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首页> 外文期刊>International Journal of Heat and Mass Transfer >Wave - Thermocapillary effects in heated liquid films at high Reynolds numbers
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Wave - Thermocapillary effects in heated liquid films at high Reynolds numbers

机译：波-高雷诺数的加热液膜中的热毛细管效应

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摘要

The temperature distributions and wave characteristics of the water film flowing down a vertical plate with a heater of 100 × 150 mm at Re = 150,300,500 are studied. The field of film thicknesses at different heat flux values was measured using the fluorescence method. The temperature field on the film surface was measured by an infrared scanner. The experimental data were obtained for variations in temperature over the liquid film surface with time during the propagation of waves. Thermocapillary forces that arise on heating lead to the formation of rivulets separated by thin layer troughs, with three-dimensional (3D) waves propagating over the crests of rivulets. Averaging of measurements allowed the values of the transverse film deformation and distance between the rivulets to be determined. In the interrivulet zone Marangoni number increases with a rise of the heat flux. The amplitudes of 3D waves in a water film flowing down a vertical heated plate have been measured. The film thickness and 3D wave amplitudes on the heater grow with increasing heat flux and distance downstream the flow, but the relative wave amplitude remains unchanged. In the heated regions between rivulets, the relative amplitude of waves increases with decreasing average thickness (or local Reynolds number). Analysis of results obtained for large Reynolds numbers showed that the relative amplitudes of waves in the regions between rivulets at high heat fluxes are much greater than those for small Reynolds numbers and in isothermal falling films. Two mechanisms of thermocapillary forces influence on the motion of the wavy liquid film are marked. For the first time, the exhibition of such a strong thermocapillary effects is revealed in the heated liquid film at high Reynolds numbers.
机译：研究了在Re = 150,300,500时，用100×150 mm的加热器在垂直板上向下流动的水膜的温度分布和波动特性。使用荧光方法测量在不同热通量值下的膜厚度的场。通过红外扫描仪测量膜表面上的温度场。获得了在波传播期间液膜表面上的温度随时间变化的实验数据。加热时产生的热毛细作用力导致形成由薄层槽隔开的小流，在小流的波峰上传播三维（3D）波。测量的平均允许确定横向膜变形的值和小铆钉之间的距离。在间隙区域，马兰哥尼数随着热通量的增加而增加。已经测量了在垂直加热板上流下来的水膜中3D波的振幅。加热器上的薄膜厚度和3D波振幅随着热通量和流下游距离的增加而增加，但相对波振幅保持不变。在小铆钉之间的加热区域中，波的相对振幅随着平均厚度（或局部雷诺数）的减小而增加。对大雷诺数的结果进行的分析表明，在高热通量下，小铆钉之间的区域中波的相对振幅要比小雷诺数和等温降膜中的相对振幅大得多。标记了热毛细作用力影响波浪状液膜运动的两种机理。在加热的液膜中以高雷诺数首次显示出如此强大的热毛细管效应。

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