Dehane Aissa, Merouani Slimane, Chibani Atef, Hamdaoui Oualid, Yasui Kyuichi, Ashokkumar Muthupandian
Laboratory of Environmental Process Engineering, Department of Chemical Engineering, Faculty of Process Engineering, University Constantine 3 Salah Boubnider, P.O. Box 72, 25000 Constantine, Algeria.
Laboratory of Environmental Process Engineering, Department of Chemical Engineering, Faculty of Process Engineering, University Constantine 3 Salah Boubnider, P.O. Box 72, 25000 Constantine, Algeria.
Ultrasonics. 2022 Dec;126:106824. doi: 10.1016/j.ultras.2022.106824. Epub 2022 Aug 19.
An alternative semi-empirical technique is developed to determine the number density of active cavitation bubbles (N) formed in sonicated solutions. This was achieved by relating the acoustic power supplied to the solution (i.e., determined experimentally) to the released heat by a single bubble. The energy dissipation via heat exchange is obtained by an advanced cavitation model accounting for the liquid compressibility and viscosity, the non-equilibrium condensation/evaporation of water vapor, and heat conduction across the bubble wall and heats of chemical reactions resulting within the bubble at the collapse. A good concordance was observed between our results and those found in the literature. It was found that the number of active bubbles increased proportionally with a rise in ultrasound frequency. Additionally, the increase of acoustic intensity increases the number of active bubbles, whatever the sonicated solution's volume. On the other hand, it was observed that the rise of the irradiated solution volume causes the number of active bubbles to be reduced even when the acoustic power is increased. A decrease in acoustic energy accelerates this negative impact.
开发了一种替代的半经验技术来确定超声处理溶液中形成的活性空化气泡的数密度（N）。这是通过将提供给溶液的声功率（即通过实验确定）与单个气泡释放的热量相关联来实现的。通过一个先进的空化模型获得通过热交换的能量耗散，该模型考虑了液体的可压缩性和粘度、水蒸气的非平衡凝结/蒸发、跨气泡壁的热传导以及气泡崩溃时气泡内发生的化学反应热。我们的结果与文献中的结果之间观察到了良好的一致性。发现活性气泡的数量随超声频率的升高成比例增加。此外，无论超声处理溶液的体积如何，声强的增加都会增加活性气泡的数量。另一方面，观察到即使增加声功率，照射溶液体积的增加也会导致活性气泡数量减少。声能的降低会加速这种负面影响。
