Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics Coupling
Heat pipe cooled reactor has the advantages of simple structure, expandability, safety and reliability, and is one of the ideal choices for space and deep sea nuclear power. However, the thermal expansion effect of the heat pipe inside the core when operating under high temperature conditions can ca...
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| Format: | Article |
| Language: | English |
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Editorial Board of Atomic Energy Science and Technology
2024-01-01
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| Series: | Yuanzineng kexue jishu |
| Subjects: | |
| Online Access: | https://yznkxjs.xml-journal.net/cn/article/doi/10.7538/yzk.2023.youxian.0057 |
| _version_ | 1797346925293338624 |
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| author | JIAO Guanghui1, DAI Lihong2, XIA Genglei1, WANG Jianjun1, PENG Minjun1 |
| author_facet | JIAO Guanghui1, DAI Lihong2, XIA Genglei1, WANG Jianjun1, PENG Minjun1 |
| author_sort | JIAO Guanghui1, DAI Lihong2, XIA Genglei1, WANG Jianjun1, PENG Minjun1 |
| collection | DOAJ |
| description | Heat pipe cooled reactor has the advantages of simple structure, expandability, safety and reliability, and is one of the ideal choices for space and deep sea nuclear power. However, the thermal expansion effect of the heat pipe inside the core when operating under high temperature conditions can cause the heat pipe to deform, which affects the heat transfer capability and operating stability of the heat pipe. Therefore, it is important to study the flow, heat transfer and mechanical properties of the high temperature alkali metal heat pipe for the safety of heat pipe cooled reactor. In this work, a multiphysics coupled model of the high temperature heat pipe was constructed using COMSOL Multiphysics finite element software. The steady-state, weakly compressible laminar flow model was used for the gas part, and the porous medium model based on Darcy's law was used for the region of wick. The flow heat transfer characteristics of the working medium inside the heat pipe and the thermal expansion effect of the pipe wall were studied by numerical simulation. The results show that the relative error between the calculated results and the experimental values of the model is less than 1%, the flow heat transfer characteristics of the high temperature heat pipe can be accurately simulated by the model in this paper. The model can reveal the heat and mass transfer mechanism inside the alkali metal heat pipe more comprehensively and obtain the pressure and velocity information inside the heat pipe that can't be measured experimentally. The pressure gradient and temperature gradient along the axial direction during the operation of the heat pipe are small and have good isothermal properties. The high temperature of the heat pipe operation will cause the wall to expand, and there is a maximum 1.75% total deformation compared to the cold state at rated power. The variation of the transmission power can significantly affect the distribution characteristics of the key parameters of the working medium inside the heat pipe. The increase of power leads to the decrease of the vapor flow rate and the increase of the liquid flow rate inside the heat pipe, which raises the operation temperature and increases the deformation of the wall at the same time. During engineering fabrication and assembly, improper control of heat pipe deformation may result in excessive stress values at the heat pipe and reactor core assembly connection, and the effect of heat pipe deformation needs to be considered to improve the operational stability of the heat pipe reactor. |
| first_indexed | 2024-03-08T11:40:11Z |
| format | Article |
| id | doaj.art-41a28fc0647c42c29b14b761c3c87a53 |
| institution | Directory Open Access Journal |
| issn | 1000-6931 |
| language | English |
| last_indexed | 2024-03-08T11:40:11Z |
| publishDate | 2024-01-01 |
| publisher | Editorial Board of Atomic Energy Science and Technology |
| record_format | Article |
| series | Yuanzineng kexue jishu |
| spelling | doaj.art-41a28fc0647c42c29b14b761c3c87a532024-01-25T06:37:43ZengEditorial Board of Atomic Energy Science and TechnologyYuanzineng kexue jishu1000-69312024-01-01581606810.7538/yzk.2023.youxian.0057Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics CouplingJIAO Guanghui1, DAI Lihong2, XIA Genglei1, WANG Jianjun1, PENG Minjun101. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China; 2. China Ship Development and Design Center, Wuhan 430064, ChinaHeat pipe cooled reactor has the advantages of simple structure, expandability, safety and reliability, and is one of the ideal choices for space and deep sea nuclear power. However, the thermal expansion effect of the heat pipe inside the core when operating under high temperature conditions can cause the heat pipe to deform, which affects the heat transfer capability and operating stability of the heat pipe. Therefore, it is important to study the flow, heat transfer and mechanical properties of the high temperature alkali metal heat pipe for the safety of heat pipe cooled reactor. In this work, a multiphysics coupled model of the high temperature heat pipe was constructed using COMSOL Multiphysics finite element software. The steady-state, weakly compressible laminar flow model was used for the gas part, and the porous medium model based on Darcy's law was used for the region of wick. The flow heat transfer characteristics of the working medium inside the heat pipe and the thermal expansion effect of the pipe wall were studied by numerical simulation. The results show that the relative error between the calculated results and the experimental values of the model is less than 1%, the flow heat transfer characteristics of the high temperature heat pipe can be accurately simulated by the model in this paper. The model can reveal the heat and mass transfer mechanism inside the alkali metal heat pipe more comprehensively and obtain the pressure and velocity information inside the heat pipe that can't be measured experimentally. The pressure gradient and temperature gradient along the axial direction during the operation of the heat pipe are small and have good isothermal properties. The high temperature of the heat pipe operation will cause the wall to expand, and there is a maximum 1.75% total deformation compared to the cold state at rated power. The variation of the transmission power can significantly affect the distribution characteristics of the key parameters of the working medium inside the heat pipe. The increase of power leads to the decrease of the vapor flow rate and the increase of the liquid flow rate inside the heat pipe, which raises the operation temperature and increases the deformation of the wall at the same time. During engineering fabrication and assembly, improper control of heat pipe deformation may result in excessive stress values at the heat pipe and reactor core assembly connection, and the effect of heat pipe deformation needs to be considered to improve the operational stability of the heat pipe reactor.https://yznkxjs.xml-journal.net/cn/article/doi/10.7538/yzk.2023.youxian.0057alkali metal heat pipetwo-phase flow heat transfersolid mechanicsmulti-physical coupling |
| spellingShingle | JIAO Guanghui1, DAI Lihong2, XIA Genglei1, WANG Jianjun1, PENG Minjun1 Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics Coupling Yuanzineng kexue jishu alkali metal heat pipe two-phase flow heat transfer solid mechanics multi-physical coupling |
| title | Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics Coupling |
| title_full | Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics Coupling |
| title_fullStr | Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics Coupling |
| title_full_unstemmed | Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics Coupling |
| title_short | Flow Heat Transfer and Mechanical Characteristics of High Temperature Heat Pipe Based on Multi-physics Coupling |
| title_sort | flow heat transfer and mechanical characteristics of high temperature heat pipe based on multi physics coupling |
| topic | alkali metal heat pipe two-phase flow heat transfer solid mechanics multi-physical coupling |
| url | https://yznkxjs.xml-journal.net/cn/article/doi/10.7538/yzk.2023.youxian.0057 |
| work_keys_str_mv | AT jiaoguanghui1dailihong2xiagenglei1wangjianjun1pengminjun1 flowheattransferandmechanicalcharacteristicsofhightemperatureheatpipebasedonmultiphysicscoupling |