Mathematical modelling of heat transfer in a gas radiant of "dark"type

The technique and results of mathematical modelling of a complex of internal and external processes of conjugate radiant-convective heat transfer are showed in conditions of laminar long-flame combustion inside the radiating tubes under different modes of operation of the "dark" gas radiators. The conditions of the numerical experiment performed on the example of series serial products made by Sibschwank company for estimating the radiant and full efficiency factors in variable regimes are described. The results of the investigation are summarized in the form of multifactor computational dependencies obtained by the method of orthogonal planning of the first order with the change of variables by power functions. The indices of the longitudinal uniformity of the temperature distribution over the surface of the radiating tubes are quantitatively estimated when the main significant factors are varied. The conditions for the effective operation of the devices studied are substantiated, taking into account a set of basic requirements for ensuring longitudinal uniformity, energy efficiency, and not exceeding the permissible temperature of the metal wall in the zones of existence of local maxima.