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

YAN Qin; LU Jian; NI Xiao-Wu

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

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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.%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.

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《中国物理快报：英文版》 |2012年第4期|92-95|共4页
作者
YAN Qin; LU Jian; NI Xiao-Wu;
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Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094;

Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094;

Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094;

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

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