ATMOSPHERIC CONVECTION PRODUCED BY LOCAL HEATING OR COOLING OF A HORIZONTAL SURFACE

摘要

This paper is concerned with the study of steady laminar convection flows, which are produced by nonuniform Axisymmetric heating or cooling of a horizontal surface in the presence of the Carioles force. First order approximations are obtained by means of adjustable local boundary layer assumptions, which were recently introduced and applied by the authors. Velocity, pressure, and temperature fields are computed for various Prenatal, Gratify, and Eckert numbers as well as i:or various Carioles parameters. Since the radial inflow causes a cyclonic motion and the radial outflow an anticyclone motion, the local heating of a surface generates in the northern hemisphere a vortex which is counterclockwise in the lower part of the boundary layer and clockwise in the upper part. For a cooled surface the situation is reversed. Critical Gratify numbers and Carioles parameters exist beyond which the flow field becomes unstable. The tendency toward instability is decreased by the Carioles force.