Measurement of the Transient Velocity of Nanoparticles in Flowing Nanofluids by Using the Method of Dynamic Laser Speckles
Experimental equipments are designed for the zero-crossing method of dynamic laser speckles to investigate the moving nature of nanoparticles in flowing nanofluids.After the experiments the velocity of nanoparticles in flowing nanofluids is determined according to its relationship with the zero-crossing rate of speckle intensity fluctuation.The results show that the zero-crossing rate is very sensitive to the velocity of nanoparticles when the velocity of nanofluids ranges from 17.6 mm/s to 60.2 mm/s.A TEM10 mode-like laser beam is designed and taken as an incident light to detect the moving direction of nanoparticles in flowing nanofluids.The moving direction of nanoparticles is parallel to the horizontal axis of the TEM10 mode-like laser beam when the zero-crossing rate reaches maximum.Experimental results show that the moving direction of nanoparticles can also be detected by using the zero-crossing method.
Nanofluids Nanoparticle Laser speckle Zero-crossing method TEM10 mode-like
Qin Yan Jian Lu Xiaowu Ni
Department of Applied Physics,Nanjing University of Science and Technology,Nanjing,P R China,210094
国际会议
上海
英文
1852-1857
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）