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Published on: August 26, 2015
Nondimensional analysis of particle behavior during cross-type optical particle separation
Sang Bok Kim1, Hyung Jin Sung, Sang Soo Kim
1Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea.
Applied Optics
|August 4, 2009
Summary
A new dimensionless number, S, quantifies optical forces versus viscous drag in particle separation. Higher S values lead to longer particle retention distances within laser beams.
Area of Science:
- Optical physics
- Fluid dynamics
- Particle manipulation
Background:
- Optical particle separation is crucial for various scientific and industrial applications.
- Understanding particle behavior under optical forces requires detailed analysis.
Purpose of the Study:
- To perform a nondimensional analysis of particle behavior during cross-type optical particle separation.
- To define and investigate the effects of a new dimensionless number, S, on particle motion.
Main Methods:
- Defined a new dimensionless number, S, representing the ratio of optical force to viscous drag force.
- Examined particle motion by varying S, laser wavelength, particle size, and refractive index.
- Validated an analytical expression for retention distance for large S values.
Main Results:
- For large S, particles exhibit distinct acceleration, deceleration, and release phases within the laser beam.
- Retention distance is significantly longer for particles with large S compared to small S.
- Laser wavelength, particle size, and refractive index influence particle behavior.
Conclusions:
- The dimensionless number S effectively characterizes particle behavior in optical separation.
- Particle retention distance is strongly dependent on the magnitude of S.
- The findings provide a basis for optimizing optical particle separation techniques.
