Optimizing the structure of a dust concentration measuring device

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.

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

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1057-1064
Author(s):  
Dandan Liu ◽  
Mingming Jing ◽  
Dewen Li ◽  
Chongzhi Liu ◽  
Chunrui Tang
Keyword(s):  
Dust Concentration ◽  
Coanda Effect ◽  
Straight Tube ◽  
Particle Sizes ◽  
Measuring Device ◽  
Electrostatic Induction ◽  
Measurement Devices ◽  
Coandǎ Effect ◽  
Dust Measurement ◽  
Inductive Charge

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.

scholarly journals Remote sensing of aerosols by synergy of caliop and modis

2018 ◽  
Vol 176 ◽  
pp. 08012
Author(s):  
Rei Kudo ◽  
Tomoaki Nishizawa ◽  
Akiko Higurashi ◽  
Eiji Oikawa
Keyword(s):  
Remote Sensing ◽  
Biomass Burning ◽  
Sea Salt ◽  
Water Soluble ◽  
Dust Particles ◽  
Vertical Profiles ◽  
Dust Event ◽  
Carbonaceous Particles ◽  
The Individual ◽  
Better Than

For the monitoring of the global 3-D distribution of aerosol components, we developed the method to retrieve the vertical profiles of water-soluble, light absorbing carbonaceous, dust, and sea salt particles by the synergy of CALIOP and MODIS data. The aerosol product from the synergistic method is expected to be better than the individual products of CALIOP and MODIS. We applied the method to the biomass-burning event in Africa and the dust event in West Asia. The reasonable results were obtained; the much amount of the water-soluble and light absorbing carbonaceous particles were estimated in the biomass-burning event, and the dust particles were estimated in the dust event.

Dust Effect on the Performance of Photovoltaic

2014 ◽  
Vol 875-877 ◽  
pp. 1908-1911 ◽  
Author(s):  
Hussein A. Kazem ◽  
Said Al-Bahri ◽  
Saud Al-Badi ◽  
Haifa Al-Mahkladi ◽  
Ali H. A. Al-Waeli
Keyword(s):  
Experimental Data ◽  
Environmental Parameters ◽  
Red Soil ◽  
Dust Particles ◽  
Dust Effect ◽  
Better Than

Dust represents one of the important environmental parameters that effect photovoltaic (PV) performance. PV performance may be considerably affected when dust particles are deposited on the PV panels. In this paper, the experimental data concerning the effect of three types of dust pollutants (red soil, ash and sand) on the performance of PV panels (mono-c, multi-c and a-Si technologies investigated) have been investigated. It is found that ash have the highest effect in comparison with other pollutants. Also, it is found that a-Si is performing better than mono-c and multi-c in dusty environment.

scholarly journals Device for Contact Measurement of Turbine Blade Geometry in Robotic Grinding Process

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7053
Author(s):  
Dariusz Szybicki ◽  
Andrzej Burghardt ◽  
Krzysztof Kurc ◽  
Piotr Gierlak
Keyword(s):  
Turbine Blade ◽  
Feedback Loop ◽  
Aircraft Engine ◽  
Grinding Process ◽  
Measuring Device ◽  
Robotic Grinding ◽  
Order Of Magnitude ◽  
Accuracy And Repeatability ◽  
Output Interface ◽  
Better Than

The article discusses the design, implementation, and testing of the accuracy of a measuring device used to measure the thickness of aircraft engine blades subjected to a robotic grinding process. The assumptions that the measuring device should meet were presented. The manufactured device was subjected to accuracy and repeatability tests using a standard workpiece. The analysis of research results proved that the measuring device exhibits an accuracy of one order of magnitude better than the accuracy required for blades. For control of the grinding process, the results should be perceived as appropriate. Then, the device was subjected to verification consisting in using it to measure the thickness of aircraft engine blades. The constructed device can be used, not only for inspection of final products, but also for control of the robotic grinding process because thanks to the output interface it can be used in the robotic station’s feedback loop.

scholarly journals Evolution of organic and inorganic components of aerosol during a Saharan dust episode observed in the French Alps

2004 ◽  
Vol 4 (4) ◽  
pp. 3875-3909 ◽  
Author(s):  
G. Aymoz ◽  
J.-L. Jaffrezo ◽  
V. Jacob ◽  
A. Colomb ◽  
Ch. George
Keyword(s):  
Organic Carbon ◽  
Current Knowledge ◽  
Ionic Species ◽  
Saharan Dust ◽  
Dust Particles ◽  
Data Set ◽  
French Alps ◽  
Anthropogenic Origin ◽  
Low Concentrations ◽  
Adsorption Processes

