Numerical study on particle removal performance of pickup head for a street vacuum sweeper

Wu, Bing-Fei; Men, Jinlai; Chen, Jie

doi:10.1016/j.powtec.2010.02.001

Cited by 25 publications

(51 citation statements)

References 17 publications

(22 reference statements)

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“…As can be seen from Table 3, at the inlet of the dust suction port, the boundary condition for the relative pressure is set to 0 Pa, and at the outlet of the outlet duct, the boundary condition for the relative pressure is set to −1800 Pa (Ke, Liu, Wang, & Deng, 2017;Qin et al, 2016;Wei, 2016;Wu, Men, & Chen, 2010;Zheng, 2016). The DPM is used to simulate the motion of the dust particles, and it is assumed that the discrete phase particles injected into the airflow field be spherical in equal diameter.…”

Section: Boundary Conditions and Algorithmsmentioning

confidence: 99%

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Liu

Zhang

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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A gravity settling chamber plays an important role in improving the effect of the dust removal when it is selected as a dust collector in a pneumatic cleaning system for cleaning a subway tunnel. The settling rate and the indexes evaluating the secondary blowing are studied to assess the effect of the dust removal in this paper. Regarding the length of the settling chamber, the height of the inlet duct, and the diameter and height of the outlet duct as the variables of the key structures, a flow field simulation analysis of the gravity settling chamber with different heights of the dust accumulation is carried out, then the key structure parameters are optimized by means of the experimental method of uniform design. Finally, the settling chamber with an excellent dust removal effect is obtained. Major conclusions can be drawn as follows. (1) The maximum velocity and the mean velocity ratio of the airflow near a dust accumulation surface are important evaluation indexes for judging the secondary blowing. (2) The maximum velocity near a dust accumulation surface usually doesn't appear on the vertical plane through the axis of the inlet duct or the outlet duct. (3) An excellent settling effect can be ensured during the whole cleaning process only when the maximum design height of the dust-accumulation surface is considered as a key working condition. (4) An excellent settling effect can be realized if the settling chamber without any filtering device and affiliated baffle structure are long enough. (5) The secondary blowing can be avoided if the inlet and outlet of the setting chamber are far away from the dust-accumulation surface. This study has a good guiding significance for the design of gravity settling chamber.

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Section: Boundary Conditions and Algorithmsmentioning

confidence: 99%

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Liu

Zhang

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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“…It is regarded as one of the best natural chelators for trace metals (Chui et al 1996). The chitosan molecule is sufficiently flexible to form a helical structure around metal ions (Ogawa et al 1993), which forms multiple coordination bonds with each ion (Wu et al 2010). Metal sorption can be augmented by physically modifying the chitosan sorbent.…”

Section: Remediation Of Inorganic Contaminants In Aqueous Systemsmentioning

confidence: 99%

“…The -NH 2 and -OH groups in the chitosan molecule form complexes with metal-based analytes (Wu et al 2010). The affinities of metal ions to chitosan are different, depending on the presence of soft, borderline, or hard Lewis bases of pristine or modified chitosan.…”

Section: Chitosan-based Sensorsmentioning

confidence: 99%

“…This lack of toxicity, coupled with its rapid degradability, makes chitosan suitable for several environmental and agricultural uses (Uthairatanakij et al 2007). Some applications of chitosan include drug delivery in the human gastrointestinal tract (Cook et al 2013), a role in food processing (Dutta et al 2009;Romanazzi et al 2012), biomedical use (Dash et al 2011;Jayakumar et al 2010;Khor and Lim 2003;Kim et al 2007;Muzzarelli 2009), an ingredient in cosmetics (Desbrieres et al 2010), enzyme immobilization (Krajewska 2004), serving as a heterogeneous catalyst (Guibal 2005), a sorbent for organic and inorganic contaminants (Guibal et al 2006;Wan Ngah et al 2011;Wu et al 2010;Yong et al 2012), a component of antimicrobial products (Kong et al 2010), and as an agent to help recover uranium (Muzzarelli 2011). Soil and water pollution by organic and inorganic contaminants, including metal (loid)s, is of growing concern, because of their potential detrimental effects on human health and the environment (Adriano 2001).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reviews of Environmental Contamination and Toxicology Volume 233

Whitacre¹

2015

Reviews of Environmental Contamination and Toxicology

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“…Another way to improve particle collection efficiency is to change the operational conditions. Wu et al [14] numerically studied particle collection performance under different operational conditions, such as traveling speed and pressure drop, and finally proposed a trade-off suggestion. There have been relatively fewer scientific reports and analyses of vacuum-blowing cleaning systems.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Particle-Collection Efficiency for Vacuum-Blowing Cleaning System Based on Operational Conditions

et al. 2020

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The dust-collection system, as the core of a sweeper vehicle, directly inhales dust particles on the pavement. The influence of variable operational conditions on particle-separation performance was investigated using computational fluid dynamics (CFD) Euler–Lagrange multiphase model. The particle-separation performance efficiency and retention time were used to evaluate the dust-collection efficiency. The uniform design (UD) and multiple regression analysis (MRA) methods were employed to predict and optimize the effects of reverse-blowing flow rate, pressure drop, and traveling speed on separation efficiency. The results indicated that the dust-collection performance initially increased and then decreased with increasing reverse-blowing flow rate. As the pressure drop increased, there was an increase in total dust-collection efficiency. However, the efficiency decreased with increasing traveling speed. The regression model showed that the proposed approach was able to predict the particle collection efficiency accurately. In addition, the optimum operational conditions were obtained, namely a reverse-blowing flow rate of 2100 m3/h, a traveling speed of 5 km/h, and a pressure drop of 2400 Pa. The maximum particle-separation efficiency was 99.10%, which showed good agreement with the experimental results.

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Numerical study on particle removal performance of pickup head for a street vacuum sweeper

Cited by 25 publications

References 17 publications

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Reviews of Environmental Contamination and Toxicology Volume 233

Prediction of Particle-Collection Efficiency for Vacuum-Blowing Cleaning System Based on Operational Conditions

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