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  1. Modeling and application of transport phenomena in porous media - article pay-per-view - 25€ / article

    Modeling and application of transport phenomena in porous media - article pay-per-view - 25€ / article

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    Transport phenomena in porous media are very important in a wide range of applications including chemical and nuclear indus­tries, oil recovery, civil engineering and energy related pro­blems. The objectives of this lecture series was to present a methodology for developing well posed mathematical models of transport in porous media and to give examples of recent advances in modeling transport phenomena of special interest. In the first session, modeling based on a continuum approach involving multiple extensive quantities and multiple media was introduced. Representative elementary volume and averaging definitions lead to the derivation of microscopic balance equa­tions. The following session was devoted to the provision of information on the structural features of porous media. Stochastic descriptions of the properties of porous media, homogeneity and heterogeneity were presented. Simulation of the random structure of porous media was discussed. Succeeding lectures showed how the understanding of phenomena at pore level permits the derivation of the general macroscopic balance equations of mass, momentum and energy in porous media. Emphasis was placed on the complete model with discussion of the problem of initial and boundary conditions. Several lectures were devoted to the modeling of multiphase flow in porous media; wettability, capillarity and hyneresis phenomena were considered; the relative permeability concept was introduced. The last session was assigned to the presentation of typical applications especially in connection with groundwater flow and pollution of aquifer, boiling and dryout problematics in liquid saturated self heated particulate beds, drying processes and spatial heat transport systems based on thermal capillary pumping. Learn More
  2. Particle image displacement velocimetry - article pay-per-view - 25€ / article VKI LS 1988-06

    Particle image displacement velocimetry - article pay-per-view - 25€ / article VKI LS 1988-06

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    This lecture series was the first organized series of courses relevant to Particle Image Displacement Velocimetry (also sometimes called Speckle Velocimetry). This technique recently has aroused considerable interest and a continuously increasing number of research laboratories are presently considering the development and application of this new technique. It was therefore necessary to allow interested scientists to have a first synthetic view of the state-of-the-art of this novel technique which allows the measurement of a full velocity field in a plane at a single instant. The first part of the lecture series presentation was devoted to a presentation of the fundamentals of PIDV. This allowed newcomers to have a comprehensive view of the basics of this powerful measurement technique. In the second part, the lectures dealt with more specific topics such as scattering of light by small particles, photographic parameters and description of practical systems. The different processing techniques proposed in the literature were reviewed and discussed. Finally, the more advanced methods allowing the determination of flow direction, field density and the measurement of three components of velocity were presented together with novel optical processing methods relying on the latest electro-optical techniques. The third part of this event was devoted to the presentation of selected papers by attendees to the lecture series. This allowed a broadening of the scope of this course and a better view of the latest advances accomplished in this field. Learn More
  3. Introduction to computational fluid dynamics - article pay-per-view - 25€ / article VKI LS 1988-02
  4. Particulate flow and blade erosion - article pay-per-view - 25€ / article

    Particulate flow and blade erosion - article pay-per-view - 25€ / article

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    Solid particle erosion problems are of great concern in gas turbines, steam turbines, boilers, fluidized beds, aircraft engines and many other systems. Erosion may cause a significant decrease in the operating lifetime of gas turbine engines or other systems operating in dusty environments or when ash particles are present, as in coal gasification. Particle trajectory studies provide information on particle impact and location, and erosion studies indicate the amount of material removed with each particle impact. The course presented the principles involved and the state-of-the-art in erosion prediction for engines subjected to solid particle ingestion. Particle deposition may have as detrimental an effect on turbine performance as blade erosion. The mechanism of particle formation and particle adhesion to the blade surfaces were discussed in depth with particular emphasis on fluidized bed and coal-fired turbine applications. Learn More
  5. Transonic compressors - article pay-per-view - 25€ / article

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