Non-Isothermal Vortex Flow in the T-Junction Pipe

Tatyana A Baranova,Andrei D Chorny,Yulia V Zhukova,Artem Skrypnik,Igor A Popov

doi:10.3390/en14217002

Abstract

The numerical simulation approach of heat carrier mixing regimes in the T-junction shows that the RANS approach is beneficial for a qualitative flow analysis to obtain relatively agreed averaged velocity and temperature. Moreover, traditionally, the RANS approach only predicts the averaged temperature distribution. This mathematical model did not consider the temperature fluctuation variations important for the thermal fatigue task. It should also be emphasized that unlike the LES approach, the steady RANS approach cannot express a local flow structure in intense mixing zones. Nevertheless, apparently the adopted RANS approach should be used for assessing the quality of computational meshes, boundary conditions with the purpose to take LES for further numerical simulation.

Highlights

IntroductionOne of the requirements of reliable assessment of heat carrier thermal and hydraulic parameters in different elements of thermal power equipment (TPE) (boilers, differentdesign steam generators, heat exchangers, pipelines, fuel elements, and other heat-loaded elements of nuclear reactor plants, etc.) is that heat loads (first of all, thermal and hydraulic) occurring in such plants can give rise to thermal fatigue and mechanical vibrations under normal TPE conditions [2]
Modern power engineering is based on using thermal power plants (TPP) operating on organic fuels, nuclear power plants (NPP)
In case of emergency situations, the greatest harm to the environment can be made by TPPs and NPPs

Summary

Introduction

One of the requirements of reliable assessment of heat carrier thermal and hydraulic parameters in different elements of thermal power equipment (TPE) (boilers, differentdesign steam generators, heat exchangers, pipelines, fuel elements, and other heat-loaded elements of nuclear reactor plants, etc.) is that heat loads (first of all, thermal and hydraulic) occurring in such plants can give rise to thermal fatigue and mechanical vibrations under normal TPE conditions [2]. Convective heat transfer processes in such elements as a rule are accompanied by temperature fluctuations. These fluctuations manifest themselves at boiling crises, unstable steam generation on heated surfaces, heat carrier flowrate fluctuations, unsteady convective transfer, etc. In combination with hydraulic load and corrosion of the heat carrier operating

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