The influence of ultrasonic waves on ice and THF hydrate formation

In this work, the influence of ultrasonic waves was investigated on ice and THF/H۲O hydrate formation. The experiments were carried out under ambient pressure, with ultrasonic power ranging from ۰ to ۲۸۸W and irradiation temperature ranging from ۶ to ۱۲℃. The effect of the ultrasonic waves with a frequency of ۲۵ kHz was analyzed on the induction time and freezing point. The results indicate that ultrasonic waves increase the nucleation temperature of THF/H۲O solution and decrease the induction time. Likewise, an optimal temperature was selected as irradiation temperature. It was observed that lower temperatures, or the closest temperature to equilibrium temperature of ice (۰ ºC) and THF/H۲O hydrate (۴.۴°C), were considered the most suitable temperature for ultrasonic radiation. At lower power levels of ultrasonic waves, both ice and THF/H۲O hydrate formation were reduced due to prolonged irradiation and extra heat generation. Therefore, ultrasonic irradiation at ۵۰% and ۷۰% duty cycles was employed to mitigate heat generation. Subsequently, it was demonstrated that utilizing ultrasonic waves with a duty cycle of ۷۰% promoted the process of hydrate formation.

کلیدواژه ها:

Ultrasonic ، Tetrahydrofuran ، Induction time ، Crystallization ، Irradiation optimal temperature