Effect of tilt angle on the stability of free convection heat transfer in an upward-facing cylindrical cavity: Numerical analysis
The critical cavity tilt angle is defined to mark the stability of free convection heat transfer shifting from steadiness to unsteadiness with the cavity rotating from sideward to vertical upward. In this article, taking a cylindrical cavity subjected to constant heat flux as object, experiments wer...
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| Published in | International journal of thermal sciences Vol. 107; pp. 13 - 24 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
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Elsevier Masson SAS
01.09.2016
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| Abstract | The critical cavity tilt angle is defined to mark the stability of free convection heat transfer shifting from steadiness to unsteadiness with the cavity rotating from sideward to vertical upward. In this article, taking a cylindrical cavity subjected to constant heat flux as object, experiments were firstly performed to show the possible reason why the unsteady free convection heat transfer was not discovered in previous experimental studies. Afterwards, on the basis of three-dimensional steady and unsteady simulation models, the concept of critical cavity tilt angle was proved and its magnitude was determined. For the compromising of computation cost and accuracy, the verified steady state model was employed to analyze the effects of aperture ratio and heat flux on critical cavity tilt angle. Also the importance of selecting appropriate monitoring parameters was detailed. Results show that in general, the critical cavity tilt angle increases with decreasing aperture ratio or increasing heat flux for partially open cavities. Remarkable differences may occur among scenarios having different monitoring parameters. Hence, to identify the critical cavity tilt angle accurately, more parameters, especially those inside the cavity should be taken into account.
•Identified stability change of free convection heat transfer caused by tilt angle.•Explained why the critical cavity tilt angle was not found in previous experiments.•Numerical analysis on the effects of aperture ratio and heat flux.•Selecting appropriate monitoring points inside the cavity is of great importance. |
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| AbstractList | The critical cavity tilt angle is defined to mark the stability of free convection heat transfer shifting from steadiness to unsteadiness with the cavity rotating from sideward to vertical upward. In this article, taking a cylindrical cavity subjected to constant heat flux as object, experiments were firstly performed to show the possible reason why the unsteady free convection heat transfer was not discovered in previous experimental studies. Afterwards, on the basis of three-dimensional steady and unsteady simulation models, the concept of critical cavity tilt angle was proved and its magnitude was determined. For the compromising of computation cost and accuracy, the verified steady state model was employed to analyze the effects of aperture ratio and heat flux on critical cavity tilt angle. Also the importance of selecting appropriate monitoring parameters was detailed. Results show that in general, the critical cavity tilt angle increases with decreasing aperture ratio or increasing heat flux for partially open cavities. Remarkable differences may occur among scenarios having different monitoring parameters. Hence, to identify the critical cavity tilt angle accurately, more parameters, especially those inside the cavity should be taken into account. The critical cavity tilt angle is defined to mark the stability of free convection heat transfer shifting from steadiness to unsteadiness with the cavity rotating from sideward to vertical upward. In this article, taking a cylindrical cavity subjected to constant heat flux as object, experiments were firstly performed to show the possible reason why the unsteady free convection heat transfer was not discovered in previous experimental studies. Afterwards, on the basis of three-dimensional steady and unsteady simulation models, the concept of critical cavity tilt angle was proved and its magnitude was determined. For the compromising of computation cost and accuracy, the verified steady state model was employed to analyze the effects of aperture ratio and heat flux on critical cavity tilt angle. Also the importance of selecting appropriate monitoring parameters was detailed. Results show that in general, the critical cavity tilt angle increases with decreasing aperture ratio or increasing heat flux for partially open cavities. Remarkable differences may occur among scenarios having different monitoring parameters. Hence, to identify the critical cavity tilt angle accurately, more parameters, especially those inside the cavity should be taken into account. •Identified stability change of free convection heat transfer caused by tilt angle.•Explained why the critical cavity tilt angle was not found in previous experiments.•Numerical analysis on the effects of aperture ratio and heat flux.•Selecting appropriate monitoring points inside the cavity is of great importance. |
| Author | Shen, Zu-Guo Wu, Shuang-Ying Xiao, Lan Wang, Ke |
| Author_xml | – sequence: 1 givenname: Zu-Guo surname: Shen fullname: Shen, Zu-Guo organization: Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China – sequence: 2 givenname: Shuang-Ying surname: Wu fullname: Wu, Shuang-Ying email: shuangyingwu@126.com organization: Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China – sequence: 3 givenname: Lan surname: Xiao fullname: Xiao, Lan organization: Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China – sequence: 4 givenname: Ke surname: Wang fullname: Wang, Ke organization: Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China |
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| Keywords | Stability Numerical analysis Upward-facing cylindrical cavity Free convection heat transfer Critical cavity tilt angle |
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| Snippet | The critical cavity tilt angle is defined to mark the stability of free convection heat transfer shifting from steadiness to unsteadiness with the cavity... |
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| SubjectTerms | Apertures Camber Critical cavity tilt angle Free convection Free convection heat transfer Heat flux Heat transfer Holes Mathematical models Numerical analysis Stability Tilt Upward-facing cylindrical cavity |
| Title | Effect of tilt angle on the stability of free convection heat transfer in an upward-facing cylindrical cavity: Numerical analysis |
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