触媒による分解反応を伴う膜沸騰熱伝達に関する研究

概要

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Film boiling heat transfer of saturated methanol with decomposition reaction is investigated experimentally by using a cylindrical heater with catalytic surface. Platinum black powder which is stuck on the cylinder shows enough activity to catalyze the reaction. The heat transfer coefficient remarkably increases with the slight increase of the wall superheat and becomes about 50% higher than the Bromley's prediction of no reaction case. Such high heat transfer is considered to be due to the endothermic action and the evolution of hydrogen the thermal conductivity of which is about five times that of methanol vapor. However, once the wall superheat exceeds about 510K, the heat transfer coefficient decreases and approaches that of no reaction case. This may be due to the sintering of the catalyst used in the present study. The heat transfer coefficient which is predicted by taking account of the absorbed heat and the properties change of vapor phase due to the evolution of decomposed gases is in good agreement with the high coefficient measured by experiment.
一般社団法人日本機械学会の論文
1992-03-25