Preliminary numerical study of single bubble dynamics in swirl flow using volume of fluid method
| Autor: | Jian Deng, Hui Bao, Xiaoming Song, Zhifang Qiu, Zhongchun Li, Du Sijia, Shuhua Ding |
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| Rok vydání: | 2021 |
| Předmět: |
Spacer grid
VOF Swirl flow Materials science 020209 energy Bubble Flow (psychology) Mixing (process engineering) Angular velocity 02 engineering and technology Mechanics Bubble dynamics lcsh:TK9001-9401 030218 nuclear medicine & medical imaging Physics::Fluid Dynamics 03 medical and health sciences 0302 clinical medicine Nuclear Energy and Engineering Nuclear reactor core 0202 electrical engineering electronic engineering information engineering Shear stress Volume of fluid method lcsh:Nuclear engineering. Atomic power Two-phase flow |
| Zdroj: | Nuclear Engineering and Technology, Vol 53, Iss 4, Pp 1119-1126 (2021) |
| ISSN: | 1738-5733 |
| DOI: | 10.1016/j.net.2020.09.027 |
| Popis: | Spacer grid with mixing vane had been widely used in nuclear reactor core. One of the main feather of spacer grid with mixing vane was that strong swirl flow was formed after the spacer grid. The swirl flow not only changed the bubble generation in the near wall field, but also affected the bubble behaviors in the center region of the subchannel. The interaction between bubble and the swirl flow was one of the basic phenomena for the two phase flow modeling in fuel assembly. To obatin better understanding on the bubble behaviors in swirl flow, full three dimension numerical simulations were conducted in the present paper. The swirl flow was assumed in the cylindral calculation domain. The bubble interface was captured by Volume Of Fluid (VOF) method. The properties of saturated water and steam at different pressure were applied in the simulation. The bubble trajectory, motion, shape and force were obtained based on the bubble parameters captured by VOF. The simulation cases in the present study included single bubble with different size, at different angular velocity conditions and at different pressure conditions. The results indicated that bubble migrated to the center in swirl flow with spiral motion type. The lateral migration was mainly related to shear stress magnitude and bubble size. The bubble moved toward the center with high velocity when the swirl magnitude was high. The largest bubble had the highest lateral migration velocity in the present study range. The effect of pressure was small when bubble size was the same. The prelimenery simulation result would be beneficial for better understanding complex two phase flow phenomena in fuel assembly with spacer grid. |
| Databáze: | OpenAIRE |
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