Article

Flow field characteristics in the near field region of particle-laden coaxial jets

Experiments in Fluids (impact factor: 1.74). 04/2012; 39(5):885-894. DOI:10.1007/s00348-005-0024-6

ABSTRACT The effects of solid particles on the flow structure in the near field region of a coaxial water jet are investigated non-intrusively
using molecular tagging velocimetry. Glass beads of 240μm and specific gravity SG of 2.46 are used at three volume loadings
of γv=0.03, 0.06, and 0.09% in the central water jet with a Reynolds number of 4.1×104. Measurements are acquired for four annular to central jet velocity ratios in the range 0.11≤ U
o/U
i≤1.15 at downstream distances up to six inner jet diameters and the results are analyzed for the effects of solid particles
on the characteristics of flow. It is found that the addition of particles does not affect the mean fluid velocity profile
in this region. The results also indicate a small and moderate enhancement of axial turbulent velocity and radial gradients
of velocity fluctuations, respectively, due to the presence of particles.

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Keywords

axial turbulent velocity
 
central jet velocity ratios
 
central water jet
 
coaxial water jet
 
downstream distances
 
field region
 
flow structure
 
Glass beads
 
inner jet diameters
 
mean fluid velocity profile
 
moderate enhancement
 
non-intrusively
 
Reynolds number
 
specific gravity SG
 
velocity fluctuations
 
volume loadings
 

Reza Sadr