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国家自然科学基金(10272107)

作品数:5 被引量:13H指数:2
相关作者:李战华李振国王化峰程万更多>>
相关机构:中国科学院力学研究所中国科学技术大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学自动化与计算机技术水利工程更多>>

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FLOW CHARACTERISTICS OF SIMPLE LIQUIDS IN MICROTUBES
<正>The test liquids including deionized water, isopropanol and carbon tetrachloride etc. are limited to simple...
Zhanhua Li
关键词:MICROTUBE
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Y型微管道中磁性纳米液体对混合率的影响被引量:1
2006年
利用流动显示手段观测了Y型微管道内含纳米磁性颗粒的液体与去离子水的混合.研究了在Re=0.5~4,磁性颗粒体积分数0.38%-1.54%时,外加静磁场(场强40 Gs)对液体混合地影响.证实了磁场作用可以使完全混合长度大大缩短.同时初步分析了Re和体积分数φ对混合长度的影响.
李振国李战华
关键词:磁性纳米颗粒静磁场
Flow characteristics of liquid with pressure-dependent viscosities in microtubes被引量:2
2006年
It is obvious that the pressure gradient along the axial direction in a pipe flow keeps constant according to the Hagen-Poiseuille equation. However, recent experiments indicated that the distribution of the pressure seemed no longer linear for liquid flows in microtubes driven by high pressure (1-30MPa). Based on H-P equation with slip boundary condition and Bridgman's relation of viscosity vs. static pressure, the nonlinear distribution of pressure along the axial direction is analyzed in this paper. The revised standard Poiseuille number with the effect of pressure-dependent viscosity taken into account agrees well with the experimental results. Therefore, the dependence of the viscosity on the pressure is one of the dominating factors under high driven pressure, and is represented by an important property coefficient α of the liquid.
Zhanhua Silber-LiHaihang CuiYuping TanPatrick Tabeling
一种PDMS薄膜型微阀的制备与性能分析被引量:8
2004年
通过厚胶光刻工艺在硅片上制备SU 8胶模板,利用该模板制备了高分子聚合物PDMS(Polydimethylsiloxane,聚二甲基硅氧烷)微流道和薄膜结构。通过对不同结构的两层PDMS的不可逆粘接得到一种简单的阀结构,在外加气源压力作用下薄膜产生变形实现对微流道的控制。实验测量了微阀的控制气源压力与被控制液体流量之间的关系,说明膜阀的开闭性能良好。根据弹性薄膜的变形理论,对影响微阀性能的参数进行了分析,并提出了几种可行的用于薄膜微阀控制的方法。
崔海航李战华靳刚
关键词:微流控PDMS
磁性纳米颗粒对微槽道液体流动的混合增强作用
2007年
为了改进微流控芯片中液体混合效率,尝试在一种液体中加入磁性纳米颗粒,增强与另外一种液体混合。在外加磁场作用下,对Y型微槽道中磁性与非磁性液体流动混合进行了实验观测,所需混合长度较无磁场时缩短了约2个数量级。利用CFD软件进行数值模拟,验证了外磁场作用下纳米磁性液体对流动混合有着明显的强化作用。
王化峰程万李战华
关键词:微流体微芯片
磁性纳米液体中的微结构
外加磁场作用下,磁性纳米液体的很多性质发生改变,例如液体中的颗粒可能会发生聚集现象,这会影响液体的流变特性。在磁流变液体中,Melle等以水动力学力和磁场力平衡为基础,给出了旋转磁场中临界链的方向和长度与Mason数的关...
李振国李战华
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INFLUENCE OF CAPILLARITY ON NANO-LITER FLOWRATE MEASUREMET WITH DISPLACEMET METHOD被引量:2
2007年
Nanoqiter flowrate measurements in micro-tubes with displacement method were performed and the effect of capillarity force on the accuracy was investigated through lab experiments and theoretical analysis in this article. The experiments were conducted under the pressure drops ranging from 1 kPa to 10 kPa in a circular pipe with a diameter of 50 pm, to give the pressure-flowrate (P-Q) relation and verify the applicability of the classical Hagen-Poiseuille (HP) formula. The experimental results showed that there existed a discrepancy between the experimental data and the theoretical values predicted by the HP formula if the capillary effect was not considered, which exceeded obviously the limit of the system error. And hence a modified formula for the relation, taking the capillary effect into account, was presented through theoretical deduction, and after the HP formula had been modified the error was proved to be less than 3%, which was permitted in comparison with the system error. It was also concluded that only by eliminating the effect of the capillary force in experiments could the original HP formula be employed to predict the pressure-flowrate relation in the Hagen-Poiseuille flow in the micro-tube.
GUO QiangCHENG RuiSILBER-LI Zhan-hua
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