環状流路内の層流化現象に関する研究 : 第２報 内菅加熱の場合

Abstract

Experimental study was performed on convective heat transfer in annular passage in order to clarify the condition for occurrence of turbulent to laminar reverse transition. Examined Reynolds number ranged from 6000 to 10000 and nondimensional heating parameter q^+_m from 0.2×10^ to 4.5×10^ . Although most of experimental conditions in terms of nondimensional heating parameter satisfied the criteria proposed so far for circular tube flows, no definite laminarization was observed in the present study. At the region of fully developed heating, however, Nusselt number shows maximum 10% drop from the well known heat transfer correlation of variable flow properties, and rather agrees with the correlation proposed by S. Fuji et al.