Reduced dust generation when loading hoppers with powdered material. Part 2. Results of numerical-experimental studies

2021 ◽  
pp. 64-71
Author(s):  
A. S. Seminenko ◽  
K. I. Logachev ◽  
A. V. Goltsov ◽  
O. A. Averkova
Keyword(s):  
Rational Design ◽  
Bulk Material ◽  
Experimental Studies ◽  
Powdered Material ◽  
Coanda Effect ◽  
Dust Formation ◽  
Technological Parameters ◽  
Dust Generation ◽  
Material Part ◽  
Coandǎ Effect

On the basis of the obtained analytical dependencies, the expediency of fan loading of bunkers with powdery bulk material has been proved. The design of an annular charging device, which reduces dust formation, using the Coanda effect is proposed. The rational design and technological parameters of the developed device are numerically and experimentally determined.

scholarly journals RESEARCH OF THE OF BULK MATERIAL MOVEMENT PROCESS IN THE INACTIVE ZONE BETWEEN SCREW SECTIONS

2020 ◽  
Vol 60 (1) ◽  
pp. 261-268
Author(s):  
O.M. Trokhaniak ◽  
R.B. Hevko ◽  
O.L. Lyashuk ◽  
T.A. Dovbush ◽  
B.V. Pohrishchuk ◽  
...  
Keyword(s):  
Optimal Design ◽  
Bulk Material ◽  
Experimental Studies ◽  
Screw Conveyor ◽  
Technological Parameters ◽  
Movement Process ◽  
Curved Paths ◽  
Agricultural Materials

The article presents the results of theoretical and experimental studies of the process of moving bulk material in the inactive zone between hinged screw sections of a flexible screw conveyor. The influence of the gap between the edges of adjacent screw sections and the magnitude of their circular displacement on the process of continuous transportation of bulk material is presented. The results of theoretical and experimental studies are compared. This will allow choosing the optimal design, kinematic and technological parameters of the developed sectional screw working body when transporting bulk agricultural materials along curved paths, both in horizontal and inclined directions, as well as along curved paths.

A New Concept in Design of Rheolytic Thrombectomy Devices: The Coanda Effect

2009 ◽  
Author(s):  
Cheng-Shiu Chung ◽  
Sergio L. Cornejo ◽  
Ming Huo ◽  
Ender A. Finol
Keyword(s):  
Pressure Distribution ◽  
High Speed ◽  
Experimental Studies ◽  
Pressure Sensors ◽  
Surface Velocity ◽  
Coanda Effect ◽  
Ambient Fluid ◽  
Mixing Rate ◽  
Coandǎ Effect ◽  
Coanda Flow

The Coanda effect, which was first named by Henri Coanda in 1910, is the phenomenon when a fluid, gas or liquid, attaches to a solid surface, called the Coanda surface. The direction of this adhered flow changes along with the surface because of the Van der Walls forces or surface tension. Therefore, the pressure distribution of the ambient fluid is also altered due to the bent attached Coanda flow. The fluid material properties, Coanda flow velocity, curvature of the Coanda surface, velocity of the ambient fluid flow, and distance to the wall above the Coanda flow are the primary factors affecting this pressure distribution. In experimental studies, Panitz and Wasan [1] evaluated the pressure distribution of the Coanda effect by using pressure sensors on the Coanda surface and a colored dye solution in the flow. By means of photographs and experimental data, they describe the influence of different heights of the shroud (a sheath plate above the Coanda surface) and the secondary flow entrainment (flow of ambient fluid) on the pressure profiles. Vortices occur beneath the Coanda flow when the height of the shroud is lower than a specified reference. Cutbill et al. [2] developed a high speed Coanda flow k-ε turbulence model in the application of PHOENICS to improve the prediction of the mixing rate, shock wave structure and flow separation. The pressure drop occurs near the Coanda surface in both experimental and computational prediction results.

Reduced dust generation when loading hoppers with powdered material. Part 1. Research methods

2021 ◽  
Vol 1 (2) ◽  
pp. 67-72
Author(s):  
A. S. Seminenko ◽  
K. I. Logachev ◽  
A. B. Goltsov ◽  
O. A. Averkova
Keyword(s):  
Research Methods ◽  
Powdered Material ◽  
Dust Generation ◽  
Material Part

Расчетным путем показана целесообразность веерной загрузки бункеров порошкообразным сыпучим материалом. Предложена конструкция кольцевого загрузочного устройства, использующего эффект Коанда, для снижения пылеобразования. Численно и экспериментально определены рациональные конструктивно-технологические параметры разработанного устройства.

