We report on a statistical analysis of copper nanofluid speckle image patterns. The far-field speckle images are formed by illuminating the copper nanoparticle (CuNP) suspension using low power continuous wave laser light at 532 nm. The nanofluids is prepared by nanosecond pulsed laser ablation of the highly pure copper target in polysiloxane oil. A stochastic approach based on the fractional Brownian motion and the classical frequential method is applied on the speckle patterns. These methods enable us to extract statistical parameters such as mean speckle size, Hurst coefficient and saturation of variance. Our results show that the mean speckle size remains unchanged with respect to time while the Hurst exponent and the saturation of variance exhibit changes. It has been shown that the stochastic approach makes it possible to characterize the copper nanofluid. The statistical analysis indicates that the Brownian motion of nanoparticles play important role in thermal properties of the copper nanofluids. Including the Brownian motion, the thermal conductivity of the copper nanofluids is calculated.
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ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer
December 18–21, 2009
Shanghai, China
Conference Sponsors:
- Nanotechnology Institute
ISBN:
978-0-7918-4389-5
PROCEEDINGS PAPER
Statistical Speckle Study of Copper Nanofluids
Nastaran Mansour
,
Nastaran Mansour
Shahid Beheshti University, Tehran, Iran
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Mehdi Mohammad Kazemi
,
Mehdi Mohammad Kazemi
Shahid Beheshti University, Tehran, Iran
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Rouhollah Karimzadeh
,
Rouhollah Karimzadeh
Shahid Beheshti University, Tehran, Iran
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Javid Zamir Anvari
Javid Zamir Anvari
Shahid Beheshti University, Tehran, Iran
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Nastaran Mansour
Shahid Beheshti University, Tehran, Iran
Mehdi Mohammad Kazemi
Shahid Beheshti University, Tehran, Iran
Rouhollah Karimzadeh
Shahid Beheshti University, Tehran, Iran
Javid Zamir Anvari
Shahid Beheshti University, Tehran, Iran
Paper No:
MNHMT2009-18406, pp. 555-560; 6 pages
Published Online:
October 26, 2010
Citation
Mansour, N, Mohammad Kazemi, M, Karimzadeh, R, & Zamir Anvari, J. "Statistical Speckle Study of Copper Nanofluids." Proceedings of the ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 1. Shanghai, China. December 18–21, 2009. pp. 555-560. ASME. https://doi.org/10.1115/MNHMT2009-18406
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