scholarly journals Investigation and prediction of slug flow characteristics in highly viscous liquid and gas flows in horizontal pipes

2015 ◽  
Vol 102 ◽  
pp. 124-137 ◽  
Author(s):  
Y. Zhao ◽  
L. Lao ◽  
H. Yeung
Keyword(s):  
Viscous Liquid ◽  
Slug Flow ◽  
Flow Characteristics ◽  
Gas Flows ◽  
Horizontal Pipes

Detailed Experimental Characterisation of Gas-Liquid Two-Phase Slug Flow in Horizontal Pipes

2012 ◽  
Author(s):  
Carlos E. F. do Amaral ◽  
Fernando Castillo ◽  
Marco José da Silva ◽  
Eduardo N. Santos ◽  
Rigoberto E. M. Morales
Keyword(s):  
Slug Flow ◽  
Flow Characteristics ◽  
Bubble Velocity ◽  
Two Phase ◽  
Horizontal Pipes ◽  
Horizontal Tubes ◽  
Piping Systems ◽  
Technological University ◽  
Thermal Sciences ◽  
Experimental Characterisation

Two phase flow occurs in many applications in industry, mainly in the transport of mixtures in pipes. The identification of these patterns is of fundamental importance in the design of piping systems and equipments. In this scenario, this work proposes an experimental study to identify multiphase flow patterns of water and air in horizontal tubes. The study was developed using an experimental circuit of 26 mm diameter and 9.2 m length pipe, at Thermal Sciences Lab at Federal Technological University of Paraná. To characterize the parameters one used an intrusive mesh electrodes sensor, a tomographic technique that allows details of the distribution of phases with good temporal and special resolution. Tests were conducted using several experimental settings of water and gas superficial flows, mostly with slug flow characteristics. Measurements were compared to models and the temporal void fraction series were analyzed to produce bubble velocity and frequency information, showing the characteristics for each two-phase pattern.

CFD modeling of air and highly viscous liquid two-phase slug flow in horizontal pipes

2018 ◽  
Vol 136 ◽  
pp. 638-653 ◽  
Author(s):  
H. Pineda-Pérez ◽  
T. Kim ◽  
E. Pereyra ◽  
N. Ratkovich
Keyword(s):  
Viscous Liquid ◽  
Slug Flow ◽  
Cfd Modeling ◽  
Two Phase ◽  
Horizontal Pipes

Pipe Inclination Effects on Slug Flow Characteristics of High Viscosity Oil-Gas Two-Phase Flow for Near Horizontal Pipes

2017 ◽  
Author(s):  
Samet Ekinci ◽  
T. B. Aydin ◽  
C. Sarica ◽  
E. Pereyra ◽  
T. Kim
Keyword(s):  
Slug Flow ◽  
Two Phase Flow ◽  
Flow Characteristics ◽  
High Viscosity ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Pipes ◽  
High Viscosity Oil ◽  
Oil Gas ◽  
Pipe Inclination

An experimental study of the inclination angle (±2° from horizontal) effects on high viscosity oil and gas two-phase flow has been conducted, and the available multiphase flow models/correlations have been evaluated using the acquired data. The effect of pipe inclination on the slug flow characteristics of highly viscous oil-gas two-phase flow was studied based on 1,040 data points covering a wide range of experimental conditions and liquid viscosities in a 50.8-mm-ID pipe at 2° downward and upward inclinations from horizontal. The oil viscosity ranged from 155 cP to 587 cP. Superficial liquid and gas velocities varied from 0.1 m/s to 0.8 m/s and from 0.1 m/s to 5 m/s, respectively. The basic two-phase flow parameters and slug flow characteristics have been analyzed and compared with the past studies conducted for near horizontal pipes.

scholarly journals Research on the Dynamic Responses of Simply Supported Horizontal Pipes Conveying Gas-Liquid Two-Phase Slug Flow

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 83
Author(s):  
Gang Liu ◽  
Zongrui Hao ◽  
Yueshe Wang ◽  
Wanlong Ren
Keyword(s):  
Slug Flow ◽  
Peak Frequency ◽  
Dynamic Responses ◽  
Piping System ◽  
Transverse Displacement ◽  
Vibration Acceleration ◽  
Two Phase ◽  
Horizontal Pipes ◽  
Simply Supported ◽  
Superficial Gas Velocity

The dynamic responses of simply supported horizontal pipes conveying gas-liquid two-phase slug flow are explored. The intermittent characteristics of slug flow parameters are mainly considered to analyze the dynamic model of the piping system. The results show that the variations of the midpoint transverse displacement could vary from periodic-like motion to a kind of motion whose amplitude increases as time goes on if increasing the superficial gas velocity. Meanwhile, the dynamic responses have certain relations with the vibration acceleration. By analyzing the parameters in the power spectrum densities of vibration acceleration such as the number of predominant frequencies and the amplitude of each peak frequency, the dynamic behaviors of the piping system like periodicity could be calculated expediently.

