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首页> 外文会议>ASME International Conference on Energy Sustainability;ASME Heat Transfer Conference >EXPERIMENTAL STUDY OF BRINE DROPLET EVAPORATION AND CRYSTALLIZATION AT VARIOUS TEMPERATURES AND HUMIDITY USING EDB METHOD AND PENDANT DROPLET METHOD
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EXPERIMENTAL STUDY OF BRINE DROPLET EVAPORATION AND CRYSTALLIZATION AT VARIOUS TEMPERATURES AND HUMIDITY USING EDB METHOD AND PENDANT DROPLET METHOD

机译：EDB法和垂体液滴法在不同温度和湿度条件下蒸发和结晶的实验研究

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摘要

In this study, both electro-dynamic balance (EDB) method and pendant droplet method were employed to study the evaporation and crystallization process of brine droplet. The EDB setup was used to levitate the charged micrometer sized droplets to study the evaporation process. The pendant droplet method could hang millimeter sized droplet to study the crystallization process. The evaporation of brine droplets with different mass concentrations was visualized by a high speed camera under different temperatures and relative humidity in the test chamber. The results showed that EDB method could get the accurate droplet evaporation results which obeyed the classic D2-law. It was found that the evaporation was increased with the decrease of relative humidity. Due to the attractive force provided by sodium and chloride ion on water molecules, evaporation rate of brine droplet was smaller than pure water, therefore the evaporation rate decreased with the increase of mass concentration by showing a linear relationship. In addition, a salt shell could be formed at the outside of droplet which still contained some amount of salt solution inside. Consequently, the water molecules need to overcome the pressure difference inside and outside the salt shell, and diffuse through the shell for further evaporation. For a higher relative humidity, a more round shell would be formed during the evaporation, and the growth of crystallization along the filament is weaker than that of smaller relative humidity. We hope this study can provide a different perspective to the heat transfer community about the evaporation of brine droplet.
机译：本研究采用电平衡法和悬滴法研究卤水的蒸发和结晶过程。 EDB装置用于悬浮带电的微米级液滴，以研究蒸发过程。悬滴法可以将毫米大小的液滴悬挂起来以研究结晶过程。在测试室内不同温度和相对湿度下，通过高速照相机观察具有不同质量浓度的盐水液滴的蒸发情况。结果表明，EDB方法可以得到精确的液滴蒸发结果，符合经典的D2-定律。发现随着相对湿度的降低蒸发增加。由于钠和氯离子对水分子的吸引力，卤水液滴的蒸发速率小于纯水，因此蒸发速率随质量浓度的增加呈线性关系而降低。另外，可以在液滴的外部形成盐壳，该液滴仍在内部包含一定量的盐溶液。因此，水分子需要克服盐壳内部和外部的压力差，并通过壳扩散以进一步蒸发。对于较高的相对湿度，在蒸发过程中会形成一个更圆的外壳，并且沿着细丝的结晶生长要比较小的相对湿度弱。我们希望这项研究可以为传热社区提供有关盐水滴蒸发的不同观点。

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