半球状の凸底面を有する垂直円柱まわりの膜沸騰熱伝達の実験

概要

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The film boiling heat transfer around a vertical silver cylinder with a convex hemispherical bottom was investigated experimentally for quiescent water at atmosphereric pressure. The experiments have been carried out by a transient method, i.e., quenching method. The diameter of test cylinder is 32mm and the length is 48mm. The test cylinder was heated to about 600℃ in an electric furnace and then cooled in saturated and subcooled water with the immersion depth of about 100mm. The degree of liquid subcooling was varied from 0 to 35K. The film boiling heat transfer increased in terms of heat flux by 225% with an increase in 30K liquid subcooling at the wall superheating of 300K. The wall superheating and heat flux at the lower limit of film boiling increased with an increase in liquid subcooling.
長崎大学の論文