微管道内几种液体流量特性实验的研究

IMECH-IR > 力学所知识产出(1956-2008)

	微管道内几种液体流量特性实验的研究
	周兴贝
导师	李战华
	2001
学位授予单位	中国科学院研究生院
学位授予地点	北京
学位类别	硕士
学位专业	流体力学
英文摘要	该文用去离子水及有机液体在内径约为25um的石英圆管内进行了流量特性实验.实验选取了水和其它几种有机液体.其中非极性有机液体为：四氯化碳、乙基苯及环已烷.分子量范围18-160，动力粘性系数0.5-1mPa·s，实验雷诺数范围Re<8.极性有机液体是异丙醇，分子量是60.1，动力黏性系数2.30mPa·s(20℃)、1.33mPa·s(40℃).所用液体的分子结构尺度均小于1nm.实验结果表明，在定常层流条件下，实验所用的几种非级性有机液体在圆管内的流量与两端压力差具有线性关系，符合经典Hagen-Poiseuille流动，而极性有机液体异丙醇则在同样压力差作用下却出现流量增大的现象.这说明非极性小分子有机液体在本实验所用微米尺度效应，其流动规律与经典理论预测有偏差.鉴于微尺度流动实验是流体力学实验中的新领域，文中还介绍了微流动实验装置、测量方法和技术，分析了微尺度流动测量误差来源及提高测量精度的措施.; Water and several organic liquids through a microchannel with diameter near 25um have been investigated experimentally. Flow rates and pressure drops were measured. The experimental Reynolds numbers are smaller than 8, the liquids molecular weights vary from 18 to 160, their viscosity dynamic are 0.5-1 mPa·s. One part of the organic liquids used in experiment are non-polar molecularity, such as CCL4, C6H5C2H5 and CeFfo, and another part is polar molecularity -iso-propanol. Their molecular scales are smaller than lnm. For the organic liquids with non-polar molecularity , the flow rates vary linearly with the different pressure drops. While polar organic liquid , such as iso-propanol, doesn't support that. The non-polar molecular organic liquids experimental results indicate that the flow characteristics are in agreement with the conventional theory of Hagen-Poiseuille, while the experimental flow rate of iso-propanol is more than the theory of Hagen-Poiseuille expected. It means the N-S equation based on continual material still functions well for the non-polar molecular liquid in the experimental conditions, but not for polar molecular liquid. We also present the microchannel experiment apparatus. The error factors and measure methods are analysed in details.
索取号	29933
语种	中文
文献类型	学位论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/24472
专题	力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	周兴贝. 微管道内几种液体流量特性实验的研究[D]. 北京. 中国科学院研究生院,2001.

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