The Effect of Ultrasonic Vibrations on Free Convective Heat Tranfer from Heated Wire to Water

Abstract

The effect of ultrasonic vibrations on free convective heat transfer from heated wire to water was experimentally investigated. Electrically heated platinum wire was placed horizontally in a stationary sound field of which the direction was horizontal or vertical. Deionized water degassed by boiling was used as sound medium.
The effect of ultrasonic vibrations on free convective heat transfer was expressed at the ratio of heat transfer coefficient with vibration to that without vibration. In the case of degassed water, there is a maximum value of heat transfer coefficient near the maximum value of acoustic radiation pressure and there is a minimum value of heat transfer coefficient near zero radiation pressure, but the increase of heat transfer coefficient with ultrasonic vibration was small.