Effect of Water Vapor to Temperature Inside Sonoluminescing Bubble

Using the model based on the homo-pressure approximation, we explain why the maximum temperature is sensitive to the ambient temperature in the single bubble sonoluminescence. The numerical simulation shows that the maximum temperature inside a sonoluminescing bubble depends on how much water vapor evaporates or coagulates at the bubble wall during the bubble shrinking to its minimum size. While the amount of water vapor inside the bubble at the initial and the final state of the compression depends on the saturated water vapor pressure which is sensitive to the ambient temperature. The lower the saturated vapor pressure is, the higher the maximum temperature is. This may lead to more general conclusion that those liquids with lower saturated vapor pressure are more favorable for the single bubble sonoluminescence. We also compare those bubbles with different noble gases, the result shows that the maximum temperatures in the different gas bubbles are almost the same for those with the same ambient temperature.