분진 유동 정화를 위한 다공매질체 주위 유동 해석

Particulate flow and related mitigation measures have been of recent public interest because of increased occurrence of yellow dust and potential threat of volcanic ash around Korea. This paper presents computational method to analyze the flow around or through apparatus using porous media to purify particulate airflow. In general, computational modeling for porous media is very difficult task due to complexity and geometrical scale incurred by tiny pores in the filtering mechanism. Most of computational approach to deal with flow in the porous media employ many forms of empirical methods to model the flow resistance inside the porous zone; however, some of empirical coefficients used in the methods are not always easy to determine. In this paper, computational models for actual porous media as well as empirical methods are presented in order to quantifying the relevant coefficients and the results are compared with experimental measurement carried out for perforated plate. Both 2D and 3D porous zone are analyzed, showing that empirical methods using known pressure loss and Ergun equation are capable of assessing pressure drop in the flow through the porous zone, except for Ergun equation’s application to 2D flow. The present results suggest that the mitigation devices to particulate flow such as volcanic ash can be analyzed and developed using computational fluid dynamics.