| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Measurement of the Velocities of Nanoparticles in Flowing Nanofluids using the Zero-Crossing Laser Speckle Method |
| YAN Qin,LU Jian,NI Xiao-Wu** |
| Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094 |
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| Cite this article: |
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YAN Qin, LU Jian, NI Xiao-Wu 2012 Chin. Phys. Lett. 29 044207 |
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Abstract 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 53.4 mm/s, the average velocity of the nanoparticles is 51.8±5.1 mm/s.
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Received: 12 October 2011
Published: 04 April 2012
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| PACS: |
42.25.Fx
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(Diffraction and scattering)
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42.30.Ms
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(Speckle and moiré patterns)
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