NATURAL-CONVECTION IN VERTICAL CONCENTRIC ANNULI UNDER A RADIAL MAGNETIC-FIELD

Exact solutions for fully developed natural convection in open-ended v ertical concentric annuli under a radial magnetic field are presented. Expressions for velocity field, temperature field, mass flow rate and skin-friction are given, under more general thermal boundary conditio ns. It is observed that both velocity as well as temperature of the fl uid is more in case of isothermal condition compared with constant hea t flux case when gap between cylinders is less or equal to radius of i nner cylinder while reverse phenomena occur when the gap between cylin ders is greater than radius of inner cylinder.