Open AccessEvaluation of StereoPIV Measurement of Droplet Velocity in an Effervescent Spray
Author(s) -
Sina Ghaemi,
Payam Rahimi,
David S. Nobes
Publication year - 2010
Publication title -
international journal of spray and combustion dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 16
eISSN - 1756-8285
pISSN - 1756-8277
DOI - 10.1260/1756-8277.2.2.103
Subject(s) - shadowgraph , particle tracking velocimetry , particle image velocimetry , spray characteristics , velocimetry , mechanics , optics , materials science , particle (ecology) , tracking (education) , thermal velocity , observational error , physics , flow velocity , spray nozzle , flow (mathematics) , nozzle , turbulence , thermodynamics , oceanography , geology , statistics , mathematics , psychology , pedagogy
Particle image velocimetry (PIV) is a well known technique for measuring the instantaneous velocity field of flows. However, error may be introduced when measuring the velocity field of sprays using this technique when the spray droplets are used as the seed particles. In this study, the effect of droplet number density, droplet velocity profile, and droplet size distribution of a spray produced by an effervescent atomizer on velocity measurement using a StereoPIV has been investigated. A shadowgraph-particle tracking velocimetry (S-PTV) system provided measurement of droplet size and velocity for comparison. This investigation demonstrated that the StereoPIV under-estimates velocity at near-field dense spray region where measurement accuracy is limited by multi-scattering of the laser sheet. In the dilute far-field region of the spray, StereoPIV measurement is mostly in agreement with velocity of the droplet size-class which is close to the mean diameter based on droplet number frequency times droplet cross sectional area