Numerical study for separation of particles in helical microchannel Online publication date: Tue, 03-Sep-2024
by U.D. Nimbalkar; Apoorv Sureshkumar Mishra; Pankaj E. Rawool; V.K. Agrawal
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 24, No. 5, 2024
Abstract: The present work was aimed at studying the Dean flow pattern in the cross-section of the helical microchannel and its effect on the inertial focusing of bloodstream particles. The Dean flow, a fundamental phenomenon in fluid dynamics, illustrates fluid flow through curved geometries where centrifugal force interacts with pressure gradient. The rectangular, aspect ratio 0.8 and 0.6, and circular 80 μm diameter cross-sections of same axial pitch were analysed for Reynolds number ~ 40, Dean number ~ 9 and Ratio of lift-to-drag forces ~ 0.5. Appreciable focusing was observed as a part of numerical studies, leading to a fine stream of particles at the outlet. The results were analysed and compared with the previous studies. Hence, a rectangular cross-section helical microchannel design is proposed for particle separation that can be fabricated with any suitable polymer.
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