A numerical investigation of radiationdriven gas flow above a subliming surface
Abstract
A numerical investigation of the steady gas flow and heat/mass transfer above a subliming surface heated by thermal radiation from above is presented. A twodimensional finitedifference code utilizing primitive variables and the SIMPLER algorithm was developed to compute the gas flow patterns and temperature distributions for different radiation rates, surface absorptivities, and gas scattering albedos. The problem studied is the sublimation of dry ice by a infrared heater from above which was being used to simulate the gas flow above a burning solid propellant. Computed velocity and temperature profiles show strong buoyancy effects in the flow, especially at low radiation rates. The influence of surface absorption on the thermal and flow fields is limited to the neighborhood of the subliming surface. Variation in scattering albedo has little effect on the gas temperature profile. Sublimation rate increases almost linearly with the increase in radiation flux intensity. Increasing surface absorptivity can enhance surface sublimation more efficiently.
 Publication:

AIAA, Aerospace Sciences Meeting
 Pub Date:
 January 1990
 Bibcode:
 1990aiaa.meetZ....R
 Keywords:

 Computational Fluid Dynamics;
 Gas Flow;
 Radiative Heat Transfer;
 Solid Propellant Combustion;
 Solidified Gases;
 Sublimation;
 Absorptivity;
 Carbon Dioxide;
 Combustion Stability;
 Finite Difference Theory;
 Numerical Flow Visualization;
 Temperature Distribution;
 Fluid Mechanics and Heat Transfer