Abstract
Numerical integrations have been performed to study the influence of porosity and radiation on the combustion of spherical graphite particles in a quiescent atmosphere. Two sets of heterogeneous rate constants, one assuming no internal burning and another assuming partial internal burning, have been employed for this purpose. Based on the quasi-steady burning conditions, the numerical predictions have shown for nonporous particles the existence of a critical particle diameter below which strong burning conditions cannot be sustained. This critical particle diameter is found to be a strong function of the porosity. The influence of thermal radiation on the burning characteristics has also been examined and a complex interaction identified between surface kinetics, gas-phase kinetics, mass transport through the boundary layer and thermal radiation.
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