scholarly journals Filtration Performance Characteristics of Sticky Aerosol Using Calcium Hydroxide

Atmosphere ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 100
Author(s):  
Jae-Rang Lee ◽  
Naim Hasolli ◽  
Seong-Min Jeon ◽  
Kang-San Lee ◽  
Jun-Hyeok Gang ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Flow Rate ◽  
Collection Efficiency ◽  
Residual Pressure ◽  
Filter Performance ◽  
Paint Spray ◽  
Experimental Apparatus ◽  
Filtration Area ◽  
High Level ◽  
Residual Pressure Drop

This study examined the performance of removing aerosol upon a flow rate variable by agglomerating sticky aerosol with calcium hydroxide and removing cohesive aerosol through an experimental apparatus, simulating an actual painting booth. As a result of examining the performance of the filter by fixing the paint spray quantity, the calcium hydroxide input and the filtration area under variable flow rates of 5, 10, and 15 Nm3/min, we confirmed that the filter performance has long average aerosol removing intervals at the 5 Nm3/min flow rate. At the 5 Nm3/min flow rate, there is a low residual pressure drop trend and high fractional collection efficiency, and a high level of total collection efficiency is maintained at 99.42%. When the flow rate is less than 5 Nm3/min, the aerosol settling and experimentation was impossible. With this research, the optimal conditions for the use of sticky aerosol have been examined.

scholarly journals Integrated Magnetohydrodynamic Pump with Magnetic Composite Substrate and Laser-Induced Graphene Electrodes

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1113
Author(s):  
Mohammed Asadullah Khan ◽  
Jürgen Kosel
Keyword(s):  
Magnetic Flux ◽  
Flow Rate ◽  
Magnetic Composite ◽  
Propulsive Force ◽  
Closed Channel ◽  
Lab On Chip ◽  
Composite Substrate ◽  
On Chip ◽  
High Level ◽  
Moving Parts

An integrated polymer-based magnetohydrodynamic (MHD) pump that can actuate saline fluids in closed-channel devices is presented. MHD pumps are attractive for lab-on-chip applications, due to their ability to provide high propulsive force without any moving parts. Unlike other MHD devices, a high level of integration is demonstrated by incorporating both laser-induced graphene (LIG) electrodes as well as a NdFeB magnetic-flux source in the NdFeB-polydimethylsiloxane permanent magnetic composite substrate. The effects of transferring the LIG film from polyimide to the magnetic composite substrate were studied. Operation of the integrated magneto hydrodynamic pump without disruptive bubbles was achieved. In the studied case, the pump produces a flow rate of 28.1 µL/min. while consuming ~1 mW power.

scholarly journals Influence of Particle and Grain Size on Sand Filtration: Effect on Head Loss and Turbidity

2020 ◽  
Vol 8 (2) ◽  
pp. 36
Author(s):  
Racha Medjda Bouchenak Khelladi ◽  
Abdelghani Chiboub Fellah ◽  
Maxime Pontié ◽  
Fatima Zohra Guellil
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Granular Media ◽  
Particle Concentration ◽  
Head Loss ◽  
Sand Filtration ◽  
Circular Column ◽  
Filter Performance ◽  
Filter Operation ◽  
Suspended Matters

Sand filtration is an eco-friendly method to treat either drinking water or wastewater ; it requires only natural granular media. It is also easy to use and to maintain ; the only problem they face is clogging that affects filter performance, that can be detected when head loss or turbidity increase. The purpose of this work is to see what are the factors that influence the performance of filter operation, for this, we used a pilot consisting on a circular column filled with sand (from South Algeria), where various parameters were tested; pressure, flow rate, sand granulometry, suspended matters and particle concentration of the water which is filtered. After eighteen weeks of operation, we have found that head loss increases by decreasing granulometry and increasing flow rate, pressure, particle size, and concentration. However, turbidity increases by decreasing particle size and increasing granulometry and particle concentration. Turbidity and head loss have different behaviour towards the same parameter; that is why it is necessary to take them into account in order to find a compromise between acceptable head loss / turbidity for a good functioning of the filter.

Vertical Mixed Jet Behavior of Orifice Nozzle

2014 ◽  
Vol 1070-1072 ◽  
pp. 1978-1981
Author(s):  
Lu Peng ◽  
Dong Jun Kim ◽  
Hei Cheon Yang
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Water Tank ◽  
Entrainment Ratio ◽  
Penetration Length ◽  
Air Compressor ◽  
Primary Fluid ◽  
Experimental Apparatus ◽  
Jet Behavior ◽  
Transfer Behavior