Abstract. A Saharan dust event was observed in a rural area in the Maurienne Valley (French Alps) in summer 2000. Detailed data on PM10, particle numbers, and aerosol chemistry (ionic species and Elemental Carbon (EC) and Organic Carbon (OC)) are presented. The comparative evolutions of particle numbers and chemistry (calcium, sodium, and sulfate) show that the overall period included two episodes of dust particles with very distinct chemistry, followed by an episode with a large increase of the concentrations of species with an anthropogenic origin. The overall data set does not indicate large interactions between the dust particles and compounds from anthropogenic origin (sulfate, nitrate) or with organic carbon, all of these species showing very low concentrations. Simplistic calculations indicate that these concentrations are consistent with our current knowledge of adsorption processes of gases on mineral dust in a clean air mass.

Experimental Study on Absorbing CO2 from Coal-Fired Flue Gas

2012 ◽  
Vol 616-618 ◽  
pp. 1546-1549
Author(s):  
Wei Feng Zhang ◽  
Jian Shao
Keyword(s):  
Experimental Study ◽  
Hollow Fiber ◽  
Flue Gas ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Mixed Solution ◽  
Fiber Membrane ◽  
Absorption Effect ◽  
Low Concentrations ◽  
Better Than

A small hollow-fiber membrane contactor system was used to test the absorption and desorption CO2 using mixed absorption solution of SG/PG and TEA. The results showed that absorption effect of SG was better than PG under low concentrations, but their desorption was the opposite. With the increase of concentration, the absorption effect of SG tended to weak, while the desorption was enhanced. And, PG was contrary. The absorption effect of mixed solution(SG+TEA, PG+TEA) was excellent when adding small amount of TEA. And, the absorption effect of TEA-SG mixed solution was amazing under the low concentration of SG. With the concentration of mixed solution increased, the auxo-action of TEA weakened. Instead, TEA played a active effect on promoting the absorption of TEA+PG mixture with the increasing of concentration. The hybrid experimental results shown that 3mol/L PG+0.1 mol/L TEA mixture absorption solution was best in absorption experiments, and 1mol/L PG+0.2 mol/L TEA mixture absorption solution was best in desorption experiments.

scholarly journals Synthesis of iron oxyhydroxide-coated rice straw (IOC-RS) and its application in arsenic(V) removal from water

2015 ◽  
Vol 13 (3) ◽  
pp. 726-736 ◽  
Author(s):  
Igor W. K. Ouédraogo ◽  
Erol Pehlivan ◽  
Hien T. Tran ◽  
Yvonne L. Bonzi-Coulibaly ◽  
Dieter Zachmann ◽  
...  
Keyword(s):  
Drinking Water ◽  
Rice Straw ◽  
World Health ◽  
Iron Oxyhydroxide ◽  
Thermogravimetric Analyzer ◽  
Low Concentrations ◽  
Equilibrium Data ◽  
Health Organization ◽  
Batch Data ◽  
Better Than

Because of the recognition that arsenic (As) at low concentrations in drinking water causes severe health effects, the technologies of As removal have become increasingly important. In this study, a simplified and effective method was used to immobilize iron oxyhydroxide onto a pretreated naturally occurring rice straw (RS). The modified RS adsorbent was characterized, using scanning electron microscope, Fourier transform infrared spectroscopy, thermogravimetric analyzer, and surface area analyzer. Experimental batch data of As(V) adsorption were modeled by the isotherms and kinetics models. Although all isotherms, the Langmuir model fitted the equilibrium data better than Freundlich and Dubinin–Radushkevich models and confirmed the surface homogeneity of adsorbent. The iron oxyhydroxide-coated rice straw (IOC-RS) was found to be effective for the removal of As(V) with 98.5% sorption efficiency at a concentration of <50 mg/L of As(V) solution, and thus maximum uptake capacity is ∼22 and 20 mg As(V)/g of IOC-RS at pH 4 and 6, respectively. The present study might provide new avenues to achieve the As concentrations required for drinking water recommended by the World Health Organization.

scholarly journals Sorption of surfactants onto sediment at environmentally relevant concentrations: independent-mode as unifying concept

