Laminar natural convection above a horizontal laser beam
Abstract
The steady laminar natural convective plume above a horizontal laser beam has been studied. The plume, which is caused by absorption of thermal energy from the beam, is threedimensional. The threedimensionality is a consequence of mass continuity and the variation in the thermal energy absorption in the propagation direction. Flow visualizations have verified the threedimensionality in that a significant velocity component, in a direction opposite to that of laser beam propagation, was observed. The problem is reduced by similarity analysis to a system of ordinary differential equations which are solved numerically for the Prandtl number, Pr = 1.0. Integral approximations are also presented for Pr = 0.7, 1.0, 10.0 and 100.0. The effect of Pr on the velocities, and temperature boundary layer thicknesses is discussed in detail.
 Publication:

International Journal of Heat and Mass Transfer
 Pub Date:
 April 1981
 Bibcode:
 1981IJHMT..24..685B
 Keywords:

 Free Convection;
 High Power Lasers;
 Laminar Flow;
 Light Beams;
 Plumes;
 Thermal Blooming;
 Continuous Wave Lasers;
 Fluid Dynamics;
 Mathematical Models;
 Steady Flow;
 Three Dimensional Flow;
 Fluid Mechanics and Heat Transfer