Response characteristics of the phase Doppler particle analyzer for sizing spherical particles larger than the light wavelength

Sankar, S. V.; Bachalo, W. D.

doi:10.1364/ao.30.001487

Cited by 72 publications

(33 citation statements)

References 4 publications

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“…A previously developed phase Doppler response model was used to study the effect of droplet trajectory on phase response and scattering intensity [4]. The model is a geometric optics based scattering model that accounts for the Gaussian nature of the illuminating probe beams by integrating the appropriate scattering functions over the surface of the droplet.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…The model is a geometric optics based scattering model that accounts for the Gaussian nature of the illuminating probe beams by integrating the appropriate scattering functions over the surface of the droplet. The model will not be discussed further here while the reader is referred to the published descriptions of the model [4]. The trajectory coordinate, T|, is defined as 2y/D w , where y is the trajectory normal to the scattering plane as defined from the center of the probe volume, and D w is the 1/e 2 beam waist diameter.…”

Section: Theoretical Modelmentioning

confidence: 99%

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The Use of Small Probe Volumes with Phase Doppler Interferometry

Strakey¹,

Talley²,

Sankar³

et al. 1998

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S NUMBER(S) AFRL-PR-ED-TP-1998-059 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTES AbstractPhase Doppler interferometry utilizing a probe volume much smaller than the droplets being measured has been shown to work well when coupled with a phase and intensity validation scheme which is capable of eliminating trajectory dependent scattering errors. Measurements in monodispersed droplet streams have been performed to characterize the probe volume, and an intensity validation scheme and corresponding probe volume correction factor have been developed. Volume flux measurements in dilute sprays have shown a significant improvement over standard phase Doppler interferometry techniques at small beam waist to droplet size ratios.

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Section: Theoretical Modelmentioning

confidence: 99%

Section: Theoretical Modelmentioning

confidence: 99%

The Use of Small Probe Volumes with Phase Doppler Interferometry

Strakey¹,

Talley²,

Sankar³

et al. 1998

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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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“…Many studies have been presented in the literature that have addressed design considerations as well as the applicability of the P͞D technique to spherical aerosol sizing under various measurement conditions. [1][2][3][4][5] The P͞D method has proved attractive for in situ measurements, as it offers several important advantages over alternative techniques, including nonintrusive operation, high spatial resolution, simultaneous particle size and velocity measurements, and measurements that are independent of absolute intensity. Despite the successes in spherical aerosol sizing, only recently has serious effort been made to generalize the P͞D measurement technique to sizing cylindrical fibers.…”

Section: Introductionmentioning

confidence: 99%