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首页> 外文期刊>International Journal of Heat and Mass Transfer >Collisions of water droplets in the high-temperature air
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Collisions of water droplets in the high-temperature air

机译：水滴在高温空气中的碰撞

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The paper presents experimental research findings on the integral characteristics of the interaction of water droplets in a gas heated to high temperatures. An induction heater with an internal volume of about 0.13 m~3 was used. It was fitted with quartz glass observation windows to record the characteristics of droplet motion before and after collisions. Air was used as a gas medium in the inductor. The parameters were varied in the following ranges: the air medium temperature 20-700 °C, the initial radius of droplets 0.3-0.9 mm, their velocity 0.1 -7 m/s and impact angle 0-90°. At high gas temperatures, droplets were two-phase objects, because vapor bubbles formed in their near-surface layer. Frames with four collision regimes (coalescence, separation, disruption and bounce) were recorded. There were significant differences in the transformation of the water droplet surface and in the interaction of droplets with each other at various gas temperatures in the heating chamber. It has been shown that the growth of the air temperature increases the droplet lifetime and causes them to deviate from the spherical shape. The effect of the gas temperature on the position of droplet collision boundaries was determined with due consideration of the relative linear interaction parameter and the Weber number. When the gas temperature increases, two areas may form, corresponding to the bounce of droplets on the collision regime map. Differences were established in the number and dimensions of secondary water droplets formed from the collision of two initial ones. The total surface areas of liquid before and after droplet collisions were calculated.
机译：本文介绍了对高温气体液滴相互作用的积分特性的实验研究结果。使用具有约0.13m〜3的内部体积的感应加热器。它配备了石英玻璃观测窗口，以在碰撞前后的液滴运动的特性。空气用作电感器中的气体介质。参数在以下范围内变化：空气介质温度20-700°C，初始半径0.3-0.9mm，它们的速度0.1 -7 m / s，冲击角0-90°。在高气体温度下，液滴是两相物体，因为在其近表面层中形成的蒸气气泡。记录了具有四个碰撞制度（共聚，分离，破坏和反弹）的框架。在加热室中的各种气温下，水滴表面的转化和液滴相互作用存在显着差异。已经表明，空气温度的生长增加了液滴寿命并使它们偏离球形。通过适当考虑相对线性相互作用参数和韦伯数来确定气体温度对液滴碰撞边界位置的影响。当气体温度升高时，可以形成两个区域，对应于碰撞制度图上的反弹液滴。在由两个初始碰撞中形成的二次水滴的数量和尺寸中建立了差异。计算液滴碰撞之前和之后的液体的总表面积。

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