...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Computational Physics >Validation of a lattice Boltzmann model for gas-solid reactions with experiments
【24h】

Validation of a lattice Boltzmann model for gas-solid reactions with experiments

机译：用实验验证气固反应的格子玻尔兹曼模型

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A lattice Boltzmann method is used to model gas-solid reactions where the composition of both the gas and solid phase changes with time, while the boundary between phases remains fixed. The flow of the bulk gas phase is treated using a multiple relaxation time MRT D3Q19 model; the dilute reactant is treated as a passive scalar using a single relaxation time BGK D3Q7 model with distinct inter- and intraparticle diffusivities. A first-order reaction is incorporated by modifying the method of Sullivan et al. [13] to include the conversion of a solid reactant. The detailed computational model is able to capture the multiscale physics encountered in reactor systems. Specifically, the model reproduced steady state analytical solutions for the reaction of a porous catalyst sphere (pore scale) and empirical solutions for mass transfer to the surface of a sphere at Re=10 (particle scale). Excellent quantitative agreement between the model and experiments for the transient reduction of a single, porous sphere of Fe _2O _3 to Fe _3O _4 in CO at 1023K and 10 ~5Pa is demonstrated. Model solutions for the reduction of a packed bed of Fe _2O _3 (reactor scale) at identical conditions approached those of experiments after 25 s, but required prohibitively long processor times. The presented lattice Boltzmann model resolved successfully mass transport at the pore, particle and reactor scales and highlights the relevance of LB methods for modelling convection, diffusion and reaction physics.
机译：格子Boltzmann方法用于模拟气固反应，其中气相和固相的组成均随时间变化，而相之间的边界保持固定。使用多重弛豫时间MRT D3Q19模型处理本体气相的流;使用具有不同粒子间和粒子内扩散率的单个弛豫时间BGK D3Q7模型，将稀释的反应物视为被动标量。通过修改Sullivan等人的方法，引入一级反应。 [13]包括固体反应物的转化。详细的计算模型能够捕获反应堆系统中遇到的多尺度物理学。具体地，该模型再现了用于多孔催化剂球的反应的稳态分析解（孔径）和用于将质量转移到Re = 10（颗粒级）的球表面的经验解。实验证明，在1023K和10〜5Pa下，CO中的单个多孔球Fe _2O _3瞬时还原为Fe _3O _4时，该模型与实验之间具有良好的定量一致性。在相同条件下还原Fe _2O _3（反应器规模）填充床的模型解决方案在25 s后达到了实验的解决方案，但是需要非常长的处理时间。提出的格子玻尔兹曼模型成功地解决了在孔，颗粒和反应器尺度上的传质问题，并强调了LB方法对流，扩散和反应物理建模的相关性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号