Initiation and Statistical Evolution of Horizontal Slug Flow With a Two-Fluid Model

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
A. O. Nieckele ◽  
J. N. E. Carneiro ◽  
R. C. Chucuya ◽  
J. H. P. Azevedo
Keyword(s):  
Experimental Data ◽  
Slug Flow ◽  
Fluid Model ◽  
Subsequent Development ◽  
Complex Flow ◽  
Horizontal Pipes ◽  
Dimensional Version ◽  
Two Fluid Model ◽  
Log Normal ◽  
Two Fluid

In the present work, the onset and subsequent development of slug flow in horizontal pipes is investigated by solving the transient one-dimensional version of the two-fluid model in a high resolution mesh using a finite volume technique. The methodology (named slug-capturing) was proposed before in the literature and the present work represents a confirmation of its applicability in predicting this very complex flow regime. Further, different configurations are analyzed here and comparisons are performed against different sets of experimental data. Predictions for mean slug variables were in good agreement with experimental data. Additionally, focus is given to the statistical properties of slug flows such as shapes of probability density functions of slug lengths (which were represented by gamma and log-normal distributions) as well as the evolution of the first statistical moments, which were shown to be well reproduced by the methodology.

scholarly journals Effects of Selection of Inlet Perturbations, Multiphase and Turbulence Equations on Slug Flow Characteristics Using Altair® AcuSolve™

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2152
Author(s):  
Mohammad Sobir Abdul Basith ◽  
Nabihah Sallih ◽  
William Pao King Soon ◽  
Shinji Thomas Shibano ◽  
Ramesh Singh ◽  
...  
Keyword(s):  
Level Set ◽  
Slug Flow ◽  
Fluid Dynamic ◽  
Flow Characteristics ◽  
Convective Transport ◽  
Experimental Result ◽  
Internal Boundary ◽  
Published Data ◽  
Level Set Function ◽  
Selection Of

Selection of inlet perturbations, multiphase equations, and the turbulence equation may affect the development of slug flow using computational fluid dynamic simulation tools. The inlet perturbation, such as sinusoidal and random perturbations, play an essential role in inducing slug formation. Multiphase equations such as volume of fluid and level set methods are used to track and capture the gas-liquid immiscible interface. Similarly, turbulence equations such as Spalart Allmaras (SA), Detached Eddy Simulations (DES), k-omega, and k-epsilon can be used to predict the evolution of turbulence within the flow. At present, no direct comparison is available in the literature on the selection of (i) types of inlet perturbations, (ii) the choice of multiphase equations, and (iii) the turbulence equation on the development of slug flow using the Altair computational package. This article aims to compare the effects of the selection of inlet perturbations, multiphase models and turbulence equations on slug flow characteristics using Altair® AcuSolve™. The findings by Altair® simulation were compared to published experimental data and simulation works using ANSYS and STAR-CCM+. The slug flow characteristics of interest include slug morphology, a body length-to-diameter ratio, velocity, frequency, and pressure gradient. It was found that the slug flow could be developed for all combinations of settings. Although level set approach in Altair® can track fluid motion successfully, it has a limitation in modelling the convective transport of the multiphase mixture well, unlike ANSYS and STAR-CCM+. Compared to the standard level set method, the coupling of back-and-forth error compensation and correction with the level set function helps to capture the internal boundary more accurately by reducing errors caused by numerical diffusion in the transport of the level set. It was revealed that the Spalart Allmaras turbulence equation could mimic published experimental result better than DES as it produced the closest slug translational velocity. Since the frequency of the slugs for the developed models showed a good agreement with the published data, the models could be sufficient for the investigation of fluid-structure interaction.

Modeling of Wall Friction for Multispecies Solid-Gas Flows

1986 ◽  
Vol 108 (4) ◽  
pp. 486-488 ◽  
Author(s):  
E. D. Doss ◽  
M. G. Srinivasan
Keyword(s):  
Shear Stress ◽  
Flow Model ◽  
Flow Characteristics ◽  
Wall Friction ◽  
Gas Flows ◽  
Two Phase ◽  
One Dimensional ◽  
Friction Models ◽  
Wall Interaction ◽  
The One

The empirical expressions for the equivalent friction factor to simulate the effect of particle-wall interaction with a single solid species have been extended to model the wall shear stress for multispecies solid-gas flows. Expressions representing the equivalent shear stress for solid-gas flows obtained from these wall friction models are included in the one-dimensional two-phase flow model and it can be used to study the effect of particle-wall interaction on the flow characteristics.

scholarly journals Intermediate Gas Feed in Bi- or Triphasic Gas–Liquid(–Liquid) Segmented Slug Flow Capillary Reactors

Symmetry ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2092
Author(s):  
Niclas von Vietinghoff ◽  
David Hellmann ◽  
Jan Priebe ◽  
David W. Agar
Keyword(s):  
Success Rate ◽  
Flow Pattern ◽  
Slug Flow ◽  
Flow Characteristics ◽  
Process Intensification ◽  
Gas Bubbles ◽  
Electrolysis Cell ◽  
Segmented Flow ◽  
Good Potential ◽  
Flow Capillary

Segmented slug flow systems in capillaries have already shown good potential for process intensification, due to their symmetry in the characteristic flow pattern. However, several challenges remain in this technology. For instance, in gas-consuming reactions, like Aliq + Bgas→Cliq, the gas droplets shrink and may even disappear, limiting the conversions and throughputs of capillary reactor systems. To overcome such shortcomings, an intermediate gas feed was developed. In order to maintain the well-defined slug flow characteristics, it is necessary to introduce the gas rapidly and precisely, in small aliquots of <10 µL. This allows us to preserve the well-defined alternating triphasic slug flow. A miniaturized electrolysis cell, together with a flow-observing system, was thus devised and implemented successfully as an intermediate gas feed. Feeding a new gas droplet into an existing liquid–liquid segmented flow had a success rate of up to 99%, whereas refilling an existing gas droplet is often limited by a lack of coalescence. Here, only at low volumetric flows, 70% of the gas bubbles were refilled by coalescence.

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