Direct numerical simulation of bidisperse inertial particles settling in turbulent channel flow

نویسندگان

چکیده

The behavior of settling velocity and clustering bidisperse inertial particles in a turbulent channel flow is investigated through direct numerical simulation. particle-laden planar has friction Reynolds number at Re? = 180. Eulerian–Lagrangian method used to study the dynamic properties monodisperse with 16 different simulation sets, which are distinguished by Stokes numbers ranging from St+ 1.31 52.58 particle ratio 1:1 1:8. Momentum exchange between fluid phases considered as chosen initial volume fraction 5 × 10?5 two-way coupling regime. gravity set direction normal both wall streamwise direction. We observe that cases turbophoresis effect smaller diameter significant even though it very weak corresponding cases. use radial distribution function (RDF) investigate degree turbophoresis. results indicate RDF larger for large small greatly affected bulk ratio. Unlike clustering, terminal velocities final equilibrium state. When their fractions lower than those cases, either becomes reduced value. also relationship vortex strength. show preferential sweeping mechanism strengthened decreasing can be quantified slope curve variation

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Turbulent Supersonic Channel Flow: Direct Numerical Simulation and Modeling

a = mean speed of sound, R T 1=2 aw = mean speed of sound at the wall, RTw 1=2 C = turbulent viscosity parameter, T= Lk cp = specific heat at constant pressure, R= 1 ; 1004:5 J= kg K cv = specific heat at constant volume, R= 1 ; 717:5 J= kg K f = uniform body force, w=h h = half channel height hw = wall length scale, h=Re i = turbulence intensity, 2k=3 = U1 k = turbulent kinetic energy, uiui=2 ...

متن کامل

investigation of turbulent kinetic energy redistribution in a channel flow using direct numerical simulation

in this study, the turbulent kinetic energy redistribution process is investigated. to this aim, the direct numerical simulation (dns) of incompressible flow of a newtonian fluid through a channel at a shear reynolds number of reτ = 180 is used to produce a flow data base. then, these data are statistically analyzed. the turbulent kinetic energy redistribution is studied using the pressure-stra...

متن کامل

Numerical simulation of pulsating turbulent channel flow

Direct and large-eddy simulations of the Navier–Stokes equations are used to study the pulsating flow in a channel. The cases examined span a wide range of frequencies of the driving pressure gradient, and encompass different physical behaviors, from the quasi-Stokes flow observed at high frequencies, to a quasisteady behavior at the lowest ones. The validity of the dynamic Smagorinsky model to...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Physics of Fluids

سال: 2021

ISSN: ['1527-2435', '1089-7666', '1070-6631']

DOI: https://doi.org/10.1063/5.0035656