scholarly journals Simultaneous imaging of two-phase velocities in particle-laden flows by two-color optical phase discrimination

2021 ◽  
Author(s):  
Xiaopeng Bi ◽  
Zhiwei Sun ◽  
Timothy Lau ◽  
Zeyad Alwahabi ◽  
G.J. 'Gus' Nathan
Keyword(s):  
Two Phase ◽  
Optical Phase ◽  
Simultaneous Imaging ◽  
Phase Velocities ◽  
Phase Discrimination ◽  
Particle Laden Flows

Simultaneous two-phase PIV by two-parameter phase discrimination

2002 ◽  
Vol 32 (2) ◽  
pp. 252-268 ◽  
Author(s):  
D. A. Khalitov ◽  
E. K. Longmire
Keyword(s):  
Two Phase ◽  
Phase Discrimination ◽  
Two Parameter

Hydrodynamic Studies of Two-Phase Upflow in Vertical Pipelines

1969 ◽  
Vol 184 (3) ◽  
pp. 154-165
Author(s):  
J. C. Jepsen ◽  
J. L. Ralph
Keyword(s):  
Experimental Data ◽  
Liquid Phase ◽  
Mass Flux ◽  
Annular Flow ◽  
Impact Pressure ◽  
Two Phase ◽  
Phase Velocities ◽  
Flow Disturbances ◽  
Liquid Flux ◽  
Liquid Systems

The object of this study was to obtain data on the radial variation of gas- and liquid-phase mass flux profiles in two-phase upflow in vertical pipelines. Experimental data were obtained on the radial gas-liquid flux, impact pressure, and linear liquid-phase velocity profiles for superficial gas- and liquid-phase velocities ranging from 20 to 125 ft/s and from 5 to 15 ft/s, respectively. Studies were made on 1-in, 4-in, and 8·4-in vertical pipelines and in a 1-in i.d. by 8·4-in o.d. vertical annular flow pipeline. Gas-liquid systems studied were air-water, air-aqueous glycerol, and air-tetrabromoethane. In Part 2 time-averaged radial liquid hold-up and linear-phase velocities were estimated from radial mass flux and impact pressure data. Estimates were also made on the magnitude, frequency, and velocity of the flow disturbances. Empirical correlations for mean liquid hold-up and pressure drop were developed from experimental data.

scholarly journals An Experimental Data Base for the Computational Fluid Dynamics of Reacting and Nonreacting Methanol Sprays

1995 ◽  
Vol 117 (1) ◽  
pp. 145-153 ◽  
Author(s):  
V. G. McDonell ◽  
G. S. Samuelsen
Keyword(s):  
Data Base ◽  
Gas Phase ◽  
Vapor Concentration ◽  
Data Sets ◽  
Size Distributions ◽  
Two Phase ◽  
Data Set ◽  
Phase Velocities ◽  
Spray Structure ◽  
Droplet Size Distributions

The present data set consists of detailed measurements obtained within methanol sprays produced by a research atomizer which is operated with three atomizing air modes: none, non-swirling, and swirling. In addition, the cases with nonswirling and swirling atomizing air are characterized under reacting conditions. In each case, state-of-the-art diagnostics are applied. Measurements of the gas phase velocities in both the single and two-phase cases, droplet size distributions, and vapor concentration are obtained. The data are reported in a standardized format to ensure usefulness as modeling challenges. The results obtained reveal the presence of significant interaction between phases and significant changes in spray structure as a result of altering the atomizing air characteristics. Efforts have been directed toward delineation of errors and comparison with existing data sets where possible. The results is a comprehensive data base for vaporizing sprays under reacting and non-reacting conditions which permit a systematic variation in aerodynamic effects to be explored.

Simultaneous Measurement of Two-Phase Velocities in Particle Laden Water Jet by Means of PIV

2003 ◽  
Vol 2003.6 (0) ◽  
pp. 307-308
Author(s):  
Tsuneaki ISHIMA ◽  
Toshimichi ARAI ◽  
Toru YAMAMOTO ◽  
Tomio OBOKATA
Keyword(s):  
Simultaneous Measurement ◽  
Water Jet ◽  
Two Phase ◽  
Phase Velocities

Void Fraction during Two-Phase Flow

1973 ◽  
Vol 15 (3) ◽  
pp. 235-236 ◽  
Author(s):  
D. Chisholm
Keyword(s):  
Pressure Gradient ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Homogeneous Equation ◽  
Phase Flow ◽  
Two Phase ◽  
Phase Velocities

From consideration of the homogeneous equation for frictional pressure gradient, and the relation between friction and void fraction, an equation for the ratio of the phase velocities during two-phase flow, is developed which is interesting in form, easy to use, and agrees with experiment.

scholarly journals CALCULATION OF TWO-SPEED FLOW OF TWO-PHASE OPEN FLOW

2020 ◽  
Vol 6 (444) ◽  
pp. 203-212
Author(s):  
E. A. Nysanov ◽  
◽  
Zh. S. Kemelbekova ◽  
O. M. Ibragimov ◽  
A. E. Kozhabekova ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Free Surface ◽  
Longitudinal Velocity ◽  
Solid Particles ◽  
Empirical Formulas ◽  
Longitudinal Velocity Component ◽  
Two Phase ◽  
Method Of Calculation ◽  
Phase Velocities ◽  
Speed Flow

In this article the mathematical model of unsteady flow the two-phase open stream taking into account the redistribution of the particulate concentration, the depth of flow and water filtration on the bottom of the channel, and also created an efficient method of calculation. In this case, the two-speed flow is considered, i.e. the presence of the longitudinal and vertical components of the phase velocities is taken into account, and we also believe that the flow parameters along the flow do not change. Initial and boundary conditions are established based on theoretical and empirical formulas, which are widely used in practice. The flow in open channels is non-pressurized, occurs under the influence of gravity and is characterized by the fact that the flow has a free surface. At the initial moment of time, we consider the flow to be uniform in the longitudinal direction and all parameters are set by known theoretical and empirical formulas. At the bottom of the channel for longitudinal velocity component of the water use condition of adhesion, and for the longitudinal velocity component of solid phase condition for the shift and believe the known concentrations of solid particles, and vertical components of velocity the phases of the filtering conditions (for water), and hydraulic size (for solid particles). On the free surface, we consider that there are no solid particles, and for the longitudinal components of the phase velocities we neglect the force of air friction, and for the vertical components of the phase velocities we use the condition of non-uniformity of the free surface in time. On the basis of the developed mathematical model and the created method of calculation, the changes of the main parameters in the depth of the flow and in time are determined.

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