| 过热液体R134a中活塞效应的数值模拟 |
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| 作者姓名： | 黄彩凤 李玉华 李志刚 郭朝红 姜玉雁 |
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| 作者单位： | 1. 中国科学院大学, 北京 100049;
2. 中国科学院工程热物理研究所, 北京 100190 |
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| 基金项目： | 国家自然科学基金（51306186）资助 |
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| 摘 要： | 针对一维密闭腔体中过热液体R134a的传热过程建立数学模型，并进行数值模拟研究。对计算区域左边界进行阶跃温差为1 K的等温加热，通过求解可压缩流体控制方程组，成功捕捉到流体内部存在的活塞效应，计算出其当量热导率，并分析过热程度对活塞效应的影响规律。结果表明：过热液体R134a中活塞效应当量热导率显著高于工质自身热导率，利用活塞效应可传递更高的热流密度，并实现更高的传热速率。
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| 关 键 词： | 过热液体 R134a 活塞效应 数值模拟 |
| 收稿时间： | 2017-02-10 |
| 修稿时间： | 2017-04-26 |
Numerical simulation of the piston effect in superheated liquid R134a |
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| Authors: | HUANG Caifeng LI Yuhua LI Zhigang GUO Chaohong JIANG Yuyan |
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| Institution: | 1. University of Chinese Academy of Sciences, Beijing 100049, China;
2. Institute of Engineering Thermal Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | In this paper, a model of one-dimensional cavity filled with meta-stable superheated liquid R134a is built to investigate influence of the piston effect (PE). Numerical simulation method is used in boundary condition of a temperature jump. The PE is caught in the superheated liquid by solving energy transport equation of compressible fluid. Then the equivalent thermal conductivity of PE is calculated. Furthermore, the influence of liquid superheat degree on piston effect is investigated. The higher the superheat degree is, the stronger the PE effect is. In conclusion, the piston effect is capable of carrying higher heat flux and speeding up thermal equilibrium in superheated liquid of R134a. The equivalent thermal conductivity of PE is obviously superior to pure heat conduction, and the equivalent thermal conductivity of PE is tripled. |
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| Keywords: | superheated liquid R134a piston effect numerical simulation |
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