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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Stability improvement of the one-dimensional two-fluid model for horizontal two-phase flow with model unification

Abel, Kent C. 25 August 2005 (has links)
The next generation of nuclear safety analysis computer codes will require detailed modeling of two-phase fluid flow. The most complete and fundamental model used for these calculations is known as the two-fluid model. It is the most accurate of the two-phase models since it considers each phase independently and links the two phases together with six conservation equations. A major drawback is that the current two-fluid model, when area-averaged to create a one-dimensional model, becomes ill-posed as an initial value problem when the gas and liquid velocities are not equal. The importance of this research lies in obtaining a model that overcomes this difficulty. It is desired to develop a modified one-dimensional two-fluid model for horizontal flow that accounts for the pressure difference between the two phases, due to hydrostatic head, with the implementation of a void fraction distribution parameter. With proper improvement of the one-dimensional two-fluid model, the next generation of nuclear safety analysis computer codes will be able to predict, with greater precision, the key safety parameters of an accident scenario. As part of this research, an improved version of the one-dimensional two-fluid model for horizontal flows was developed. The model was developed from a theoretical point of view with the three original distribution parameters simplified down to a single parameter. The model was found to greatly enhance the numerical stability (hyperbolicity) of the solution method. With proper modeling of the phase distribution parameter, a wide range of flow regimes can be modeled. This parameter could also be used in the future to eliminate the more subjective flow regime maps that are currently implemented in today's multiphase computer codes. By incorporating the distribution parameter and eliminating the flow regime maps, a hyperbolic model is formed with smooth transitions between various flow regimes, eliminating the unphysical oscillations that may occur near transition boundaries in today's multiphase computer codes. / Graduation date:2006
32

Discontinuous Galerkin finite element methods applied to two-phase, air-water flow problems

Eslinger, Owen John 28 August 2008 (has links)
Not available / text
33

Dynamics of a single flexible cylinder in external axial compressible fluid flow

Ostoja-Starzewski, Martin January 1980 (has links)
No description available.
34

Mass transfer in two-phase annular flow

Wu, Der Chang 05 1900 (has links)
No description available.
35

Two phase swirling flow in a cylindrical reactor

Nygaard, Thor Isak. 05 1900 (has links)
No description available.
36

Analysis of separated, non-parallel, axisymmetric, annular two-phase flows

Pohner, John A. 08 1900 (has links)
No description available.
37

Moisture fraction measurement for two-phase mist flow

Wartell, Jason David 05 1900 (has links)
No description available.
38

Interphase transfer processes in cocurrent two phase channel flow

Luo, Danhui 08 1900 (has links)
No description available.
39

Hydrodynamic characteristics of countercurrent two-phase flows involving highly viscous liquids

Wu, Xuemei 08 1900 (has links)
No description available.
40

Heat transfer and flow characteristics in restricted geometries

Cooper, Patrick Emanuel 12 1900 (has links)
No description available.

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