THE EFFECT OF THE COEFFICIENT OF RESTITUTION TO THE PARTICLE COLLECTION EFFICIENCY DURING THE PROCESS OF MAGNETIC FILTRATION - NUMERICAL APPROACH

In the present study, the effect of the coefficient of restitution to the particle collection efficiency of magnetic filter during magnetic filtration of a fluid will be examined. Initially, are described the available mathematical models that give efficiency of magnetic filtration in relation to various parameters and physical quantities. Also, the role of coefficient of restitution in the magnetic filtration models will be reported. Furthermore, is formulated the basic equation that examines the change of filtration efficiency with regard to the coefficient of restitution. In the last step, a numerical example with given values from a real magnetic filter will be applied and the characteristic curves of magnetic filter will be drawn. The general conclusion that we have is that as the coefficient of restitution increases, the efficiency of magnetic filter decreases. The efficiency of magnetic filter converges in the same value, when there is elastic collision of a filtered particle.

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DETERMINATION OF AEROSOLS POLLUTANTS ON MEMBRANES. EVALUATION OF PARTICLE COLLECTION EFFICIENCY AND LEAD CONCENTRATION IN AEROSOLS

Environmental Engineering and Management Journal ◽

10.30638/eemj.2011.085 ◽

2011 ◽

Vol 10 (5) ◽

pp. 621-627

Author(s):

Mihaela Emanuela Craciun ◽

Niculina Nina Badea ◽

Ovidiu Gales ◽

Florian Aldea

Keyword(s):

Lead Concentration ◽

Collection Efficiency ◽

Particle Collection

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Uncertainty assessment of current size-resolved parameterizations for below-cloud particle scavenging by rain

Atmospheric Chemistry and Physics ◽

10.5194/acp-10-5685-2010 ◽

2010 ◽

Vol 10 (12) ◽

pp. 5685-5705 ◽

Cited By ~ 83

Author(s):

X. Wang ◽

L. Zhang ◽

M. D. Moran

Keyword(s):

Size Distribution ◽

Collection Efficiency ◽

Theoretical Calculations ◽

Terminal Velocity ◽

Moderate Intensity ◽

Size Spectrum ◽

Cloud Particle ◽

Particle Collection ◽

Particle Scavenging ◽

Empirical Size

Abstract. Current theoretical and empirical size-resolved parameterizations of the scavenging coefficient (Λ), a parameter commonly used in aerosol transport models to describe below-cloud particle scavenging by rain, have been reviewed in detail and compared with available field and laboratory measurements. Use of different formulations for raindrop-particle collection efficiency can cause uncertainties in size-resolved Λ values of one to two orders of magnitude for particles in the 0.01–3 μm diameter range. Use of different formulations of raindrop number size distribution can cause Λ values to vary by a factor of 3 to 5 for all particle sizes. The uncertainty in Λ caused by the use of different droplet terminal velocity formulations is generally small than a factor of 2. The combined uncertainty due to the use of different formulations of raindrop-particle collection efficiency, raindrop size spectrum, and raindrop terminal velocity in the current theoretical framework is not sufficient to explain the one to two order of magnitude under-prediction of Λ for the theoretical calculations relative to the majority of field measurements. These large discrepancies are likely caused by additional known physical processes (i.e, turbulent transport and mixing, cloud and aerosol microphysics) that influence field data but that are not considered in current theoretical Λ parameterizations. The predicted size-resolved particle concentrations using different theoretical Λ parameterization can differ by up to a factor of 2 for particles smaller than 0.01 μm and by a factor of >10 for particles larger than 3 μm after 2–5 mm of rain. The predicted bulk mass and number concentrations (integrated over the particle size distribution) can differ by a factor of 2 between theoretical and empirical Λ parameterizations after 2–5 mm of moderate intensity rainfall.

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Effect of Zeta Potential of Particles Dispersed in an Aqueous Solution on Magnetic Filtration Efficiency

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2004.830705 ◽

2004 ◽

Vol 14 (2) ◽

pp. 1554-1557 ◽

Cited By ~ 2

Author(s):

S. Sato ◽

K. Mitsuhashi ◽

T. Ohara

Keyword(s):

Aqueous Solution ◽

Zeta Potential ◽

Filtration Efficiency ◽

Magnetic Filtration

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Electrohydrodynamic gas flow in a positive polarity wire-plate electrostatic precipitator and the related dust particle collection efficiency

Journal of Electrostatics ◽

10.1016/j.elstat.2005.06.006 ◽

2006 ◽

Vol 64 (3-4) ◽

pp. 259-262 ◽

Cited By ~ 57

Author(s):

