重金帮忙下篇文章！！！！APressureIterationSchemeforTwo-PhaseModeling.TechnicalReportLA-UR79-975,LosAlamosScientificLaboratory,LosAlamos,NewMexico,1979.谁能下到的话我可以再多给点金币下到后麻烦发

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重金帮忙下篇文章！！！！A Pressure Iteration Scheme for Two-Phase Modeling. Technical Report LA-UR 79-975, Los Alamos Scientific Laboratory, Los Alamos, New Mexico, 1979. 谁能下到的话 我可以再多给点金币 下到后麻烦发我邮箱：[e-mail]

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Abstract - This work presents a model to predict the behavior of velocity, gas holdup and local concentration fields in a pseudo-two-phase gas-liquid column reactor applied for thermal hydrocracking of petroleum heavy fractions. The model is based on the momentum and mass balances for the system, using an Eulerian-Eulerian approach. Using the k-e model,fluid dynamics accounts for both laminar and turbulent flows, with discrete small bubbles (hydrogen) flowing in a continuous pseudohomogeneous liquid phase (oil and catalyst particles). The petroleum is assumed to be a mixture of pseudocomponents, grouped by similar chemical structural properties, and the thermal hydrocracking is taken into account using a kinetic network based on these pseudocomponents. Keywords: slurry bubble column, reactor, hydrocracking, heavy oil, modeling. INTRODUCTION Three-phase and two-phase flow column reactors have many applications in industry. One of them is in the hydrocracking process, where large molecules of petroleum in the presence of excess hydrogen are broken into smaller molecules. In this process there is an increase in the amount of valuable oil subproducts, which is of great economic importance. The modeling and simulation of such reactors are quite complex, since they need to take into account both the fluid dynamics and the reactions that occur. There are a number of works in the literature about the modeling of these reactors (Celik and Wang, 1994; Chen et al, 1995; Gasche et al, 1990; Grienberger and Hofmann, 1992; Hillmer et al, 1994; Torvik and Svendsen, 1990), but they are usually applied to a different set of reactions. The present work presents a model that considers these features, specifically applied to the hydrocracking of oils, using some reasonable approximations in order to solve the problem numerically. The oil, which is a complex mixture of many compounds, is assumed to be a mixture of a small number of pseudocomponents, so that the reaction network is based on these pseudocomponents. A good mixture and uniform distribution of temperature is achieved with this equipment. Therefore, in this work the reactor is considered an isothermal system, where thermal hydrocracking reactions occur, with excess hydrogen (gas phase) flowing upward concurrently with the heavy oil (liquid phase) and the catalyst particles (solid phase). The hydrocracking modeled in this work is assumed to be thermal. The catalyst is only used to promote other kind of reactions, such as the removal of heteroatoms. However, the presence of the catalyst does affect the fluid dynamics. Considering that the catalyst particles are very small and have a small terminal velocity, in this work the slurry (oil + solid catalyst) was assumed to be a pseudo-homogeneous liquid phase.