激光光热效应对双层流体热毛细对流主动调控机理研究  

Study on the Active Regulation Mechanism of Laser Photothermal Effect on Thermocapillary Convection of Double-layer Fluid

作　　者：段文豪 周小明 陈启生[2] DUAN Wenhao;ZHOU Xiaoming;CHEN Qisheng(College of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190)

机构地区：[1]河海大学机电工程学院,常州213022 [2]中国科学院力学研究所,北京100190

出　　处：《空间科学学报》2024年第2期335-345,共11页Chinese Journal of Space Science

基　　金：国家自然科学基金项目资助(51976080)。

摘　　要：热毛细对流不稳定性的主动调控是微重力流体力学和传热传质学领域的前沿问题,为了实现双层流体热毛细对流不稳定性的有效控制,提出利用激光光热效应对其不稳定性进行主动调控,并模型化研究了激光光热效应参数(激光束位置、激光功率和光斑尺寸)对双层热毛细对流不稳定性的调控作用机理.计算结果显示,激光功率和光斑尺寸的调整能够显著改变双层流体热毛细对流的对流涡结构,并减小温度波的振动幅度.在一定工况下,热源附近温度波动范围由0.7 K变为0.1 K,变化显著;随光斑尺寸增大,温度振荡幅度先减小后增大.激光位置的调整能够影响液层局部对流涡的位置,进而改变激光位置两侧对流强度,实现局部区域的振荡不稳定流动的控制,通过光热效应参数的合理选择,可以实现对双层流体热毛细对流的有效控制.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.

关 键 词：双层流体 热毛细对流 光热效应 主动调控 

分 类 号：O351.2[理学—流体力学]