Measurement of the Velocities of Nanoparticles in Flowing Nanofluids using the Zero-Crossing Laser Speckle Method  

作　　者：AN Qin LU Jian NI Xiao-Wu 严琴;陆建;倪晓武(Department of Applied Physics,Nanjing University of Science and Technology,Nanjing 210094)

机构地区：[1]Department of Applied Physics,Nanjing University of Science and Technology,Nanjing 210094

出　　处：《Chinese Physics Letters》2012年第4期92-95,共4页中国物理快报（英文版）

基　　金：Supported by the Natural Science Foundation of Jiangsu Province under Grant No BK2008409;the National Natural Science Foundation of China under Grant No 11174151.

摘　　要：A zero-crossing dynamic speckle method is proposed to determine the velocities of nanoparticles in nanofluids.A Gaussian laser beam is used to illuminate nanofluids in a pipe,and the dynamic speckles are detected by a spatially integrating detector with an aperture.The integrated speckle intensity signal is processed by a computer and the zero-crossing rate is counted.The velocity of the nanoparticles can be determined from its relationship to zero-crossing rate.The results show that the nanoparticles exhibit features of flowing nanofluids,and when the average velocity of the nanofluids is 53.4mm/s,the average velocity of the nanoparticles is 51.8 ± 5.1 mm/s.

关 键 词：NANOPARTICLES SPECKLE integrating 

分 类 号：TB3[一般工业技术—材料科学与工程]