The objective of this study is to experimentally investigate the mixed jet and oxygen transfer behavior of a vertical orifice nozzle. The experimental apparatus consisted of an electric motor-pump, an orifice nozzle, a circulation water tank, an air compressor, a high speed camera unit and controlling or measuring accessories. The entrainment ratio was calculated using the measured primary fluid flow rate and suction air flow rate with primary flow pressure. The visualization image of vertically injected air and mixed jet issuing from the orifice nozzle was analyzed qualitatively. As the air compressor pressure increases, the penetration length of mixed jet decreases and the mass ratio and dissolved oxygen concentration increase.

scholarly journals Experimental study on the performance of flat air collector with reticulated endothermic body

2020 ◽  
Vol 165 ◽  
pp. 01025
Author(s):  
Liang Hong ◽  
Han Zhiguo ◽  
Wang Jing ◽  
Duli Kunjiang ◽  
Li Zhiyong
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Temperature Difference ◽  
Collection Efficiency ◽  
Air Flow ◽  
Wire Mesh ◽  
Pore Density ◽  
Air Flow Rate ◽  
Flow Temperature ◽  
Mesh Density

Because the flat air collector is simple in structure, reliable in operation, and resistant to cold and frost, it is more suitable for applications such as building heating. This paper presents a flat air collector with a mesh heat sink, and analyzes the effects of air flow, temperature difference between inlet and outlet, and wire mesh density on the heat collection efficiency of the collector. The results show that when the pore density is fixed, the heat collection efficiency increases with the increase of air flow rate, which is 10% higher than that of natural convection when the air flow rate is maximum; when the air flow rate is fixed, the heat collection efficiency increases with the increase of the pore density and the temperature difference between the inlet and outlet, which can be increased by 10% -20%.

Evaluation of sealing ability, pH and flow rate of three calcium hydroxide-based sealers

1995 ◽  
Vol 11 (5) ◽  
pp. 225-228 ◽  
Author(s):  
J. F. Siqueira ◽  
R. C. Fraga ◽  
P. F. Garcia
Keyword(s):  
Calcium Hydroxide ◽  
Flow Rate ◽  
Sealing Ability

Proposal of a New Ultrasonic Welding Technique for Thermoplastic Polymer

2009 ◽  
Vol 83-86 ◽  
pp. 1129-1134 ◽  
Author(s):  
Yong Bo Wu ◽  
Takashi Sato ◽  
Jian Hui Qiu ◽  
Wei Min Lin
Keyword(s):  
Tensile Strength ◽  
Ultrasonic Vibration ◽  
Normal Pressure ◽  
Ultrasonic Welding ◽  
Frictional Heat ◽  
Experimental Apparatus ◽  
High Level ◽  
Plastic Parts ◽  
Welding Pressure ◽  
Welding Technique

This paper proposes an alternative ultrasonic welding technique capable of welding plastic parts with different shapes and sizes. In this method, a thin plastic sheet of less than 0.5 mm in thickness is fixed to the ultrasonic vibration body called the horn, and two plastic workpieces to be welded are pressed upon the sheet from both sides at a constant normal pressure. Once the horn starts to ultrasonically vibrate, frictional heat is momentarily generated between the sheet and the plastic workpieces, increasing the frictional temperature to a high level. When the temperature increases to over the melting point of all the materials, the materials melt and eventually are welded after the ultrasonic vibration stops. In the current work, an experimental apparatus was designed and constructed. A series of experiments was subsequently carried out on the apparatus to investigate how the surface roughness of the workpieces, the welding time, and the normal welding pressure affect the actual welding area and the tensile strength of the welded workpieces. The experimental results showed that a bigger welding area and a higher tensile strength can be obtained under the appropriate welding conditions, providing validation of the new welding method.

OPTIMIZATION OF DISPERSANT APPLICATION, ESPECIALLY BY SHIP

1989 ◽  
Vol 1989 (1) ◽  
pp. 337-342
Author(s):  
François Merlin ◽  
Christian Bocard ◽  
Gilles Castaing
Keyword(s):  
Flow Rate ◽  
Laboratory Tests ◽  
State Of The Art ◽  
Sea Surface ◽  
Key Factors ◽  
Treatment Procedure ◽  
Low Efficiency ◽  
High Level ◽  
Meso Scale ◽  
Oil Thickness

ABSTRACT A lot of information has been made available for 10 years on the use of dispersants through offshore and meso-scale trials. A state-of-the-art review shows that among the key factors that have been identified, the contact between dispersant and oil is of utmost importance. A better knowledge of this parameter should be taken into account in defining operational procedures, especially when applying dispersants by ship, which is considered to be complementary to aerial spraying. Upon request of the French Navy, a series of meso-scale trials was carried out off Brittany in June 1987, according to the methodology previously used in 1984. Three dispersants were sprayed from a boat. It was concluded that a high level of energy at the sea surface mitigates discrepancies in dispersants’ efficiencies as measured in laboratory tests. Better results were obtained in the case of relatively thick oil slicks. The low efficiency that was measured when treating downwind was attributed to the already-observed herding effect. These complementary results reinforce the actions that have been recently developed to optimize dispersant application by ship:Shipboard equipment for neat dispersant spraying is described. Its main feature is an original nozzle assembly that allows the dispersant to be applied effectively onto the oil at a flow rate that can be widely and very quickly changed according to the estimated oil thickness.An operational treatment procedure is discussed, showing how to map, mark out, prospect and treat oil slicks according to the slick shape, estimated oil thickness, and wind direction.

