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首页> 外文期刊>International Journal of Heat and Mass Transfer >A mesoscopic model for transient mass transfer of volatile organic compounds from porous walls of different structures
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A mesoscopic model for transient mass transfer of volatile organic compounds from porous walls of different structures

机译：介观模型从不同结构的多孔壁中瞬时转移挥发性有机化合物

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摘要

Transient mass diffusion and convection of volatile organic compounds (VOCs) from walls is an important issue for air quality in buildings. In the present work, a new model of these processes that captures mass transport within the wall structure is presented and applied for a ventilated enclosure. Porous wall structures composed of two solid phases (one carrying the VOC and one inert) and one fluid phase air are generated by the Controllable Structure Generation Scheme (CSGS) based on discrete Gaussian quadrature space and velocity. Mesoscopic scale parallel non-dimensional lattice Boltzmann method (P-NDLBM) simulations are performed for relevant ranges of wall porosity, Reynolds and Schmidt numbers for a two-dimensional enclosure with a top inlet and bottom outlets. The effect of the wall structure on mass transfer in the enclosure is investigated for two wall structures: type (A) a wall with randomly immersed particles, and type (B) a shape-separated wall structure. Results include transient VOC concentration and streamlines in the porous wall and the enclosure for a vary of porosities and diffusivities for each phase. The pore structure and porosity of the wall have significant impact on mass transfer. Type (B) structures are more favorable for rapid mass transfer within the wall.
机译：挥发性有机化合物（VOC）从墙壁的瞬态质量扩散和对流是建筑物空气质量的重要问题。在目前的工作中，提出了一种捕获壁结构内质量传递的新方法，并将其应用于通风罩。基于离散高斯正交空间和速度，通过可控结构生成方案（CSGS）生成了由两个固相（一个载有VOC和一个惰性气体）和一个液相空气组成的多孔壁结构。对于具有顶部入口和底部出口的二维外壳，对壁孔的相关范围，雷诺数和施密特数进行了介观尺度的平行无量纲格子Boltzmann方法（P-NDLBM）模拟。对于两种壁结构，研究了壁结构对外壳中传质的影响：（A）型是随机浸入颗粒的墙，（B）型是分离的墙结构。结果包括瞬态VOC浓度和多孔壁和外壳中的流线型变化，每个相的孔隙率和扩散率均发生变化。壁的孔结构和孔隙度对传质有重要影响。 （B）型结构更有利于壁内的快速传质。

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