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首页> 外文期刊>International Journal of Heat and Mass Transfer >Quantitative experimental determination of evaporation influencing factors in single droplet levitation
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Quantitative experimental determination of evaporation influencing factors in single droplet levitation

机译：单滴悬浮中蒸发影响因素的定量实验测定

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摘要

Acoustic levitation has been used successfully as a model system for spray polymerization processes and the determination of particle morphology. The experimental extension for the investigation of heat and mass transfer in levitated liquid droplets requires much more effort. In order to enable the levitation method as a universal tool for the tracking of heat and mass transfer, influencing experimental parameters and their effect on relevant characteristics like droplet deformation, temperature and surrounding flow field were analyzed. These parameters were elucidated experimentally to reveal their mutual dependencies. It was shown that the evaporation rate is affected by the aspect ratio of a droplet, which is directly correlated with its wet-bulb temperature. This was primarily explained by varying acoustic flow field patterns based on classical fluid mechanics, gas velocities and acoustic boundary layer thicknesses, which were visualized and quantified by particle image velocimetry. In order to study the wet-bulb temperature, thermocouple measurements on the levitated droplet were performed. It turned out, that the wet-bulb temperature is dependent on the power input and the resulting sound pressure level as it changes the acoustic field around the droplet. Moreover, the temperature measurement revealed the necessity to establish a temperature correction to account for heat conduction effects along the thermocouple shaft into the droplet. The illustrated experimental setup and measurement procedure is supposed to provide guidelines for the experimental determination of heat and mass transfer in evaporating droplets.
机译：声悬浮已成功地用作喷雾聚合过程和颗粒形态测定的模型系统。为了研究悬浮液滴中的传热和传质，需要进行更多的实验。为了使悬浮法成为跟踪热量和质量传递的通用工具，分析了影响实验参数及其对相关特性（如液滴变形，温度和周围流场）的影响。通过实验阐明了这些参数，以揭示它们的相互依赖性。结果表明，蒸发速率受液滴长径比的影响，液滴的长径比与其湿球温度直接相关。这主要是通过基于经典流体力学，气体速度和声边界层厚度改变声流场模式来解释的，这些声场场模式通过粒子图像测速法进行可视化和量化。为了研究湿球温度，对悬浮液滴进行了热电偶测量。事实证明，湿球温度取决于功率输入以及所产生的声压级，因为它改变了液滴周围的声场。此外，温度测量表明必须建立温度校正，以解决沿热电偶轴进入液滴的热传导效应。所示的实验设置和测量程序应为实验确定蒸发液滴中的传热和传质提供指导。

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