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首页> 外文期刊>International Journal of Heat and Mass Transfer >Stability and heat transfer characteristics of unsteady condensing and evaporating films
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Stability and heat transfer characteristics of unsteady condensing and evaporating films

机译：非稳态冷凝和蒸发膜的稳定性和传热特性

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摘要

The stability and heat transfer characteristics of an unsteady condensing and evaporating n-pentane film on the underside of a cooled, flat, horizontal plate was studied experimentally. Unsteady conditions were produced by varying the system pressure in a cyclic fashion. The film was imaged using a double-pass shadowgraph system, and an embedded heat flux sensor measured the spatially averaged heat flux. Surface conditions were obtained using an inverse method. Images and data point collection were synchronized to permit direct correlation between thermal data and film behavior. The heat flux was affected by the Rayleigh-Taylor instability after an initial rise due to condensate formation. Hysteresis was observed in the heat flux over each pressure variation cycle, where the heat flux during condensation varied differently with the degree of subcooling than during evaporation. An additional study examined the film stability of non-condensing, growing films with mass addition but without thermal effects. Experiments showed that the film thickness at the point of first droplet break-off increased with increased pumping rate.
机译：实验研究了冷却，平坦，水平平板底面上不稳定冷凝和蒸发的正戊烷薄膜的稳定性和传热特性。通过以周期性的方式改变系统压力来产生不稳定的条件。使用双通道阴影图系统对胶片进行成像，并且嵌入式热通量传感器测量了空间平均热通量。使用逆方法获得表面条件。图像和数据点收集已同步，以允许热数据和胶片行为之间直接相关。由于凝结物的形成，热通量在最初升高后受到瑞利-泰勒不稳定性的影响。在每个压力变化周期的热通量中都观察到磁滞现象，其中冷凝过程中的热通量随过冷度的变化与蒸发过程中的变化不同。另一项研究检查了添加质量但无热效应的非凝结，生长薄膜的稳定性。实验表明，第一次液滴破裂时的膜厚随泵速的增加而增加。

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