The impact of airflow and air purification on the resuspension and removal of deposited particulate matter

Kim, Min Young; Jung, Yong Gi; Park, Jin Chul; Yang, Young Kwon

doi:10.1016/j.jobe.2021.102367

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…M.Y. Kim et al (2021) presented the results of a study on the influence of the amount of airflow on the level of air purification in the filter elements of motorized filter respirators. Specifically, the authors considered the possibility of cleaning filters from settled dust by applying a reverse flow of air.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2023

Tehnìka ta energetika

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The lack of simple analytical physical and mathematical models complicates the investigation of the interaction of tillage working bodies with the soil when designing new structures. To simplify these calculations within the framework of agricultural machinery engineering, it is necessary to use software that integrates the development of agricultural mechanics. The purpose of this study was to model and investigate the interaction of tillage working bodies with the soil using Simcenter STAR-CCM+. For this, the volumetric fluid method and the discrete element method were used. When creating the model, the main physical and mechanical properties of the soil were used. As a result, the simulation of the interaction of the most common tillage working bodies, such as a tooth of a duck-foot cultivator, a disc harrow on an elastic stand, a subsoil cultivator (chisel plough), a mouldboard plough, and a smooth roller, was modelled using volumeof-fluid method and discrete element method. The application of the volume-of-fluid method helped establish a nonprimary flow of the soil relative to the working body, while the discrete element method determined the distributions of velocities and forces of interaction of soil particles. It was found that both proposed methods can be useful for modelling the interaction of the tillage working body with the soil in Simcenter STAR-CCM+. Complementing each other, they create a general picture of the physics of the interaction of the tillage tool with the soil. Using Simcenter STAR-CCM+, the interaction process was visualized and the height of the formed ridges and furrow depths and their location in space were

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Section: Introductionmentioning

confidence: 99%

Untitled

2023

Tehnìka ta energetika

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“…Each mentioned study had in common the measurement of PM 10 , and the general conclusion is that the indoor PM concentration is obviously strictly related to the outdoor PM concentration; a possible measure in the case of registering high PM values could be represented by air purification filters, especially on premises where a large and young part of the population is situated, namely in schools [11]. As a provisionary measure, the amount of indoor particulate matter may be reduced, with moderate expense [16] and high efficiency [17], through utilization of air purifiers [16], although, as specified in [18], the effectiveness of this process is highly dependent on the resuspension factors that can vary from the surface and purpose of the indoor space, the number of people using that space, heating, cooling or ventilation means, etc. All these factors can be utilized in concordance with data related to meteorological conditions, and the possible utilization of purifiers might thus become more efficient.…”

Section: Introductionmentioning

confidence: 99%

A Study on Indoor Particulate Matter Variation in Time Based on Count and Sizes and in Relation to Meteorological Conditions

Bodor

2021

Sustainability

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An important aspect of air pollution analysis consists of the varied presence of particulate matter in analyzed air samples. In this respect, the present work aims to present a case study regarding the evolution in time of quantified particulate matter of different sizes. This study is based on data acquisitioned in an indoor location, already used in a former particulate matter-related article; thus, it can be considered as a continuation of that study, with the general aim to demonstrate the necessity to expand the existing network for pollution monitoring. Besides particle matter quantification, a correlation of the obtained results is also presented against meteorological data acquisitioned by the National Air Quality Monitoring Network. The transformation of quantified PM data in mass per volume and a comparison with other results are also addressed.

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Improvement of motorized design filtering respirator

Slavinskyi¹,

Bilko²,

Cheberyachko³

et al. 2023

Tehnìka ta energetika

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Working conditions, in terms of hygiene, harmful impurities in the air of the working area, often do not meet regulatory requirements. In such cases, motorized filter respirators are used to protect respiratory organs, which require the development of an appropriate system for managing operational indicators for effective operation. The purpose of the article was to improve the control system of a motorized filter respirator to increase protective efficiency, due to the development of a new parametric scheme of the control object, taking into account the functional relationships between the operating mode, air flow, filter resistance and the term of protective action. To create an appropriate control system, a structural-parametric synthesis of operational indicators management was applied, based on the relationships between the main variables (outgoing regulated variables, controlling influences and disturbances). A new working diagram of the control object with selected design elements of the blower has been developed, the main difference of which is the use of the “Arduino Uno R3” board, the “LCD Keypad Shield” module with a two-line display for controlling the air flow modes, in accordance with the change of the filter resistance taking into account the accumulation dust deposit based on the assumption that the transfer function can be represented by an aperiodic link of the 1st order with sufficient accuracy for practice. To work out the operating modes and determine the duration of the protective effect, a software model of the operation of the motorized filter respirator was created, which made it possible to evaluate the influence of the dust concentration on the change in air flow through the filter elements, taking into account the accumulation of dust sediment on the protective effectiveness. Recommendations have been developed to ensure the effective functioning of the protective device in accordance with the requirements under the most unfavorable conditions. The practical value of the work lies in the fact that the modes of movement of the air flow are determined, in accordance with the speed of rotation of the fan blade from the width of the PWM pulses, which depend on the resistance of the filter, the accumulation of dust deposits based on the transfer function

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The impact of airflow and air purification on the resuspension and removal of deposited particulate matter

Cited by 3 publications

References 18 publications

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Untitled

A Study on Indoor Particulate Matter Variation in Time Based on Count and Sizes and in Relation to Meteorological Conditions

Improvement of motorized design filtering respirator

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