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Title: A phase field study of the thermal migration of gas bubbles in UO2 nuclear fuel under temperature gradient

Abstract

Phase field models are developed to study the gas bubble migration in uranium dioxide nuclear fuel in which a large temperature gradient exists during the operation. In this work, thermal diffusion mechanism for nanosized gas bubbles and vapor transport process for micron-sized gas bubbles are considered, respectively. In both cases, gas bubbles migrate to the high-temperature area. Due to the velocity difference between leading and trailing edges of the gas bubbles, nanosized gas bubbles are elongated along the temperature gradient direction when thermal diffusion is dominated. Micron-sized gas bubbles are either compressed along temperature gradient direction to form lenticular shape bubbles or elongated along temperature gradient direction, depending on the location of the gas bubbles within the fuel pellet. Initial gas bubble radius has no significant effect on the gas bubble migration velocity for both thermal diffusion and vapor transport mechanisms. We notice that the shape change of the gas bubble due to vapor transport mechanism has no significant effect on the migration velocity. Furthermore, the center cavity formation is also captured by our model which is due to the migration and accumulation of lenticular gas bubbles at the center of the fuel pellet. The modeling results compare well withmore » experimental observations and theoretical analysis in the literature.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [2];  [1]
  1. Hong Kong Polytechnic Univ., Shenzhen (China). Shenzhen Research Inst.; Hong Kong Polytechnic Univ., Kowloon (Hong Kong)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE; National Natural Science Foundation of China (NSFC); Research Grants Council of Hong Kong
OSTI Identifier:
1639154
Report Number(s):
PNNL-SA-153026
Journal ID: ISSN 0927-0256; TRN: US2201848
Grant/Contract Number:  
AC05-76RL01830; 51672232; 152636/16E
Resource Type:
Accepted Manuscript
Journal Name:
Computational Materials Science
Additional Journal Information:
Journal Volume: 183; Journal ID: ISSN 0927-0256
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; gas bubble migration, quantitative phase-field modeling, temperature gradient

Citation Formats

Wang, Yafeng, Xiao, Zhihua, Hu, Shenyang, Li, Yulan, and Shi, San-Qiang. A phase field study of the thermal migration of gas bubbles in UO2 nuclear fuel under temperature gradient. United States: N. p., 2020. Web. doi:10.1016/j.commatsci.2020.109817.
Wang, Yafeng, Xiao, Zhihua, Hu, Shenyang, Li, Yulan, & Shi, San-Qiang. A phase field study of the thermal migration of gas bubbles in UO2 nuclear fuel under temperature gradient. United States. https://doi.org/10.1016/j.commatsci.2020.109817
Wang, Yafeng, Xiao, Zhihua, Hu, Shenyang, Li, Yulan, and Shi, San-Qiang. Fri . "A phase field study of the thermal migration of gas bubbles in UO2 nuclear fuel under temperature gradient". United States. https://doi.org/10.1016/j.commatsci.2020.109817. https://www.osti.gov/servlets/purl/1639154.
@article{osti_1639154,
title = {A phase field study of the thermal migration of gas bubbles in UO2 nuclear fuel under temperature gradient},
author = {Wang, Yafeng and Xiao, Zhihua and Hu, Shenyang and Li, Yulan and Shi, San-Qiang},
abstractNote = {Phase field models are developed to study the gas bubble migration in uranium dioxide nuclear fuel in which a large temperature gradient exists during the operation. In this work, thermal diffusion mechanism for nanosized gas bubbles and vapor transport process for micron-sized gas bubbles are considered, respectively. In both cases, gas bubbles migrate to the high-temperature area. Due to the velocity difference between leading and trailing edges of the gas bubbles, nanosized gas bubbles are elongated along the temperature gradient direction when thermal diffusion is dominated. Micron-sized gas bubbles are either compressed along temperature gradient direction to form lenticular shape bubbles or elongated along temperature gradient direction, depending on the location of the gas bubbles within the fuel pellet. Initial gas bubble radius has no significant effect on the gas bubble migration velocity for both thermal diffusion and vapor transport mechanisms. We notice that the shape change of the gas bubble due to vapor transport mechanism has no significant effect on the migration velocity. Furthermore, the center cavity formation is also captured by our model which is due to the migration and accumulation of lenticular gas bubbles at the center of the fuel pellet. The modeling results compare well with experimental observations and theoretical analysis in the literature.},
doi = {10.1016/j.commatsci.2020.109817},
journal = {Computational Materials Science},
number = ,
volume = 183,
place = {United States},
year = {2020},
month = {5}
}

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