Complex heat exchange of a dispersed turbulent flow in a pipe
Abstract
Combined radiative and convective heat transfer between a turbulent flow of a gaseous suspension with a moderate concentration of heavy particles and the walls of a duct is examined numerically. The particles are assumed to be uniformly distributed over the cross section of the duct, and von Karman's law of eddy viscosity is used. It is found that more convective heat transfer occurs during combined heat transfer than during purely convective transfer and that the difference may be as high as 20% at high temperatures. The results show that increasing the particle concentration at first increases the radiative heat transfer but then reduces it, because the thickening particle layers at the duct walls more strongly screen the radiation emanating from the core of the flow.
 Publication:

PMTF Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki
 Pub Date:
 January 1981
 Bibcode:
 1981PMTF...21...69G
 Keywords:

 Convective Heat Transfer;
 Ducted Flow;
 Pipe Flow;
 Radiative Heat Transfer;
 Turbulent Heat Transfer;
 Two Phase Flow;
 Nusselt Number;
 Particle Density (Concentration);
 Particle Motion;
 Suspensions;
 Wall Flow;
 Fluid Mechanics and Heat Transfer