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首页> 外文会议>International Symposium on Supercritical Fluids Tome 1: Natural Products, Process amp; Equipment Development; 20030428-20030430; Versailles; FR >REGULAR PACKING TYPES FOR CFD SIMULATION OF SCF EXTRACTION AND REACTION EQUIPMENT
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REGULAR PACKING TYPES FOR CFD SIMULATION OF SCF EXTRACTION AND REACTION EQUIPMENT

机译：SCF萃取和反应设备的CFD模拟的常规填料类型

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摘要

Fixed-bed structure study and its effects in heat and mass transfer has been widely reviewed by several authors. Determination of geometrical properties of randomly packed beds with computational simulation has conduced to the development of algorithms for simulating the construction of random packings in cylindrical containers. Regular packing of spheres has also been studied, developing uniform geometries; geometry-based models and computational algorithms have permitted to develop flow profile predictions in packed columns. Computational Fluid Dynamics (CFD) has proven to be a powerful tool to numerically solve fluid motion and transfer equations. There has been a fast growing in the study of applications in fluid flow and heat transfer, and have been used to analyse flow patterns in fixed-bed equipment and to predict heat transfer parameters in studied cases. In this work we review prior aproaches to geometrical sphere-based models for packed beds and propose three different geometrical arrangements for packed bed equipment computer simulation relevant to SCF extraction equipment design. These models are to be used in CFD simulation of supercritical extraction and reaction equipment. Fluid analyzed is taken to be CO_2 in supercritial conditions, with an uniform velocity at the bed inlet and a fixed velocity condition around the spheres and at the wall. Neither thermal nor mass transfer boundary conditions are considered.
机译：固定床结构研究及其在传热和传质中的作用已被多位作者广泛综述。通过计算仿真确定随机填充床的几何特性，有助于开发用于模拟圆柱形容器中随机填充物构造的算法。还研究了球的规则堆积，形成了均匀的几何形状。基于几何的模型和计算算法已允许开发填充柱中的流量剖面预测。实践证明，计算流体动力学（CFD）是解决数字运动和传递方程的强大工具。在流体流动和传热方面的应用研究一直在快速增长，并且已被用于分析固定床设备中的流动模式并预测所研究情况下的传热参数。在这项工作中，我们回顾了基于几何球的填充床模型的先前方法，并为与SCF提取设备设计相关的填充床设备计算机仿真提出了三种不同的几何布置。这些模型将用于超临界萃取和反应设备的CFD模拟中。在超临界条件下，被分析的流体被认为是CO_2，在床入口处具有均匀的速度，在球体和壁周围具有固定的速度条件。既不考虑传热边界条件也不考虑传质边界条件。

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