Enhancement of the Drift-Flux Model for gas-liquid slug flow in a long vertical pipe

2019 ◽  
Vol 110 ◽  
pp. 50-58 ◽  
Author(s):  
Valery Yu. Liapidevskii ◽  
Vadim S. Tikhonov
Keyword(s):  
Slug Flow ◽  
Liquid Slug ◽  
Vertical Pipe ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Flux Model

scholarly journals Pressure Pulse Propagation in Two-Component Slug Flow

1979 ◽  
Vol 101 (1) ◽  
pp. 44-52 ◽  
Author(s):  
C. Samuel Martin ◽  
M. Padmanabhan
Keyword(s):  
Simple Model ◽  
Slug Flow ◽  
Pulse Propagation ◽  
Pressure Pulse ◽  
Center Of Mass ◽  
Homogeneous Model ◽  
Propagation Speed ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Flux Model

The simple model of pressure pulse propagation in slug flow proposed by Henry, Grolmes, and Fauske has been extended by considering wave reflection and wave transmission at gas-liquid interfaces. A frequency-response model applied to a series of idealized gas and liquid slugs yields a pulse propagation speed that approaches the homogeneous model value as the number of slugs is increased for a given void fraction. All characteristic roots from the solution to a three-equation drift-flux model are related to the velocity of the center of mass of the mixture. The pulse propagation speed relative to this velocity is exactly equal to the homogeneous model value, however. Measured pulse propagation speeds in vertically downward slug flow are, as anticipated, much less than those predicted by the simple model of Henry, Grolmes, and Fauske, but slightly greater than the homogeneous model value. Measured pressure surges produced by the rapid closure of a downstream valve in a pipeline are reasonably well predicted by the drift-flux model. For the range of void fractions, pressures, and velocities encountered in this study, it is concluded that pressure pulse speeds and the magnitude of pressure surges in slug flow can be adequately predicted by a homogeneous model.

Interfacial Structures and Regime Transition in Co-Current Downward Bubbly Flow

2004 ◽  
Vol 126 (4) ◽  
pp. 528-538 ◽  
Author(s):  
S. Kim ◽  
S. S. Paranjape ◽  
M. Ishii ◽  
J. Kelly
Keyword(s):  
Two Phase Flow ◽  
Bubbly Flow ◽  
Superficial Velocity ◽  
Phase Flow ◽  
Two Phase ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Flow Parameters ◽  
Interfacial Structures ◽  
Flux Model

The vertical co-current downward air-water two-phase flow was studied under adiabatic condition in round tube test sections of 25.4-mm and 50.8-mm ID. In flow regime identification, a new approach was employed to minimize the subjective judgment. It was found that the flow regimes in the co-current downward flow strongly depend on the channel size. In addition, various local two-phase flow parameters were acquired by the multi-sensor miniaturized conductivity probe in bubbly flow. Furthermore, the area-averaged data acquired by the impedance void meter were analyzed using the drift flux model. Three different distributions parameters were developed for different ranges of non-dimensional superficial velocity, defined by the ration of total superficial velocity to the drift velocity.

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