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The influence of air inlet angle in swirl diffusers of UFAD system on distribution and deposition of indoor particles

机译：UFAD系统旋流扩散器中的空气入口角度对室内颗粒分布和沉积的影响

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摘要

The objective of the present study was to investigate the effect of swirl angle on the distribution and deposition of contaminant particles in a chamber with swirl diffuser in an under-floor air distribution (UFAD) system. In the desired model, the analysis of flow field and particle distribution for swirling diffusers at four angles 30°, 45°, 60°, and 90° has been conducted by OpenFOAM® with Eulerian-Lagrangian approach. The results show that under uniform initial distribution condition for particles, the percentage of inhalable particulate matter in the breathing zone decreases faster for the rotation angles of 45° and 60°. In other words, at the inlet angle of 45° and 60° after 600 s, the percentage of 2.5 μm particles removed is 79.2 and 79.5, respectively. While the same percentage for the inlet angle of 30° and 90° is 67.5 and 75.8, respectively. For the considered particles, the inlet angle of 45° and 60° can cause to increase the number of exited particles in comparison with the inlet angle of 30° and 90. Also, when the particles enter the chamber from inlet air diffusers, the concentration of 1, 2.5, and 5 μm particles in the breathing zone decreases by increasing the inlet air angle. But, for the 10, and 25 μm particles, the concentration of particles in the breathing zone increases by increasing the rotation angle of inlet swirl diffusers. The percentages of 2.5 μm particles exiting the outlet are 27.8, 46.9, 53.7, and 58 for the inlet angle of 30°, 45°, 60°, and 90°, respectively.
机译：本研究的目的是探讨旋流角对横向空气分布（UFAD）系统中旋流扩散器中腔室中污染物颗粒的分布和沉积的影响。在所需的模型中，通过OpenFoam®与Eulerian-Lagrangian方法进行了用于旋转扩散器的流场和颗粒分布的分析。结果表明，在颗粒的均匀初始分布条件下，呼吸区中可吸入颗粒物质的百分比可以更快地降低45°和60°的旋转角度。换句话说，在600秒后45°和60°的入口角度下，除去2.5μm颗粒的百分比分别为79.2和79.5。虽然30°和90°的入口角度相同的百分比分别为67.5和75.8。对于所考虑的颗粒，与30°和90的入口角度相比，45°和60°的入口角可以导致增加退出颗粒的数量。此外，当颗粒从入口空气扩散器进入腔室时，浓度通过增加入口空气角度，呼吸区中的1,2.5和5μm颗粒减小。但是，对于10和25μm颗粒，呼吸区中的颗粒的浓度通过增加入口涡流扩散器的旋转角度而增加。离开出口的2.5μm颗粒的百分比分别为27.8,46.9,53.7和58，分别为30°，45°，60°和90°。

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