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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal entry length in falling liquid films at high Reynolds numbers
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Thermal entry length in falling liquid films at high Reynolds numbers

机译：雷诺数高时下降的液膜的热进入长度

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摘要

A behavior of the length of thermal entry was studied experimentally in the vertically falling wavy liquid film at high Reynolds numbers with application of the field methods for thickness and temperature measurements. According to data, obtained by a high-speed IR camera, the zones, whose temperatures exceed the inlet temperature of the film, are formed at 7-10 mm from upper edge of the heater in the interrivulet area between the crests of developed 3D synchronous waves even at low heat fluxes. It was determined that in the area of rivulets, formed on the crests of 3D synchronous waves, the length of thermal entry is higher, but it decreases drastically with a rise of heat flux. Analysis of data on the film thickness, obtained by the fluorescent method, has shown that between the synchronous 3D waves in spanwise direction the average film thickness is lower. Respectively, the values of local Reynolds numbers of the film and distances before the appearance of temperature nonuniformity decrease. In these regions the effect of ther-mocapillary forces is obvious even at relatively low heat fluxes, what finally leads to a considerable decrease in the length of thermal entry.
机译：通过应用现场方法进行厚度和温度测量，对高雷诺数的垂直下落的波浪状液体膜中的热进入长度的行为进行了实验研究。根据高速红外摄像机获得的数据，在显影的3D同步波峰之间的中间区域，距加热器上边缘7-10毫米处形成温度超过胶片入口温度的区域。即使在低热通量的情况下也会产生波动已确定在3D同步波的波峰上形成的小孔区域中，热进入的长度较长，但随着热通量的增加而急剧减小。对通过荧光法获得的膜厚数据的分析表明，在跨展方向的同步3D波之间，平均膜厚较低。膜的局部雷诺数的值和温度不均匀出现之前的距离分别减小。在这些区域中，即使在相对较低的热通量下，热毛细作用力的作用也很明显，这最终导致热进入长度的显着减少。

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