某型虚拟冲击器的设计及数值模拟

Abstract

Abstract: The virtual impactor inhales aerosols from the air and collects particulates with specific size. In general, the commonly used virtual impacter has large cutting particle size and works at large flow rate, which may not be applicable to some conditions with limited flow. In this study, a new multi-slit virtual impactor is developed. Its main characteristics are that the impactor can work at high flow rate and low pressure drop. Clean air is injected near the nozzle, which can reduce the loss of aerosol in the impactor. The performance of the virtual impactor was analyzed through numerical simulation. The results show that the cutting particle size of the virtual impactor can reach to 0.2-0.4 μm, and the low pressure drop of 0.08 atm can be obtained even if the total flow is 36 L/min. The cutting particle size can be reduced even smaller by using the virtual impactor with clean air with slit nozzles, and can be collected at a flow rate of 1.8 L/min.

Key words: virtual impactor, aerosols, numerical simulation

CLC Number:

TL75

MA Tao, YANG Yi, SHANG Jie, LI Jianwei, MA Yinghao, CHANG Xiang. Design and numerical simulation of a virtual impactor[J].RADIATION PROTECTION, 2021, 41(4): 359-364.

References

[1] 吕阳,徐立大,刘凡.虚拟冲击器的研究进展[J].卫生研究,2001,(02):125-127.
[2] Hounam R F, Sherwood R J. The cascade centripeter: a device for determining the concentration and size distribution of aerosols[J]. American Industrial Hygiene Association Journal, 1965, 26(2): 122-131.
[3] Conner W D. An inertial-type particle separator for collecting large samples[J]. Journal of the Air Pollution Control Association, 1966, 16(1): 35-38.
[4] 张佩,赵永凯,杨巍,等.亚微米粒子虚拟冲击器的研制[J].中国激光,2014,41(01):244-249.
ZHANG Pei, ZHAO Yongkai, YANG Wei et al. Development of a virtual impactor for submicron particles[J].Chinese Journal of Lasers,2014,41(01):244-249.
[5] Ding Y, Koutrakis P. Development of a dichotomous slit nozzle virtual impactor[J]. Journal of Aerosol Science, 2000, 31(12): 1421-1431.
[6] Bergman W, Shinn J, Lochner R, et al. High air flow, low pressure drop, bio-aerosol collector using a multi-slit virtual impactor[J]. Journal of Aerosol Science, 2005, 36(5-6): 619-638.
[7] Marple V A, Liu B Y H, Burton R M. High-volume impactor for sampling fine and coarse particles[J]. Journal of the Air & Waste Management Association, 1990, 40(5): 762-767.
[8] Haglund J S, McFarland A R. A circumferential slot virtual impactor[J]. Aerosol Science and Technology, 2004, 38(7): 664-674.
[9] Zahir M Z, Heo J E, Yook S J. Effects of three-partitioned horizontal inlet and clean air on collection efficiency and wall loss of slit virtual impactors[J]. Aerosol and Air Quality Research, 2018, 18(5): 1131-1140.
[10] Loo B W, Cork C P. Development of high efficiency virtual impactors[J]. Aerosol Science and Technology, 1988, 9(3): 167-176.
[11] Sioutas C, Koutrakis P, Burton R M. Development of a low cutpoint slit virtual impactor for sampling ambient fine particles[J]. Journal of Aerosol Science, 1994, 25(7): 1321-1330.
[12] Lee P, Chen D R, Pui D Y H. Experimental study of a nanoparticle virtual impactor[J]. Journal of Nanoparticle Research, 2003, 5(3): 269-280.
[13] Lee H, Jo D H, Kim W G, et al. Effect of an orifice on collection efficiency and wall loss of a slit virtual impactor[J]. Aerosol Science and Technology, 2014, 48(2): 121-127.
[14] Middha P, Wexler A S. Design of a slot nanoparticle virtual impactor[J]. Aerosol Science and Technology, 2006, 40(10): 737-743.
[15] 苗利婷. 高效空气过滤器性能及其测试系统研究[D].东北大学,2009.
[16] Masuda H, Nakasita S. Classification performance of a rectangular jet virtual impactor—Effect of nozzle width ratio of collection nozzle to acceleration jet[J]. Journal of Aerosol Science, 1988, 19(2): 243-252.
[17] De La Mora J F, Rao N, McMurry P H. Inertial impaction of fine particles at moderate Reynolds numbers and in the transonic regime with a thin-plate orifice nozzle[J]. Journal of Aerosol Science, 1990, 21(7): 889-909.
[18] Forney L J, Ravenhall D G, Lee S S. Experimental and theoretical study of a two-dimensional virtual impactor[J]. Environmental Science & Technology, 1982, 16(8): 492-497.
[19] Fluent ANSYS. Fluent 14.0 user's guide[Z]. ANSYS FLUENT Inc, 2011:123.

