Defects of Benard cell on a propagating front

doi:10.1063/1.5126355

IMECH-IR > 微重力重点实验室

	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
通讯作者	Duan, Li(duanli@imech.ac.cn) ; Kang, Qi(kq@imech.ac.cn)
发表期刊	PHYSICS OF FLUIDS
	2020-02-01
卷号	32 期号:2 页码:10
ISSN	1070-6631
摘要	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
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000515658400001
关键词[WOS]	CONVECTION ; DYNAMICS ; FLUID ; PHASE
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	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
项目资助者	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
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Duan, Li ; Kang, Qi
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/81560
专题	微重力重点实验室
作者单位	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
推荐引用方式 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.
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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