水平円筒周りの流下液膜の凝固に関する研究 : 熱工学,内燃機関,動力など

概要

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Many kinds of the air conditioning systems with ice thermal energy storage have been proposed so far, and among them a system with a water-embedded-type ice storage vessel, in which both solidification and melting occur on heat exchanger tubes, is widely used because of its simple structure and compactness. However, the water-embedded-type ice storage vessel has a disadvantage, that is, solidification rate is very small. The use of falling water film seems to be one promising ii way of solving this disadvantage. The sensible heat in water could be quickly extracted due to high heat transfer between the solid/liquid interface and the falling water film, and the solidification rate becomes larger than that in a usual water-embedded-type ice storage vessel. In the present study, we systematically investigated the influence of tube wall temperature, film Reynolds number of the falling water and initial water temperature on the solidification rate, and a correlation between dimensionless solidified area and dimensionless time was proposed. In addition, we compared the solidification rate obtained by using the falling water film with that obtained in the usual water-embedded-type ice storage vessel. It was seen that the use of the falling water film is very effective, especially for high initial water temperatures.
一般社団法人日本機械学会の論文
2001-04-25