Identyfikacja współczynnika wnikania ciepła w obszarze przejścia laminarno-turbulentnego

The paper presents a theoretical-experimental method of determinate of heat transfer coefficient at internal and external surface of PEX-polyethylene pipe. In the analysis the turbulent exchange of momentum and heat at the inlet region of the circular pipe were taken into consideration. Moreover, in numerical calculations the measured values of parameters of the flow were used, particularly thermal boundary condition at the external surface of the pipe. The obtained results of numerical calculations were compared with corresponding results avaiable in literature, obtaining a high degree of their conformity.