衝突噴流を用いた高温面の非定常冷却 : 滞在時間と濡れ開始温度について(熱工学,内燃機関,動力など)

概要

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An experiment study has been conducted to elucidate characteristics of transient heat transfer during quenching a hot cylindrical block with an impinging water jet. The experiment was done at atmospheric pressure for the following condition: an initial block temperature of 250 to 400℃, a subcooling of 5-80K, a jet velocity of 3-15m/s, and a nozzle diameter of 2mm. It is observed that in a certain case the hot surface is hardly wetted immediately after the water jet impinges on it. After some times named resident time, the wetting of the surface starts and the position of wetting moves forwards. The quench of the hot block also starts with the movement of the wetting position. The resident time when the wetting location starts spreading after the jet impingement is one of the most importance and can be predicted by a proposed correlation. In addition, a correlation to predict the surface temperature at the resident time is proposed.
社団法人日本機械学会の論文
2005-06-25