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| A study on a vertical falling liquid film on a uniformly heated plate with constant heat flux |
| Received:November 14, 2017 Revised:February 23, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20171114003 |
| KeyWord:constant heat flux falling liquid film linear stability analysis numerical simulation |
| Author | Institution |
| 王萌 |
清华大学 核能与新能源技术研究院, 先进核能技术协同创新中心, 教育部先进反应堆工程与安全重点实验室, 北京 |
| 刘杰斌 |
中国核电工程有限公司, 北京 |
| 姜胜耀 |
清华大学 核能与新能源技术研究院, 先进核能技术协同创新中心, 教育部先进反应堆工程与安全重点实验室, 北京 |
| 段日强 |
清华大学 核能与新能源技术研究院, 先进核能技术协同创新中心, 教育部先进反应堆工程与安全重点实验室, 北京 |
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| Abstract: |
| A three-dimensional regularized model (RM) was used to study vertical falling liquid film on a uniformly heated plate with a constant heat flux.Linear stability analysis shows that RM is applicable from small to moderate Reynolds numbers; streamwise growth rate increases as Reynolds number and Marangoni number increase,and spanwise growth rate increases as Marangoni number increases,but decreases as Reynolds number increases; for streamwise and spanwise growth rates,there exists an unstable interval of disturbance wavenumber.Three-dimensional numerical simulation shows that a random disturbance can give rise to three-dimensional rivulet structures after a sufficient evolution of the film layer,and thus heat transfer between liquid and gas is enhanced; the three-dimensional rivulet structures arise earlier and heat transfer is enhanced as long as a dominant most unstable spanwise disturbance is added to the film besides random disturbance,but the rupture of the liquid film occurs earlier; the heat transfer is enhanced and the liquid film doesn't rupture earlier under the circumstance that only a dominant most unstable streamwise disturbance is added besides random disturbances. |
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