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PHASE-DOPPLER ANEMOMETRY

The principle of phase-Doppler anemometry (PDA) relies on the Doppler difference method used for conventional laser-Doppler anemometry and was first introduced by Durst and Zare (1975). By using an extended receiving optical system with two or more photodetectors it is possible to measure simultaneously size and velocity of spherical particles. For obtaining the particle size the phase shift of the light scattered by refraction or reflection from the two intersecting laser beams is used. [Pg.270]

Phase doppler anemometry Cumulative with time >0.5a Limited to droplets, sampling 53... [Pg.497]

JA Ranucci, FC Chen. Phase doppler anemometry a technique for determining aerosol plume-particle size and velocity. Pharm Technol 17 62-74, 1993. [Pg.501]

Phase-Doppler Anemometry. Theoretical analyses on dualbeam light scattering with off-axis detection 670 showed that the spatial frequency of the scattered interference fringe pattern is... [Pg.420]

Capillary hydrodynamic chromatography Fraunhofer diffraction Light-scattering photometry Phase Doppler anemometry Ultrasonic spectroscopy... [Pg.452]

This procedure has been used to determine droplet size in sprays. Oseillations in the curve relating x and D can be smoothed out by the use of an incident laser beam having a broad speetral bandwidth [83]. An accumulation of independent scattering intensities from multiple scatterers ean be used to measure the mean droplet size of a group [84]. This procedure has been applied to water sprays and the experimental data confirmed by phase Doppler anemometry [85]. The applicability of the polarization ratio technique is strongly influenced by the complex refractive index of the dispersed media and is limited to media having a relative refractive index below about 1.44 [86]. [Pg.538]

Bertola F, Grundseth J, Hagesaether L, Dorao C, Luo H, Hjarbo KW, Svend-sen HF, Vanni M, Baldi G, Jakobsen HA (2005) Numerical Analysis and Experimental Validation of Bubble Size Distribution in Two-Phase Bubble Column Reactors. Multiphase Science Technology 17(1-2) 123-145 Breim G, Braeske H, Durst F (2002) Investigation of the unsteady two-phase flow with small bubbles in a model bubble column using phase-Doppler anemometry. Chem Eng Sci 57(24) 5143-5159... [Pg.859]

Phase Doppler anemometry is a specialised research technique which gives information on both particle size and velocity of single particles within the cloud. [Pg.360]

A method which has received considerable attention over the past 15 years is phase-Doppler anemometry (PDA) which allows determination of the size of spherical particles, droplets or bubbles. Hence, local particle size distributions and size-velocity correlations can be obtained. Moreover, recent developments provide the basis for accurate particle concentration or mass flux measurements... [Pg.252]

The methodology and the fundamentals for measurements of the instantaneous local particle density in pneumatic conveying using phase-Doppler anemometry were recently explored by van de Wall and Soo (1994) and Bao and Soo (1995). The concept for their approach was based on associating with each validated particle signal the appropriate measurement volume... [Pg.292]

Durst, F., Tropea, C. and Xu, T.-H. The Slit Effect in Phase Doppler Anemometry. 2nd Int. Conf. on Fluid Dynamic Measurements and its Application, Beijing, China (1994)... [Pg.311]

Hishida, K. and Maeda, M., Application of laser/phase Doppler anemometry to dispersed two-phase flow. Part. Part. Syst. Charact., 7, 152-159 (1990)... [Pg.312]

Onofri, F., Girasole, T., Grehan, G., Gouesbet, G., Brenn, G., Domnick, J., Xu, T.H. and Tropea C., Phase-Doppler anemometry with the dual burst technique for measurement of refractive index and absorption coefficient simultaneously with size and velocity. Part. Part. Syst. Charact., 13, 112-124 (1996)... [Pg.315]

Qiu, H.-H. and Sommerfeld, M., A reliable method for determining the measurement volume size and particle mass fluxes using phase-Doppler anemometry. Experiments in Fluids, Vol. 13, 393-404 (1992)... [Pg.315]

Qiu, H.-H., Sommerfeld, M. and Durst, F., Two novel Doppler signal detection methods for laser-Doppler and phase-Doppler anemometry. Meas. Sci. Techn., 5, 769-778 (1994)... [Pg.315]

Sommerfeld, M. and Qiu, H.-H., Characterization of particle-laden confined swirling flows by phase-Doppler anemometry and numerical calculation. Int. J. Multiphase Flows, 19, 1093-1127(1993)... [Pg.316]

J. C. Bhatia, J. Dominick, F. Durst Phase-Doppler-Anemometry and the Log-Hyperbolic Distribution Applied to Liquid Sprays, Part. Part. Syst. Char. 5, 153-164 (1988). [Pg.494]

Various flow visualisation techniques have been utilised to obtain experimental results from local gas hold-ups and bubble size distributions (BSD) in a gas-liquid mixed tank. Particle Image Velocimetry (PIV), Phase Doppler Anemometry (PDA), Capillary suction probe (CSP), High-speed video imaging (HSVI) and Electrical Resistance Tomography (ERT) techniques have been applied. The applicability of various techniques is dependent on the location of the measurement, the physical properties of the gas-liquid flow, the gas hold-up and the size of the tank. [Pg.773]

See other pages where PHASE-DOPPLER ANEMOMETRY is mentioned: [Pg.1171]    [Pg.400]    [Pg.409]    [Pg.421]    [Pg.422]    [Pg.503]    [Pg.503]    [Pg.1727]    [Pg.393]    [Pg.536]    [Pg.96]    [Pg.360]    [Pg.41]    [Pg.8]    [Pg.252]    [Pg.270]    [Pg.309]    [Pg.269]    [Pg.281]    [Pg.1721]    [Pg.462]    [Pg.467]    [Pg.516]    [Pg.621]    [Pg.774]    [Pg.241]   
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See also in sourсe #XX -- [ Pg.101 ]



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