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Quantification of Cavitation Activity by Sonoluminescence To Study the Sonocrystallization Process under Different Ultrasound Parameters

机译:SonoLminiseCence测量空化活性,以研究不同超声参数下的SonoCrystallation过程

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In this study, both the antisolvent sonocrystallization process of sodium chloride and cavitation activity were investigated as a function of frequency (22-1080 kHz) and acoustic calorimetric power (0-30 W). For frequencies between 20 and 139 kHz, the size of the sodium chloride crystals decreased sharply with increasing power. For frequencies 647 and 1080 kHz, a certain power threshold needs to be exceeded before a decrease in the crystal size was observed. This power threshold coincided with the power threshold for sonoluminescence emission from cavitation bubbles. It was found that the onset of cavitation bubble activity, irrespective of the magnitude (measured in terms of sonoluminescence), enhanced the crystal nucleation rate and decreased crystal size. The minimum crystal size obtained was found to decrease with increasing maximum total integrated sonoluminescence intensity. The results suggest sonoluminescence could be used as a measure to evaluate the sonocrystallization process and that a greater collapse intensity would yield the smallest crystals. In addition, photographs of the sonocrystallization process are reported, suggesting a link between nonsymmetrical transient cavitation activity and crystal nucleation.
机译:在该研究中,研究了氯化钠和空化活性的抗溶解碳化合物和空化活性的函数(22-1080 kHz)和声量热功率(0-30 w)。对于20至139kHz的频率,氯化钠晶体的尺寸随着功率的增加而急剧下降。对于频率647和1080kHz,在观察到晶体尺寸的降低之前需要超过某个功率阈值。该功率阈值与空化气泡发射的功率阈值相结合。发现空化泡沫活性的发作,无论幅度如何(在声发炎程度上测量),增强了晶体成核速率和晶体尺寸下降。发现获得的最小晶体尺寸随着最大总集成的声发发光强度的增加而降低。结果表明SonoLminescence可以用作评估SonoCrystallation过程的措施,并且更大的塌陷强度会产生最小的晶体。此外,报告了单晶体化过程的照片,表明非对称瞬态空化活性和晶体成核之间的联系。

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