NUMERICAL SIMULATION OF AIR DUST FLOW IN A DUST COLLECTING NOZZLE WHEN DRILLING FLAT SURFACES

2021 ◽  
pp. 37-48
Author(s):  
Олег Викторович Тирон ◽  
Иван Николаевич Логачев ◽  
Константин Иванович Логачев
Keyword(s):  
Numerical Simulation ◽  
Computer Model ◽  
Air Flow ◽  
Dust Emission ◽  
Flow Simulation ◽  
Angular Speed ◽  
Dust Particles ◽  
Maximum Diameter ◽  
Dust Collection ◽  
Flat Surfaces

В процессе сверления стеновых конструкций электродрелями возникают значительные пылевыделения, негативно влияющие на здоровье человека и загрязняющие окружающее пространство. Актуальным является разработка компактных насадков-пылеуловителей, снижающих пылевыделения. Предложена конструкция пылеулавливающего насадка - отсоса для локализации пылевыделений при сверлении электродрелями плоских поверхностей. Для выбора необходимого расхода отсасываемого из насадка воздуха и наиболее рациональных его размеров разработана компьютерная модель движения пылевоздушного потока с учетом влияния вращения сверла. Использовался программный комплекс SolidWorks с расширением Flow Simulation, где численно решались уравнения Навье-Стокса и неразрывности, замкнутые при помощи k - ε модели турбулентности. Динамика пылевых частиц определялась численным решением дифференциального уравнения их движения с коэффициентом сопротивления Хендерсона. Для проверки адекватности и достоверности модели проведены экспериментальные замеры скорости воздушного потока, увлекаемого вращающимся сверлом. При помощи обработки полученных экспериментальных и расчетных значений скорости по статическим критериям оценены достоверность, адекватность модели, воспроизводимость экспериментов, теснота связи. В качестве критерия эффективности улавливания пыли насадком, используется величина максимального диаметра улавливаемых пылевых частиц. Выявлены закономерности изменения величины максимального диаметра от угловой скорости вращения сверла, изменении радиуса всасывающего отверстия и его удаленности от края насадка. В результате численного моделирования показано, что если не учитывать количество воздуха, увлекаемого вращающимся сверлом, то возможны значительные погрешности при определении максимального диаметра уловленных частиц. Разработанная компьютерная модель и выявленные закономерности улавливания пылевых частиц могут быть использованы для создания эффективного пылеулавливающего насадка. In the process of drilling wall structures with electric drills, significant dust emissions occur, which negatively affect human health and pollute the surrounding space. Development of compact nozzles-dust collectors that reduce dust emission is urgent. We offer a new design of a dust-collecting nozzle - suction for the localization of dust when drilling flat surfaces with electric drills. To select the required flow rate of air sucked out of the nozzle and its most rational dimensions, a computer model of the movement of the dust-air flow has been developed, taking into account the influence of the rotation of the drill. We used the software package SolidWorks , in the Flow Simulation extension where the Navier-Stokes and continuity equations were numerically solved using the k - ε turbulence model. The dynamics of dust particles was determined by numerically solving the differential equation of their motion with the Henderson drag coefficient. We carried out a number of experimental measurements of the speed of the air flow activated by the rotating drill to check the adequacy and reliability of the model. By processing the obtained experimental and calculated values of the velocity according to static criteria we assessed the reliability, adequacy of the model, reproducibility of experiments and tightness of the connection. As a criterion for the efficiency of dust collection by the nozzle, the value of the maximum diameter of the captured dust particles is used. As well we revealed some regularities of the change in the value of the maximum diameter from the angular speed of rotation of the drill, the change in the radius of the suction hole and its distance from the edge of the nozzle. As a result of numerical simulation, it is shown that not taking into account the air flow created by the rotating drill leads to significant errors, reaching 68%. The developed computer model and the revealed patterns of trapping dust particles can be used to create an effective dust-collecting nozzle.

