Phase/Doppler Spray Analyzer For Simultaneous Measurements Of Drop Size And Velocity Distributions

Bachalo, W. D.; Houser, M. J.

doi:10.1117/12.7973341

Cited by 518 publications

(190 citation statements)

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“…Actuellement, la granulovélocimétrie phase-Doppler est la technique la plus performante pour mesurer ces quantités. Introduite par le Professeur F. Durst en 1975 [1], cette extension de la vélocimétrie laser-Doppler ne connut un réel développe-ment qu'à partir de 1984 [2,3]. Une introduction à la technique phase-Doppler est donnée dans [4].…”

Section: • Introductionunclassified

Anémométrie Phase Doppler en milieux multiphasiques : vers de nouvelles possibilités

1996

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Section: • Introductionunclassified

Anémométrie Phase Doppler en milieux multiphasiques : vers de nouvelles possibilités

1996

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“…1) in the forward scatter direction. This gives a linear relationship between the phase diflerence and the diameter of the scattering bubble, as calculated from analytical modeling using the Lorenz-Mie theory (Bachalo and Houser, 1984;Breña de la Rosa et al, 1989, 1990Sankar and Bachalo, 1991). In all the cases presented here the measurements were taken at 20 nozzle diameters, 10 diameters downstream from the air injection point.…”

Section: Experimental Setup and Measurement Techniquesmentioning

confidence: 99%

Statistical description of the bubble cloud resulting from the injection of air into a turbulent water jet

Martı́nez-Bazán

Montañés²,

Lasheras

2002

International Journal of Multiphase Flow

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The final bubble size distribution, resulting from the break-up of an air jet injected into the central axis of a fully developed, high Reynolds number turbulent water jet has been measured using a Phase Doppler Particle Analyzer (PDPA). The shape of the final size distribution is shown to depend not only on the dissipation rate of turbulent kinetic energy, e, but also on the global void fraction, a H . It has been shown that such a dependence can be expressed as a function of two dimensionless numbers, namely the jet Weber number, W en = pUjDj/a, and the ratio between the initial bubble's size and the critical diameter, DQ/D C . The statistical properties of the time and distance separating two bubbles of the same diameter, after the turbulent break process is complete, ha ve also been measured. The probability density function of the interarrival time between two consecutive bubbles was found to follow an exponential distribution with intensity factor, X, depending on the number density of bubbles of a certain diameter and on the velocity of the flow.

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“…Although the sizing accuracy of the technique has been verified for measuring large droplets (e.g., Bachalo and Houser, 1984), the ability of a phase Doppler system to accurately size par- ticles down to its lower detection limit (< 1 pm) has not been proven. The sizing accuracy of the PDPA at small sizes is of considerable interest, inasmuch as the technique would provide a valuable tool for basic aerosol and fluid dynamic research, especially in areas such as turbulent fluid-particle interaction, inhalation toxicology, and atmospheric research.…”

Section: Introductionmentioning

confidence: 99%

“…Phase Doppler instruments can be operated in either a forward scattered mode (refraction dominated) or a back scattered mode (reflection dominated). A linear relationship between the phase difference of the scattered light and the particle diameter has been shown for large particles using both geometrical optics (Bachalo and Houser, 1984) and Mie scattering theory (Saffman et al, 1984). Thus, by measuring the extent of the phase difference between photodetectors one can infer the particle size.…”

Section: Introductionmentioning

confidence: 99%

“…The phase Doppler technique (Bachalo, 1980;Bachalo and Houser, 1984;Saffman et al, 1984) can be used to make nonintrusive, simultaneous measurements of single particle diameter and velocity; concentration and velocity distributions can be obtained by summing over a large number of single-particle events. This class of nonintrusive systems can offer several distinct advantages compared to sampling-type systems, including the ability to make measurements: (1) that correlate particle size, velocity, and time of arrival, (2) without disturbing the flow *To whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Calibration of the Phase Doppler Particle Analyzer with Monodisperse Droplets

Ceman

Rader

O’Hern

1993

Aerosol Science and Technology

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The experimental response of the phase Doppler particle analyzer (Aerometrics, Inc., Sunnyvale, CAI to monodisperse oleic acid droplets in the 2.3-24-pm range is presented for three optical configurations. Significant nonlinearities for droplets with diameters < 20 p m were seen when using the standard configuration of a 495-mm focal length receiving lens at an off-forward scattering angle of 0 = 30". Of particular concern are response oscillations < 7 p m that lead to multivalued regions. In order to reduce these nonlinearities, two improvements to the standard receiver configuration were studied as suggested by theoretical studies reported in the literature. First, the receiver focal length was shortened to 240 mm (at 0 = 30") to increase the integration of scattered light. --As expected, the instrument response did significantly improve over the standard case, both in terms of linearity and scatter, for droplets > 5 pm. A significant departure from linearity (undersizing by 1.7 p m for a 2.3-pm indicated droplet diameter) was observed below this size, although the multivalued region of response was greatly reduced. Second, the receiving lens (focal length of 240 mm) was configured at a collection angle of 70°, close to the Brewster angle for oleic acid droplets where interference from reflected light should be minimized. Surprisingly, the performance of this configuration was comparable to the standard case (even though a shorter focal length was used), and inferior to the 240-mm/3O0 configuration.

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Phase/Doppler Spray Analyzer For Simultaneous Measurements Of Drop Size And Velocity Distributions

Cited by 518 publications

References 0 publications

Anémométrie Phase Doppler en milieux multiphasiques : vers de nouvelles possibilités

Anémométrie Phase Doppler en milieux multiphasiques : vers de nouvelles possibilités

Statistical description of the bubble cloud resulting from the injection of air into a turbulent water jet

Calibration of the Phase Doppler Particle Analyzer with Monodisperse Droplets

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