Ultrasound heat transfer enhancement: A promising way to avoid temperature electronic failure

8th International Electronic Cooling Technology Workshop, Stockholm , 16-17 November 201

Ultrasound heat transfer enhancement: A promising way to avoid temperature electronic failure

8th International Electronic Cooling Technology Workshop, Stockholm , 16-17 November 201

Experimental study of convective heat transfer enhancement by ultrasound on a flat plate

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Heat transfer enhancement using 2 MHz ultrasound

International audienceThe 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

Intensification du transfert de chaleur sur une plaque plane verticale en convection forcée par les ultrasons : influence de la fréquence

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Etude paramétrique de l’amélioration du transfert de chaleur en présence d’ultrasons

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Similitude d’action des puissances hydraulique et ultrasonore sur le transfert thermique en convection forcée

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A regenerator pilot to evaluate the technical and economic relevance of energy storage by adiabatic compressed air energy storage by ceramic media

International audienceConsidering on one side that wind and photovoltaic generations are intermittent and non-dispatchable, and on the other side that consumption is also variable and non-exactly predictable, the only way to match them without additional peak generation in the system is to use storage. Many storage technologies can achieve this goal and we propose a focus on Adiabatic Compressed Air Energy Storage (A-CAES). Efficiency around 70% combined with scalability from 1 to 400MW provides to this technology a valuable advantage. The SEARCH project studied technical and economic aspects of an underground 200 MW A-CAES plants which daily cycled. Thermal Energy Storage, compressed air cavern, humid air and machineries were challenge to tackle. Herein, we mainly focus on the design and construction of the Thermal Energy Storage (TES), also named regenerator, using ceramic and on economic simulation for market and ancillary services