AUTHOR=Wang Zhenying , Zhang Rui , Yu Ting , Liu Zhiyun , Huang Yu , Wang Jianjun , Cong Tenglong 

TITLE=Numerical Study on Laminar-Turbulent Transition Flow in Rectangular Channels of a Nuclear Reactor

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 8 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2020.00067

DOI=10.3389/fenrg.2020.00067

ISSN=2296-598X

ABSTRACT=Laminar-turbulent transition flow can be observed in the thermal engineering applications, while the flow resistance and heat transfer characteristics were not fully understood. In this work, the flow and heat transfer for laminar-turbulent transition in the rectangular channel were predicted by a four-equation transition turbulent model. A set of correlations for heat transfer coefficient in the rectangular channel were developed and implemented into the RELAP5/MOD3.1 code to make it capable for the analysis of plate-type fuel assembly with rectangular coolant channel. The improved RELAP5/MOD3.1 code was employed to analyze the SBLOCA along with SBO scenario for an integrated pressurized reactor, illustrating the effects of model modification on the evolution of the accident.