On the theory of two-phase zone incipience due to the effect of constitutional supercooling

2018 ◽  
Author(s):  
D. V. Alexandrov ◽  
I. V. Alexandrova ◽  
A. A. Ivanov ◽  
O. V. Gusakova ◽  
L. V. Toropova ◽  
...  
Keyword(s):  
Constitutional Supercooling ◽  
Phase Zone ◽  
Two Phase

Gas-Water Flow Behaviour During Mutual Displacement in Porous Media

2017 ◽  
Vol 10 (1) ◽  
pp. 13-22
Author(s):  
Renyi Cao ◽  
Junjie Xu ◽  
Xiaoping Yang ◽  
Renkai Jiang ◽  
Changchao Chen
Keyword(s):  
Porous Media ◽  
Relative Permeability ◽  
Gas Storage ◽  
Fluid Distribution ◽  
Water Displacement ◽  
Phase Zone ◽  
Two Phase ◽  
Flow Process ◽  
Single Well ◽  
Mutual Displacement

During oilfield development, there exist multi-cycle gas–water mutual displacement processes. This means that a cycling process such as water driving gas–gas driving water–water driving gas is used for the operation of injection and production in a single well (such as foam huff and puff in single well or water-bearing gas storage). In this paper, by using core- and micro-pore scales model, we study the distribution of gas and water and the flow process of gas-water mutual displacement. We find that gas and water are easier to disperse in the porous media and do not flow in continuous gas and water phases. The Jamin effect of the gas or bubble becomes more severe and makes the flow mechanism of multi-cycle gas–water displacement different from the conventional water driving gas or gas driving water processes. Based on experiments of gas–water mutual displacement, the changing mechanism of gas–water displacement is determined. The results indicate that (1) after gas–water mutual displacement, the residual gas saturation of a gas–water coexistence zone becomes larger and the two-phase zone becomes narrower, (2) increasing the number of injection and production cycles causes the relative permeability of gas to increase and relative permeability for water to decrease, (3) it becomes easier for gas to intrude and the invaded water becomes more difficult to drive out and (4) the microcosmic fluid distribution of each stage have a great difference, which caused the two-phase region becomes narrower and effective volume of gas storage becomes narrower.

Heat Transfer in Porous Media Heated From Above With Evaporation, Condensation, and Capillary Effects

1983 ◽  
Vol 105 (3) ◽  
pp. 485-492 ◽  
Author(s):  
K. S. Udell
Keyword(s):  
Stable State ◽  
Superheated Liquid ◽  
Phase Zone ◽  
Two Phase ◽  
Water Steam ◽  
Zone Length ◽  
Compressed Liquid ◽  
Pressure Lowering ◽  
Darcy’S Equations ◽  
Convection Dominated

Heat and mass transfer characteristics of a sand-water-steam system heated at the top and cooled at the bottom were studied. It was found that at steady-state conditions the system segregated into three regions. The top region was conduction-dominated with the voids containing a stationary superheated steam. The middle region was convection-dominated, nearly isothermal, and exhibited an upward flow of the liquid by capillary forces and a downward flow of steam due to a slight pressure gradient. The bottom portion contained a stationary compressed liquid and was also conduction dominated. The length of the two-phase convection zone was evaluated through the application of Darcy’s equations for two-phase flow and correlations of relative permeabilities and capillary pressure data. The model was in excellent agreement with the observed results, predicting a decreasing two-phase zone length with increasing heat flux. The thermodynamics of the two-phase zone were also analyzed. It was found that the vapor phase was in a superheated state as described by the Kelvin equation for vapor pressure lowering. Also, it was evident that the liquid must also be superheated for thermodynamic equilibrium to result. A stability analysis demonstrated that the superheated liquid can exist in an unconditionally stable state under conditions typical of porous systems. The degree of liquid superheat within the two-phase zone of these experiments was obtained.

Effect of RE on Performance of Semi-Solid AlSi7 Alloy

2010 ◽  
Vol 426-427 ◽  
pp. 581-584 ◽  
Author(s):  
Rong Xi Yi ◽  
Shi Kun Xie ◽  
Xiao Qiu Zheng ◽  
Yong Ping Ai
Keyword(s):  
Phase Zone ◽  
Two Phase ◽  
Semi Solid ◽  
Solid Liquid ◽  
Different Content ◽  
Zone Temperature

The semi-solid slurry of AlSi7 alloy was prepared by near-liquids cast processing. The effects of different content of RE on the cast performance and the semi-solid remelting performance in AlSi7 alloy was researched. The results indicated that adding RE will widen the AlSi7 alloy solid-liquid two-phase zone temperature and refine the grains, silicon will obvious metamorphoses. The best amount of RE is about 0.5%. Its semi-solid remelting organization is equilateral globular grains.

Solidification with a quasiequilibrium two-phase zone

2001 ◽  
Vol 49 (5) ◽  
pp. 759-764 ◽  
Author(s):  
D.V. Alexandrov
Keyword(s):  
Phase Zone ◽  
Two Phase

Convection in the two-phase zone of solidifying alloys

1984 ◽  
Vol 15 (1) ◽  
pp. 163-172 ◽  
Author(s):  
A. L. Maples ◽  
D. R. Poirier
Keyword(s):  
Phase Zone ◽  
Two Phase

scholarly journals Fractal Phase Distribution and Drying: Impact on Two-Phase Zone Scaling and Drying Time Scale Dependence

2012 ◽  
Vol 30 (11-12) ◽  
pp. 1129-1135 ◽  
Author(s):  
Marc Prat ◽  
Stéphanie Veran-Tissoires ◽  
Nicole Vorhauer ◽  
Thomas Metzger ◽  
Evangelos Tsotsas
Keyword(s):  
Time Scale ◽  
Phase Distribution ◽  
Scale Dependence ◽  
Phase Zone ◽  
Two Phase ◽  
Drying Time

Mathematical Simulation of Different Argon Blowing Style in Ladle Furnace

2005 ◽  
Vol 475-479 ◽  
pp. 3211-3214
Author(s):  
San Bing Ren ◽  
Jun Fei Fan ◽  
Zong Ze Huang ◽  
Yi Sheng Chen ◽  
You Duo He
Keyword(s):  
Mathematical Simulation ◽  
Stokes Equation ◽  
Molten Steel ◽  
Navier Stokes ◽  
Ladle Furnace ◽  
Phase Zone ◽  
Two Phase ◽  
Navier Stokes Equation ◽  
Flow Variables ◽  
Turbulence Parameters

In the present paper, applied the experiential correlation, the gas holdup and distribution of two phase zone which formed by argon blown were determined. The flow variables of molten steel and turbulence parameters in the Ladle Furnace were estimated utilizing the results of frontal calculation and through numerically solution momentum Navier-Stokes equation in conjunction with k-εturbulence model. Several different spray styles including blowing through single hole, double holes, top lance were simulated and compared in this project.

Rapid Crystallization of Refractory Oxides and the Possibility of Formation of a Two-Phase Zone

2003 ◽  
Vol 41 (6) ◽  
pp. 825-832 ◽  
Author(s):  
A. Yu. Vorob'ev ◽  
V. A. Petrov ◽  
V. E. Titov ◽  
S. A. Ulybin
Keyword(s):  
Phase Zone ◽  
Two Phase ◽  
Rapid Crystallization ◽  
Refractory Oxides
Sign in / Sign up

Export Citation Format

Share Document