2020 ◽  
Vol 22 (5) ◽  
pp. 1266-1286
Author(s):  
Hildo Krop ◽  
Pim de Voogt ◽  
Christian Eschauzier ◽  
Steven Droge
Keyword(s):  
Dual Mode ◽  
Low Concentrations ◽  
Independent Mode ◽  
Better Than

The Independent-Mode model explains observed sorption phenomena of surfactants at low concentrations (Cs→0, Cw→0) to complex sediments better than the Dual-Mode model.

scholarly journals Assessment of SMA Electrical Resistance Change during Cyclic Stretching with Small Elongation

Sensors ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 6804
Author(s):  
Sebastian Sławski ◽  
Marek Kciuk ◽  
Wojciech Klein
Keyword(s):  
Electrical Resistance ◽  
Niti Alloy ◽  
Martensite Phase ◽  
Test Stand ◽  
Movement Speed ◽  
Resistance Change ◽  
Measuring Device ◽  
Labview Software ◽  
Cyclic Stretching ◽  
Electrical Resistance Change

In this article, changes in NiTi alloy (Flexinol) electrical resistance during cyclic stretching with small elongation were investigated. A dedicated test stand consisting of motorized vertical test stand, force gauge, and electric resistance measuring device with an accuracy of 0.006 Ω was developed. A dedicated control algorithm was developed using LabVIEW software. Changes in electrical resistance were investigated for the 0.1 mm Flexinol wire with length of 120 mm. Testing was performed in the elongation range between 0.25% and 1.5% in martensite phase. Tested samples were subjected to 30 stretching cycles with a movement speed of 10 mm/min. Obtained results show that the cyclic stretching of Flexinol wire reduces its electrical resistance with each stretching cycle. Moreover, it was noted that changes in Flexinol electrical resistance during cycling stretching depend on the assumed elongation and number of the already performed stretching cycles. The observed electrical resistance change decreases with each stretching cycle. Thus, the observed changes are greater during the first stretching cycles. For elongations exceeding 1%, the Flexinol electrical resistance in the first stretching cycle increases. In each subsequent cycle, electrical resistance decreases, as in the case of the smallest value of assumed elongation. In almost all tested cases (except in the case with 1.5% of assumed elongation), Flexinol electrical resistance after 30 stretching cycles was smaller than before the test.

scholarly journals Peculiarities in assessing occupational health risks for workers who are in contact with aerosols containing fine-dispersed dust particles

2020 ◽  
pp. 106-112
Author(s):  
M.F. Vil'k ◽  
◽  
O.S. Sachkova ◽  
L.A. Levanchuk ◽  
E.O. Latynin ◽  
...  
Keyword(s):  
Health Risks ◽  
Chemical Structure ◽  
Dust Particles ◽  
Assessment Methodology ◽  
Health It ◽  
Measuring Device ◽  
A Value ◽  
Research Goal ◽  
And Control ◽  
Risk Assessment Methodology

In Russia there is a system for standardizing and control over aerosols with predominantly fibrogenic effects and dust particles with different structure. But at the same time there are no hygienic standards for fine-dispersed dust contents in working area air and it makes hygienic assessment of working conditions more complicated and impedes use of risk assessment methodology. Our research goal was to substantiate a concentration of aerosols containing fine-dispersed dust particles (РМ10 и РМ2.5) in working are air that were harmless for workers’ health. It was done via applying a procedure for determining dust burden and using it when calculating health risks for workers. We assessed dust content in working area air with focus on fine-dispersed dust particles РМ10 и РМ2.5 with a dust measuring device «OMPN-10.0». Chemical structure of dust particles was determined with atomic absorption procedure. Results were estimated according to HS 2.2.5.3532-18. Dust burden was calculated according to State standard GOST R 54578-2011. We established dependence between duration of working experience under exposure to fine-dispersed dust that was harmless for health and a value of excess in dust contents over the suggested concentration and work shift duration. To assess health risk for workers caused by exposure to fine-dispersed dust particles taking their chemical structure into account, we determined reference concentrations for working area air; 0.1 mg/m3 for РМ10, and 0.055 mg/m3 for РМ2.5. Use of calculated concentrations allowed suggesting models for calculating harmless duration of working experience under exposure to dusts in concentrations higher than recommended ones. The results enable substantiating organizational activities aimed at workers’ health preservation.

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