A numerical study of particle deposition in ribbed duct flow with different rib shapes

被引：46

作者：

Lu, Hao ^{[1
]}

Lu, Lin ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Dept Bldg Serv Engn, Kowloon, Hong Kong, Peoples R China

来源：

BUILDING AND ENVIRONMENT | 2015年 / 94卷

关键词：

Particle deposition; Surface ribs; Deposition enhancement; Rib shape; CFD; VENTILATION DUCT; HEAT-TRANSFER; AEROSOL DEPOSITION; TURBULENCE MODELS; CHANNEL FLOW; AIR-FLOW; SIMULATION; RESUSPENSION; PENETRATION; DISPERSION;

D O I：

10.1016/j.buildenv.2015.07.030

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The effects of surface rib shapes on particle deposition in turbulent duct air flows were numerically studied based on the Reynolds stresses model (RSM) with UDF code correction and the discrete particle model (DPM). The shapes of the rib cross sections were square, triangular and circular. The ratios of rib height to duct diameter e/D were 0.1. The present air velocity distributions for both smooth and ribbed ducts as well as particle deposition velocity in a smooth duct are all in good agreement with previous related study data. An efficiency ratio has been defined to evaluate the particle deposition enhancement ratio together with the increase of flow drag. It is found that the square ribs have the maximum enhancement efficiency on particle deposition, compared with the other rib shapes. The maximum efficiency ratio can reach about 400 for small particles (tau(+)(p) < 1) but only about 2 for large particles (tau(+)(p) > 1) when the rib shape is square. Moreover, the mechanisms of particle deposition enhancement for different rib shapes were investigated and analyzed. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：43 / 53

页数：11

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