Particle transport in a turbulent pipe flow: direct numerical ...
网页2023年2月9日 · In this paper, one of our aims is to determine the turbophoretic and diffusive flux directly from the PP-DNS of a particle-laden turbulent pipe flow. The time-evolving contributions of $D_1$ and $D_2$ are particularly unclear in the case of rebounding particle–wall collisions in conjunction with sharp concentration gradients that establish ...
Particle-fluid flow and distribution in a horizontal pipe with side ...
网页2023年3月1日 · The paper used the experiment and CFD-DEM approach to study particle-fluid flow in a horizontal pipe with six holes and reveal the corresponding particle distribution characteristics among holes. Experimental results were used to validate the reliability of the numerical method and calibrate model parameters.
Particle transport in turbulent curved pipe flow
网页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.
Flow regimes within horizontal particle-laden pipe flows
网页2021年10月1日 · Three different flow regimes for horizontal particle-laden pipe flows. • Three-dimensional regime map of the effects of the Stokes number, mass loading and Froude number on flow behaviour. • Critical flow regimes that gravity bias becomes either negligible or dominant for the fluid and particle dynamics. •
Gas‐particle flow in a vertical pipe with particle‐particle ...
网页A theory is presented for the fully-developed flow of gas and particles in a vertical pipe. The relation between gas pressure gradient and the flow rates of the two phases is predicted, over the whole range of cocurrent and countercurrent flows, together with velocity profiles for both phases and the radial concentration profile for the particles.
Motion of a Solid Particle in a Water Flow Inside a Pipe
网页2018年8月5日 · 1 Introduction. Two-phase solid-fluid flow is occurring in various industrial and natural applications. Recently, several firms launched subsea mining projects because of an increasing demand on mineral materials from emerging countries.
Flow regimes within horizontal particle-laden pipe flows
网页2021年10月1日 · This study presents numerical simulations for particle-laden gas–solid flows in horizontal circular pipes to identify the key flow regimes as a function of the main dimensionless parameters. A Euler–Lagrangian approach is employed, using direct numerical simulations (DNS) coupled with a Lagrangian particle tracking (LPT) method, to …
Particle Velocity and Acceleration in Turbulent Bent Pipe Flows
网页2015年8月21日 · We study the dynamics of dilute micro-size inertial particles in turbulent curved pipe flows of different curvature by means of direct numerical simulations with one-way coupled Lagrangian particle tracking. The focus of this work is on the first and second order moments of the velocity and acceleration of the particulate phase, relevant ...
网页2020年11月16日 · In this work we show that, for particle-laden pipe flows with large particle-to-pipe diameter ratios d/D ,the φ threshold for altering the transition is much lower than previously reported for smaller particles.
网页In particle-laden turbulent wall flows, transport of particles towards solid walls is phenomenologically thought to be governed by the wall-normal turbulence intensity supporting the underlying particle–eddy interactions that are usually modelled by a combination of turbophoresis and turbulent diffusion. We estimate the turbophoretic
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