Numerical Study of the Effect of the Rolling Motion on the Subcooled Flow Boiling in the Subchannel

Yaru Li, Xiangyu Chi, Zezhao Nan, Xuan Yin, Xiaohan Ren and Naihua Wang
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Yaru Li: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Xiangyu Chi: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Zezhao Nan: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Xuan Yin: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Xiaohan Ren: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China
Naihua Wang: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China

Energies, 2022, vol. 15, issue 13, 1-26

Abstract: The marine environment may change the force on the fluid and inevitably influence bubble behavior and the two-phase flow in the reactor core, which are vital to the safety margin of a nuclear reactor. To explore the effect of the marine motion on the flow and heat transfer features of subcooled flow boiling in the reactor core, the volume of fluid (VOF) method is employed to reveal the interaction between the interface structure and two-phase flow in the subchannel under rolling motion. The variations of several physical parameters are obtained, including the transverse flow, the vapor volume fraction, the vapor adhesion ratio, and the phase distribution of boiling two-phase flow with time. Sensitivity analyses of the amplitude and the period of the rolling motion were performed to demonstrate the mechanisms of the influence of the rolling motion. We found that the transverse flow in the subchannel was mainly affected by the Euler force under the rolling motion. In contrast to the two-phase flow in the static state, the vapor volume fraction and vapor adhesion ratio show different characteristics under rolling motion. Additionally, the onset of significant void (OSV) point changes periodically under rolling motion.

Keywords: rolling motion; subcooled flow boiling; transverse flow; subchannel; VOF (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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