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Filtration performance of glass fibrous air filter media under sinusoidal flow condition

机译：正弦流动条件下玻璃纤维空气过滤介质的过滤性能

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摘要

Air filter is one of the key equipments for sustainable built environment. However, the variation of incoming air velocity is usually neglected in previous studies. Therefore, we applied computational fluid dynamics techniques at micro-scale to study the filtration performance of a glass fibrous media under sinusoidal flow condition. The effects of different flow rates, fluctuation frequencies, fluctuation amplitudes and particle sizes on filtration performance were investigated. Results show that changing the incoming flow field can weaken the Brownian diffusion of particles, resulting in reduced capture efficiency for particles smaller than 0.1 mu m. The ratio of particle penetration between sinusoidal flow condition and constant flow condition is calculated. When the fluctuating frequency of the airflow changes for particles less than 0.1 mu m, the smaller the particle size is, the larger the ratio of particle penetration is. When the particle size is near the Most Penetrating Particle Size (MPPS), the fluctuating airflow with large amplitude makes the particles more easily trapped by the fiber. The fluctuating airflow with large amplitude will result in a significant reduction in the capture efficiency for particles larger than 1 mu m, and the penetration ratio will be greater than that under constant flow condition by three times. For particles with size smaller than 0.1 mu m and larger than 1 mu m, the amplitude of 0.4 (u) over bar and smaller has little effect on the capture efficiency. The capture efficiency of particles with size near MPPS value is less susceptible to changes in sinusoidal gas velocity with small amplitude.
机译：空气过滤器是可持续建筑环境的关键设备之一。然而，在以前的研究中通常会忽略进入空气速度的变化。因此，我们在微尺度上应用计算流体动力学技术，以研究正弦流动条件下玻璃纤维介质的过滤性能。研究了不同流速，波动频率，波动幅度和粒径对过滤性能的影响。结果表明，改变进入的流场可以削弱颗粒的棕色扩散，导致小于0.1μm的颗粒的捕获效率降低。计算正弦流动条件和恒定流动条件之间的颗粒穿透比率。当气流的波动频率变化小于0.1μm的颗粒时，粒径越小，粒径较大的颗粒渗透率。当粒径靠近最渗透粒度（MPPS）时，具有大振幅的波动气流使得纤维更容易被纤维捕获的颗粒。具有大振幅的波动气流将导致大于1μm的颗粒的捕获效率显着降低，并且穿透比将大于恒定流动条件下的捕获比率三次。对于小于0.1μm且大于1μm的尺寸，尺寸为0.4（U）的粒度，对捕获效率的影响几乎没有影响。具有较小MPPS值的粒子的颗粒的捕获效率不易受到具有小幅度的正弦气体速度变化的影响。

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  • 来源
    《Building and Environment》 |2020年第10期|107182.1-107182.12|共12页
  • 作者

    Zhou Bin; Xu Yang; Chen Li-Ping; Tronville Paolo; Yu Yue-Long; Chen Long;

  • 作者单位

    Nanjing Tech Univ Coll Urban Construct Dept HVAC POB 81 30 Puzhu Rd S Nanjing 211816 Peoples R China|Natl Air Cleaner & Gas Detect Prod Qual Supervis Suzhou Peoples R China;

    Nanjing Tech Univ Coll Urban Construct Dept HVAC POB 81 30 Puzhu Rd S Nanjing 211816 Peoples R China;

    Nanjing Tech Univ Coll Urban Construct Dept HVAC POB 81 30 Puzhu Rd S Nanjing 211816 Peoples R China;

    Politecn Torino Dept Energy Corso Duca Abruzzi 24 I-10129 Turin Italy;

    Nanjing Tech Univ Coll Urban Construct Dept HVAC POB 81 30 Puzhu Rd S Nanjing 211816 Peoples R China;

    Nanjing Tech Univ Coll Urban Construct Dept HVAC POB 81 30 Puzhu Rd S Nanjing 211816 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Pressure drop; Capture efficiency; Air filter; Sinusoidal flow; Particle size; Particle penetration ratio;

    机译：压降;捕获效率;空气过滤器;正弦流动;粒度;粒度渗透比;

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