Transient cavitation is associated with which pulse characteristic?

• A. Short, High-Pressure Pulses
• B. Long, Low-Amplitude Pulses
• C. Continuous Wave At Low Frequency
• D. Very High Duty Cycle

Answer: (A)

Transient cavitation, or inertial cavitation, occurs when the ultrasonic pressure swings are large and occur in a very brief time. The brief, high-amplitude pulses create strong negative pressures during the rarefaction phase, causing microbubbles to form quickly and then collapse violently. This rapid, high-energy collapse is the hallmark of transient cavitation.

Long, low-amplitude pulses allow bubbles to enter stable, continuous oscillation rather than violently collapsing, so they’re not the pattern that drives transient cavitation. Continuous wave at low frequency provides ongoing exposure but doesn’t emphasize the short, extreme pressure excursions that produce inertial cavitation. A very high duty cycle increases exposure time overall, raising heating risk, but it doesn’t inherently produce the short, high-peak pressure conditions needed for transient cavitation.

So, the characteristic most closely linked to transient cavitation is short, high-pressure pulses.