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  • 1
    Electronic Resource
    Electronic Resource
    Optical properties of thin metallic film/dielectric superlattices constrained by the size effect (1994)
    Springer
    Applied physics 58 (1994), S. 535-539 
    Details
    ISSN: 1432-0630
    Keywords: 78.66.−w ; 73.61.At ; 74.20.Dm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The dispersion relation of the 1D Bloch wave vector accompanied with an incident transverse electromagnetic wave on thin metallic film/dielectric superlattices is crucial to its optical properties. The interference of excited longitudinal plasmons between neighbouring metallic films induces a collective oscillation of the whole superlattice causing coupled plasmon polariton waves. A calculation of the optical reflectance manipulated by the size effect on the dielectric constant induces more allowable bands at ω〈ωρ as the specularity parameters p and q decrease, meanwhile the cut-off frequency for band rejection also shows a blue shift.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332449
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Modelling Foamy Oil Flow in Porous Media (1999)
    Springer
    Transport in porous media 35 (1999), S. 227-258 
    Details
    ISSN: 1573-1634
    Keywords: foamy oil flow ; modelling ; nonequilibrium ; dynamic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract This paper describes a dynamic model for the simulation of foamy oil flow in porous media. The model includes expressions for the rate processes of nucleation, bubble growth and disengagement of dispersed gas bubbles from the oil. The model is used to simulate experimental results pertaining to primary depletion tests conducted in a sand pack. Using the model to interpret experimental results indicated that, although the lifetimes of supersaturation and dispersed gas bubbles may be short, supersaturated conditions are likely to exist, and dispersed gas bubbles are likely to be present during the entire production period, as long as the pressure continues to decline at a high rate. The model developed in this paper gave better agreement with experimental data than other proposed models. The effect of foamy oil flow increases as the rate of pressure decline increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006523526802
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Critical Review of Foamy Oil Flow (1999)
    Springer
    Transport in porous media 35 (1999), S. 157-187 
    Details
    ISSN: 1573-1634
    Keywords: foamy oil flow ; solution gas drive ; viscous oil ; supersaturation ; nucleation ; gas‐oil dispersion ; dispersed flow.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract ‘Foamy oil flow’ is a term coined to describe a form of two‐phase oil‐gas flow that appears to occur during solution gas drive in some heavy oil reservoirs and does not fit the classical models of two‐phase flow. Most of the evidence supporting the presence of this unusual flow mechanism is circumstantial and comes from attempts to explain much higher than expected well productivity and primary recovery factors in several heavy oil reservoirs. This paper is a review of the available literature on foamy oil flow in primary production of heavy oils under solution gas drive. The mechanisms operating in solution gas drive in heavy oil reservoirs are briefly discussed. The issues related to supersaturation in oil phase, bubble nucleation, critical gas saturation, and relative permeability are discussed. The possible role of rate processes related to the release of solution gas and the formation of a segregated gas phase is reviewed. The pore‐scale mechanisms involved in creation and propagation of dispersed gas flow are discussed. Several published mathematical models of foamy solution gas drive are reviewed with focus on their limitations. The review shows that the theoretical and experimental investigations of foamy oil flow are still in early stages. Although the occurrence of foamy oil flow has been verified in laboratory experiments, its existence at the reservoir scale has not been confirmed. The theoretical understanding of the mechanisms underlying foamy oil flow remains poor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006575510872
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    Paper (German National Licenses)
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