Study on the effect of applying water on improving air quality of subway systems by reducing the generation of the airborne wear particles from the wheel-rail contact

Lee HyunWook

doi:https://doi.org/10.15250/joie.2022.21.2.121

Study on the effect of applying water on improving air quality of subway systems by reducing the generation of the airborne wear particles from the wheel-rail contact

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휠-레일 접촉 미세마모 입자 발생 감소를 통한 살수 방법의 지하철 시스템 공기 질 향상 효과 연구

Type: Academic journal

Author: Lee HyunWook (한국철도기술연구원)

Journal: Korean Society of ODOR Reseach and Engineering 실내환경 및 냄새 학회지 실내환경 및 냄새 학회지 제21권 제2호 KCI Accredited Journals

Published: 2022.6

Pages: 121 - 130 (10page)

DOI: https://doi.org/10.15250/joie.2022.21.2.121

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Study on the effect of applying water on improving air quality of subway systems by reducing the generation of the airborne wear particles from the wheel-rail contact

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2022

Study on the effect of applying water on improving air quality of subway systems by reducing the generation of the airborne wear particles from the wheel-rail contact

Lee HyunWook 실내환경 및 냄새 학회지 2022.06 Academic journal

2021

Study on the Reduction of Nanoparticles Generated from the Wheel-rail Contact for Improving Air Quality in the Subway Systems

H. W. Lee 한국정밀공학회 학술발표대회 논문집 2021.11 Proceeding

2019

Generation Trend of Nano-paticles Emitted from the Wheel/Rail Contact

H. Lee 한국정밀공학회 학술발표대회 논문집 2019.10 Proceeding

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Although airborne wear particles (AWPs) generated from wheel-rail contacts are the major source of particulate matter (PM) in subway systems, studies on reducing the generation of such particles in order to enhance air quality are extremely rare. Therefore, this study investigated the effect of applying water-lubricant (applying tap water) on improving air quality by reducing the mass concentration (MC) of AWPs from wheel-rail contacts at a train velocity of 73 km/h using a twin-disk rig. An optical particle sizer was used to measure the MC of particles with the diameter range of 0.3 μm~10 μm. The results showed that the generation trends regarding PM1, PM2.5, and PM10 were different for dry and water-lubricated conditions: all three PMs showed an increasing-decreasing trend with slip rate under dry conditions; however, they were almost constant with slip rate under water-lubricated conditions. The particle size distributions were also different for dry and water-lubricated condi tions: the peak occurred in multi-modal with the largest peak at approximately 6 μm in diameter under dry conditions; whereas, the peak occurred in bi-modal with the largest peak at approximately 0.9 μm in diameter under water-lubricated conditions. In addition, MCs were mostly smaller under water-lubricated conditions than dry conditions except at approximately 0.9 μm in diameter. Applying water significantly decreased PM1~2.5 and PM2.5~10 by more than 95%. This caused a decrease in PM2.5 and PM10 by 48.1% and 78.5%, respectively. On the other hand, applying water increased PM0.3~1 (i.e., PM1) by 52.8%, possi bly owing to the effect of water vapor and mineral crystals from tap water. Overall, these findings indicate that water-lubrication can improve air quality in subway systems by reducing the MC of APWs generated from wheel-rail contacts. This study may provide a reference for future studies seeking to improve air quality in subway systems by reducing AWPs gen erated from wheel-rail contacts by applying lubricants.

#. #Airborne wear particle #Air quality #Twin-disk rig #Water-lubricant #Wheel-rail contact

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Affiliation 한국철도기술연구원

Fields Engineering > Architectural Engineering > Environmental Engineering

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