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RISS 인기검색어
- 검색키워드
- 저자 : Hongren Zhan (검색결과 3 건)
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Hongren Zhan,Shuai Li,Quan Li,Ruting Lin,Zhihao Jin,Baichen Ji,Gang Zhang,Zhigang Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
Surface modification is an important means to improve boiling heat transfer. Based on the research of surface wettability, this paper briefly describes the experimental and numerical simulation research on enhancing heat transfer of gravity heat pipe by changing surface wettability. According to the microscopic nature and mesoscopic characteristics of lattice Boltzmann method, the gas-liquid model of pseudo-potential lattice Boltzmann method was used to simulate the heat transfer process of gravity heat pipe with different wettability, and the corresponding morphology diagrams of boiling and condensation phenomena were obtained. It not only overcomes the disadvantage that it is difficult to study the bubble nucleation mechanism by arranging seed bubbles or seed droplets in advance when simulating phase transition in the macro flow model, but also overcomes the defect that Lennard-Jones potential in molecular dynamics cannot accurately describe the force between fluid molecules and wall solid molecules. Then, combining the simulated visual images and experimental results, the heat transfer mechanism of gravity heat pipes with different wetting properties is analyzed in detail. The results show that compared with ordinary heat pipes, the equivalent convection heat transfer coefficient of fully mixed wettability gravity heat pipe is increased by about 45.6 % and the total thermal resistance is reduced by about 40.2 %, which provides a theoretical basis for practical application.
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Study on boiling heat transfer of surface modification based on Lattice Boltzmann and experiments
Hongren Zhan,Shuai Li,Zhihao Jin,Gang Zhang,Lipeng Wang,Quan Li,Zhigang Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
In this paper, according to the microscopic nature and mesoscopic characteristics of lattice Boltzmann method, the boiling heat transfer of surfaces with different wettability is numerically simulated by using the pseudo-potential lattice Boltzmann method gas-liquid model. Firstly, under the local heat transfer condition, the nucleation mechanism of single bubble and the heat transfer effect of wall with different wettability are analyzed in detail through the characteristics of bubble automatic nucleation and interface automatic evolution. It not only overcomes the disadvantage that seed bubbles need to be placed in advance in the macroscopic flow model to simulate nuclear boiling, which makes it difficult to study the nucleation mechanism of bubbles, but also overcomes the disadvantage that Lennard-Jones potential in molecular dynamics cannot accurately describe the interaction between fluid molecules and solid molecules on the wall. Then, the boiling curves of non-mixed wettability surfaces are plotted by extending the scope of the study to multiple bubbles. On this basis, the bubble nucleation and heat transfer characteristics of the mixed wettability surface were studied.
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Heat transfer characteristics of single-ring closed PHP
Lipeng Wang,Yue Cai,Qianqian Zhang,Sheng Shi,Lin Wu,Hongren Zhan 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4
In order to solve the problem of heat dissipation in the current industry, a single ring closed pulsating heat pipe (PHP) was simulated in this paper. Firstly, the geometry model and numerical simulation model of single ring closed cycle PHP were established to obtain the temperature change rule of PHP and the position motion state of the vapor-plug and liquidcolumn in the tube. At the same time, a test bench was set up to verify the accuracy of the simulation results. The time series data of temperature and position of vapor-plug and liquidcolumn in PHP are extracted, and the chaotic characteristics of PHP are obtained. The results show that with the increase of the heating power, the motion state of the working fluid, the chaotic attractor and Lyapunov index have all changed significantly. The results provide a foundation for further research on the features and mechanism of PHP.
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