纳米颗粒固液二相流实时观测  

Real-Time Observation on a Nanoparticle-Liquid Two-Phase Flow

作　　者：闫晶[1] 雒建斌[1] 徐学锋[1] 

机构地区：[1]清华大学摩擦学国家重点实验室,北京100084

出　　处：《纳米技术与精密工程》2005年第2期117-121,共5页Nanotechnology and Precision Engineering

基　　金："973"计划项目(2003CB716201);国家自然科学基金重大项目(50390060).

摘　　要：为实现对固液二相流中纳米颗粒运动的实时观测,选用荧光显微镜、CCD摄像机及注射泵等设计了一套纳米颗粒固液二相流观测设备.采用此设备对纳米颗粒尺寸为55nm左右的小管道固液二相流动实现了实时观测.实验结果表明,纳米颗粒在小管道中的流动与流体运动基本一致,随动性较好,在流体小管道流动的研究中可作为示踪粒子使用.随着流量的增加,纳米颗粒运动速度出现分散分布.溶液中纳米颗粒浓度对二相流管道横截面上的流动状况有一定影响.In order to get the real-time observations on nanoparticle-liquid two-phase flow, an experimental apparatus with a fluorescence microscope, a CCD camera, a syringe pump and other assistant equipment was setup. Using the experimental apparatus, the two-phase flow in which diameter of the solid phase is about 55 nm was observed. Experimental results indicated that nanoparticles followed the flow in micro channels. So in the research of microfluid, nanoparticles can be used as the seeds to track the flow of liquid. With the increase of flow the velocities of particles became dispersed. The solid concentration had some effects on the speed distribution in the cross section of the channel.

关 键 词：固液二相流 纳米颗粒 实时观测 CCD摄像机 荧光显微镜 颗粒运动 二相流动 颗粒尺寸 观测设备 流体运动 示踪粒子 管道流动 流动状况 颗粒浓度 运动速度 小管道 注射泵 随动性 横截面 

分 类 号：TB383[一般工业技术—材料科学与工程]