Journal
JOURNAL OF FLUID MECHANICS
Volume 944, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2022.486
Keywords
particle/fluid flow
Categories
Funding
- National Natural Science Foundation of China [12072319, 91752117, 91852205]
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A drag correlation model for laminar particle-laden flows is established based on interfaced-resolved direct numerical simulations. The model takes into account the effects of density ratio and turbulence by correcting the drag correlation and introducing the relative turbulent kinetic energy.
A drag correlation is established for laminar particle-laden flows, based on data from the interfaced-resolved direct numerical simulations (IR-DNS) of particle sedimentation in a periodic domain at density ratio ranging from 2 to 1000, particle concentration ranging from 0.59 % to 14.16 %, and particle Reynolds number below 132. Our drag decreases slightly with increasing density ratio when the other parameters are fixed. The drag correlation is then corrected to account for the turbulence effect by introducing the relative turbulent kinetic energy, from the 1R-DNS data of the upward turbulent channel flows laden with the particles larger than the Kolmogorov length scale at relatively low particle volume fractions. A drift velocity model is developed to obtain the effective slip velocity from the interphase mean velocity difference for the vertical turbulent channel flow by considering the effects of particle inertia, particle concentration distribution and large-scale streamwise vortices.
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