Publication de 12 numéros par an
ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684
Indexed in
INVESTIGATION OF MULTIPHASE PARTICLE IMAGE VELOCIMETRY USING MONTE CARLO SIMULATIONS
RÉSUMÉ
Particle image velocimetry (PIV) measurements in polydisperse sprays have been investigated using Monte Carlo simulations. The objective of the study was to determine how using droplets with a wide size distribution for the "seed" particles in PIV measurements affects the mean velocity obtained from the cross-correlation of the image pairs. Simulations were conducted using a variety of droplet size distributions, including a uniform distribution (in which the probability density function is a constant value for all allowable droplet sizes), log-normal size distributions, Rosin-Rammler size distributions, and a size distribution determined experimentally using phase Doppler interferometry. It was found that polydispersity has a strong effect on the measured velocity field, with the measured mean velocities being weighted toward the velocities of the larger droplets. The estimated mean velocity resulting from the cross-correlation algorithm was found to be approximately equal to the mean velocity weighted by the droplet surface area for all of the size distributions investigated. Signal saturation in the images was also found to affect the cross-correlation of the image pairs and the resulting mean velocities.
-
Brady Michael R., Raben Samuel G., Vlachos Pavlos P., Methods for Digital Particle Image Sizing (DPIS): Comparisons and improvements, Flow Measurement and Instrumentation, 20, 6, 2009. Crossref
-
Presser Cary, Papadopoulos George, Widmann John F., PIV measurements of water mist transport in a homogeneous turbulent flow past an obstacle, Fire Safety Journal, 41, 8, 2006. Crossref
-
Husted Bjarne Paulsen, Petersson Per, Lund Ivar, Holmstedt Göran, Comparison of PIV and PDA droplet velocity measurement techniques on two high-pressure water mist nozzles, Fire Safety Journal, 44, 8, 2009. Crossref