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Particle-laden jets: Particle distribution and back-reaction on the flow
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. Dipartimento di Ingegneria Meccanica e Aeronautica, La Sapienza University of Rome, Italy .ORCID iD: 0000-0002-9172-6311
2011 (English)Conference paper (Refereed)
Abstract [en]

DNS data of particle-laden jets are discussed both in the one- and two-way coupling regimes. Dynamics of inertial particles in turbulent jets is characterized by an anomalous transport that leads to the formation of particle concentration peaks along the jet axis. Larger is the particle inertia farther the peak location occurs. The controlling parameter is found to be the local large-scale Stokes number which decreases quadratically with the axial distance and is order one in coincidence of the peaks. The centerline mean particle velocity is characterized by two scaling laws. The former occurs upstream the location where the Stokes number is order one, and is linear in the axial distance with negative coefficient. The latter, occurring downstream where the local Stokes number is small, coincides with that of the centerline mean fluid velocity. This behavior affects the development of the particle-laden jet when the mass load of the particulate phase increases and two-way coupling effects become relevant. Two distinct behaviors for the jet development are found behind and beyond the location of unity local Stokes number leading to different scaling laws for the mean centerline fluid velocity.

Place, publisher, year, edition, pages
2011. Vol. 318, no SECTION 5
Keyword [en]
Anomalous transport, Axial distance, Centerlines, Controlling parameters, Fluid velocities, Inertial particles, Jet axis, Mass load, Negative coefficients, Particle concentrations, Particle distributions, Particle inertia, Particle velocities, Stokes number, Turbulent jet, Two-way coupling, Two-way coupling effects, Physics, Turbulence
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-149908DOI: 10.1088/1742-6596/318/5/052018ISI: 000301293000018ScopusID: 2-s2.0-84856323776OAI: diva2:744543
13th European Turbulence Conference, ETC13; Warsaw; Poland; 12 September 2011 through 15 September 2011

QC 20140908

Available from: 2014-09-08 Created: 2014-08-28 Last updated: 2014-09-08Bibliographically approved

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Sardina, Gaetano
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