AN ANALYSIS OF CONSTANT PRESSURE STEAM INJECTION IN AN UNSATURATED POROUS MEDIUM

1994 ◽  
Author(s):  
H.J.H. Brouwers ◽  
Shuanhu Li
Keyword(s):  
Porous Medium ◽  
Constant Pressure ◽  
Steam Injection ◽  
Unsaturated Porous Medium ◽  
Pressure Steam

scholarly journals An Experimental Study of Constant-Pressure Steam Injection and Transient Condensing Flow in an Air-Saturated Porous Medium

1996 ◽  
Vol 118 (2) ◽  
pp. 449-454 ◽  
Author(s):  
H. J. H. Brouwers
Keyword(s):  
Porous Medium ◽  
Constant Pressure ◽  
Water Saturation ◽  
Saturated Porous Medium ◽  
Steam Injection ◽  
Irreducible Water Saturation ◽  
Pressure Steam ◽  
Glass Tubes ◽  
Vertical Glass ◽  
Condensed Water

In this paper the unsteady process of constant pressure steam injection into an air–saturated porous medium is studied experimentally. To this end, vertical glass tubes are packed with dry quartz sand and injected with dry steam. The propagation of the steam front appears to be proportional to t. It is observed that the water saturation is homogeneously distributed and remains below the irreducible water saturation. Furthermore, the theoretical model of Brouwers and Li (1994) of the process is applied to the experiments and extended to take wall effects into account. A comparison of the predicted front penetration and amount of condensed water with the experimental results yields fairly good agreement.

A REMARK ON "THE PARAMETER DEPENDENCE OF THE COEFFICIENT IN A MODEL FOR CONSTANT PRESSURE STEAM INJECTION IN SOIL"

1998 ◽  
Vol 08 (08) ◽  
pp. 1317-1321 ◽  
Author(s):  
G. RUSSO
Keyword(s):  
Integral Equation ◽  
Numerical Solution ◽  
Nonlinear Optimization ◽  
Constant Pressure ◽  
Steam Injection ◽  
Parameter Dependence ◽  
Accurate Approximation ◽  
Pressure Steam

A simple and accurate approximation is obtained to the numerical solution of the integral equation presented in Ref. 1 by using nonlinear optimization.

The Parameter Dependence of the Coefficient in a Model for Constant-Pressure Steam Injection in Soil

1997 ◽  
Vol 07 (05) ◽  
pp. 593-612 ◽  
Author(s):  
Brian H. Gilding ◽  
Shuanhu Li
Keyword(s):  
Probability Distribution ◽  
Crucial Role ◽  
Constant Pressure ◽  
Steam Injection ◽  
Unknown Coefficient ◽  
Qualitative Properties ◽  
Normal Probability ◽  
Proposed Model ◽  
Pressure Steam ◽  
Normal Probability Distribution

In a recently proposed model for the injection of steam into an air-filled soil, an equation which defines an unknown coefficient in terms of the parameters in the model arises. The paper examines this equation. It is shown that the coefficient is well-defined. Furthermore, quantitative and qualitative properties of the dependence of the coefficient on the parameters in the model are derived. A crucial role in the analysis is played by the Mills ratio for the normal probability distribution. By the bye, bounds for the Mills ratio, which to the best of the authors' knowledge are new, are obtained.

Measurement of two-fluid saturations in a fine to medium sand

1996 ◽  
Vol 33 (6) ◽  
pp. 1014-1017 ◽  
Author(s):  
C F Gravelle ◽  
M A Knight ◽  
R J Mitchell
Keyword(s):  
Experimental Study ◽  
Porous Medium ◽  
Porous Media ◽  
Key Words ◽  
Oil Content ◽  
Reliable Method ◽  
Medium Sand ◽  
Unsaturated Porous Medium ◽  
Phase Liquid ◽  
Two Fluid

The infiltration of a light nonaqueous phase liquid (LNAPL) into an unsaturated porous medium will result in varying amounts of water, LNAPL, and air within the soil voids. A simple and reliable method of determining the percent saturation of each fluid is needed to analyze laboratory infiltration experiments. This note reviews the available methodologies for determining the oil content in porous media and presents an experimental study of a simple and reliable method for determining water and oil contents in an unsaturated fine to medium sand. Key words: fluid saturations, oil content, gravimetric, extraction, assay.

Effects of Steam Reheat in Advanced Steam Injected Gas Turbine Cycles

1998 ◽  
Author(s):  
A. Hofstädter ◽  
H. U. Frutschi ◽  
H. Haselbacher
Keyword(s):  
Steam Turbine ◽  
Gas Turbine ◽  
Power Plants ◽  
Steam Injection ◽  
Combined Cycle ◽  
Back Pressure ◽  
Turbine Efficiency ◽  
Pressure Steam ◽  
Additional Improvement ◽  
Gas Turbine Exhaust

Steam injection is a well-known principle for increasing gas turbine efficiency by taking advantage of the relatively high gas turbine exhaust temperatures. Unfortunately, performance is not sufficiently improved compared with alternative bottoming cycles. However, previously investigated supplements to the STIG-principle — such as sequential combustion and consideration of a back pressure steam turbine — led to a remarkable increase in efficiency. The cycle presented in this paper includes a further improvement: The steam, which exits from the back pressure steam turbine at a rather low temperature, is no longer led directly into the combustion chamber. Instead, it reenters the boiler to be further superheated. This modification yields additional improvement of the thermal efficiency due to a significant reduction of fuel consumption. Taking into account the simpler design compared with combined-cycle power plants, the described type of an advanced STIG-cycle (A-STIG) could represent an interesting alternative regarding peak and medium load power plants.

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