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논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
한국태양에너지학회 한국태양에너지학회 학술대회논문집 한국태양에너지학회 2004 Proceedings ISEA Asia-Pacific
발행연도
2004.10
수록면
553 - 560 (8page)

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This study presents experimental and numerical works on the enhancement of heat transfer of phase change material (PCM) when the ultrasonic vibrations were applied. The PCM was used 99% pure paraffin (n-octadecane). Two ultrasonic transducers applied the fixed, ultrasonic frequency of 40 kHz was installed at the melting cavity. Ultrasonic intensities were varied from 75W to 340W in order to investigate the effect of the ultrasonic vibrations strength on heat transfer. A particle image velocimetry (PIV) was used for the visualization of flow field inside the liquid paraffin. For the numerical analysis, SVS based on a coupled FE- BEM was used to calculate the acoustic pressure in the liquid paraffin. In the result of this work, the heat transfer coefficient is increased with increase in the ultrasonic intensities. The largest enhancement of heat transfer (about 28%) is measured at the ultrasonic intensity of 340W. Acoustic streaming results from sudden acoustic pressure variations in the liquid. The results of numerical analysis reveal that acoustic pressure is increased by 60.3% at the ultrasonic intensity of 340W. The higher acoustic pressure distribution near two ultrasonic transducers develops more intensive flow destroying the flow instability. Moreover, the profile of acoustic pressure variation is consistent with that of enhancement of heat transfer.

목차

Abstract

1. Introduction

2. Experiments

3. Numerical work

4. Results and Discussions

5.Concludon

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