scholarly journals NUMERICAL SIMULATION OF DUST-AIR FLOWS NEAR THE LOCAL VENTILATION EXTRACTION FROM DRILLING EQUIPMENT

2021 ◽  
Vol 6 (3) ◽  
pp. 36-46
Author(s):  
O. Tiron ◽  
K. Logachev
Keyword(s):  
Air Flow ◽  
Vertical Wall ◽  
Flow Simulation ◽  
Side Surface ◽  
Dust Particles ◽  
Maximum Diameter ◽  
Drilling Process ◽  
Air Flow Rate ◽  
Local Ventilation ◽  
Surrounding Space

A significant amount of dust is released during the drilling process. It negatively affects the cleanliness and ecology of the surrounding space, as well as human health. The design of a local extraction nozzle is proposed for dedusting the process of drilling concrete with standard drills. A computer model of the dust-air flow in the developed nozzle is created in the software package SolidWorks Flow Simulation. The dynamics of dust particles formed during drilling is numerically studied. The behavior of dust particles of different sizes is considered. It is proposed to use the value of the maximum diameter of dust particles completely captured by the suction channel as a criterion for the efficiency of dust particle capture. Three variants of the drilling plane arrangement are considered: floor, ceiling and vertical wall. The dependences of the maximum diameter of dust particles on the intake air flow rate, the distance of the extraction channel on the side surface of the nozzle to the place of its abutment to the drilling plane, and the radius of the suction channel are determined. The results obtained can be used to design and improve systems for capturing dust pollution generated during drilling. The formulated further directions of research are useful for researchers engaged in identifying the processes of capturing dust particles from mobile technological equipment.

Simulation of dust-air flow near a rotating disk cylinder suction unit

2019 ◽  
pp. 70-74
Author(s):  
A. B. Goltsov ◽  
K. I. Logachev ◽  
O. A. Averkova ◽  
V. A. Tkachenko
Keyword(s):  
Computer Model ◽  
Lateral Surface ◽  
Cylindrical Surface ◽  
Air Flow ◽  
Rotating Disk ◽  
Rotating Cylinder ◽  
Dust Removal ◽  
Dust Particles ◽  
Operating Parameters

A dust-air flow near a vertically located rotating cylinder with a suction unit located on the lateral surface was investigated. A computer model of this suction unit was developed, the effect of disks mounted on a cylindrical surface on the intake air flow and on the capture of dust particles in the suction unit, as well as the design and operating parameters of the proposed disk cylindrical suction (DCC), which reduce the dust loss. The influence of the size and number of discs, aspiration air flow on dust removal has been established. This design of a rotating disk cylinder suction unit can be used in aspiration shelters with the function of a dust-collecting chamber. Ill. 6. Ref. 15.

Dust distribution at a coal shearer in the face area

2020 ◽  
pp. 65-73
Author(s):  
A. S. Kobylkin
Keyword(s):  
Air Flow ◽  
Dust Emission ◽  
Sampling Procedure ◽  
Dust Particles ◽  
Dust Deposition ◽  
Particulate Emission ◽  
Face Area ◽  
Laboratory Test Results ◽  
The Face ◽  
Dust Distribution

Compliance with the Federal Code on Safety in Coal Mine, §22, No. 550 as of November 19, 2013 (as edited on January 1, 2020) dictates air dustiness and dust deposition control to be implemented in mines using stationary and mobile facilities. Application procedures of stationary controllers should be science-based and tested to provide reliable information. In particular, the procedures should indicate installation sites for the controllers and dictate revaluation of readings received from the controllers towards the dust explosion prevention in mines. Aimed to develop a framework for such procedures and to revise measurement areas for the movable controllers, dust distribution in roadways was studied. The studies have found out that particulate emission and dust distribution in the face area is complex due to mobility of the source of dust in the coal face area. Characteristics of dust particles govern their behavior in air flow. Thus, it is required to know characteristics of dust particles at the dust emission point to track their travel in roadways. A dust sampling procedure was developed to sample dust at a coal shearer. The data on characteristics of dust particles were also obtained. The mine and laboratory test results were used as the initial and boundary conditions in computational modeling. The mine researches and the modeling show that air flow is split into two parts in longwall. Dust produced by coal cutting by the shearer moves with air flow above the armored face conveyor. These results highlight the importance of taking into account local and head drags when selecting installation sites for controllers of air dust content and dust deposition in coal mines.

