Abstract This paper describes an experiment conducted to investigate thermal distribution during liquid atomization. An infrared camera was used to measure liquid temperature changes over time during atomization. Effects of device frequency, input power, and liquid viscosity on thermal distribution during surface acoustic wave (SAW) atomization were investigated, both experimentally and through simulation. We found that the temperature value of the atomizing area was higher than other areas. These results indicate that liquid heating was due to viscous dissipation of irradiated longitudinal wave energy; it was not caused by inelastic effects in the piezoelectric substrate. In the low-frequency atomization process, the increase of atomization rate was closely related to the thermal effect, but the atomization energy and the efficiency value were very low. Note that for a 30-MHz device with input power of 5.26 W, the atomization energy was 0.397 mW, and the efficiency was 0.00769%. Moreover, the viscosity had a remarkable influence on the thermal effect, not only on temperature changes, but also on the heat transfer mechanism in the liquid. To explain the thermal effect caused by radiated acoustic waves, we conducted a numerical study using finite element software. Based on the corresponding simulation results and experimental comparison with experimental results, we concluded that the energy radiated into the liquid by SAW was mainly dissipated by viscous dissipation, which caused the temperature of liquid to rise, while the energy consumed by atomization constituted a very small fraction. Finally, through the study of different adhesive layer materials, we found that the main reason for the SAW device cracking. The higher the input power, the greater the temperature difference taking place simultaneously. A SAW device using the silver paste can achieve continuous water atomization under an input RF power of 10.49 W for more than 1 h without cracking after many tests. At this input RF power, atomization rate can be achieved 0.57 ml/min. This has important practical significance for commercialization of SAW atomizers.

中文翻译：

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声表面波雾化过程中的热效应

摘要 本文描述了为研究液体雾化过程中的热分布而进行的实验。红外相机用于测量雾化过程中液体温度随时间的变化。通过实验和模拟研究了设备频率、输入功率和液体粘度对声表面波 (SAW) 雾化过程中热分布的影响。我们发现雾化区域的温度值高于其他区域。这些结果表明液体加热是由于辐射纵波能量的粘性耗散；它不是由压电基板的非弹性效应引起的。在低频雾化过程中，雾化率的增加与热效应密切相关，但雾化能和效率值都很低。请注意，对于输入功率为 5.26 W 的 30 MHz 设备，雾化能量为 0.397 mW，效率为 0.00769%。此外，粘度对热效应有显着影响，不仅对温度变化有影响，而且对液体中的传热机制也有影响。为了解释辐射声波引起的热效应，我们使用有限元软件进行了数值研究。根据相应的模拟结果和实验结果与实验结果的比较，我们得出结论，SAW辐射到液体中的能量主要通过粘性耗散而耗散，导致液体温度升高，而雾化消耗的能量构成了很小的能量。分数。最后，通过对不同粘合层材料的研究，我们发现了SAW器件开裂的主要原因。输入功率越高，同时发生的温差越大。使用银浆的SAW器件在10.49W的输入射频功率下，经过多次测试，可以实现1小时以上的连续水雾化，不开裂。在此输入射频功率下，雾化速率可达到 0.57 ml/min。这对于SAW雾化器的商业化具有重要的现实意义。49 W 超过 1 小时，多次测试后无开裂。在此输入射频功率下，雾化速率可达到 0.57 ml/min。这对于SAW雾化器的商业化具有重要的现实意义。49 W 超过 1 小时，多次测试后无开裂。在此输入射频功率下，雾化速率可达到 0.57 ml/min。这对于SAW雾化器的商业化具有重要的现实意义。