TY - JOUR
TI - Verification of applicability of the two-equation turbulence models for temperature distribution in transitional flow in an elliptical tube
AU - Lopata Stanislaw
AU - Oclon Pawel
JN - Thermal Science
PY - 2019
VL - 23
IS - 14
SP - 1113
EP - 1121
PT - Article
AB - To increase the efficiency, elliptical tubes are often used in cross-flow  heat exchangers. For these kinds of heat exchangers the flow field in the  tubes exhibits irregularities. Therefore, various flow regimes can be  observed: the turbulent, the transitional, and even the laminar one.  Therefore, applying typical turbulence models for numerical calculations may  cause significant errors, when flow in the heat exchanger tubes is in the  transitional or laminar regime. Hence, the average values of flow velocities  and temperature in heat exchanger tubes can be calculated incorrectly. The  paper presents empirical verification of applying the basic two-equation  turbulence models for a transitional flow of water in an elliptical pipe of  a heat exchanger.