Effect of laser scanning on increase of throughput in particle separation using laser radiation pressure

Koyanaka, Shigeki; Endoh, Shigehisa

doi:10.1163/156855204774150136

Cited by 2 publications

(2 citation statements)

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“…Therefore, in order to induce the flow of a nanofluid in a micro-channel by a laser beam, the nanofluid must contain nanoparticles whose sizes are determined by the ratio of the scattering force F sctr to the maximum backward longitudinal component of the gradient force. For a Gaussian beam of wavelength λ, a focal spot size w o , the maximum longitudinal component of the gradient force occurs at y = z = 0 and x = kw 2 o /2 √ 3 where this ratio becomes (10) Under the action of the laser beam, if the particle size satisfies condition (12), the particle will move in the direction of the laser propagation against the surrounding fluid. If we assume that the resisting force by the fluid on the moving particle is described by the Stokes law, then the particle velocity can be calculated using…”

Section: Forces Due To the Lasermentioning

confidence: 99%

“…Use of a laser beam to induce and manipulate the motion of micron/nano-size particles has been reported previously [8][9][10][11][12][13][14][15][16]. In these studies, laser-induced motion of transparent particles such as glass, silica, Poly(methyl methacrylate) (PMMA), polystyrene, nickel and aluminum oxides particles in water using a loosely focused Gaussian beam were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Laser-Induced Motion of a Nanofluid in a Micro-Channel

Phuoc

Massoudi

Wang

2016

Fluids

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Since a photon carries both energy and momentum, when it interacts with a particle, photon-particle energy and momentum transfer occur, resulting in mechanical forces acting on the particle. In this paper we report our theoretical study on the use of a laser beam to manipulate and control the flow of nanofluids in a micro-channel. We calculate the velocity induced by a laser beam for TiO 2 , Fe 2 O 3 , Al 2 O 3 MgO, and SiO 2 nanoparticles with water as the base fluid. The particle diameter is 50 nm and the laser beam is a 4 W continuous beam of 6 mm diameter and 532 nm wavelength. The results indicate that, as the particle moves, a significant volume of the surrounding water (up to about 8 particle diameters away from the particle surface) is disturbed and dragged along with the moving particle. The results also show the effect of the particle refractive index on the particle velocity and the induced volume flow rate. The velocity and the volume flowrate induced by the TiO 2 nanoparticle (refractive index n = 2.82) are about 0.552 mm/s and 9.86 fL, respectively, while those induced by SiO 2 (n = 1.46) are only about 7.569 µm/s and 0.135, respectively.

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Section: Forces Due To the Lasermentioning

confidence: 99%