Discussion: “Transient Gas-Liquid Flow in Upward Sloping Pipes, Approaching the Wavy-to-Slug Flow Transition” (Grolman, E., and Fortuin, J. M. H., 1996, ASME J. Fluids Eng., 118, pp. 729–735)

1996 ◽  
Vol 118 (4) ◽  
pp. 646-646
Author(s):  
W. J. Meiring
Keyword(s):  
Liquid Flow ◽  
Slug Flow ◽  
Flow Transition ◽  
Gas Liquid Flow

scholarly journals Slug Flow Transition in Horizontal Gas-Liquid Flow

1984 ◽  
Vol 27 (234) ◽  
pp. 2771-2778
Author(s):  
Eiji HIHARA ◽  
Takamoto SAITO
Keyword(s):  
Liquid Flow ◽  
Slug Flow ◽  
Flow Transition ◽  
Gas Liquid Flow

Surfactant Use for Slug Flow Pattern Suppression in a Horizontal Pipe

2003 ◽  
Author(s):  
R. J. Wilkens ◽  
S. R. Glassmeyer ◽  
G. J. Rosebrock ◽  
K. M. Storage ◽  
T. M. Storage
Keyword(s):  
Flow Pattern ◽  
Liquid Flow ◽  
Pipe Flow ◽  
Slug Flow ◽  
Flow Patterns ◽  
Flow Transition ◽  
Horizontal Pipe ◽  
Surfactant Additive ◽  
Gas Liquid Flow

A set of experiments was performed to study flow pattern suppression in gas-liquid pipe flow by means of surfactant additive. Results suggest that addition of the surfactant to gas-liquid flow significantly reduces the occurrence of slug flow. In addition, previously unreported flow patterns were observed to exist between slug and dispersed bubble flows. It is concluded that new mechanisms for slug flow transition need to be considered.

Surfactant Use for Slug Flow Pattern Suppression and New Flow Pattern Types in a Horizontal Pipe

2005 ◽  
Vol 128 (1) ◽  
pp. 164-169 ◽  
Author(s):  
R. J. Wilkens ◽  
D. K. Thomas ◽  
S. R. Glassmeyer
Keyword(s):  
Flow Pattern ◽  
Liquid Flow ◽  
Pipe Flow ◽  
Slug Flow ◽  
Flow Patterns ◽  
Flow Transition ◽  
Water Pipe ◽  
Horizontal Pipe ◽  
Surfactant Additive ◽  
Gas Liquid Flow

A set of experiments was performed to study flow pattern suppression in horizontal air-water pipe flow by means of surfactant additive. Results suggest that addition of the surfactant to the gas-liquid flow significantly reduces the occurrence of slug flow. In addition, previously unreported flow patterns were observed to exist between slug and dispersed bubble flows. It is concluded that new mechanisms for slug flow transition need to be considered.

Transient Gas-Liquid Flow in Upward Sloping Pipes, Approaching the Wavy-to-Slug Flow Transition

1996 ◽  
Vol 118 (4) ◽  
pp. 729-735 ◽  
Author(s):  
Eric Grolman ◽  
Jan M. H. Fortuin
Keyword(s):  
Steady State ◽  
Pipe Flow ◽  
Slug Flow ◽  
Transient Behavior ◽  
Hyperbolic Partial Differential Equations ◽  
Shear Stresses ◽  
Flow Transition ◽  
Interfacial Areas ◽  
On Line ◽  
Gas Liquid Flow

A model is presented for transient, cocurrent gas-liquid pipe flow in the stratified-smooth and stratified-wavy flow regimes. It is based on the equations of continuity and motion in the direction of flow and results in two hyperbolic partial differential equations, which are solved numerically using the combined methods of lines (Schiesser, 1991) and characteristics (Stoker, 1957). In wavy gas-liquid pipe flow, three different interfacial areas and corresponding shear stresses are identified. Three friction-factor correlations were derived on the basis of an extensive set of 2500 steady-state measurements. The transient behavior of inclined gas-liquid pipe flow is successfully simulated and compares well with the results obtained from on-line measurements, right up to the onset of slug flow.

