scholarly journals Interaction of Particles and Filter Fabric in Ultrafine Filtration

Eng ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 126-140
Author(s):  
Volker Bächle ◽  
Patrick Morsch ◽  
Bernd Fränkle ◽  
Marco Gleiß ◽  
Hermann Nirschl
Keyword(s):  
Water Resistance ◽  
Fine Particles ◽  
Flow Behavior ◽  
Pure Water ◽  
Particle Interaction ◽  
Hydraulic Load ◽  
Initial Resistance ◽  
Improved Design ◽  
Filter Fabrics ◽  
Filter Fabric

Filter fabrics are frequently used in the separation of particle-laden process streams. Especially for low-concentration and fine particles in the micrometer range, separation on filter fabrics offers considerable advantages over alternative processes. In this process, the inflowing particles are prevented from flowing through the meshes of the fabric. This interaction results in the initial resistance of the filtration not corresponding to the pure water resistance of the filter fabric. Knowledge of this increase in resistance is rare, but it leads to a significant increase in flow resistance, and thus a strong reduction in the hydraulic load on the filter apparatus. Within the scope of this investigation, measurements for 30 filter fabrics and their interaction with 3 particle systems is presented and their effect on the flow behavior is discussed. The knowledge allows an improved design of filter apparatus by correcting the pure water resistance to the resistance with particle interaction and improve the performance of ultra-fine filtration process.

Improvement of Filter-Fabrics for Mining Industry

2021 ◽  
pp. 86-89
Author(s):  
V.A. Rafienko
Keyword(s):  
Competitive Ability ◽  
Mining Industry ◽  
High Technology ◽  
Research Production ◽  
Industrial Enterprises ◽  
Fabric Production ◽  
Filter Fabrics ◽  
Glass Filler ◽  
High Test ◽  
Filter Fabric

The publication represents a review of three major types of filter-fabrics which are actively applied by domestic industrial enterprises. It's specially noted that contemporary high-technological manufacturing is impossible without highquality materials. The domestic technologies on filter-fabric production deserve attention unconditionally. Nevertheless, together with modernization of domestic industrial production, the technologies on filter-fabric accumulation have to change also. Namely that's why the functioning of such enterprises, which lean on competitive ability principles, product quality and its high technology, is utterly important now. In this regard, it represents an interest the activity of research-production enterprise Filter-Fabrics (RPE Filter-Fabrics Ltd) where from 2013, there has been started the manufacturing of innovational products which basis on, polyamide mini-thread and filament (complex) thread from high-test polyamide with glass filler which is stable to abrasion and having lower shrinkage during exploitation in the liquid medium. Besides, RPE Filter-Fabrics Ltd has significantly expanded filter-fabric market by the way of correction of thread basis and weft that has allowed to introduce the production on many concentrating factories.

scholarly journals Rigid Amorphous Fraction as an Indicator for Polymer-Polymer Interactions in Highly Filled Plastics

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3349
Author(s):  
Johannes Benz ◽  
Christian Bonten
Keyword(s):  
Yield Point ◽  
Flow Behavior ◽  
Particle Interaction ◽  
Direct Interaction ◽  
Polymer Particle ◽  
The State ◽  
Rigid Amorphous Fraction ◽  
Amorphous Fraction ◽  
Flow Restriction ◽  
Rigid Amorphous

Above a percolation threshold a flow restriction has to be overcome by higher pressure in plastic processing. Besides amount and geometry of fillers, the interactions of polymer and filler are important. By differing the amorphous phase of polymers into a rigid amorphous and a mobile amorphous fraction, predictions about interactions are possible. The objective is the generation of a flow restriction and the combined investigation of polymer–particle interaction. SiO2 was used up to 50 vol.% in different spherical sizes in PLA and PP. A capillary-rheometer was used as a tool to create a yield point and by that investigations into the state of the flow restriction were possible. All produced compounds showed, in plate-plate rheometry, an increase in viscosity for lower shear rates and a significant change in the storage modulus. In DSC, hardly any specific rigid amorphous fraction was detectable, which suggests that there is a minor interaction between macromolecules and filler. This leads to the conclusion that the change in flow behavior is mainly caused by a direct interaction between the particles, even though they are theoretically too far away from each other. First images in the state of the yield point show a displacement of the particles against each other.

