| Defects of Benard cell on a propagating front | |
Wu D(吴笛)1 ; Duan L(段俐)1,2; Kang Q(康琦)1,2
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| Corresponding Author | Duan, Li([email protected]) ; Kang, Qi([email protected]) |
| Source Publication | PHYSICS OF FLUIDS
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| 2020-02-01 | |
| Volume | 32Issue:2Pages:10 |
| ISSN | 1070-6631 |
| Abstract | Benard-Marangoni convection can be used to self-organize hexagonal convective cells, but defects easily emerge in the hexagonal pattern, which hinders its application in industry. The dynamics of front propagation and defect generation are studied in this paper. We focus especially on the onset process of a local disturbance of a hexagonal pattern, named the "nucleus." The front propagation of the nucleus has been researched through numerical simulations of a model equation and experiments. In the numerical simulations, a single nucleus can evolve into a perfect hexagon pattern under critical or subcritical conditions, and a random disturbance can generate multiple nuclei which evolve into grain boundaries. In addition, under supercritical conditions, defects also emerge as a single nucleus grows. The instability of front propagation is considered to be the mechanism for the generation of irregular patterns. The curvature effect makes the protrusion of the front have a larger velocity in supercriticality, which results in a wavy front, and defects are generated in the concave portion of the front. Also, because of the curvature effect, the front of an irregular pattern has a larger velocity than that of the regular pattern since the protrusion of the front in the irregular pattern increases the average velocity. Experiments have also been carried out by using an infrared camera to analyze front propagation. The results are qualitatively in agreement with the results of numerical simulations. Through the study of defect generation in front propagation, we put forward a method for generating a hexagon pattern which greatly reduces the number of defects. Published under license by AIP Publishing. |
| DOI | 10.1063/1.5126355 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000515658400001 |
| WOS Keyword | CONVECTION ; DYNAMICS ; FLUID ; PHASE |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | National Natural Science Foundation of China[11502271] ; Joint Funds of the National Natural Science Foundation of China[U1738116] ; Strategic Priority Research Program on Space Science ; Chinese Academy of Sciences: SJ-10 Recoverable Scientific Experiment Satellite[XDA04020405] ; Chinese Academy of Sciences: SJ-10 Recoverable Scientific Experiment Satellite[XDA04020202-05] ; China Manned Space Engineering Program |
| Funding Organization | National Natural Science Foundation of China ; Joint Funds of the National Natural Science Foundation of China ; Strategic Priority Research Program on Space Science ; Chinese Academy of Sciences: SJ-10 Recoverable Scientific Experiment Satellite ; China Manned Space Engineering Program |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Duan, Li ; Kang, Qi |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/81560 |
| Collection | 微重力重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Wu D,Duan L,Kang Q. Defects of Benard cell on a propagating front[J]. PHYSICS OF FLUIDS,2020,32,2,:10.Rp_Au:Duan, Li, Kang, Qi |
| APA | 吴笛,段俐,&康琦.(2020).Defects of Benard cell on a propagating front.PHYSICS OF FLUIDS,32(2),10. |
| MLA | 吴笛,et al."Defects of Benard cell on a propagating front".PHYSICS OF FLUIDS 32.2(2020):10. |
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| Jp2020029.pdf（7681KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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