Study on the Sand/Dust Inject Approach in Sand/Dust Test System

2014 ◽  
Vol 543-547 ◽  
pp. 400-404
Author(s):  
Hong Wei Li ◽  
Hong Yan Li ◽  
Ying Dong ◽  
Hai Bo Han ◽  
Li Niu
Keyword(s):  
Numerical Simulation ◽  
Air Flow ◽  
Test System ◽  
Dust Particles ◽  
Key Factors ◽  
Similar System ◽  
Spray Method ◽  
Numerical Simulation Methods ◽  
Distribution Uniformity ◽  
Sand Dust

The velocity and concentration of sand/dust particles contained in the air flow are the key factors which affect the quality of sand/dust test. In order to obtain the anticipated sand/dust concentration and uniformity in the test segment, numerical simulation methods are adopted to study the characters of different sand/dust inject approaches. Research results indicated that the gravity sand/dust inject approach is not suitable for the large sand/dust test system, upstream spray approach is appropriate to be adopted in dust test, the uniformity of upstream sand spray method is better than downstream sand spray approach, but its diffusivity is not as good as the latter. In a certain range, the velocity difference between sand/dust spray flow and air flow affects the concentration distribution uniformity slightly. The numerical simulation results applied in the optimal design of particles inject system in some large sand/dust test system get a favorable progress. All results provide reference for the design of similar system and sand/dust environment test.

scholarly journals Theoretical study of the model of air flow movement near the shaped shelter of the rough grinding machine

2021 ◽  
pp. 26-37
Author(s):  
I. S. Kuptsova ◽  
Keyword(s):  
Air Flow ◽  
Dispersion Analysis ◽  
Dust Particles ◽  
Design Stage ◽  
Dust Collection ◽  
Abrasive Wheel ◽  
Closed Area ◽  
Flow Motion ◽  
Grinding Machine ◽  
Flow Velocities

Introduction. The article deals with the problems of choosing equipment for effective dust removal and subsequent dust collection. The dependences describing the fields of flow velocities in the closed area of the abrasive wheel, influencing the formation of streamlines of flow motion near the shaped shelter of the rough grinding machine, are considered. Problem Statement. The objective of this research is to develop a mathematical and computer model of the aspiration of a rough grinding machine. Theoretical Part. To accomplish the set task, the modern software Аnsys was used as well as the previously obtained results of the dispersion analysis of abrasive-cast iron dust during grinding, which had been carried out using a High-class device — an Analysette22 NanoTec laser granulometer. Conclusion. The results of the analysis, the obtained fields and the values of the air flow velocities in the workplace of the machine operator will be compared with the hovering rates of various dust particles, which will allow us to determine the efficiency of the rough grinding machine shelter, including at the design stage.

Numerical simulation of the dynamics of dust in a rotary dust collector with an adjustable air flow

2021 ◽  
pp. 70-75
Author(s):  
V. V. Koochetov ◽  
A. B. Gol’tsov ◽  
K. I. Logachev ◽  
O. A. Averkova ◽  
V. M. Kireev
Keyword(s):  
Numerical Simulation ◽  
Rational Design ◽  
Air Flow ◽  
Dust Particles ◽  
Operating Parameters ◽  
Dust Collector ◽  
Centrifugal Separator ◽  
Flow Regulator

A rotary dust collector has been developed that works on the principle of a centrifugal separator. A feature of its design is the presence of a bypass recirculation channel of cleaned air with a flow regulator, two outlet pipes with flow uncoilers in the form of spiral channels. The calculation of the motion of dust particles with a density of 3000 kg/m3 and a diameter of 1 to 100 microns has been performed. Research has been carried out to improve the efficiency of the apparatus using a central compositional plan and to establish rational design and operating parameters of the mixer for recirculating and purified air.

