Abstract
The wetting of atomic/molecular liquid under the ultrasonic vibration were studied for probing of the spreading driving force. Under the ultrasonic vibration, the wettability can be improved significantly. The momentum transfer at the liquid/solid interface can be a driving force for spreading, but it is invalid for the contact angles in a range near 90° for the non-wetting systems. The ultrasonic vibration induced the liquid/vapor interface roughening (i.e., the capillary wave at liquid/vapor interface) also can be a source of driving force. The spreading depended on the physic property of liquid, especially depended on the capillary wave on the surface of liquid. Therefore, in the application of ultrasonic-assisted brazing, the improved wettability by the ultrasonic vibration may be mainly caused by the mentioned physical factors rather than the chemical reaction at the liquid/solid interface.
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