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05 Nuclear fuels (economics, policy, supplies, forecasts) 03/02270 Time-dependent neutron transport in a semiinfinite random medium
The time-dependent neutron transport in a semi-infinite random medium of binary Markovian mixture with linear anisotropic scattering is proposed. A formalism, developed to treat radiative transfer in statistical mixtures, is used to obtain the ensemble-averaged solution. The average reflectivity, radiant energy and net flux are computed for the specular-reflecting boundary. Results are obtained for isotropic and anisotropic scattering. 03/02271 Two-group interfacial area transport in vertical air-water flow I. Mechanistic model Fu. X. Y. and lshii. M. Nuclrur Enginwriq und Design. 2003. 219, (2), 143 16X.
The prediction of the dynamical evolution of interfacial area concentration is one of the most challenging tasks in two-fluid model application. This paper is focused on developing theoretical models for interfacial area source and sink terms for a two-group interfacial area transport equation. Mechanistic models of major fluid particle interaction phenomena involving two bubble groups are proposed, including the shearing-off of small bubbles from slug/cap bubbles, the wake entrainment of spherical/distorted bubble group into slug/cap hubblc group, the wake acceleration and coalescence between slug/cap bubbles. and the breakup of slug/cap bubbles due to turbulent eddy impacts. The existing one-group interaction terms are extended in considering the generation of cap bubbles, as well as different parametric dependences when these terms are applied to the slug flow regime. The complete set of modeling equations is closed and continuously covers the bubbly flow, slug flow, and churn-turbulent flow regimes. Prediction of the interfacial area concentration evolution using a one-dimensional two-group transport equation and evaluation with experimental results are described in a companion paper.
03/02272 Two-group interfacial area transport in vertical air-water flow II. Model evaluation
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