Mixed Convection in The Entry Region of a Vertical Annulus with a Constant Temperature Rotating Inner Cylinder

Abstract

Laminar air flow combined convection in a vertical annulus with a constanttemperature rotating inner cylinder is treated on the basis of a developing flowmodel, and the basic differential equations are rewritten in finite difference formand solved by a computer program in Fortran. Investigation covers theranges of 0.2≤N≤0.9 , –300≤Gr/Re≤800 and 0.2≤Re2/Ta≤1000. In addition to theusual heat transfer calculations, this enables the developing velocity andtemperature fields to be studied. On the other hand , the effect of a superimposedaiding or opposing natural convection on the developing tangential velocityprofile is also investigated.