Optimization of a dust concentration measuring device based on the Coanda effect

The accuracy of the existing dust measurement device comprising a straight pipe is not sufficiently high for low particle speeds. In this paper, a measuring pipe based on the Coanda effect is designed, an experimental model is established using Gambit 2.4, and a numerical simulation is performed using Fluent 6.3. In this way, speed nephograms at the middle section of the device pipe were obtained for different dust particle sizes. By comparing the velocity data of a devices comprising a straight tube, a venturi tube, or a Coanda tube, it was found that the velocity of the particles passing through the Coanda tube was higher than that for the other tubes. Therefore, the probability of frictional collision within the Coanda tube increases, thereby increasing the inductive charge of the particles. By calculating the electrostatic induction of the particles using MATLAB, it was found that the charge carried by the particles in the improved device significantly increased (25% on average). It is concluded that these findings are of significance for designing the structure of novel dust concentration measurement devices.

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Optimizing the structure of a dust concentration measuring device

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209376 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 659-666

Author(s):

Dandan Liu ◽

Wu Ma ◽

Jie Wang ◽

Chongzhi Liu ◽

Chunrui Tang

Keyword(s):

Dust Particles ◽

Movement Speed ◽

Straight Tube ◽

Measuring Device ◽

Side Tube ◽

Electrostatic Induction ◽

Low Concentrations ◽

Center Area ◽

Velocity Cloud ◽

Better Than

The particle movement speed in the pipe of an existing dust measuring device is too small, and the detection in the center area of the pipe is not sufficiently sensitive. According to the intake mode of the cyclone separator, here a new side inlet pipeline is designed that is oriented from the incident mode of the straight pipe. An experimental model was established in Gambit2.4, and the numerical simulation was performed in Fluent6.3. Different dust particle diameters were simulated, and velocity cloud and pressure cloud diagrams of the middle position of the device pipe were obtained. Compared with the velocity data of the straight tube and the side tube, the velocity value of the particle passing through the side tube was better than that of the straight tube. This improved the velocity of the particles and also reduced the settling of the particles. The probability of friction collision of the dust particles in the tube increased, meaning that their induced charge also increased. MATLAB was used to calculate the electrostatic induction, revealing that the charge of the particles in the improved device increased significantly. Therefore, the improved device can effectively improve the measurement accuracy of dust at low concentrations, and for small particle sizes.

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COANDA EFFECT

A-to-Z Guide to Thermodynamics Heat and Mass Transfer and Fluids Engineering ◽

10.1615/atoz.c.coaeff ◽

2006 ◽

Vol c ◽

Author(s):

C. Swan

Keyword(s):

Coanda Effect ◽

Coandǎ Effect

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Laboratory Testing and Numerical Modeling of Coanda-Effect Screens

Building Partnerships ◽

10.1061/40517(2000)72 ◽

2000 ◽

Cited By ~ 4

Author(s):

Tony L. Wahl ◽

Robert F. Einhellig

Keyword(s):

Numerical Modeling ◽

Laboratory Testing ◽

Coanda Effect ◽

Coandǎ Effect

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Flow attachment to solid surfaces: The Coanda effect

AIChE Journal ◽

10.1002/aic.690180111 ◽

1972 ◽

Vol 18 (1) ◽

pp. 51-57 ◽

Cited By ~ 37

Author(s):

T. Panitz ◽

D. T. Wasan

Keyword(s):

Solid Surfaces ◽

Coanda Effect ◽

Coandǎ Effect

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Comparison of CFD simulations and measurements of flow affected by coanda effect

EPJ Web of Conferences ◽

10.1051/epjconf/20122501015 ◽

2012 ◽

Vol 25 ◽

pp. 01015 ◽

Cited By ~ 2

Author(s):

Jan Fišer ◽

Jan Jedelský ◽

Tomáš Vach ◽

Matěj Forman ◽

Miroslav Jícha

Keyword(s):

Coanda Effect ◽

Cfd Simulations ◽

Coandǎ Effect

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Surface Tension Effects on Discharge Capacity of Coanda-Effect Screens

Journal of Hydraulic Engineering ◽

10.1061/(asce)hy.1943-7900.0001902 ◽

2021 ◽

Vol 147 (8) ◽

pp. 04021026

Author(s):

Tony L. Wahl ◽

Christopher C. Shupe ◽

Hajrudin Dzafo ◽

Ejub Dzaferovic

Keyword(s):

Surface Tension ◽

Discharge Capacity ◽

Coanda Effect ◽

Coandǎ Effect

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Theoretical Modeling, Design and Simulation of an Innovative Diverting Valve Based on Coanda Effect

Fluids ◽

10.3390/fluids3040103 ◽

2018 ◽

Vol 3 (4) ◽

pp. 103

Author(s):

Giancarlo Comes ◽

Carlo Cravero

Keyword(s):

Fluid Dynamics ◽

Mathematical Model ◽

Computational Fluid Dynamics ◽

Additive Manufacturing ◽

Water Flow ◽

Coanda Effect ◽

Geometrical Parameters ◽

Convex Wall ◽

Fluidic Device ◽

Coandǎ Effect

The present work is focused on the study of an innovative fluidic device. It consists of a two-ways diverter valve able to elaborate an inlet water flow and divert it through one of the two outlets without moving parts but as a result of a fluctuation of pressure induced by two actuation ports, or channels. Such apparatus is named Attachment Bi-Stable Diverter (ABD) and is able to work with the effect of the fluid adhesion to a convex wall adjacent to it, this phenomenon is known as Coanda Effect; it generates the force responsible for the fluid attachment and the consequent deviation. The main purpose of this work is to develop a knowhow for the design and development of such particular device. A mathematical model for the ABD has been developed and used to find the relationships between the geometrical parameters and the operative conditions. A configuration has been designed, simulated with a computational fluid dynamics approach. A prototype has been printed with and additive manufacturing printer and tested in laboratory to check the effective working point of the device.

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