Convective Heat Transfer of the Rotational and Axial Flow between Two Concentric Cylinders

Abstract

This paper considers convective heat transter to a fiow in an amiular gap with an axial flow between a rotating inner cylinder and a stationary outer cylinder. The experimental results indicate that the heat fiow from the surface of the inner rotating cylinder is the sum of the follewing two kinds of the heat flow: one by turbulent vortices induced by rotation instead of Taylor vortices and the other by the turbulent axial flew. For turbulent vertices we have the empirical equation for the overall heat transter coeMcient when without an axial flow : -Ua-a--=o.o46(T.2･a)it3 Moreover for the tuabulent axial flow we have the empirical equation on the heat transfer coeMcient afiD-'- ==o,ois(i+2.3 DLe ) ( B: )e'`5R,.o.sp,vs Here it is shown how this correlation of summing up the two heat fiows is applicable to the wide regime of such mixed fiow.