scholarly journals The Interaction of Fine Particles with Stranded Oil

1999 ◽  
Vol 71 (1) ◽  
pp. 83-93 ◽  
Author(s):  
Edward H. Owens
Keyword(s):  
Water Column ◽  
Surface Area ◽  
Fine Particle ◽  
Surf Zone ◽  
Fine Particles ◽  
Particle Interaction ◽  
Tampa Bay ◽  
Solid Surfaces ◽  
Coastal Environments ◽  
Mineral Particles

The interaction of micron-sized mineral particles with stranded oil reduces its adhesion to solid surfaces, such as sediments or bedrock. The net result is the formation of stable, micron-sized, oil droplets that disperse into the water column. In turn, the increase in surface area makes the oil more available for biodegradation. Oil and Fine-particle Interaction ("OFI") can explain how oiled shorelines are cleaned naturally in the absence of wave action in very sheltered coastal environments. Fine-particle interaction can be accelerated during a spill response by relocating the oiled sediments into the surf zone. This has been achieved successfully on two occasions to date: the Tampa Bay response in Florida, and the Sea Empress operation in Wales. Sediment relocation also causes physical abrasion by the hydraulic action of waves so that the processes of fine-particle interaction and surf washing usually occur in combination on open coasts.

Nonuniform distribution of second phase particles in melt-textured Y–Ba–Cu–O oxide with metal oxide (CeO2, SnO2, and ZrO2) addition

1995 ◽  
Vol 10 (7) ◽  
pp. 1605-1610 ◽  
Author(s):  
Chan-Joong Kim ◽  
Ki-Baik Kim ◽  
Gye-Won Hong ◽  
Ho-Yong Lee
Keyword(s):  
Liquid Phase ◽  
Metal Oxide ◽  
Fine Particles ◽  
Particle Interaction ◽  
Phase Region ◽  
Liquid Interface ◽  
Second Phase ◽  
Second Phase Particles ◽  
Solid Liquid Interface ◽  
Solid Liquid

Segregation of second-phase particles within Y1Ba2Cu3O7−y domain was investigated in melt-textured Y-Ba-Cu-O with metal oxide (CeO2, SnO2, and ZrO2) addition. It is found that coarse particles (Y2Ba1Cu1O5) are trapped with a special pattern in the interior of Y1Ba2Cu3O7−y domain, while fine BaCeO3 and BaSnO3 particles are present within the remnant liquid-phase region. During the growth of Y1Ba2Cu3O7−y domain, fine particles appear to be pushed out of the advancing Y1Ba2Cu3O7−y /liquid interface toward the liquid phase. The particle segregation that occurred during peritectic growth of the Y1Ba2Cu3O7−y domain was explained in terms of the Uhlmann-Chalmers-Jackson theory based on the particle interaction at solid/liquid interface.

scholarly journals Water purification experiment by applying flashing method with a rotating nozzle

2020 ◽  
Vol 20 (5) ◽  
pp. 1965-1974
Author(s):  
Hery Sonawan ◽  
Halim Abdurrachim
Keyword(s):  
Dimensional Analysis ◽  
Rotational Speed ◽  
Fine Particles ◽  
Pure Water ◽  
Vacuum Pressure ◽  
Evaporation Process ◽  
Water Production ◽  
Dimensionless Numbers ◽  
Speed Up ◽  
Nozzle Hole

