| 二氧化铀热导率的实验及数值模拟研究评价 |
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| 作者姓名： | 王增辉 黄潇凤 |
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| 作者单位： | 中国科学院研究生院物理科学学院, 北京100049 |
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| 基金项目： | 中国科学院研究生院院长基金资助 |
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| 摘 要： | 二氧化铀是一种稳定的陶瓷燃料,它具有熔点高和物理化学性质稳定的特性,作为核燃料二氧化铀的导热性能将直接影响核燃料芯块内的温度分布和芯块中心的最高温度,分析比较了二氧化铀热导率的实验研究结果和关联式,发现已有实验结果间的差异已经缩小.通过开展非平衡分子动力学模拟分析表明,二氧化铀热导率在中温区模拟较为准确可靠.在低温区时,需对能量输运粒子的动能计算进行量子修正;在高温区,需建立声子能量输运模型、电子气能量输运模型和光子辐射部分的能量输运模型,进一步建立二氧化铀的热导率计算程序.
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| 关 键 词： | 二氧化铀 热导率 分子动力学 |
| 收稿时间： | 2008-05-08 |
| 修稿时间： | 2008-11-05 |
Experiment and numerical simulation of thermal conductivity of uranium dioxide |
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| Authors: | WANG Zeng-Hui HUANG Xiao-Feng |
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| Institution: | College of Physical Sciences, Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Uranium dioxide is a kind of steady nuclear fuel that has the characteristic of high melting point and steady property. The thermal conductivity of uranium dioxide can directly influence the temperature distribution of nuclear fuel and the max temperature of the center of nuclear fuel. The experimental results and expression of thermal conductivity have been compared in the paper. The deviation between the experiment results has decreased. The non-equilibrium molecular dynamics simulation results are in good agreement with the experiment results in medium temperature region. In low temperature region, it is necessary to add the quantum correction to the kinetic energy computation of phonon. In high temperature region, it is needed to use the accurate potential model and build up the electron gas energy transport model and photon radiation energy transport to study the thermal conductivity well and truly for the nuclear reactor safety design and uranium dioxide engineering application. |
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| Keywords: | uranium dioxide thermal conductivity molecular dynamics |
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