Design and numerical simulation of a virtual impactor

PDF (PC)

Like

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 11

Metrics

Comments

Recommended 10

[1]	LI Ting, ZHU Jun, LIU Tuantuan, ZHANG Aiming. The impact of construction of port approaching industrial zone ondilution and diffusion of liquid effluent from a nuclear power plant [J]. RADIATION PROTECTION, 2020, 40(6): 593-604.
[2]	ZHANG Yu, XU Wei, CHU Haoran, ZHENG Bowen, RUAN Jiasheng, HOU Bonan. Study on air intake structures of a resin decomposition reactor through a numerical simulation method [J]. RADIATION PROTECTION, 2020, 40(5): 435-442.
[3]	GUO Dongpeng, WANG Ran, ZHAO Peng, LI Yunpeng, YAO Rentai, LIU Yao. Numerical simulation study on the effect of thermal stratificationon the flow field around buildings [J]. RADIATION PROTECTION, 2020, 40(4): 290-300.
[4]	LIU Ping, ZHAO Liang, JIAO Dading, WAN Jiajie, YANG Hongrui. Study on axial thermal conductivity of bentonite-sand mixed buffer layers [J]. RADIATION PROTECTION, 2020, 40(2): 126-136.
[5]	LI Guoqiang, LI Zhiqiang, LUO Xiaowei. Impact test and numerical simulation on a model container for transport of medical radioactive sources [J]. RADIATION PROTECTION, 2020, 40(1): 52-57.
[6]	ZHANG Jing, LI Zhou, LI Pengxiang, BAO Li, WANG Ruijun, SONG Qinnan, MA Xuyuan, YI Wujing. Influence of ²¹⁰Bi on calculation of ²¹⁰Po activity concentration in air aerosol [J]. RADIATION PROTECTION, 2020, 40(1): 10-15.
[7]	ZHANG Zhidong, CHI Xiangyu, PAN Yuelong, HE Junshan, WANG Naihua. Design and numerical simulation of a supercritical water oxidation reactor for spent resins [J]. RADIATION PROTECTION, 2019, 39(5): 416-422.
[8]	ZHANG Kun, HE Zeyin, ZHANG Tao, YANG Chuan, HUA Weixing, CAO Xingwei, LIU Hukai. Numerical simulation and experimental studyon reactive coating decontaminant spray [J]. RADIATION PROTECTION, 2019, 39(4): 304-308.
[9]	Liu Tuantuan, Deng Anchang, Zhu Jun, Yu Haiyuan, Lin Jianguo, Zhang Aiming. Preliminary study on discharge scheme of low level liquid radioactive wastes from nuclear facility at oceanic mesoscale [J]. RADIATION PROTECTION, 2017, 37(5): 404-410.
[10]	Chen Ai, Zhou Ruidong, Chen Wentao, Liao Jianhua, Lai Liming. Numerical simulation of γ radiation measurement in rainfall [J]. RADIATION PROTECTION, 2017, 37(5): 361-368.
[11]	Ye Yongjun, Dai Xintao, Ding Dexin, Jiang Juntin, Li Zhi. Theoretical study on law of radon exhalation in radioactive water containing radon [J]. RADIATION PROTECTION, 2017, 37(1): 56-61.