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首页> 外文期刊>Journal of Heat Transfer >Enhancement of Thermocapillary Effect in Heated Liquid Films for Large Waves at High Reynolds Numbers
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Enhancement of Thermocapillary Effect in Heated Liquid Films for Large Waves at High Reynolds Numbers

机译：高雷诺数大波加热液膜中的热毛细管效应的增强

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The characteristics of the heated water film flowing down a vertical plate at Re = 150, 300, and 500 were studied. The fluorescence method was used for measuring the film thickness. The temperature field on the film surface was measured by an infrared scanner. The analysis of the temperature pulsations on the heated film surface was made. The high-frequency component of temperature pulsations faded at the bottom area of the heater. Part of the temperature perturbations (small waves) was removed from interrivu-lets regions (valleys) to the rivulets by transverse thermocapillary forces. At high heat flux, only largest waves with maximum ripple of temperature reached the lower edge of the heater. There is a decrease in the mean integral energy fluctuations of temperature in the interrivulets regions near the heater lower edge. In the heated regions between rivulets, the relative amplitude of large waves increases with decreasing average thickness (or local Reynolds number). The analysis of results obtained for large Reynolds numbers showed that the relative amplitudes of large waves in the regions between rivulets at high heat fluxes are much greater than those for small Reynolds numbers and in isothermal falling films. In the interrivulet zone, Marangoni number increases with a rise of the heat flux. The growth of relative amplitude of low-frequency waves in interrivulets regions helps prevent film rupture and crisis of heat transfer.
机译：研究了在Re = 150、300和500时垂直板向下流动的热水薄膜的特性。荧光法用于测量膜厚度。通过红外扫描仪测量膜表面上的温度场。对加热的膜表面上的温度脉动进行分析。温度脉动的高频分量在加热器的底部衰减。通过横向热毛细管力将部分温度扰动（小波）从小肠区域（谷）移到小肠。在高热通量下，只有温度波动最大的最大波才能到达加热器的下边缘。在加热器下边缘附近的气隙区域中，温度的平均积分能量波动减小。在小铆钉之间的加热区域中，大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，在小铆钉之间的区域中，大波的相对振幅要比小雷诺数和等温降膜中的大。在间隙区域，Marangoni数随热通量的增加而增加。间隔区域中低频波的相对振幅的增长有助于防止膜破裂和传热危机。

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