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首页> 外文期刊>International Journal of Heat and Mass Transfer >Non-thermal equilibrium melting of granular packed bed in horizontal forced convection. Part Ⅱ: numerical simulation
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Non-thermal equilibrium melting of granular packed bed in horizontal forced convection. Part Ⅱ: numerical simulation

机译：水平强制对流中粒状填充床的非热平衡熔融。第二部分：数值模拟

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摘要

A mathematic model based on the theory of interacting continua is developed to describe the complex liquid solid two-phase flow with phase-change particles as encountered in non-thermal equilibrium melting of granular packed bed subject to horizontal, forced convection. The model is solved numerically using the SIMPLE method, in which the pressure correction based on two-phase mixture continuity equation is implemented. Conservation equations are solved in the entire computational domain including both the liquid-solid region and liquid-only region. It is ensured that the global mass, momentum, and energy of two phases are conserved. The local volume-averaged solid velocity and solid volume fractions are predicted as variables so that the moving and repacking of solid particles can be simulated. This is a step forward from the results published in the open literature where the assumptions of zero-relative motion of solid particles and constant porosity or the constant volume are often used. In addition, the model provides the detailed information about the motion of two phases and phase-change characteristics. Within the uncertainty, the simulation results agree reasonably with the available experimental data presented in Part Ⅰ of this study.
机译：建立了基于相互作用连续性理论的数学模型，以描述在水平强制对流的粒状填充床非热平衡熔融过程中遇到的具有相变粒子的复杂液固两相流。使用SIMPLE方法对模型进行数值求解，其中实现了基于两相混合连续性方程的压力校正。在整个计算域中求解守恒方程，包括液固区和纯液区。确保两个阶段的整体质量，动量和能量得到保留。预测局部体积平均的固体速度和固体体积分数作为变量，以便可以模拟固体颗粒的移动和重新堆积。这是从公开文献中发表的结果迈出的一步，在公开文献中，经常使用固体颗粒的零相对运动和恒定孔隙率或恒定体积的假设。此外，该模型还提供有关两相运动和相变特性的详细信息。在不确定性范围内，仿真结果与本研究第一部分中提供的可用实验数据合理地吻合。

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