Inertial focusing in triangular channels and dean-flow aided alteration of focusing and separation using tunable 3D radius of curvature

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Funding details Abstract We investigated inertial focusing in triangular channels with varying apex angle, Re and a/H(a=particle size, H=hydraulic diameter). In addition, we devised an adjustable curved triangular channel using a flexible PDMS channel for control of focusing position. The curving direction and the radius of curvature can be easily controlled with the flexible device, which enables changes in Dean flow direction and strength in the curved triangular channels. Particles are normally focused into top and bottom focusing positions in the straight triangular channels. However, stable focusing positions are altered to single or tow focusing positions by additional Dean drag forces.