Reduction of dust extraction from an aspiration shelter due to mechanical shielding

2020 ◽  
pp. 65-71
Author(s):  
O. A. Averkova ◽  
A. B. Goltsov ◽  
K. I. Logachev ◽  
A. V. Minko
Keyword(s):  
Differential Equation ◽  
Velocity Field ◽  
Integral Equations ◽  
Boundary Integral Equations ◽  
Air Flow ◽  
Boundary Integral ◽  
Dust Particles ◽  
Maximum Diameter ◽  
Dust Extraction ◽  
Dust Dynamics

The dust dynamics in an aspiration shelter equipped with various thin mechanical screens is considered. To calculate the trajectories of dust particles, the differential equation of their motion was used, the velocity field of the air flow was calculated by the method of boundary integral equations. The influence of different mechanical screens on the maximum diameter of dust particles is determined. It is shown that when using curved mechanical screens it is possible to significantly reduce dust extraction in the suction network.

MR-deDuster: A Dust Emission Separator in Air Pollution Control

2014 ◽  
Vol 68 (5) ◽  
Author(s):  
H. Norelyza ◽  
M. Rashid ◽  
S. Hajar ◽  
A. Nurnadia
Keyword(s):  
Air Pollution ◽  
Flue Gas ◽  
Pollution Control ◽  
Collection Efficiency ◽  
Dust Emission ◽  
Dust Particles ◽  
Air Pollution Control ◽  
Dust Collection ◽  
Gas Cleaning ◽  
Dust Collection Efficiency

There are many technologies developed to control dust emission in industry. A multi-cyclones separator is one of the commonly available technologies for dust emission control from a gas stream. However, it is usually used as a pre-cleaner unit installed prior to a more efficient air pollution control system such as fabric filters or baghouse. In this respect, a study has been carried out to investigate and theoretically predict the performance of a MR-deDuster, a newly developed multi-cyclones dust emission separator system. The MR-deDuster performance was measured by its collection efficiency based on the particle size distribution of two selected adsorbent material commonly used as flue gas cleaning agent, i.e., lime and activated carbon, as a representative of dust particles. The study illustrates that the unit manages to capture dust sized 2.4µm at 50% collection efficiency with reasonably low pressure drop. The unit also capable of achieving more than 95% total dust collection efficiency for all dust tested.  

scholarly journals Laptop cooling numerical simulation using Computational Fluid Dynamics

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Syamsuri Syamsuri ◽  
ZA Fairuz ◽  
KDT Alfonsus
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Temperature Distribution ◽  
Flow Velocity ◽  
Air Flow ◽  
Flow Simulation ◽  
Air Flow Rate ◽  
Final Project ◽  
Air Flow Velocity

Laptop’s cooling solution is very important. In some cases, due to poor cooling an over heat on the mother board, main chip, and other components occurs, so that the laptop is quickly broken. Therefore it is necessary to know the temperature distribution so that over heat can be overcome. One of the methods to determine the temperature distribution in this final project is a flow simulation, using CFD (Computational Fluid Dynamics), 3D method with the variation if different air flow velocity, i.e. 5 m/s, 10 m/s, and 15 m/s. The higher the air flow rate, the higher the cooling occurs. From the temperature contours it is shown that the hot temperature is built up on the back of the heat sink. The results of the validation of this study and previous studies obtained an error that occurred was around 4%.Keywords: CFD, variation of air flow velocity, laptop.

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