气泡在液态铅铋合金内上升行为的数值模拟  

Numerical Simulation on Bubble Rising Behavior in Liquid Lead-bismuth Alloy

作　　者：赵云淦[1] 牛风雷[1] 单祖华[1] 

机构地区：[1]华北电力大学核科学与工程学院,北京102206

出　　处：《原子能科学技术》2015年第B05期278-282,共5页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(91326108)

摘　　要：为利用气泡提升泵的概念设计来增加铅铋合金非等温回路的自然循环能力,需对充入回路的气泡大小进行选择。气泡的初始直径能显著影响气泡提升泵提升自然循环的能力。利用VOF模型,对不同初始直径的氦气泡在液态铅铋合金中的提升作用进行了数值模拟研究。结果表明,对于单个气泡,随着初始直径增大,提升能力呈先增加后趋于不变的趋势;初始直径较大的气泡易分裂生成较小的子气泡附着在管壁上,有影响传热效率的潜在可能。研究了在静止液态铅铋合金中,不同初始直径的氦气泡上升速度和上升高度与时间的关系及气泡分裂的原因。In order to use the design conception of bubble-lift pump to enhance the natural-circulation ability of lead-bismuth alloy non-isothermal circuit, the filing loop bubble size needs to be chosen. The initial diameter of bubble has a marked impact on enhancing the natural-circulation ability for bubble-lift pump. In this paper, the VOF model was used to do a series of numerical simulations on the lifting effect of helium bubbles with different initial diameters in liquid lead-bismuth alloy. For the single bubble, the lifting ability increases firstly and then has an approximate constant with the increase of initial diameter. The bubble with a bigger initial diameter is easy to split into small hub bles which attach on the tube wall, and it might potentially affect the heat transfer effi- ciency. The rising velocity and rising height of helium bubbles with different initial diameters versus time in the static liquid lead-bismuth alloy and the cause of bubble divi- sion were studied.

关 键 词：液态铅铋合金回路 气泡提升泵 气泡上升 气泡分裂 数值模拟 

分 类 号：TL334[核科学技术—核技术及应用]