Abstract The flashing process is a way of exposing water in a low-pressure environment by spraying it at high pressure so that the water converts into fine particles. This process is carried out to speed up the evaporation process of water. The evaporation process carried out on freshwater aims to separate the minerals and solids dissolved in water to increase its purity. In this study, the flashing process was carried out through a rotating nozzle that was proven to increase the rate of pure water production. The flashing process experiment is carried out following an experimental design based on the non-dimensional analysis of Buckingham's pi. The rate of pure water production () as the output variable in the flashing process is affected by the nozzle rotational speed (n), nozzle hole diameter (d), feedwater pressure (Pw), vacuum pressure (Pv) and feedwater temperature (T). The feedwater temperature itself can influence the behavior of the feedwater flow in the nozzle, in this case, is density (ρ) and viscosity (μ). Based on these variables, the non-dimensional analysis of Buckingham pi has produced four dimensionless numbers. The generated empirical equations from the flashing process experiments are in the form of quadratic equations. The empirical equation applies to feedwater pressure of 7.6 bar-g, the vacuum pressure of 0.4–0.6 bar-a and nozzle rotational speed of 0–134 rpm. The optimum condensation rate in the flashing experiment was successfully obtained, especially at the nozzle rotation of 27 rpm in all vacuum pressures tested. This success is inseparable from the use of mist-nozzles that convert the feedwater flow into the mist.

scholarly journals Bamboo Particles-Polyvinyl Chloride Composites: Analysis of Particles Size Distribution and Composites Performance

2017 ◽  
Vol 6 (2) ◽  
pp. 1 ◽  
Author(s):  
Shahril Anuar Bahari ◽  
Andreas Krause
Keyword(s):  
Size Distribution ◽  
Polyvinyl Chloride ◽  
Water Resistance ◽  
Fine Particles ◽  
Length Distribution ◽  
Wide Distribution ◽  
High Concentration ◽  
Bambusa Vulgaris ◽  
Particles Size Distribution ◽  
The Impact

Analysis of particles size distribution of Malaysian bamboo species (Bambusa vulgaris and Schizostachyum brachycladum) for polyvinyl chloride (PVC) composites production was conducted using dynamic image analysis (DIA). A wide distribution of bamboo particles length was recorded, varying from almost 0 to 1500-µm for both species. Inadequate amount of actual particles length distribution from each sieve size (75-µm and 1-mm) was also recorded. DIA observed an increase of aspect ratio from small to large particles, and fine particles were recorded to be slightly elongated than the large ones. However, the effects of bamboo particles size on the finished PVC composites performance were uncertain, considerable of numerous other factors that influence the performance. Only impact and water uptake properties of composites have been obviously affected by different particles size. Greater modulus value is observed in composites with high particles loading, though low impact strength and water resistance were recorded. The incorporation of high concentration of selected processing lubricants in the composites formulation helped to improve the impact and water resistance of the composites. Malaysian bamboo particles-PVC composites performance between different species was equivalent, demonstrated that both species displayed identical behaviour for composites production.

Miniature Viscous Disk Pump: Performance Variations From Non-Newtonian Elastic Turbulence

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Phil Ligrani ◽  
Benjamin Lund ◽  
Arshia Fatemi
Keyword(s):  
Pump Power ◽  
Water Solution ◽  
Flow Behavior ◽  
Pure Water ◽  
Pressure Rise ◽  
Volumetric Flow Rate ◽  
Flow Coefficient ◽  
Polyacrylamide Solution ◽  
Water Flows ◽  
Specific Speed

Within the present investigation, a miniature viscous disk pump (VDP) is utilized to characterize and quantify non-Newtonian fluid elastic turbulence effects, relative to Newtonian flow behavior. Such deviations from Newtonian behavior are induced by adding polyacrylamide to purified water. The VDP consists of a 10.16 mm diameter disk that rotates above a C-shaped channel with inner and outer radii of 1.19 mm and 2.38 mm, respectively. A channel depth of 230 μm is employed. Fluid inlet and outlet ports are located at the ends of the C-shaped channel. Experimental data are given for rotational speeds of 126 1/s, 188 1/s, 262 1/s, and 366 1/s, pressure rises as high as 700 Pa, and flow rates up to approximately 0.00000005 m3/s. Reynolds number ranges from 2.9 to 6.5 for the non-Newtonian polyacrylamide solution flows and from 51.6 to 149.8 for the Newtonian pure water flows. To characterize deviations due to non-Newtonian elastic turbulence phenomena, two new parameters are introduced, PrR and HCR, where HCR is the ratio of head coefficient (HC) for the polyacrylamide solution and head coefficient for the water solution, and PrR is the ratio of pump power for the polyacrylamide solution and pump power for the water solution. Relative to Newtonian, pure water flows, the polyacrylamide solution flows give pump head coefficient data, dimensional pressure rise data, slip coefficients (SCs), specific speed (SS) values, and dimensional power data, which show significant variations and differences as they vary with flow coefficient (FC) or dimensional volumetric flow rate. Also important are different ranges of specific speed (SS) for the pure water and polyacrylamide solutions, and a lower range of SC or slip coefficient values for the polyacrylamide solution flows, compared to the pure water flows. These variations are due to increased elastic turbulence losses, which occur as viscosity magnitudes increase and the elastic polymers are excited by mechanical stress, which causes them to extend, deform, stretch, and intertwine.

