噴霧冷却の研究 (第2報)
吹付け距離と被冷却物形状の影響
1964 年 30 巻 357 号 p. 803-808
詳細
1964 年 30 巻 357 号 p. 803-808
To get informations on the application of mist cooling, effects of blow distance and shape of a cooling object are discussed by measurement of the local heat transfer coefficient α. Effect of cooling object shape consists chiefly from the effect of blow angle against the surface and that of gravity upon liquid flow spreading over the surface.
(1) When mist turns into liquid flow on the outside of the scope which mist covers over the surface, strong cooling power can be get. Rate of this re-liquidification of mist comes up to 8090%.
(2) When the mist flow is under increased liquid flow rate and in the situation stated in (1), cooling area expands almost geometrically as blow distance increases. The more heat is carried away, for the maximum cooling strength (αmax) remains neary the same.
(3) Effect of gravity accompanied with inclination of the surface brings about unsymmetrical distribution of α and a change of cooling scope.
(4) With inclination of blow angle against the surface, cooling scope comes up an oval and expands. Heat quantity that flow can carry away does not so much decrease.
