空间科学学报2018，Vol.38Issue(3)：373-379,7.DOI:10.11728/cjss2018.03.373
环形浅液池内低Prandtl数流体超临界热毛细对流演化
Transition Process of Supercritical Thermocapillary Convection in a Shallow Annular Pool for Low Prandtl Number Fluids
摘要
Abstract
In order to understand the transition process of thermocapillary convection of low Prandtl number (Pr) fluids,a series of three-dimensional numerical simulations on thermocapillary convection of Pr =0.011 fluid in a shallow annular pool are performed.Results indicate that the flow is axisymmetric steady flow at a small Marangoni number.When Marangoni number exceeds a critical value,the flow destabilizes and bifurcates to the hydrothermal wave.In this case,the wave number decreases and the fundamental frequency increases with the increase of Marangoni number.When Marangoni number continue increasing,the hydrothermal waves are enhanced and bifurcated to the radial waves.During this transition,there exists a sharp drop of the wave number.Finally,the noise on frequency spectrum increases and behaves in multi-frequencies.Therefore,the bifurcation route of thermocapillary convection is from axisymmetric steady flow,hydrothermal wave,radial waves with one frequency to three-dimensional oscillatory flow with multi-frequencies.关键词
环形浅液池/热毛细对流/转捩途径/低Prandtl数流体/数值模拟Key words
Shallow annular pool/Thermocapillary convection/Transition route/Low Prandtl number fluid/Numerical simulation分类
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张利,李友荣,刘丽娜,吴春梅..环形浅液池内低Prandtl数流体超临界热毛细对流演化[J].空间科学学报,2018,38(3):373-379,7.基金项目
国家自然科学基金项目(11532015)资助 （11532015）
