scholarly journals A numerical study of gravity effects on horizontal particle-laden pipe flows

2020 ◽  
Author(s):  
Matthew Xinchen Zhang ◽  
Graham Nathan ◽  
Zhao Feng Tian ◽  
Rey Cheng Chin
Keyword(s):  
Numerical Study ◽  
Pipe Flows ◽  
Gravity Effects ◽  
Horizontal Particle

scholarly journals Numerical study of upward particulate pipe flows at a constant Reynolds number

2012 ◽  
Vol 62 (2) ◽  
pp. 97
Author(s):  
A Kartushinsky ◽  
Y Rudi ◽  
S Tisler ◽  
I Shcheglov ◽  
A Shablinsky
Keyword(s):  
Reynolds Number ◽  
Numerical Study ◽  
Pipe Flows

The influence of the coefficient of restitution on flow regimes within horizontal particle-laden pipe flows

2021 ◽  
Vol 33 (12) ◽  
pp. 123318
Author(s):  
Xinchen Zhang ◽  
Graham J. Nathan ◽  
Zhao F. Tian ◽  
Rey C. Chin
Keyword(s):  
Flow Regimes ◽  
Coefficient Of Restitution ◽  
Pipe Flows ◽  
Horizontal Particle

scholarly journals Numerical Study of Gravity Effects on Phase Separation in a Swirl Chamber

2016 ◽  
Author(s):  
Chao-Tsung Hsiao ◽  
Jingsen Ma ◽  
Georges L. Chahine
Keyword(s):  
Two Phase Flow ◽  
Numerical Study ◽  
Swirl Flow ◽  
Phase Flow ◽  
Cylinder Axis ◽  
Two Phase ◽  
Swirl Chamber ◽  
Gravity Effects ◽  
Acceleration Of Gravity ◽  
Phase Separator

The effects of gravity on a phase separator are studied numerically using an Eulerian/Lagrangian two-phase flow approach. The separator utilizes high intensity swirl to separate bubbles from the liquid. The two-phase flow enters tangentially a cylindrical swirl chamber and rotate around the cylinder axis. On earth, as the bubbles are captured by the vortex formed inside the swirl chamber due to the centripetal force, they also experience the buoyancy force due to gravity. In a reduced or zero gravity environment buoyancy is reduced or inexistent and capture of the bubbles by the vortex is modified. The present numerical simulations enable study of the relative importance of the acceleration of gravity on the bubble capture by the swirl flow in the separator. In absence of gravity, the bubbles get stratified depending on their sizes, with the larger bubbles entering the core region earlier than the smaller ones. However in presence of gravity, stratification is more complex as the two acceleration fields — due to gravity and to rotation — compete or combine during the bubble capture.

Numerical study of the blockage length effect on the transient wave in pipe flows

2018 ◽  
Vol 56 (2) ◽  
pp. 245-255 ◽  
Author(s):  
Ming Zhao ◽  
Mohamed S. Ghidaoui ◽  
Moez Louati ◽  
Huan-Feng Duan
Keyword(s):  
Numerical Study ◽  
Transient Wave ◽  
Length Effect ◽  
Pipe Flows

Numerical Study on Turbulence Modification in Particle-Laden Pipe Flows

2011 ◽  
Vol 130-134 ◽  
pp. 3603-3606
Author(s):  
Fu Sheng Yan ◽  
Wei Jun Zhang ◽  
Ru Quan Liang
Keyword(s):  
Experimental Data ◽  
Turbulent Flows ◽  
Pipe Flow ◽  
Numerical Study ◽  
Vertical Pipe ◽  
Pipe Flows ◽  
Dilute Gas ◽  
Turbulence Modification ◽  
Proposed Model ◽  
Simulation Results

This investigation deals with the study on the processes involved in the phenomenon about turbulence modification in dilute gas-particle turbulent flows. The proposed model, along with other selected turbulence modification models from the literature, is used to simulate a particle-laden vertical pipe flow. The simulation results show that the new model provides improved predictions of the experimental data.

An Experimental and Numerical Study of Turbulent Swirling Pipe Flows

1998 ◽  
Vol 120 (1) ◽  
pp. 54-61 ◽  
Author(s):  
R. R. Parchen ◽  
W. Steenbergen
Keyword(s):  
Angular Momentum ◽  
Velocity Distribution ◽  
Initial Velocity ◽  
Transport Model ◽  
Numerical Study ◽  
Second Order ◽  
Initial Velocity Distribution ◽  
Pipe Flows ◽  
Swirl Generator ◽  
Rate Of Decay

Both experimental and numerical studies have been performed aimed at the description of the decay of swirl in turbulent pipe flows. Emphasis is put on the effect of the initial velocity distribution on the rate of decay. The experiments show that, even far downstream of the swirl generator, the decay of the integral amount of angular momentum depends on the initial velocity distribution. This suggests that the description of the decay in terms of the widely suggested single exponential, function, is not sufficient. The calculations are based on (i) a standard k – ε model and (ii) models based on an algebraic transport model for the turbulent stresses. It appears that in a weakly swirling pipe flow, second-order models reduce to simple modifications of the standard k – ε model. While the standard k – ε model predicts a decay largely insensitive to the initial velocity distribution, the modified versions of the k – ε model, the ASM and the RSM, predict a strong sensitivity to the initial velocity distribution. Nevertheless, the standard k – ε model seems to predict the rate of decay of the swirl better than the second-order models. It is concluded that the corrections for the streamline curvature introduced by the second-order closures, largely overestimate the effect of rotation on the radial exchange of angular momentum.

Numerical Investigation of Swirling Pipe Flows

2006 ◽  
Author(s):  
Andrew Escue ◽  
Jie Cui
Keyword(s):  
Reynolds Stress ◽  
Swirling Flow ◽  
Numerical Study ◽  
Turbulence Models ◽  
Reynolds Stress Model ◽  
Swirling Flows ◽  
Stress Model ◽  
Straight Pipe ◽  
Engineering Applications ◽  
Pipe Flows

Swirling flow is a common phenomenon in engineering applications. It has been shown that swirling flow increases heat and mass transfer, and reduces power requirements in certain engineering applications. A numerical study of the swirling flow inside a straight pipe was carried out in the present work with the aid of the commercial CFD code Fluent. Two-dimensional simulations were performed, and two turbulence models were used, namely, the RNG k-ε model and the Reynolds stress model. Results at various swirling numbers were obtained and compared with available experimental data to determine if the numerical method is valid when modeling swirling flows. It has been shown that the RNG k-ε model is in better agreement with experimental velocity profiles for low swirl, while the Reynolds stress model becomes more appropriate as the swirl is increased. However, both turbulence models predict an unrealistic decay of the turbulence quantities for the flows considered here, indicating the inadequacy of such models in simulating developing pipe flows with swirl.

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