Measurement of the Transient Velocity of Nanoparticles in Flowing Nanofluids by Using the Method of Dynamic Laser Speckles

Abstract:

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.

• Periodical: Applied Mechanics and Materials (Volumes 226-228)
• Pages: 1852-1857
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.226-228.1852
• Online since: November 2012
• Authors: Qin Yan, Jian Lu, Xiao Wu Ni
• Keywords: Laser Speckle, Nanofluid, Nanoparticle, TEM₁₀ Mode-Like, Zero-Crossing Method

References

[1] S. U. S. Choi: ASME, FED, Vol. 231(1995) , p.99.

[2] Amit Gupta and Ranganathan Kumara: Appl. Phys. Lett., Vol. 91(2007), p.223102.

[3] P. D. Shima, John Philip and Baldev Raj: Appl. Phys. Lett., Vol. 94(2009), p.223101.

[4] Reza Azizian: Ind. Eng. Chem. Res., Vol. 51(2012), p.1782.

[5] Q. Yan, M. Qian and X. Ni: Chin. Phys. Lett. Vol. 26(2009), p.044201.

[6] M. Qian, J. Liu and M. Yan: Vol. 14(2006), p.7559.

[7] M. Qian, X. Ni, Z. Shen and Lu. Jian: Key Engineering Materials Vol. 364(2008), p.1111.

[8] M. Qian, J. Liu, Z. Shen, J. Lu and X. Ni: Lasers in Engineering Vol. 18(2008), p.203.

[9] T. Asakura and N. Takai : Appl. Phys. Vol. 25(1981), p.179.

[10] M. Kowalczyk: Proc. SPIE Vol. 2729 (1996), p.139.

[11] Q. Yan, Z. Zhou: Chin. Phys. Lett. Vol. 19(2002), p.169.

[12] M. Kowalczyk: Proc. SPIE, Vol. 2729(1996), p.146.