Study on void fraction distribution in the moderator cell of Cold Neutron Source systems in China Advanced Research Reactor

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• 作者：Liangxing Li ; Huixiong Li ; Jinfeng Hu ; Qincheng Bi ; Tingkuan Chen
• 关键词：Cold Neutron Source ; Bubble ; Terminal velocity ; Void fraction
• 刊名：Physica B
• 出版年：2007
• 出版时间：30 April 2007
• 年：2007
• 卷：393
• 期：1-2
• 页码：336-346
• 全文大小：578 K

文摘

A physical model is developed for analyzing and evaluating the void fraction profiles in the moderator cell of the Cold Neutron Source (CNS) of the China Advanced Research Reactor (CARR), which is now constructing in the China Institute of Atomic Energy (CIAE). The results derived from the model are compared with the related experimental data and its propriety is verified. The model is then used to explore the influence of various factors, including the diameter of boiling vapor bubbles, liquid density, liquid viscosity and the total heating power acted on the moderator cell, on the void fraction profiles in the cell. The results calculated with the present model indicate that the void fraction in the moderator cell increases linearly with heating power, and increases with the liquid viscosity, but decreases as the size of bubbles increases, and increases linearly with heating power. For the case where hydrogen is being used as a moderator, calculation results show that the void fraction in the moderator cell may be less than 30 % , which is the maximum void fraction permitted from the nuclear physics point of view. The model and the calculation results will help to obtain insight of the mechanism that controls the void fraction distribution in the moderator cell, and provide theoretical supports for the moderator cell design.