The goal of this study is to investigate the effects of relative humidity on particle resuspension. The experimental study on the resuspension of different size particles is performed in the laboratory at 50%, 60%, 70% and 80% relative humidity separately. The material of flooring is shaggy carpet. The experiments are carried out in a closed room with four laser dust instruments and a laser dust particle counter. The results show that when the relative humidity is 60% and 70%, the resuspension of indoor particulate matter is likely to occur. Human walking has a greater impact on larger-size particles. Under the conditions of different humidity, four situations all follow a rule that the larger the particle size is, the more stable the particle state is.
ZHENG Shuihua, DU Weiyuan, ZHAO Lipan, LI Xiangpeng
. Effect of Relative Humidity on Resuspended Particles Caused by Human Walking[J]. Journal of Shanghai Jiaotong University(Science), 2020
, 25(3)
: 365
-371
.
DOI: 10.1007/s12204-020-2176-1
[1] VAN DER GON H A C D, GERLOFS-NIJLANDM E, Gehrig R, et al. The policy relevance of wear emissions from road transport, now and in the future: An international workshop report and consensus statement [J].Journal of the Air and Waste Management Association,2013, 63(2): 136-149. [2] AMATO F, CASSEE F R, VAN DER GON H A C D, et al. Urban air quality: The challenge of traffic nonexhaust emissions [J]. Journal of Hazardous Materials,2014, 275(2): 31-36. [3] LI Y G, CHEN Z D. A balance-point method for assessing the effect of natural ventilation on indoor particle concentrations [J]. Atmospheric Environment,2003, 37(30): 4277-4285. [4] YOU S M, WAN M P. Experimental investigation and modelling of human-walking-induced particle resuspension[J]. Indoor and Built Environment, 2015,24(4): 564-576. [5] TIAN Y, SUL K, QIAN J, et al. A comparative study of walking-induced dust resuspension using a consistent test mechanism [J]. Indoor Air, 2014, 24(6): 592-603. [6] OWEN M K, ENSOR D S, SPARKS L E. Airborne particle sizes and sources found in indoor air [J]. Atmospheric Environment Part A General Topics, 1990,26(12): 2149-2162. [7] SPENGLER J D, SAMET J M, MCCARTHY J F. Indoor air quality handbook [M]. New York, USA:McGraw-Hill, 2001. [8] WANG S, ZHAO B, ZHOU B, et al. An experimental study on short-time particle resuspension from inner surfaces of straight ventilation ducts [J]. Building and Environment, 2012, 53(6): 119-127. [9] ARDEN POPE III C. Review: Epidemiological basis for particulate air pollution health standards [J].Aerosol Science and Technology, 2000, 32(1): 4-14. [10] LAI A C K, TIAN Y, TSOI J Y L, et al. Experimental study of the effect of shoes on particle resuspension from indoor flooring materials [J]. Building and Environment,2017, 118: 251-258. [11] BRANIˇS M, ˇREZ′A ˇCOV′A P, DOMASOV′AM. The effect of outdoor air and indoor human activity on mass concentrations of PM10, PM2.5, and PM1 in a classroom[J]. Environmental Research, 2005, 99(2): 143-149. [12] THATCHER T L, LAYTON D W. Deposition, resuspension,and penetration of particles within a residence[J]. Atmospheric Environment, 1995, 29(13): 1487-1497. [13] NAZAROFF W W. Indoor particle dynamics [J]. Indoor Air, 2004, 14(Sup 7): 175-183. [14] ABT E, SUH H H, ALLEN G, et al. Characterization of indoor particle sources: A study conducted in the metropolitan Boston area [J]. Environmental Health Perspectives, 2000, 108(1): 35-44. [15] YOU S M, WAN M P. A new turbulent-burst based resuspension model with humidity effect [C]//10th International Conference on Healthy Buildings. Brisbane,Australia: International Society of Indoor Air Quality and Climate (ISIAQ), 2012: 2650-2655. [16] KIM Y, WELLUM G, MELLO K, et al. Effects of relative humidity and particle and surface properties on particle resuspension rates [J]. Aerosol Science and Technology, 2016, 50(4): 339-352. [17] SALIMIFARD P, RIM D, GOMES C, et al. Resuspension of biological particles from indoor surfaces: Effects of humidity and air swirl [J]. Science of the Total Environment, 2017, 583: 241-247. [18] IBRAHIM A H, DUNN P F, BRACH R M. Microparticle detachment from surfaces exposed to turbulent air flow: Effects of flow and particle deposition characteristics[J]. Journal of Aerosol Science, 2004, 35(7):805-821. [19] HUBBARD J A, BROCKMANN J E, RIVERA D, et al. Experimental study of impulse resuspension with laser Doppler vibrometry [J]. Aerosol Science and Technology, 2012, 46(12): 1303-1312. [20] LICINA D, TIAN Y, NAZAROFF W W. Inhalation intake fraction of particulate matter from localized indoor emissions [J]. Building and Environment, 2017,123: 14-22. [21] HE M. Accessibilities and thermal environments of impinging jet ventilation and displacement ventilation in classrooms [D]. Shanghai, China: Donghua University, 2015 (in Chinese). [22] TSAI J H, WU Y L. Contributions of road dust resuspension to the airborne particle concentrations in Taipei [J]. Particulate Science and Technology, 1995,13(1): 55-67.
