及界面变形规律，获得双层流体热毛细对流振荡流动与动态界面耦合特性；研究光热效应诱导热毛细对流流动特性及界面行为，诠释光热效应控制参数与热毛细对流强度和界面变形的关联规律；研究光热效应诱导热毛细对流与双层流体热毛细对流相互作用过程，揭示光热效应诱导热毛细对流与双层流体热毛细对流之间的耦合作用机理；研究光热效应对双层流体热毛细对流临界失稳条件、耗散结构及界面拓扑结构的影响，阐明光热效应对双层流体热毛细对流不稳定性调控的物理本质，为表面张力驱动对流流动控制提供理论指导。

Aiming at the control of thermocapillary convection instability in two-layer fluids, this project innovatively proposes to actively regulate the thermocapillary convection in two-layer fluids by using laser photothermal effect. The heat and mass transfer characteristics and interface behavior of two-layer thermocapillary convection under photothermal effect will be investigated by numerical simulation, theoretical analysis and experimental research. A high-precision numerical program for thermocapillary convection based on Level set method will be developed to study the oscillation characteristics and interfacial deformation law of thermocapillary convection in two-layer fluids, the coupled characteristics of thermocapillary convection oscillation flow and dynamic interface of two-layer fluids will be disclosed. The characteristics and interfacial behavior of thermocapillary convection induced by photothermal effect will be studied, and the correlation of the control parameters of photothermal effect with convective intensity and surface deformation will be clarified. The interaction process between thermocapillary convection induced by photothermal effect and double-layer thermocapillary convection will be studied, and the coupling mechanism between thermocapillary convection induced by photothermal effect and two-layer thermocapillary convection will be revealed. The influence of photothermal effect on critical instability conditions, dissipative structure and interface topological structure of two-layer thermocapillary convection will be studied, the physical essence of photothermal effect on the regulation of thermocapillary convection instability of two-layer fluids will be clarified, and this will provide theoretical guidance for the control of convection flow driven by surface tension.