WATER CRYSTALLIZATION AT THE SUPERCOOLING BREAKDOWN
Due to the concern of global warming and ozone depletion, all sectors of refrigeration must face new challenges such as energy improvement of the processes and limitation of the environmental impact. In this context, new technologies have been developed. One of them consists in using secondary refrigerant fluid such as ice slurry. Several technologies to produce ice slurries exist nowadays. A promising alternative to the actual ice slurry production systems is the supercooling concept under development in the laboratory. It consists in lowering the temperature of a water stream below the normal freezing point without ice forming. After leaving the evaporator, the supercooled water flow is physically disturbed in order to generate ice crystals. To control the performances of such a system, information on dynamic and thermal aspects of crystallization at the supercooling breakdown is necessary. In this context the study hereafter presents work about crystal growth when supercooling breakdown occurs. In a first part, an experimental method to determine the crystal propagation rate by temperatures statements is presented. A kinetic law is established and compared with the theory of Nash and Glicksman about the crystal growth at the supercooling breakdown. In a second part, a numerical simulation, based on thermal transfer during this phenomenon, is presented. The results from simulation are then compared with the results from experiments.
Ice slurry Supercooling breakdown Ice growth rate
J.P.RIBEIRO M.STRUB J.P.BEDECARRATS F.STRUB
Laboratoire de Thermique, Energétique et Procédés (LaTEP) Avenue de l’Université - BP 1155 - 64013 PAU CEDEX – France
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）