The aerodynamic behaviour of long aspect ratio nylon fibrous particles has been investigated experimentally whilst settling in air under super dilute conditions without any influence of secondary flows and at fibre Reynolds numbers of 0.5 -2 based on fibre diameter. A method for laser-based measurement of the orientations and velocities of fibrous particles is presented. The experimental apparatus employs a two-dimensional Particle Tracking Velocimetry (PTV) to calculate orientation and velocity based on the two end-points. The controlling length scale in the relationship between Reynolds number and drag coefficient was investigated and the equivalent diameter of settling fibre in air was reported.
In present study, the aerodynamic behaviour of long aspect ratio fibrous particles has been investigated experimentally whilst settling in air under super dilute conditions without any influence of secondary flows and at particle Reynolds numbers of 30–80 based on fibre length. A method for laser-based measurement of the orientations and velocities of fibrous particles is presented. The experimental apparatus employs Particle Tracking Velocimetry (PTV) to calculate orientation and velocity based on the two end-points. Fibres’ mean vertical and horizontal components of settling velocities, angular velocity, orientation, number density and drag coefficient were calculated to analyze their aerodynamics.
The aerodynamics of long aspect ratio nylon fibrous particles has been investigated experimentally whilst settling in air under super dilute conditions without any influence of secondary flows and at fibre Reynolds numbers of 10-100 based on fibre length.Measurement of the orientations and velocities of fibrous particles is undertaken by twodimensional Particle Tracking Velocimetry (PTV), based on the two end-points. A statistical evaluation of fibres' mean vertical and horizontal components of settling velocities, angular velocity, orientation, number density is presented and used to assess particle aerodynamics.
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