期刊
ULTRASONICS SONOCHEMISTRY
卷 39, 期 -, 页码 262-271出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2017.04.021
关键词
Heat transfer enhancement; Forced convection; 2 MHz ultrasound; Acoustic streaming; PIV; Turbulence
资金
- French Alternative Energies and Atomic Energy Commission - CEA
- French Environment and Energy Management Agency - ADEME
The present work focuses on possible heat transfer enhancement from a heating plate towards tap water in forced convection by means of 2 MHz ultrasound. The thermal approach allows to observe the increase of local convective heat transfer coefficients in the presence of ultrasound and to deduce a correlation between ultrasound power and Nusselt number. Heat transfer coefficient under ultrasound remains constant while heat transfer coefficient under silent conditions increases with Reynolds number from 900 up to 5000. Therefore, heat transfer enhancement factor ranges from 25% up to 90% for the same energy conditions (supplied ultrasonic power = 110 W and supplied thermal power = 450 W). In the same time cavitational activity due to 2 MHz ultrasound emission was characterized from mechanical and chemical viewpoints without significant results. At least, Particle Image Velocimetry (PIV) measurements have been performed in order to investigate hydrodynamic modifications due to the presence of 2 MHz ultrasound. It was therefore possible to propose a better understanding of heat transfer enhancement mechanism with high frequency ultrasound.
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