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大 Prandtl 数大尺寸液桥浮力-热毛细对流地面实验研究
Alternative TitleGround Experiments Of Bouyant Thermocapillary Convection Of Large Scale Liquid Bridge With Large Prandtl Number
王佳; 吴笛; 段俐; 康琦
Source Publication力学学报
Abstract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。
Other AbstractThermocapillary-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.
Keyword浮力-热毛细对流 大尺寸液桥 流动模式 热流体波 转捩
Indexed ByEI ; CSCD
Funding Organization资助项目:载人航天工程项目空间实验项目 TG-2 大 Prandtl 数液桥热毛细对流空间实验
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Document Type期刊论文
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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.
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