LDA Measurement in Cylindrical Containers without Using Planar Secondary Units
Publication: Journal of Hydraulic Engineering
Volume 138, Issue 11
Abstract
To measure velocity components using the laser Doppler anemometry (LDA)in a cylindrical surface, as in a hydrocyclone, traditionally, one encloses the top circular tube of the hydrocyclone with a flat surface box to minimize the refraction effects of laser beams caused by the curved solid walls. In this brief study, an alternative procedure is suggested to reorient the laser beams to measure the mean and fluctuation velocity components. Adopting the beam orientation suggested—at a single point in the flow field—the axial and circumferential mean velocity components, along with the corresponding turbulent normal and shear stress components, can be determined. Test results confirm that the proposed method is valid to get data related to the mean velocities and the Reynolds stresses at a single point in the flow field of a hydrocyclone. The suggested procedure with slight modifications can be applied to measure velocities in the flow field formed by other circular surfaces, such as cones.
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Published In
Journal of Hydraulic Engineering
Volume 138 • Issue 11 • November 2012
Pages: 970 - 973
Copyright
© 2012 American Society of Civil Engineers.
History
Received: May 20, 2011
Accepted: May 11, 2012
Published online: May 15, 2012
Published in print: Nov 1, 2012
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