ON THE EXTENT OF THERMAL CONDUCTION REGIME IN ENCLOSED VERTICAL PLANE FLUID LAYERS

Abstract

For fluid enclosed between two vertical plates at different temperatures, transport equations were integrated numerically by Poots'' method, and a correlation Eq.(18) derived for estimation of Nunumber. Moreover, a criterion of the conduction region were derived, using Eq.(18). Especially in the region of L/d≥20, the criterion may be expressed by Eq.(20).This criterion agreed with experiments of Eckert et al and Elder, and is applied as a better criterion than Batchelor''s.