1
|
Zheng M, Fan Y, Li X, Lester D, Chen X, Li Y, Cole I. Aerosol exchange between pressure-equilibrium rooms induced by door motion and human movement. BUILDING AND ENVIRONMENT 2023; 241:110486. [PMID: 37287526 PMCID: PMC10232724 DOI: 10.1016/j.buildenv.2023.110486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 05/11/2023] [Accepted: 05/30/2023] [Indexed: 06/09/2023]
Abstract
It is now widely recognised that aerosol transport is major vector for transmission of diseases such as COVID-19, and quantification of aerosol transport in the built environment is critical to risk analysis and management. Understanding the effects of door motion and human movement on the dispersion of virus-laden aerosols under pressure-equilibrium conditions is of great significance to the evaluation of infection risks and development of mitigation strategies. This study uses novel numerical simulation techniques to quantify the impact of these motions upon aerosol transport and provides valuable insights into the wake dynamics of swinging doors and human movement. The results show that the wake flow of an opening swinging door delays aerosol escape, while that of a person walking out entrains aerosol out of the room. Aerosol escape caused by door motion mainly happens during the closing sequence which pushes the aerosols out. Parametric studies show that while an increased door swinging speed or human movement speed can enhance air exchange across the doorway, the cumulative aerosol exchange across the doorway is not clearly affected by the speeds.
Collapse
Affiliation(s)
- Minfeng Zheng
- Fujian Eco-materials Engineering Research Center, Fujian University of Technology, Fuzhou, 350118, PR China
- College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, 350118, PR China
| | - Yaming Fan
- Fujian Eco-materials Engineering Research Center, Fujian University of Technology, Fuzhou, 350118, PR China
- College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, 350118, PR China
| | - Xiangdong Li
- School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia
| | - Daniel Lester
- School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia
| | - Xin Chen
- College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350108, PR China
| | - Yiyu Li
- Fujian Eco-materials Engineering Research Center, Fujian University of Technology, Fuzhou, 350118, PR China
- College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, 350118, PR China
| | - Ivan Cole
- School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia
| |
Collapse
|
2
|
Dodds D, Sarhan AAR, Naser J. CFD Investigation into the Effects of Surrounding Particle Location on the Drag Coefficient. FLUIDS 2022; 7:331. [DOI: 10.3390/fluids7100331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
In the simulation of dilute gas-solid flows such as those seen in many industrial applications, the Lagrangian Particle Tracking method is used to track packets of individual particles through a converged fluid field. In the tracking of these particles, the most dominant forces acting upon the particles are those of gravity and drag. In order to accurately predict particle motion, the determination of the aforementioned forces become of the upmost importance, and hence an improved drag force formula was developed to incorporate the effects of particle concentration and particle Reynolds number. The present CFD study examines the individual effects of particles located both perpendicular and parallel to the flow direction, as well as the effect of a particle entrain within an infinite matrix of evenly distributed particles. Results show that neighbouring particles perpendicular to the flow (Model 2) have an effect of increasing the drag force at close separation distances, but this becomes negligible between 5–10 particle diameters depending on particle Reynolds number (Rep). When entrained in an infinite line of particles co-aligned with the flow (Model 1), the drag force is remarkably reduced at close separation distances and increases as the distance increases. The results of the infinite matrix of particles (Model 3) show that, although not apparent in the individual model, the effect of side particles is experienced many particle diameters downstream.
Collapse
|
3
|
Lin KC, Liao CC. Avoidance of Particle Accumulation in a Coating Diffuser during Dilute-Phase Pneumatic Conveying: A Case Study through Computational Fluid Dynamics. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c03174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kuang C. Lin
- Department of Engineering and System Science, Institute of Nuclear Engineering and Science, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
| | - Chuan-Chieh Liao
- Department of Mechanical Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan, ROC
| |
Collapse
|
4
|
Numerical study on the pipe flow characteristics of the cemented paste backfill slurry considering hydration effects. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2018.11.070] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
5
|
|
6
|
Shang Z. A new centrifugal correction drag force model for gas solid-particle two-phase flow. POWDER TECHNOL 2016. [DOI: 10.1016/j.powtec.2016.09.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
7
|
|