Numerical Investigation of CO_2 Emission and Thermal Stability of a Convective and Radiative Stockpile of Reactive Material in a Cylindrical Pipe of Variable Thermal Conductivity

摘要

In this paper the CO_2 emission and thermal stability in a long cylindrical pipe of combustible reactive material with variable thermal conductivity are investigated. It is assumed that the cylindrical pipe loses heat by both convection and radiation at the surface. The nonlinear differential equations governing the problem are tackled numerically using Runge-Kutta-Fehlberg method coupled with shooting technique method. The effects of various thermophysical parameters on the temperature and carbon dioxide fields, together with critical conditions for thermal ignition are illustrated and discussed quantitatively.