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Particle transport in turbulent curved pipe flow

Published online by Cambridge University Press:  15 March 2016

Azad Noorani ,
Gaetano Sardina ,
Luca Brandt  and
Philipp Schlatter
Azad Noorani*
Affiliation:
Swedish e-Science Research Centre (SeRC), Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
Gaetano Sardina
Affiliation:
Swedish e-Science Research Centre (SeRC), Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
Luca Brandt
Affiliation:
Swedish e-Science Research Centre (SeRC), Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
Philipp Schlatter
Affiliation:
Swedish e-Science Research Centre (SeRC), Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
*
†Email address for correspondence: azad@mech.kth.se
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Abstract

Direct numerical simulations (DNS) of particle-laden turbulent flow in straight, mildly curved and strongly bent pipes are performed in which the solid phase is modelled as small heavy spherical particles. A total of seven populations of dilute particles with different Stokes numbers, one-way coupled with their carrier phase, are simulated. The objective is to examine the effect of the curvature on micro-particle transport and accumulation. It is shown that even a slight non-zero curvature in the flow configuration strongly impact the particle concentration map such that the concentration of inertial particles with bulk Stokes number $0.45$ (based on bulk velocity and pipe radius) at the inner bend wall of mildly curved pipe becomes $12.8$ times larger than that in the viscous sublayer of the straight pipe. Near-wall helicoidal particle streaks are observed in the curved configurations with their inclination varying with the strength of the secondary motion of the carrier phase. A reflection layer, as previously observed in particle laden turbulent S-shaped channels, is also apparent in the strongly curved pipe with heavy particles. In addition, depending on the curvature, the central regions of the mean Dean vortices appear to be completely depleted of particles, as observed also in the partially relaminarised region at the inner bend. The turbophoretic drift of the particles is shown to be affected by weak and strong secondary motions of the carrier phase and geometry-induced centrifugal forces. The first- and second-order moments of the velocity and acceleration of the particulate phase in the same configurations are addressed in a companion paper by the same authors. The current data set will be useful for modelling particles advected in wall-bounded turbulent flows where the effects of the curvature are not negligible.

JFM classification

Multiphase and Particle-laden Flows: Multiphase flow Multiphase and Particle-laden Flows: Particle/fluid flow Turbulent Flows: Turbulence simulation
Type
Papers
Information
Journal of Fluid Mechanics , Volume 793 , 25 April 2016 , pp. 248 - 279
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Copyright
© 2016 Cambridge University Press 

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