CFD Analysis on Taylor Slug Flow Through 3D Vertical Mini-Channel

2011 ◽  
Author(s):  
Hemant B. Mehta ◽  
Jyotirmay Banerjee ◽  
Mehul P. Bambhania ◽  
Jay B. Desai
Keyword(s):  
Heat Transfer ◽  
Liquid Flow ◽  
Slug Flow ◽  
Dominant Role ◽  
Contact Angles ◽  
Radial Heat ◽  
Flow Through ◽  
Third Dimension ◽  
Gas Liquid Flow ◽  
Inlet Angle

The hydrodynamic behavior of a gas-liquid flow through circular mini-channel is studied. The gas-liquid flow in Taylor slug flow regime for a mini-channel is modeled using volume of fluids method. The Taylor slug length has direct influence on radial heat transfer and heat transfer rate. So it is important to study the characteristic of such flow regimes. The simulation is carried out first with 2D geometry. The results are then obtained in order to appreciate the effect of third dimension on hydrodynamics of Taylor’s slug flow. The effect of different inlet geometries is studied by varying the inlet angle to the main channel which includes 60°, 90°, 120° and 180° angular orientations. The effect of different gas and liquid velocities (0.01m/s, 0.025m/s, 0.05m/s, 0.1m/s), the effect of channel size (0.5mm, 1mm, 2mm, 4mm), and the effect of diverse contact angles (0°, 30°, 60°, 90°, 120°, 135°) are simulated and studied. Simulation results show that surface tension plays a dominant role in determining the slug properties. Liquid wall contact angle is important parameter in determining the slug shape and size. This study will be useful in proper selection and configuration of mini-channel for gas-liquid mass transfer and reaction.

Continuous Wavelet Transforms of Instantaneous Wall Pressure in Slug and Churn Upward Gas-Liquid Flow

2002 ◽  
Vol 124 (3) ◽  
pp. 625-633 ◽  
Author(s):  
Heather L. McClusky ◽  
Mary V. Holloway ◽  
Donald E. Beasley ◽  
Jay M. Ochterbeck
Keyword(s):  
Liquid Flow ◽  
Wavelet Transforms ◽  
Slug Flow ◽  
Time Dependent ◽  
Continuous Wavelet ◽  
Frequency Content ◽  
Flow Conditions ◽  
Continuous Wavelet Transforms ◽  
Gas Liquid Flow ◽  
Churn Flow

Continuous wavelet transforms are employed to determine the time-localized frequency content (scalogram) of instantaneous wall pressure signals in upward gas-liquid flow. The flow conditions correspond to well-defined slug flow, well-defined churn flow, and flows near the transition from slug-to-churn flow. Scalograms demonstrate that the frequency content of the pressure signals is time-dependent, and visual observations of the flow conditions suggest that the time-dependent frequencies are related to identifiable physical behaviors of the flow. In well-defined slug flow, the scalograms are characterized by the presence of a dominant frequency throughout the duration of the signal and by frequency shifting events. Scalograms representing well-defined churn flow contain intermittent frequencies, and the energy density in churn flow is spread over a wider range of frequencies than in slug flow. The present results provide evidence that flows near transition alternately display characteristics of both well-defined slug and well-defined churn flows.

scholarly journals FLOW STRUCTURE IN THE HORIZONTAL SLUG FLOW

2004 ◽  
Vol 3 (2) ◽  
pp. 151 ◽  
Author(s):  
E. S. Rosa
Keyword(s):  
Flow Structure ◽  
Liquid Flow ◽  
Slug Flow ◽  
Cell Structure ◽  
Relative Length ◽  
Unit Cell ◽  
Bubble Velocity ◽  
Experimental Database ◽  
Experimental Apparatus ◽  
Gas Liquid Flow

Successions of long gas bubbles and liquid slugs form the so-called slug flow pattern in a gas-liquid flow. A unit cell encompassing one gas bubble and one liquid slug characterizes this alternating gas-liquid flow. The kinematic and dynamic flow mechanisms responsible for the interactions between the successive unit cells are still an open question. Inside this context, this work addresses specifically to the bubble velocity, the bubble to bubble interactions and the entrance mechanisms. Within an experimental framework the spatial evolution of each unit cell structure is individualized during the acquisition period. The experimental apparatus consisted of a 23.4 m long transparent Plexiglas pipe, 26mm ID, which means a total relative length of 900 free diameters. The air and water were mixed at the inlet of the test section and discharged into a collecting tank open to the atmosphere. The instantaneous measurements of the flow structure were made with double-wire conductive probes. The probes were installed in four measuring stations; each station had two probes slightly apart. The measuring stations were located at 127D, 273D, 506D e 777D from the mixer. The experimental database is further processed to give rise to histograms and correlations among flow variables

Sign in / Sign up

Export Citation Format

Share Document