To the question of heat transfer in the annular gap of coaxial cylindrical pipes in case of movement of viscous liquid (and/or gas) turbulent flow
The paper is devoted to the theoretical description of the dynamic and temperature fields of a turbulent flow in the gap of two coaxial cylindrical pipelines in order to determine the dimensionless coefficients of resistance in the Darcy form and heat transfer in the Nusselt form. On the basis of a modernized semi-empirical model of turbulence, their dependences on the Reynolds characteristic number, the ratio of the diameters of coaxial cylindrical pipes, the relative degrees of the pipe walls of roughness, etc., are determined. For boundary conditions of the second kind with respect to the temperature field (the ratios of specific heat fluxes on the inner walls of the gap are given), the solution of the set problem is reduced to quadratures.