大 Prandtl 数大尺寸液桥浮力-热毛细对流地面实验研究

	大 Prandtl 数大尺寸液桥浮力-热毛细对流地面实验研究
	王佳; 吴笛; 段俐; 康琦
刊名	力学学报
	2015-01-20
期号	3 页码:7
关键词	浮力-热毛细对流，大尺寸液桥，流动模式，热流体波，转捩
ISSN号	0459-1879
其他题名	Ground Experiments Of Bouyant Thermocapillary Convection Of Large Scale Liquid Bridge With Large Prandtl Number
产权排序	中国科学院力学研究所国家微重力实验室
中文摘要	开展大尺寸液桥浮力-热毛细对流地面实验，探究流场转捩的临界条件及临界状态附近的流动情况。通过粒子图像测速方法（PIV）获得流体速度场，研究液桥内部定常和转捩后的流场结构以及流体运动规律；并用红外热像仪测量液桥自由面温度分布，研究流体流动的时空演化和温度振荡。实验发现大尺寸半浮区液桥浮力-热毛细对流临界值与几何参数有关，在大 Prandtl 数情况下，流场存在由稳定态向不稳定态再到混沌的转捩过程，在临界 Maragoni 数附近，流场内会出现行波现象，流动模式也会随高径比的变化而发生变化；当继续增大 Maragoni数，流动会进入混沌状态。
英文摘要	Thermocapillary-driven convection in a large scale liquid bridge was investigated by ground experiments in this paper. We used 2cst silicone oil (Pr=28.571) ,observed the onset of liquid bridge with different aspect ratio (A=l/d) and volume, analyze the transformation of temperature oscillation frequency and phase , discussed the problems of hydrothermal waves. The column diameter of liquid bridge was 20mm. Due to the limit by gravity, we constructed bridge with 3mm-4.25mm height. With the help of five azimuthal thermocouples inserted in the bridge interior, we discovered that temperature oscillation in flow field occurs at the same time, bridges with different aspect ratio and volume have different flow mode, and with the increase of temperature difference, the frequency approximately increases linearly, oscillation phase of each temperature oscillation curve continuously changes. Bridges with different aspect ratio have different ways to chaos.
分类号	二类
收录类别	EI ; CSCD
原文出处	http://lxxb.cstam.org.cn/CN/abstract/abstract143549.shtml
语种	中文
CSCD记录号	CSCD:4691615
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/58254]
专题	力学研究所_国家微重力实验室
推荐引用方式 GB/T 7714	王佳,吴笛,段俐,等. 大 Prandtl 数大尺寸液桥浮力-热毛细对流地面实验研究[J]. 力学学报,2015(3):7.
APA	王佳,吴笛,段俐,&康琦.(2015).大 Prandtl 数大尺寸液桥浮力-热毛细对流地面实验研究.力学学报(3),7.
MLA	王佳,et al."大 Prandtl 数大尺寸液桥浮力-热毛细对流地面实验研究".力学学报 .3(2015):7.