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Experimental Study on Effect of Boiling Heat Transfer by Ultrasonic Vibration  

Na Gee-Dae (Department of Mechanical Design Engineering, Chosun University)
Oh Yool-Kwon (Department of Mechatronics Engineering, Chosun University)
Yang Ho-Dong (Department of Precision Mechanical Engineering, Chosun University)
Publication Information
Journal of Energy Engineering / v.15, no.1, 2006 , pp. 35-44 More about this Journal
Abstract
This study experimentally investigates effect of boiling heat transfer when ultrasonic vibration was applied. Under the wall temperature condition, temperature distribution in a cavity was measured during the boiling process and heat transfer coefficient of convection, sub-tooled boiling and saturated boiling states were measured with and without ultrasonic vibration, respectively. Also, the profiles of the pressure distribution in acoustic field measured by a hydrophone were compared with the augmentation ratios of heat transfer calculated by local heat transfer coefficient. Result of this study, heat transfer coefficient and augmentation ratio of heat transfer is higher with ultrasonic waves than without one. Especially, augmentation ratio of heat transfer is more increased the convection state than sub-cooled boiling and saturated boiling states. Acoustic pressure is relatively higher near ultrasonic transducer than other points where is no installed it and affects the augmentation ratio of heat transfer.
Keywords
Boiling heat transfer; Augmentation ratio or heat transfer; Heat transfer coefficient; Acoustic pressure; Ultrasonic vibration;
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