Janusz Podliński ◽

Jarosław Dekowski ◽

Jerzy Mizeraczyk ◽

Drazena Brocilo ◽

Jen-Shih Chang

Keyword(s):

Dust Particle ◽

Gas Flow ◽

Electrostatic Precipitator ◽

Collection Efficiency ◽

Positive Polarity ◽

Particle Collection

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A Numerical Approach to Slip Flow of a Micropolar Fluid above A Flat Permeable Contracting Surface

International Journal of Applied Mechanics and Engineering ◽

10.2478/ijame-2021-0026 ◽

2021 ◽

Vol 26 (2) ◽

pp. 173-185

Author(s):

R. Parthiban ◽

G. Palani ◽

Seema Tinker ◽

R. P. Sharma

Keyword(s):

Mathematical Modeling ◽

Stagnation Point ◽

Micropolar Fluid ◽

Couple Stress ◽

Slip Flow ◽

Numerical Approach ◽

Numerical Results ◽

Polar Liquid ◽

Stagnation Point Flow ◽

Physical Quantities

Abstract A plain linear penetrable contracting sheet with slip over a micro-polar liquid with a stagnation-point flow is analyzed. Through similarity mapping, the mathematical modeling statements are transformed as ODE’s and numerical results are found by shooting techniques. The varying impacts of physical quantities on the momentum, micro-rotation, and temperature were demonstrated through graphs. The computed measures including shear and couple stress with distinct measures of factors involved in this proposed problem are presented through a table.

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Case Study on the Efficiency of Recycling Companies’ Waste Paper Collection Stations in Japan

Sustainability ◽

10.3390/su132011536 ◽

2021 ◽

Vol 13 (20) ◽

pp. 11536

Author(s):

Xiaoyue Liu ◽

Jeongsoo Yu ◽

Kazuaki Okubo ◽

Masahiro Sato ◽

Toshiaki Aoki

Keyword(s):

Collection Efficiency ◽

Waste Paper ◽

Current Status ◽

Collection System ◽

Trade Area ◽

Operational Characteristics ◽

The Government ◽

Families With Children

Each year, a large amount of waste paper (WP) is generated in Japan, and due to the change in lifestyle with the COVID-19 pandemic, the WP collection and recycling system in Japan faces new challenges. Although the government of Japan has installed WP collection systems, the efficiency of these traditional WP collection systems is too low, and this causes inconvenience to the governments, residents, and other stakeholders. On the other hand, some recycling companies in Japan are trying to establish a nontraditional WP collection system by setting their own WP collection stations in cooperative supermarkets. Yet, the efficiency of this new system has not been clarified. This research aims to investigate the current status, operational characteristics, and the role of recycling companies’ WP collection stations in the Japanese WP collection system. By performing trade area analysis and stepwise OLS regression, this research will evaluate WP collection stations’ efficiency. Moreover, this research will also discuss how the new WP collection system improves WP collection efficiency and residents’ convenience. The results show that WP collection stations efficiency is particularly high in large supermarkets with many parking spaces and long business hours, as well as in areas with many families with children. Recycling companies’ WP collection system could create a system, which can satisfy resident, government, and recycling company interests at the same time.

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Effect of different lubricating oil formulas on the adaptability of cGPF aftertreatment

E3S Web of Conferences ◽

10.1051/e3sconf/202126801009 ◽

2021 ◽

Vol 268 ◽

pp. 01009

Author(s):

Songwei Yang ◽

Guotian Li ◽

Chuanqi Wang ◽

Zenghui Yin ◽

Enxing Zhang

Keyword(s):

Ct Scan ◽

Critical Point ◽

Fuel Consumption ◽

Collection Efficiency ◽

Filtration Efficiency ◽

Lubricating Oil ◽

Emission Standard ◽

Detergent System ◽

Uniform Deposition

Based on two different components of lubricating oil, this paper analyzes the filtration efficiency, ash accumulation speed, vehicle WLTC emissions, fuel consumption, and CT scan on a National V emission standard engine equipped with a cGPF aftertreatment device. The results show that both oils can ensure that cGPF meets the emission and fuel consumption requirements of National VI emission standard, but oil F accumulates ash quickly before the ash accumulation of 33% in the discharge, which has a significant effect on PN reduction, and oil C accumulates ash faster after the accumulation of 33%. The effect of reducing the PN is accelerated. Oil F is based on a full calcium detergent system, which has a trend of first to slower for the collection efficiency; while oil C is based on a mixed Ca/Mg detergent system, which has a trend of first slowing and then fasting the collection efficiency. The critical point is generally about 33% of accumulated ash. For oil F, less ash is deposited in the front and middle of the cGPF, while more ash tends to deposit towards the outlet. In contrast, cGPF aged with Oil C has a relatively uniform deposition distribution.

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