Evaporation phenomena in superheated atomization and its impact on the generated spray
Evaporation phenomena in superheated atomization and its impact on the generated spray
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DOI：
10.1016/j.ijheatmasstransfer.2013.05.034
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发表时间：
2013-09
影响因子：
5.2
通讯作者：
A. Günther;Karl-Ernst Wirth
中科院分区：
文献类型：
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作者：
A. Günther;Karl-Ernst Wirth
应用过热雾化（闪速雾化）工艺可以获得具有中等液滴速度的精细分散喷雾，而不需要高压或额外的气相。本文分析了喷嘴毛细管内发生的蒸发现象及其对喷雾的影响。蒸发被加强以增加过热。强化的蒸发引起相当长的喷雾，并产生较小的液滴尺寸。此外，预计液滴的质量通量和速度会降低。通过增加由气泡破裂触发的蒸汽喷射脉动的量，增加了蒸汽喷射脉动。这在声学测量中显示，其也展示了监测甚至控制过热液体的雾化的简单方法。
Applying the process of superheated atomization (flash atomization) finely dispersed sprays with moderate droplet velocities can be obtained, without the necessity of high pressure or an additional gas phase. In this paper occurring evaporation phenomena inside a nozzle capillary and their impact on the generated spray are analyzed. Evaporation is enhanced for increasing superheating. An intensified evaporation induces a considerably extended spray and smaller droplet sizes are generated. Furthermore a reduced mass flux and decreased velocity of the droplets are to be expected. By increasing the amount of vapor spray pulsation, triggered by bubble bursting, is increased. This is shown in acoustic measurements, which also demonstrate a simple way to monitor, or even control the atomization of superheated liquids.