Phase Doppler Particle Analyzer

2016 ◽  
pp. 49-1-49-14
Author(s):  
William Bachalo ◽  
Subramanian Sankar
Keyword(s):  
Phase Doppler Particle Analyzer

scholarly journals Application of Rainbow Thermometry to the Study of Fuel Droplet Heat-Up and Evaporation Characteristics

1996 ◽  
Author(s):  
Subramanian V. Sankar ◽  
Dale H. Buermann ◽  
William D. Bachalo
Keyword(s):  
Vaporization Rate ◽  
Fuel Droplet ◽  
Controlled Experiments ◽  
Regression Rate ◽  
Droplet Vaporization ◽  
Fuel Droplets ◽  
Spray Flame ◽  
Polydisperse Flow ◽  
Phase Doppler Particle Analyzer

Advanced, non-intrusive, laser-based diagnostics are being developed for simultaneously measuring the size, velocity, temperature, and instantaneous regression rates of vaporizing/burning fuel droplets in polydisperse flow environments. The size and velocity of the droplets are measured using a conventional phase Doppler particle analyzer (PDPA), whereas the droplet temperatures are simultaneously measured with a rainbow thermometer. This integrated diagnostic has been applied to the study of fuel droplet heat-up characteristics in a swirl-stabilized kerosene spray flame. It has also been shown that a novel extension of rainbow thermometry can be used to additionally extract the instantaneous droplet vaporization rate. The feasibility of measuring the instantaneous regression rate has also been demonstrated using controlled experiments with a vaporizing/burning stream of ethanol droplets.

A Comparison of Air-Blast and Flow-Blurring Injectors Using Phase Doppler Particle Analyzer Technique

2009 ◽  
Author(s):  
Benjamin M. Simmons ◽  
Heena V. Panchasara ◽  
Ajay K. Agrawal
Keyword(s):  
Vegetable Oil ◽  
Laser Sheet ◽  
High Viscosity ◽  
Spray Angle ◽  
Ambient Conditions ◽  
Air Blast ◽  
New Novel ◽  
Significant Difference ◽  
Phase Doppler Particle Analyzer ◽  
Temperature And Pressure

Recent research on biofuels for power generation has typically focused on biodiesel because the biodiesel feedstrock, e.g., vegetable oil, poses significant combustion problems related to poor atomization. Existing injectors cannot effectively atomize high viscosity fuels such as vegetable oil. However, a new, novel flow-blurring (FB) injector concept has shown promise in overcoming the atomization problems. In this study, a FB injector is compared to a commercial air-blast (AB) injector operated with water at ambient conditions of temperature and pressure. Laser sheet visualization and Phase Doppler Particle Analyzer (PDPA) systems are used to obtain the spray characteristics for a range of air to liquid (ALR) ratios. Results show significant difference in distributions of Sauter Mean Diameters (SMDs), and mean and root-mean square axial velocity for the two injectors operated at a fixed ALR. In comparison to the AB injector, the FB injector produced spray with smaller SMDs, a smaller SMD range over the spray volume, higher RMS and mean axial velocities in the center region, and a compact spray with spray angle nearly independent of ALR. Results show that the FB injector is an effective way of atomizing liquids at relatively low ALRs compared to a traditional AB injector, without the additional pressure drop penalty.

Microfabrication and Laser Diagnosis of Pressure-Swirl Atomizers

2003 ◽  
Author(s):  
Ker-Jer Huang ◽  
Alex C. Chen ◽  
Jing-Tang Yang
Keyword(s):  
Injection Molding ◽  
Plasma Etching ◽  
Design Parameters ◽  
Channel Diameter ◽  
X Ray ◽  
Swirl Chamber ◽  
Phase Doppler Particle Analyzer ◽  
Pressure Swirl ◽  
Discharge Orifice ◽  
Exit Orifice

In this work we used deep-molding manufacture of three kinds to fabricate micro pressure-swirl atomizers to promote their performance, and a Phase Doppler Particle Analyzer (PDPA) to measure the characteristic distributions of the spray flow field of these atomizers. The deep-molding techniques were X-ray LIGA process, ICP-LIGA process (inductive coupling plasma etching), and injection molding LIGA process. Parameters of atomizers examined here include configuration of flow channel, diameter of exit orifice, the ratio of diameters of swirl chamber and discharge orifice, and the thickness of atomizer. Experimental results showed that the manufacturing process combining injection molding with electroplating had large yields and that the technique is highly reliable; enable manufacture of an atomizer at small cost and great quality. Moreover, these microatomizers are assembled well with other components and be readily applied. The results of PDPA diagnosis further revealed that the spray features are related with the design parameters of atomizer dimensions.

Measurement of drop size characteristics in annular centrifugal extractors using phase Doppler particle analyzer (PDPA)

2012 ◽  
Vol 90 (8) ◽  
pp. 985-997 ◽  
Author(s):  
T.V. Tamhane ◽  
J.B. Joshi ◽  
Kamachi Mudali ◽  
R. Natarajan ◽  
R.N. Patil
Keyword(s):  
Drop Size ◽  
Phase Doppler Particle Analyzer

Characterization of Water Mist Sprays Using a Phase-Doppler-Particle-Analyzer and an Iso-Kinetic Sampling Probe

Volume 4 ◽  
2004 ◽  
Author(s):  
Benjamin Ditch ◽  
Hong-Zeng Yu
Keyword(s):  
Drop Size ◽  
Water Drop ◽  
Water Discharge ◽  
Radial Distance ◽  
Water Mist ◽  
Size Spectrum ◽  
Size Distributions ◽  
Sampling Probe ◽  
Phase Doppler Particle Analyzer ◽  
Drop Size Distributions

A Phase-Doppler-Particle-Analyzer (PDPA) was used to screen candidate water mist nozzles for use in a scaling validation aimed to allow scaled-down testing of water mist systems. A custom-designed iso-kinetic sampling probe (IKSP) was developed to independently measure water mist fluxes at the same locations where PDPA measurements were made. Measurements were taken at two elevations in selected full-cone water mist sprays. The water drop size was found to increase with radial distance from the spray centerline, while the mean drop velocity and drop concentration decrease with radial distance. Gross drop size distributions of water mist sprays were derived from local drop size distributions and water fluxes measured in two spray cross sections. It was found that, for the water mist sprays investigated in this study, both Rosin-Rammler and log-normal distributions are required to correlate the entire drop size spectrum. In general, the agreement between the mist fluxes measured with the PDPA and iso-kinetic sampling was within 7% near the spray centerline. The selected nozzles show appropriate intended scaling in terms of the drop size, nozzle discharge pressure, and water discharge rate.

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