Drag coefficient and settling velocity of fine particles with varying surface wettability

Wang, Lijun; Zheng, Kaixin; Ding, Ziyang; Yan, Xiang-Ping; Zhang, Haijun; Cao, Yijun; Guo, Chuwen

doi:10.1016/j.powtec.2020.05.102

Cited by 27 publications

(8 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[106] Gravitational Sedimentation Gravitational sedimentation refers to particle settlement under gravity action, which occurs predominantly in narrow airways and alveolar cavities where there is a small distance to be filled by the particles before reaching the walls. A particle settling under gravity will achieve a constant terminal settling velocity (Vt) from Stokes' law: [107] η ρ…”

Section: Inertial Impactionmentioning

confidence: 99%

Influence of Particle Size and Particle Deposition of Inhaled Medication in Lung Disease: A Comrehensive Review

Dudhat

Patel

2022

Int. J. Pharm. Sci. Drug Res.

View full text Add to dashboard Cite

Drug particles less than 5 µm have the greatest probability of deposition in the lung, whereas those less than 2 µm tend to be concentrated in the alveoli. A large proportion of particles within the 2-5 μm range are present in the dose released from the inhaled drug, providing a relatively even distribution across the lungs. The efficient need for inhaled therapy highly depends on the essence of the method of drug delivery and the patient's ability to correctly use the system. A large range of inhaler products, each with positive and negative aspects, are on the market. It facilitates the administration of a lower dose; there is a quicker onset of action and less severe side effects. The deposition of the inhaled drug in the lung is dependent on particle size, inhalation technique and the type of inhaler device. Importance of particle size distribution and Particle aerodynamic diameter, Influence of environmental humidity on particle size Particle deposition in the airways, Methods to identify drug deposition in lungs, Physiological factors which affect the therapeutic efficacy of pulmonary delivery drugs. The nano and micro size particles is a mainstay of treatment for a variety of pulmonary diseases because they provide a platform to deliver drugs directly reliably and inexpensively to the disease site, thus allowing for a minimum amount of drug to be used and minimize side effects.

show abstract

Section: Inertial Impactionmentioning

confidence: 99%

Influence of Particle Size and Particle Deposition of Inhaled Medication in Lung Disease: A Comrehensive Review

Dudhat

Patel

2022

Int. J. Pharm. Sci. Drug Res.

View full text Add to dashboard Cite

show abstract

“…Barry and Parlange (2018) proposed an expression of drag coefficient for spherical particle, drop, or bubble in an infinite homogeneous liquid. Terminal settling velocity and drag coefficient can be predicted accurately under different Reynolds numbers (Ma et al, 2020;Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

New model for predicting terminal settling velocity and drag coefficient of the Oncomelania

Liu

Wang

Chai

et al. 2022

Front. Environ. Sci.

View full text Add to dashboard Cite

This paper presents a study of the terminal settling velocity and drag coefficient of the Oncomelanias with highly irregular shape in the range of particle Reynolds number (10 < Rep < 600). The movement characteristics of the Oncomelanias with horizontal and slant postures are revealed using image analysis and wavelet analysis. The shape features of Oncomelanias with different dimensions are quantified and formulated. The authors propose a new model for predicting the drag coefficient of the dormant and active Oncomelanias, which is proven to be better than several widely-used formulas. Further, a simple settling velocity model that can predict the terminal velocity of the Oncomelanias fairly with several easy-to-measure parameters is developed. These findings provide a basis for the further improvement for the hydraulic schistosomiasis control project and supply reference for the settling characteristics and drag coefficient of cone-shaped particles.

show abstract

“…Thirdly, MPs are added additives during plastic production that causes MPs surface properties to be different from natural minerals, such as MPs have higher hydrophobicity than minerals 8 . Highly hydrophobic particles were shown to be subjected to lower drag force and thus settle at a higher speed than those with low hydrophobicity 13 . Therefore, the extensive knowledge of sediment hydrodynamics could not be straightforwardly applied to MPs but required more experimental evidence to connect this knowledge to MPs.…”

Section: Introductionmentioning

confidence: 99%

Settling behaviour of irregular-shaped polystyrene microplastics

Nguyen

2021

Sci.Tech.Dev.J.-Eng.Tech.

View full text Add to dashboard Cite

Microplastics are emerging pollutants that can pose threats to aquatic ecosystems by carrying toxic additives to the food web. Their abundance has been reported in many waterways globally, including the Sai Gon River, Vietnam. A good understanding of microplastic sinking behaviours can help predict the distribution and removal of these pollutants in water. Microplastic dynamics are still mostly assumed to be similar to that of suspended sediment. However, MPs possess many artificial properties that can make them move distinctly in the water from suspended sediment like densities, structures, shapes, and surface properties. This research, therefore, aims to investigate the correlation of the polystyrene microplastic size and irregular shapes with its vertical movement. The experiments employed the Particle Tracking Velocimetry (PTV) method and an automatic image processing algorithm to simultaneously measure MP geometrical properties and settling velocity while freely settling in a still water column. We found that the circumscribed diameter is the most appropriate geometrical parameter to represent MP size. The settling velocity of irregular-shaped polystyrene microplastics in size of 0.2 to 0.9 mm is mostly between 0.5 and 2 mm/s, half of the sediment but four-fold that of biological aggregates at the same size. The settling velocity increases two-fold when MP size enlarges from 0.2 to 0.9 mm. The shape irregularity can slow down the sinking of large microplastics but do not affect the vertical movement of microplastics smaller than 0.32 mm. The ratio between microplastic projected area and the area of the smallest circumscribed circle was found to be the two-dimensional representation of three-dimensional shapes in the correlation between size and settling velocity. Therefore, the fitting curve equations suggested herein can be used as a simple tool to estimate the settling velocity of irregular-shaped polystyrene microplastics found in many in-situ sampling campaigns.

show abstract

Drag coefficient and settling velocity of fine particles with varying surface wettability

Cited by 27 publications

References 31 publications

Influence of Particle Size and Particle Deposition of Inhaled Medication in Lung Disease: A Comrehensive Review

Influence of Particle Size and Particle Deposition of Inhaled Medication in Lung Disease: A Comrehensive Review

New model for predicting terminal settling velocity and drag coefficient of the Oncomelania

Settling behaviour of irregular-shaped polystyrene microplastics

Contact Info

Product

Resources

About