Removal and Containment of High-Level Radioactive Polonium From Liquid Lead-Bismuth Coolant

1997 ◽  
Vol 506 ◽  
Author(s):  
E.I. Yefimov ◽  
D.V. Pankratov ◽  
S.V. Ignatiev
Keyword(s):  
High Energy ◽  
Liquid Lead ◽  
Alkaline Extraction ◽  
Vacuum Sublimation ◽  
Safety Standards ◽  
Experimental Apparatus ◽  
The Us ◽  
High Level ◽  
Secondary Neutrons ◽  
Spallation Product

ABSTRACTThe channels of polonium nuclide formation in lead-bismuth target irradiated by high energy protons and secondary neutrons are considered. Under off blanket condition the activity of 200po -210Po, as well as the fission and spallation product activity are calculated for 15 MW target after 1 year operation. Polonium separation methods, including removal using alkaline extraction, vacuum sublimation, and so-called carrier method are analyzed. The engineering design for experimental apparatus to test polonium removal and containment using alkaline extraction using tellurium as a chemical analog of polonium is developed. The necessary degree of polonium removal to keep concentration below levels appropriate to meet the US and Russia safety standards is estimated. Comparative analysis of alkaline extraction and vacuum sublimation techniques from the viewpoint to achieve the necessary removal depth is carried out.

scholarly journals Numerical Study on Air Egress Velocity of Ancillary Room Pressurization Systems in Apartment Fires

2020 ◽  
Vol 34 (4) ◽  
pp. 78-86
Author(s):  
Byeongjun Kim ◽  
Ying Yan ◽  
Weon Gyu Shin
Keyword(s):  
Flow Rate ◽  
Fire Safety ◽  
Numerical Study ◽  
Soot Concentration ◽  
Apartment House ◽  
Safety Standards ◽  
Air Supply ◽  
High Level ◽  
The Relationship ◽  
Fire Door

In this study, numerical simulations were performed on the air egress velocity of pressurization systems in an ancillary room when a fire occurred in an apartment house. The relationship between the air supply flow rate of a damper and air egress velocity at a fire door is predicted to be linear. Additionally, a minimum flow rate of the damper, which meets national fire safety standards for air egress velocity, i.e., 0.7 m/s can be estimated. Air egress velocity at the fire door is analyzed according to the supply air direction and installation height of the damper. When the damper has an upward supply air direction and is installed at a high level, the egress velocity at the top section of the fire door is larger, whereas the soot concentration at the ancillary room is lower than when the supply direction of the damper is downward. Therefore, it is found that increasing the air egress velocity at the top section of the fire door helps to efficiently prevent the inflow of smoke.

scholarly journals PRECISE INDOOR LOCALIZATION FOR MOBILE LASER SCANNER

2015 ◽  
Vol XL-4/W5 ◽  
pp. 1-6 ◽  
Author(s):  
R. Kaijaluoto ◽  
A. Hyyppä
Keyword(s):  
Data Collection ◽  
Point Cloud ◽  
Indoor Localization ◽  
Collection Efficiency ◽  
Laser Scanner ◽  
Functional Method ◽  
Single View ◽  
Laser Scanners ◽  
Point Data ◽  
High Level

Accurate 3D data is of high importance for indoor modeling for various applications in construction, engineering and cultural heritage documentation. For the lack of GNSS signals hampers use of kinematic platforms indoors, TLS is currently the most accurate and precise method for collecting such a data. Due to its static single view point data collection, excessive time and data redundancy are needed for integrity and coverage of data. However, localization methods with affordable scanners are used for solving mobile platform pose problem. The aim of this study was to investigate what level of trajectory accuracies can be achieved with high quality sensors and freely available state of the art planar SLAM algorithms, and how well this trajectory translates to a point cloud collected with a secondary scanner. <br><br> In this study high precision laser scanners were used with a novel way to combine the strengths of two SLAM algorithms into functional method for precise localization. We collected five datasets using Slammer platform with two laser scanners, and processed them with altogether 20 different parameter sets. The results were validated against TLS reference. The results show increasing scan frequency improves the trajectory, reaching 20 mm RMSE levels for the best performing parameter sets. Further analysis of the 3D point cloud showed good agreement with TLS reference with 17 mm positional RMSE. With precision scanners the obtained point cloud allows for high level of detail data for indoor modeling with accuracies close to TLS at best with vastly improved data collection efficiency.

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