Theoretical Approaches Regarding the Gasodynamic Phenomena in Asymmetric Flows

2015 ◽  
Vol 1128 ◽  
pp. 364-371
Author(s):  
Ionică Cîrciu ◽  
Sorin Dinea ◽  
Virgil Geamăn
Keyword(s):  
Experimental Studies ◽  
Coanda Effect ◽  
Related Field ◽  
Current Discussion ◽  
Theoretical Approaches ◽  
Asymmetric Flows ◽  
Coandǎ Effect

Despite the numerous theoretical and experimental studies carried out throughout the years, the use of the Coanda effect in the propulsion-related field definitely remains one of the most current discussion topics since no definite conclusion has been drawn yet regarding the capabilities, applications and performances of the devices based on the Coanda effect. The present paper sets out to present the theoretical quantitative and qualitative aspects of the most important uses of the Coanda phenomenon, including the author’s own interpretations and ideas.

scholarly journals The spreading model of the material in the working chamber of the batch grinder

2019 ◽  
pp. 107-112
Author(s):  
Bratishko, V. ◽  
Rebenko, V. ◽  
Milko, D. ◽  
Khmelovska, A.
Keyword(s):  
Mathematical Model ◽  
Steady State ◽  
Bulk Material ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Surface Shape ◽  
Technological Parameters ◽  
Working Chamber ◽  
General Terms

Purpose. Set the nature of the distribution of bulk material in the working chamber of a batch grinder with a steady state of its operation. Methods. Theoretical principles of classical mechanics, mechanics of liquids and gases. Results. A general mathematical model of the material distribution in the chamber batch grinder is obtained. This model allows determining the height of the material layer at an each point in the working chamber of the batch grinder at a certain distance from the axis rotation of the working bodies and interconnects the physical and mechanical properties of the crushed raw material, technological parameters of the grinder and its mode of operation. The character of the obtained model indicates that it corresponds to the well-established ideas about the distribution of loose media in the working chamber of the batch grinder. Conclusions. As a result of theoretical studies, a mathematical model of the distribution of bulk material in a cylindrical working chamber of a batch grinder with a steady state of operation was obtained in general terms. Assumptions made in the course of research prove the feasibility of conducting experimental studies to verify the adequacy and refinement of the model. Keywords: grinding, bulk material, batch grinder, character of distribution, surface shape.

A possibility of using nickel concentrate, obtained as a result of hydrometallurgical enrichment of manganese-containing raw materials, at steel alloying

2020 ◽  
Vol 76 (7) ◽  
pp. 709-715
Author(s):  
O. Yu. Kichigina
Keyword(s):  
Raw Materials ◽  
Experimental Studies ◽  
Selective Extraction ◽  
Technological Parameters ◽  
Nickel Iron ◽  
Nickel Recovery ◽  
Nickel Concentrate ◽  
Steel Alloying ◽  
High Degree ◽  
Comprehensive Processing

At production of stainless steel expensive alloying elements, containing nickel, are used. To decrease the steel cost, substitution of nickel during steel alloying process by its oxides is an actual task. Results of analysis of thermodynamic and experimental studies of nickel reducing from its oxide presented, as well as methods of nickel oxide obtaining at manganese bearing complex raw materials enrichment and practice of its application during steel alloying. Technology of comprehensive processing of complex manganese-containing raw materials considered, including leaching and selective extraction out of the solution valuable components: manganese, nickel, iron, cobalt and copper. Based on theoretical and experiment studies, a possibility of substitution of metal nickel by concentrates, obtained as a result of hydrometallurgical enrichment, was confirmed. Optimal technological parameters, ensuring high degree of nickel recovery out of the initial raw materials were determined. It was established, that for direct steel alloying it is reasonable to add into the charge pellets, consisting of nickel concentrate and coke fines, that enables to reach the through nickel recovery at a level of 90%. The proposed method of alloying steel by nickel gives a possibility to decrease considerably steel cost at the expense of application of nickel concentrate, obtained out of tails of hydrometallurgical enrichment of manganese-bearing raw materials, which is much cheaper comparing with the metal nickel.

Flow attachment to solid surfaces: The Coanda effect

AIChE Journal ◽  
1972 ◽  
Vol 18 (1) ◽  
pp. 51-57 ◽  
Author(s):  
T. Panitz ◽  
D. T. Wasan
Keyword(s):  
Solid Surfaces ◽  
Coanda Effect ◽  
Coandǎ Effect
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