Multi-scale particle dynamics of low air velocity in a horizontal self-excited gas–solid two-phase pipe flow

An experimental investigation of a two-phase pipe flow was undertaken to study kinematic and dynamic parameters of the fluid and solid phases. To accomplish this, a two-color digital particle image velocimetry and accelerometry (DPIV∕DPIA) methodology was used to measure velocity and acceleration fields of the fluid phase and solid phase simultaneously. The simultaneous, two-color DPIV∕DPIA measurements provided information on the changing characteristics of two-phase flow kinematic and dynamic quantities. Analysis of kinematic terms indicated that turbulence was suppressed due to the presence of the solid phase. Dynamic considerations focused on the second and third central moments of temporal acceleration for both phases. For the condition studied, the distribution across the tube of the second central moment of acceleration indicated a higher value for the solid phase than the fluid phase; both phases had increased values near the wall. The third central moment statistic of acceleration showed a variation between the two phases with the fluid phase having an oscillatory-type profile across the tube and the solid phase having a fairly flat profile. The differences in second and third central moment profiles between the two phases are attributed to the inertia of each particle type and its response to turbulence structures. Analysis of acceleration statistics provides another approach to characterize flow fields and gives some insight into the flow structures, even for steady flows.

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Multi-scale modeling of dispersed gas–liquid two-phase flow

Chemical Engineering Science ◽

10.1016/j.ces.2004.01.038 ◽

2004 ◽

Vol 59 (8-9) ◽

pp. 1853-1861 ◽

Cited By ~ 110

Author(s):

N.G. Deen ◽

M. van Sint Annaland ◽

J.A.M. Kuipers

Keyword(s):

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Multi Scale ◽

Scale Modeling ◽

Multi Scale Modeling

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PIV measurements of waves and turbulence in stratified horizontal two-phase pipe flow

International Journal of Multiphase Flow ◽

10.1016/j.ijmultiphaseflow.2014.03.001 ◽

2014 ◽

Vol 62 ◽

pp. 161-173 ◽

Cited By ~ 30

Author(s):

M. Birvalski ◽

M.J. Tummers ◽

R. Delfos ◽

R.A.W.M. Henkes

Keyword(s):

Pipe Flow ◽

Two Phase ◽

Piv Measurements

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Two Algorithms for Solving Coupled Particle Dynamics and Flow Field Equations in Two-Phase Flows

ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B ◽

10.1115/fedsm-icnmm2010-30443 ◽

2010 ◽

Author(s):

R. Kamali ◽

S. A. Shekoohi

Keyword(s):

Flow Field ◽

Particle Dynamics ◽

Fluid Particle ◽

Navier Stokes ◽

Test Cases ◽

Particle Interactions ◽

Field Equations ◽

Two Phase ◽

Coupled Equations ◽

Solution Accuracy

Two methods for solving coupled particle dynamics and flow field equations simultaneously by considering fluid-particle interactions to simulate two-phase flow are presented and compared. In many conditions, such as magnetic micro mixers and shooting high velocity particles in fluid, the fluid-particle interactions can not be neglected. In these cases it is necessary to consider fluid-particle interactions and solve the related coupled equations simultaneously. To solve these equations, suitable algorithms should be used to improve convergence speed and solution accuracy. In this paper two algorithms for solving coupled incompressible Navier-Stokes and particle dynamics equations are proposed and their efficiencies are compared by using them in a computer program. The main criterion that is used for comparison is the time they need to converge for a specific accuracy. In the first algorithm the particle dynamics and flow field equations are solved simultaneously but separately. In the second algorithm in each iteration for solving flow field equations, the particle dynamics equation is also solved. Results for some test cases are presented and compared. According to the results the second algorithm is faster than the first one especially when there is a strong coupling between phases.

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Towards Large Multi-scale Particle Simulations with Conjugate Heat Transfer on Heterogeneous Super Computers

High Performance Computing in Science and Engineering ‘14 ◽

10.1007/978-3-319-10810-0_21 ◽

2014 ◽

pp. 307-319

Author(s):

Gonzalo Brito Gadeschi ◽

Christoph Siewert ◽

Andreas Lintermann ◽

Matthias Meinke ◽

Wolfgang Schröder

Keyword(s):

Heat Transfer ◽

Conjugate Heat Transfer ◽

Multi Scale ◽

Particle Simulations ◽

Scale Particle

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Measuring Flow Pattern Asymmetry of Oil-Water Two Phase Flows Using Multi-channel Rotating Electric Field Conductance Signals

Zeitschrift für Naturforschung A ◽

10.1515/zna-2018-0312 ◽

2018 ◽

Vol 74 (1) ◽

pp. 25-41 ◽

Cited By ~ 2

Author(s):

Yuansheng He ◽

Yingyu Ren ◽

Yunfeng Han ◽

Ningde Jin

Keyword(s):

Electric Field ◽

Flow Pattern ◽

Cross Section ◽

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Time Asymmetry ◽

Pipe Cross Section ◽

Multi Scale ◽

Oil Water

AbstractThe present study is a report on the asymmetry of dispersed oil phase in vertical upward oil-water two phase flow. The multi-channel signals of the rotating electric field conductance sensor with eight electrodes are collected in a 20-mm inner diameter pipe, and typical images of low pattern are captured using a high speed camera. With the multi-channel rotating electric field conductance signals collected at pipe cross section, multi-scale time asymmetry (MSA) and an algorithm of multi-scale first-order difference scatter plot are employed to uncover the fluid dynamics of oil-water two phase flow. The results indicate that MSA can characterise the non-linear behaviours of oil-water two phase flow. Besides, the MSA analysis also beneficial for understanding the underlying inhomogeneous distribution of the flow pattern in different directions at pipe cross section.

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