Preliminary numerical study of single bubble dynamics in swirl fl ow using volume of fluid method

Zhongchun Li; Zhifang Qiu; Sijia Du; Shuhua Ding; Hui Bao; Xiaoming Song; Jian Deng

doi:https://doi.org/10.1016/j.net.2020.09.027

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자료유형: 학술저널

저자정보: Zhongchun Li (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of C) Zhifang Qiu (Nuclear Power Institute of China, Chengdu, 610041, China) Sijia Du (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of C) Shuhua Ding (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of C) Hui Bao (Nuclear Power Institute of China, Chengdu, 610041, China) Xiaoming Song (Nuclear Power Institute of China, Chengdu, 610041, China) Jian Deng (Nuclear Power Institute of China, Chengdu, 610041, China)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제53권 제4호

발행연도: 2021.4

수록면: 1,119 - 1,126 (8page)

DOI: https://doi.org/10.1016/j.net.2020.09.027

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Spacer grid with mixing vane had been widely used in nuclear reactor core. One of the main feather ofspacer grid with mixing vane was that strong swirl flow was formed after the spacer grid. The swirl flownot only changed the bubble generation in the near wall field, but also affected the bubble behaviors inthe center region of the subchannel. The interaction between bubble and the swirl flow was one of thebasic phenomena for the two phase flow modeling in fuel assembly. To obatin better understanding onthe bubble behaviors in swirl flow, full three dimension numerical simulations were conducted in thepresent paper. The swirl flow was assumed in the cylindral calculation domain. The bubble interface wascaptured by Volume Of Fluid (VOF) method. The properties of saturated water and steam at differentpressure were applied in the simulation. The bubble trajectory, motion, shape and force were obtainedbased on the bubble parameters captured by VOF. The simulation cases in the present study includedsingle 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 movedtoward the center with high velocity when the swirl magnitude was high. The largest bubble had thehighest lateral migration velocity in the present study range. The effect of pressure was small whenbubble size was the same. The prelimenery simulation result would be beneficial for better understandingcomplex two phase flow phenomena in fuel assembly with spacer grid

#Swirl flow #Spacer grid #Bubble dynamics #VOF

참고문헌 (20)

참고문헌 신청

Soon Heung Chang / 2006 / Critical heat flux enhancement / Nuclear Engineering and Technology 38(8):753~762

Seok-Kyu Chang / 2014 / Turbulent mixing in a rod bundle with vaned spacer grids : OECD/NEAeKAERI CFD benchmark exercise test / Nucl. Eng. Des 279:19~36

Dominque Legendre / 1998 / The lift force on a spherical bubble in a viscous linear shear flow / Journal of Fluid Mechanism 368:81~126

Kariyasaki / 1987 / Behavior of a single gas bubble in a liquid flow with a linear velocity profile / Proceedings of ASME-JSME Thermal Engng Joint Conf :261~267

E. A. Ervin / 1997 / The rise of bubbles in a vertical shear flow / J. Fluid Eng 119:443

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Zhongchun Li

소속기관 Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of C