TY - JOUR
T1 - Characterization of spray-induced turbulence using fluorescence PIV
AU - van der Voort, D.D.
AU - Dam, N.J.
AU - Clercx, H.J.H.
AU - van de Water, W.
PY - 2018/7
Y1 - 2018/7
N2 - The strong shear induced by the injection of liquid sprays at high velocities induces turbulence in the surrounding medium. This, in turn, influences the motion of droplets as well as the mixing of air and vapor. Using fluorescence-based tracer particle image velocimetry, the velocity field surrounding 125–135 m/s sprays exiting a 200-μm nozzle is analyzed. For the first time, the small- and large-scale turbulence characteristics of the gas phase surrounding a spray has been measured simultaneously, using a large eddy model to determine the sub-grid scales. This further allows the calculation of the Stokes numbers of droplets, which indicates the influence of turbulence on their motion. The measurements lead to an estimate of the dissipation rate ≈ 35 m^2/s^3 , a microscale Reynolds number Re ≈ 170, and a Kolmogorov length scale of ≈ 10^−4 m. Using these dissipation rates to convert a droplet size distribution to a distribution of Stokes numbers, we show that only the large scale motion of turbulence disperses the droplet in the current case, but the small scales will grow in importance with increasing levels of atomization and ambient pressures.
AB - The strong shear induced by the injection of liquid sprays at high velocities induces turbulence in the surrounding medium. This, in turn, influences the motion of droplets as well as the mixing of air and vapor. Using fluorescence-based tracer particle image velocimetry, the velocity field surrounding 125–135 m/s sprays exiting a 200-μm nozzle is analyzed. For the first time, the small- and large-scale turbulence characteristics of the gas phase surrounding a spray has been measured simultaneously, using a large eddy model to determine the sub-grid scales. This further allows the calculation of the Stokes numbers of droplets, which indicates the influence of turbulence on their motion. The measurements lead to an estimate of the dissipation rate ≈ 35 m^2/s^3 , a microscale Reynolds number Re ≈ 170, and a Kolmogorov length scale of ≈ 10^−4 m. Using these dissipation rates to convert a droplet size distribution to a distribution of Stokes numbers, we show that only the large scale motion of turbulence disperses the droplet in the current case, but the small scales will grow in importance with increasing levels of atomization and ambient pressures.
UR - http://www.scopus.com/inward/record.url?scp=85061627693&partnerID=8YFLogxK
U2 - 10.1007/s00348-018-2561-9
DO - 10.1007/s00348-018-2561-9
M3 - Article
SN - 0723-4864
VL - 59
JO - Experiments in Fluids
JF - Experiments in Fluids
IS - 7
M1 - 110
ER -