Study of the Transitional Flow and Particle Separation With a Fishhook Effect in a Mini-Hydrocyclone

2012 ◽  
Author(s):  
Guofeng Zhu ◽  
Jong-Leng Liow ◽  
Andrew Neely
Keyword(s):  
Fine Particles ◽  
Separation Efficiency ◽  
Numerical Study ◽  
Particle Interaction ◽  
Particle Separation ◽  
Transitional Flow ◽  
Lagrangian Model ◽  
Correction Coefficient ◽  
Inlet Velocity ◽  
Les Model

The mini-hydrocyclone is being proposed as a micro-separator in complex micro-devices for in-line fine particle separation as it has a concise geometry and no moving parts,. In this work, we present a numerical study combined by experiments on a 5 mm minihydrocyclone to investigate the transitional flow and particle separation with the presence of a fishhook effect. The results showed that the simulation from the LES model gave good agreement with that from DNS at an inlet velocity of 0.4 m/s. The LES model was then used to study the higher inlet velocity cases of 1.0 and 1.8 m/s. The particle separation was predicted by a Lagrangian model with an added user defined function (UDF) in the Fluent code to account for the particle interaction. The modeling results for the three inlet velocities studied showed that small particle Reynolds number, ReP, resulted in a poorly developed wake behind the large particles, which did not entrain fine particles leading to a barely noticeable fishhook effect for the 0.4 m/s inlet velocity. In contrast, a large ReP gives rise to larger wakes, which are capable of entraining fine particles more efficiently causing the pronounced fishhook effect at higher inlet velocities. The results show the particle separation with the fishhook effect could be modeled based on the particle entrainment model, whereas the accurate simulation of the fishhook effect in future should include a correction coefficient that varies with Rep to improve the separation efficiency predictions.

scholarly journals Thermal Performance of Nanofluid Flow Inside Evacuated Tube Solar Collector

2021 ◽  
Vol 39 (4) ◽  
pp. 1262-1270
Author(s):  
Mohammad H. Yazdi ◽  
Evgeny Solomin ◽  
Ahmad Fudholi ◽  
Ghasem Divandari ◽  
Kamaruzzaman Sopian ◽  
...  
Keyword(s):  
Thermal Efficiency ◽  
Solar Collector ◽  
Volume Fraction ◽  
Flow Behavior ◽  
Pure Water ◽  
Radiant Energy ◽  
Solar Collectors ◽  
Nanofluid Flow ◽  
Ansys Fluent ◽  
Solar Radiation Incident

Solar collectors are systems for absorbing the sun's radiant energy and converting it into heat. The working principle of solar collectors are relying on the solar radiation incident upon the transparent surface, and the collected radiation heat is stored within the operating fluid. However, the conventional operating fluid is less than satisfactory in term of promoting the thermal efficiency of solar collector. Consequently, the aim of this paper is to investigate the use of nanofluid as an operating fluid in a single end evacuated solar collector. The expectation is that the flow behavior of nanofluid can lead to the improvement of thermal efficiency of solar collector. The design of solar collector is carried out using Gambit software and the heat transfer characteristics are simulated by nanofluid flow with 1%, 3% and 5% volumes by ANSYS Fluent software. The results demonstrate good agreement with existing experimental results. The numerical analysis shows the improvement of collector performance compared to pure water fluid. The results show that by increasing the nanoparticles volume fraction the efficiency of the collector improves significantly.

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