Liquid-phase axial mixing in two-phase horizontal pipe flow

One-dimensional (1D), equilibrium-based mechanistic model predictions are compared to three-dimensional (3D) transient computational fluid dynamics results for horizontal two-phase, gas-liquid pipe flow. The 3D regions of interest include both those expected to be in equilibrium conditions and those where transitions between flow regimes occur. Equilibrium simulations, such as those for stratified flow in a horizontal pipe, allow crucial validation of the equilibrium-based closure relations by means of numerical experiments. In the transitional regions, fully 3D, time-dependent numerical simulations provide a means to estimate the error in the equilibrium-based models and suggest how reasonable approximations can be made in these regions.

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Application of D-S evidence theory in flow regime identification of two-phase horizontal pipe flow

10.1109/chicc.2008.4605562 ◽

2008 ◽

Cited By ~ 2

Author(s):

Zhang Fusheng ◽

Dong Feng

Keyword(s):

Flow Regime ◽

Pipe Flow ◽

Evidence Theory ◽

Two Phase ◽

Horizontal Pipe ◽

Flow Regime Identification

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Laminar–turbulent transition and wave–turbulence interaction in stratified horizontal two-phase pipe flow

Journal of Fluid Mechanics ◽

10.1017/jfm.2015.483 ◽

2015 ◽

Vol 780 ◽

pp. 439-456 ◽

Cited By ~ 9

Author(s):

M. Birvalski ◽

M. J. Tummers ◽

R. Delfos ◽

R. A. W. M. Henkes

Keyword(s):

Liquid Phase ◽

Small Amplitude ◽

Transition Process ◽

Wave Pattern ◽

Transition To Turbulence ◽

Cocurrent Flow ◽

Two Phase ◽

Horizontal Pipe ◽

Turbulent Transition ◽

Laminar Turbulent Transition

Stratified cocurrent flow of air and water was studied experimentally in a 5 cm diameter horizontal pipe. The velocity in the liquid phase was measured using planar particle image velocimetry, and the instantaneous interfacial profile was recorded using a separate camera. The resulting velocity fields extended from the pipe wall to the wavy interface. The principal aims of the study were to investigate the laminar–turbulent transition of the liquid phase in stratified gas–liquid flow, and to explore the interaction between the transition process and the interfacial waves. The boundaries of transition were determined in both the smooth and the wavy region. The occurrence of waves had the effect of increasing the Reynolds numbers at the end of transition. On the other hand, the transition to turbulence caused a change from the ‘2D small-amplitude’ to the ‘3D small-amplitude’ wave pattern, which were seen to correspond to the capillary–gravity and gravity–capillary solutions of the dispersion relationship respectively. In light of this, the flowmap of the wavy region was recast into Weber number–Froude number coordinates, which provided a physical interpretation of the interaction between the developing turbulence and the changing wave patterns.

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