Sonoluminescence phenomenon of flashes of light in the liquid during the collapse of cavitation bubbles formed under the influence of powerful ultrasonic waves.
Sonoluminescence phenomenon of flashes of light in the liquid during the collapse of cavitation bubbles formed under the influence of powerful ultrasonic waves. Sonoluminescence is a side effect of cavitation.
The mechanism of sonoluminescence following. A standing ultrasonic wave in a phase of dilution in water creates a very low pressure, resulting in cavitation bubbles. First, the bubbles have small dimensions, and then there is growth – expansion under the action of tensile stresses in the fluid and simultaneously filling the dissolved gas and saturated vapor. The bubbles become a size from a few microns to tenths of a millimeter. Next, each cavitation bubble collapses (i.e., explodes), and formed short and bright flash of light. As cavitation bubbles form and collapse millions of times per second, we can observe steady light, usually bluish in color. The light has a thermal nature. The temperature in the cavitation bubble reaches several thousand degrees OS.
The phenomenon of sonoluminescence, as a rule, manifests itself in ordinary water. The presence in water of dissolved inert gas, lowering the temperature of the water greatly increase this phenomenon.
Allocate odnopozova and the multibubble sonoluminescence.
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