Laser Systems in Flow Measurement

Durrani, T.S.; Greated, Clive

doi:10.1007/978-1-4613-4106-2

Cited by 147 publications

(55 citation statements)

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“…The successful use of the laser Doppler anemometer (LDA) for measuring fluid velocity in liquids and gases has been described by Adrian et al (1980), Durrani et al (1977) and Durst et al (1976). Since its introduction in 1964 by Yeh and Cummins (1964), this technique has received considerable attention in aerospace science, industrial research, and recently, in hemodynamic studies.…”

Section: Introductionmentioning

confidence: 99%

Migration in an oscillatory flow of a laminar suspension measured by laser anemometry

Einav

Lee

1988

Experiments in Fluids

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Oscillatory flow occurs in a wide range of areas of engineering importance. Two-way lateral migration of particles was observed in the flow of a steady, laminar, dilute, neutrally-buoyant suspension of rigid particles in a tube. The equilibrium particleposition was dependent on the dimensionless Womersley parameter. Experiments were performed in which the Womersley parameter was varied between 1.12 and 8.0. For low values of the parameter, two-way radial migration was observed as in steady, laminar flow.For higher values of the parameter, two equilibrium positions were observed, together with three particle free layers across the radius of the tube.

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Section: Introductionmentioning

confidence: 99%

Migration in an oscillatory flow of a laminar suspension measured by laser anemometry

Einav

Lee

1988

Experiments in Fluids

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“…The LDA technique, which was introduced during the late 1970s [1,[26][27][28], is now considered to have achieved maturity. The physical phenomena on which LDA is based, as well as the relevant data processing algorithms, are well known and have been extensively described.…”

Section: Discussionmentioning

confidence: 99%

Laser Doppler Anemometry

Blondel

2010

Handbook of Combustion

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The sections in this article are Introduction Measurement Principles Laser Beam Doppler Effect The Fringe Model Measurement Volume Backscatter versus Forward‐Scatter LDA System Description Optics Two‐ and Three‐Dimensional LDA for Two‐ and Three‐Velocity Components Laser Frequency Shift Seeding Seeding as Flow Field Tracers Light Scattering by Small Particles Type and Size of Seeding Particles Seeding Particles Generator Signal Processing and Data Analysis LDA Signals Moments Weighting Factor Time, Length Scale, and Turbulence Velocity Spectra Applications Automotive Engines Large‐Scale Burners Nonpremixed Turbulent Flame Conditional Velocity in a Swirling Gas–Air Flame Outlook

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“…In d u m m y experiments with the same cuvette and stirring device, average velocities at several points were determined by Laser Doppler Anemometry (14), using a DISA 55X Modular LDA system with a Spectra Physics H e -N e laser (632 nm, 35 roW), in conjunction with a DISA 55 L 90 a Counter Processor. The apparatus did not, however, include at the time of measurement a Bragg cell, thus only absolute values of velocities could be measured.…”

Section: Flow Velocity Measurementsmentioning

confidence: 99%

Coagulation in a shear field generated by stirring in a cylindrical vessel

Logtenberg

Stein

1985

Journal of Colloid and Interface Science

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The coagulation of aqueous ZnO dispersions is investigated at various shear rates, in a shear field generated by stirring in a cylindrical vessel, and at different ~" potential values. Laser Doppler anemometry measurements permitted the construction of a model of the shear field by which average shear rates could be calculated. At low shear rates (~<200 sec-~), the experimental capture efficiencies are independent of the ~" potential (-20 ~" > -3 2 mV). At larger shear rates, the capture efficiencies rise with increasing -~, if the absolute value of the ~-potential is ~<30 mV, due to inertial pseudoforces. These are more effective for irregular than for spherical particles, probably because the penetration of the last liquid film between two particles is easier at edges than at smooth surfaces. This effect, however, can be counteracted by electrostatic repulsion.

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Laser Systems in Flow Measurement

Cited by 147 publications

References 0 publications

Migration in an oscillatory flow of a laminar suspension measured by laser anemometry

Migration in an oscillatory flow of a laminar suspension measured by laser anemometry

Laser Doppler Anemometry

Coagulation in a shear field generated by stirring in a cylindrical vessel

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