Pulsatile pipe flow transition: Flow waveform effects

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.

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Engineering Simulation Tests on Multiphase Flow in Middle- and High-Yield Slanted Well Bores

Energies ◽

10.3390/en11102591 ◽

2018 ◽

Vol 11 (10) ◽

pp. 2591 ◽

Cited By ~ 3

Author(s):

Dan Qi ◽

Honglan Zou ◽

Yunhong Ding ◽

Wei Luo ◽

Junzheng Yang

Keyword(s):

Multiphase Flow ◽

Prediction Model ◽

Flow Pattern ◽

Pipe Flow ◽

Slug Flow ◽

High Yield ◽

Transition Flow ◽

Liquid Holdup ◽

Flow Pattern Map ◽

Flow Pressure

Previous multiphase pipe flow tests have mainly been conducted in horizontal and vertical pipes, with few tests conducted on multiphase pipe flow under different inclined angles. In this study, in light of mid–high yield and highly deviated wells in the Middle East and on the basis of existent multiphase flow pressure research on well bores, multiphase pipe flow tests were conducted under different inclined angles, liquid rates, and gas rates. A pressure prediction model based on Mukherjee model, but with new coefficients and higher accuracy for well bores in the study block, was obtained. It was verified that the newly built pressure drawdown prediction model tallies better with experimental data, with an error of only 11.3%. The effect of inclination, output, and gas rate on the flow pattern, liquid holdup, and friction in the course of multiphase flow were analyzed comprehensively, and six kinds of classical flow regime maps were verified with this model. The results showed that for annular and slug flow, the Mukherjee flow pattern map had a higher accuracy of 100% and 80–100%, respectively. For transition flow, Duns and Ros flow pattern map had a higher accuracy of 46–66%.

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

Journal of Fluids Engineering ◽

10.1115/1.2835502 ◽

1996 ◽

Vol 118 (4) ◽

pp. 729-735 ◽

Cited By ~ 4

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.

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On the laminar to turbulent flow transition in diabatic helically coiled pipe flow

Experimental Thermal and Fluid Science ◽

10.1016/j.expthermflusci.2006.01.004 ◽

2006 ◽

Vol 30 (7) ◽

pp. 653-661 ◽

Cited By ~ 26

Author(s):

Andrea Cioncolini ◽

Lorenzo Santini

Keyword(s):

Turbulent Flow ◽

Pipe Flow ◽

Flow Transition

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Solutions to Two Problems of Pipe Flow

4th International Pipeline Conference, Parts A and B ◽

10.1115/ipc2002-27043 ◽

2002 ◽

Author(s):

Shouhong Wu ◽

Femi Ade

Keyword(s):

Pipe Flow ◽

Critical Flow ◽

Flow Transition ◽

Implicit Function ◽

Flow Depth ◽

Flow Discharge ◽

Practical Solution ◽

Solution Approach ◽

Approximation Errors ◽

Open Pipe

This paper assesses two aspects of liquid flow in pipes. The first aspect is the relation between pipe critical flow depth and flow discharge. The critical flow depth in a pipe is generally expressed as an implicit function. The paper proposes two simple expressions that can be used to explicitly express pipe critical flow depth as a function of pipe diameter and discharge. The approximation errors associated with these proposed expressions were found to be within 1.0%. The second aspect is the flow transition from open pipe flow to full pipe flow in a long pipe. Theoretically, when a pipe is close to flowing full, a given discharge may correspond to multiple head differences. This paper presents a practical solution approach that yields a unique solution for the pipe flow depth for a given discharge in the transition zone.

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