대한설비공학회:학술대회논문집 (Proceedings of the SAREK Conference)
- 대한설비공학회 2005년도 동계학술발표대회 논문집
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- Pages.591-596
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- 2005
음향흐름에 의한 음압과 열전달 촉진과의 관계
The Relation of Enhancement Heat Transfer to Acoustic Pressure by Acoustic Streaming
- Yang, Ho-Dong (Department of Precision Mechanical Engineering, Chosun University) ;
- Oh, Yool-Kwon (Department of Mechatronics Engineering, Chosun University)
- 발행 : 2005.11.25
초록
The objectives in the present study are to investigate that the enhancement heat transfer was experimentally measured and was compared with the acoustic pressure obtained by numerical analysis. From the results of the present study, a strong Fluid motion initiated by ultrasonic vibrations can affect heat and mass transfer. This phenomenon. called acoustic streaming, clearly observed by PIV measurement leads to increase in velocity of a Fluid which is a crucial physical concept to explain the enhancement heat transfer. The heat transfer coefficient is increased with increase in the ultrasonic intensities. The largest enhancement heat transfer (about 26%) is measured at the ultrasonic intensity of 300W. Acoustic streaming results from sudden acoustic pressure variations in the liquid. The results of numerical analysis reveal that acoustic pressure is increased by 59.5% at the ultrasonic intensity of 300W. The higher acoustic pressure near four ultrasonic transducers develops more intensive flow destroying the flow instability. Also, the profiles of acoustic pressure variation are consistent with those of enhancement heat transfer.
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