Velocity and temperature distribution along the normal to the heat-transfer surfaces of in-reactor units under natural convection (generalization of experimental data)

An analysis of velocity and temperature distribution along the normal to the heat-transfer surfaces of in-reactor units was carried out under the conditions of natural convective heat and mass transfer. A comparison with the theoretical results, obtained by solving boundary-layer equations with the corresponding conditions, was made. The longitudinal velocity component and the temperature are presented in dimensionless form depending on the dimensionless coordinate η: 123 and \(\uptheta =(T-T_{\mathrm{\infty }})/(T_{w}-T)=f(\upeta )\). The reason for the insufficient coordination of the theoretical results with experimental data is explained along with the selection of a nondimensionalization scale for velocity and temperature. Simple generalizing dependencies on the coolant velocity and temperature distributions for natural convection conditions are presented based on the proposed approach for the selection of characteristic scales.