scholarly journals Momentum Flux in Two-Phase Flow

1968 ◽  
Vol 90 (2) ◽  
pp. 211-220 ◽  
Author(s):  
G. B. Andeen ◽  
P. Griffith
Keyword(s):  
Velocity Profile ◽  
Steady Flow ◽  
Momentum Flux ◽  
Two Phase Flow ◽  
Homogeneous Model ◽  
Phase Flow ◽  
Slip Model ◽  
Two Phase ◽  
Flow Models

Measurements of the momentum flux through a section of pipe with steam-water and air-water two-phase flow are reported. The results are used to evaluate the utility of various two-phase flow models and the underlying assumptions. The slip model was found to yield low values. The homogeneous model correlated the data well, but this is because of compensating errors in the assumptions. The steady flow assumption of most two-phase flow models is considered to be inadequate for prediction of the momentum flux at low quality. At higher quality the velocity profile is the dominant consideration.

Sudden Contraction Losses in Two-Phase Flow

1966 ◽  
Vol 88 (1) ◽  
pp. 1-8 ◽  
Author(s):  
G. E. Geiger ◽  
W. M. Rohrer
Keyword(s):  
Mass Velocity ◽  
Two Phase Flow ◽  
Homogeneous Model ◽  
Area Ratio ◽  
Phase Flow ◽  
Two Phase ◽  
Pressure Drops ◽  
Flow Models ◽  
System Pressure ◽  
Sudden Contraction

The experimentally determined pressure drops due to a sudden contraction in two-phase flow in round pipes is given as a function of system pressure, flowing mixture quality, contraction area ratio, and mass velocity. The theoretical equation derived for the resulting pressure drop is ΔPc=G322gcρ¯[1−σ2+K¯TPC] where KTPC is a parameter independent of mass velocity. This parameter was evaluated for three different two-phase flow models. It is shown that the fog-flow (homogeneous) model gives the best correlation of data over the whole range of conditions studied. The range of pressures studied was 200–500 psia; the area ratios varied from 0.144 to 0.398; the mass velocity varied from 0.52 × 106 to 4.82 × 106 lb/hr-ft2. The fluid used in this study was water.

scholarly journals Port-Hamiltonian formulation of two-phase flow models

2021 ◽  
Vol 149 ◽  
pp. 104881
Author(s):  
H. Bansal ◽  
P. Schulze ◽  
M.H. Abbasi ◽  
H. Zwart ◽  
L. Iapichino ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Hamiltonian Formulation ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Models

Homogeneous two-phase flow models and accurate steam-water table look-up method for fast transient simulations

2017 ◽  
Vol 95 ◽  
pp. 199-219 ◽  
Author(s):  
M. De Lorenzo ◽  
Ph. Lafon ◽  
M. Di Matteo ◽  
M. Pelanti ◽  
J.-M. Seynhaeve ◽  
...  
Keyword(s):  
Water Table ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Models ◽  
Transient Simulations ◽  
Fast Transient

Steady one-dimensional nozzle flow solutions of liquid–gas mixtures

2013 ◽  
Vol 737 ◽  
pp. 146-175 ◽  
Author(s):  
S. LeMartelot ◽  
R. Saurel ◽  
O. Le Métayer
Keyword(s):  
Two Phase Flow ◽  
Gas Mixtures ◽  
Ideal Gas ◽  
Nozzle Flow ◽  
Pure Liquid ◽  
Phase Flow ◽  
Two Phase ◽  
One Dimensional ◽  
Flow Models ◽  
Relaxation Effects

AbstractExact compressible one-dimensional nozzle flow solutions at steady state are determined in various limit situations of two-phase liquid–gas mixtures. First, the exact solution for a pure liquid nozzle flow is determined in the context of fluids governed by the compressible Euler equations and the ‘stiffened gas’ equation of state. It is an extension of the well-known ideal-gas steady nozzle flow solution. Various two-phase flow models are then addressed, all corresponding to limit situations of partial equilibrium among the phases. The first limit situation corresponds to the two-phase flow model of Kapila et al. (Phys. Fluids, vol. 13, 2001, pp. 3002–3024), where both phases evolve in mechanical equilibrium only. This model contains two entropies, two temperatures and non-conventional shock relations. The second one corresponds to a two-phase model where the phases evolve in both mechanical and thermal equilibrium. The last one corresponds to a model describing a liquid–vapour mixture in thermodynamic equilibrium. They all correspond to two-phase mixtures where the various relaxation effects are either stiff or absent. In all instances, the various flow regimes (subsonic, subsonic–supersonic, and supersonic with shock) are unambiguously determined, as well as various nozzle solution profiles.

INVESTIGATION ON VOID FRACTION FOR TWO-PHASE FLOW PRESSURE DROP OF EVAPORATIVE R-290 IN HORIZONTAL TUBE

2016 ◽  
Vol 78 (8-4) ◽  
Author(s):  
Agus Sunjarianto Pamitran ◽  
Sentot Novianto ◽  
Normah Mohd-Ghazali ◽  
Nasruddin Nasruddin ◽  
Raldi Koestoer
Keyword(s):  
Pressure Drop ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Flow Boiling ◽  
Homogeneous Model ◽  
Saturation Temperature ◽  
Horizontal Tube ◽  
Phase Flow ◽  
Two Phase ◽  
Experimental Conditions

Two-phase flow boiling pressure drop experiment was conducted to observe its characteristics and to develop a new correlation of void fraction based on the separated model. Investigation is completed on the natural refrigerant R-290 (propane) in a horizontal circular tube with a 7.6 mm inner diameter under experimental conditions of 3.7 to 9.6 °C saturation temperature, 10 to 25 kW/m2 heat flux, and 185 to 445 kg/m2s mass flux. The present experimental data was used to obtain the calculated void fraction which then was compared to the predicted void fraction with 31 existing correlations. A new void fraction correlation for predicting two-phase flow boiling pressure drop, as a function of Reynolds numbers, was proposed. The measured pressure drop was compared to the predicted pressure drop with some existing pressure drop models that use the newly developed void fraction model. The homogeneous model of void fraction showed the best prediction with 2% deviation

Momentum Flux in Two-Phase Flow

1969 ◽  
Vol 91 (3) ◽  
pp. 454-455 ◽  
Author(s):  
C. A. Prins
Keyword(s):  
Momentum Flux ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase
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