Numerical simulation and experimental tests of the filter with a rotating cylindrical perforated filter element

2020 ◽  
pp. 095440622095034
Author(s):  
Volodymyr Brazhenko ◽  
Ievgen Mochalin
Keyword(s):  
Numerical Simulation ◽  
Filter Design ◽  
Technical Problem ◽  
Fluid Motion ◽  
Experimental Studies ◽  
Experimental Tests ◽  
Filter Element ◽  
Cleaning Efficiency ◽  
Simulation Results ◽  
Almost All

There is a need to clean various liquids of solid impurities in almost all areas of human activity. The filter design with a rotating cylindrical perforated filter element was proposed to address this topical technical problem. Its work based on the principle of rotational filtration. The experimental studies demonstrated that with a rotating cylindrical perforated filter element could remove more than 90% of the admixture particles. This took place in defined fluid motion modes, which characterized by the dimensionless Reynolds numbers. In the present study, numerical simulation was carried out for an investigation of the hydraulic oil motion and solid admixture particles' motion in the filter. The simulation results showed a local increase velocity in the holes of the perforated filter element. It entails the passage of a very small particle number into the filtrate. A comparison of the numerical simulation results of filter cleaning efficiency with the data of physical experiments showed a rather good agreement, the discrepancy between which is less than 9%.

scholarly journals Numerical simulation of the flow into a circular pipe section

2019 ◽  
Vol 85 ◽  
pp. 02005
Author(s):  
Gelu Muscă ◽  
George Mădălin Chitaru ◽  
Costin Ioan Coşoiu ◽  
Cătalin Nae
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Fluid Motion ◽  
Experimental Tests ◽  
Navier Stokes ◽  
Ansys Fluent ◽  
Turbulent Airflow ◽  
Quantitative Results ◽  
Computational Fluid Dynamics Cfd ◽  
Unsteady Numerical Simulation

Computational Fluid dynamics (CFD) is the science that evolves rapidly in numerical solving of fluid motion equations to produce quantitative results and analyses of phenomena encountered in the fluid flow. When properly used, CFD is often ideal for parameterization studies or physical significance investigations of flow that would otherwise be impossible to replicate through theoretical or experimental tests. The aim of this paper is the study of the turbulent airflow and how the vortices formed in turbulent airflow are influenced by the evolution of the hydraulic characteristics of the fluid flow. Unsteady numerical simulation were performed using Reynolds Average Navier-Stokes (RANS) turbulence model adapted to conventional flow into a pipe with variable section which was implemented in the ANSYS FLUENT expert software.

Torsionsratterschwingungen beim Einsatz überlanger Spiralbohrer*/Torsional chatter in deep hole drilling with extra-long twist drills - Development and cause-effect relationships

2015 ◽  
Vol 105 (01-02) ◽  
pp. 20-28
Author(s):  
E. Abele ◽  
D. Schäfer
Keyword(s):  
Numerical Simulation ◽  
Health Risk ◽  
Experimental Studies ◽  
Acoustic Emissions ◽  
Hole Drilling ◽  
Deep Hole ◽  
Process Dynamics ◽  
Simulation Results ◽  
Twist Drills ◽  
Machine Operator

Zahlreiche Untersuchungen behandeln das Phänomen der regenerativen Torsionsratterschwingungen, die sich aufgrund der erhöhten Prozessdynamik negativ auf Werkzeugstandzeiten auswirken. Zudem stellen die auftretenden Schallemissionen ein Gesundheitsrisiko für den Maschinenbediener dar. Um zu einem besseren Prozessverständnis zu gelangen, wurde ein numerisches Simulationsmodell für den Einsatz überlanger Vollhartmetall-Spiralbohrer entwickelt. Mithilfe des Modells können zahlreiche Einflussfaktoren wie Schnittwerte oder Geometrievariationen des Werkzeugs sowie grundlegende Wirkzusammenhänge untersucht werden. Im Fachartikel werden einige der zur Modellerstellung nötigen experimentellen Untersuchungen und dem Prozessverständnis dienlichen Simulationsergebnisse vorgestellt.   Numerous studies deal with the phenomenon of torsional chatter that adversely affects tool life due to increased process dynamics. In addition, the acoustic emissions occurring represent a health risk for the machine operator. In order to gain a better understanding of the process, a numerical simulation model for the use of extra-long twist drills has been developed. The model can be used for the prediction of the tool behavior or for the investigation of basic cause-effect relationships. In this article some of the experimental studies and simulation results are presented.

Numerical Simulation and Experimental Validation of Frequency Based Fault Detection and Localization in a Planetary Gearbox Under Dynamic Condition

2019 ◽  
Author(s):  
Nithin Venkataram ◽  
Harish K. Bhagavan ◽  
Rahul M. Cadambi ◽  
Arun R. Rao
Keyword(s):  
Numerical Simulation ◽  
Frequency Domain ◽  
Experimental Validation ◽  
Working Condition ◽  
Dynamic Condition ◽  
Experimental Tests ◽  
Test Results ◽  
Planetary Gearbox ◽  
Simulation Results ◽  
Detection And Localization

Abstract The planetary gearbox is often susceptible to faults under dynamic condition. Most of the literature assumes that gearboxes are free from defects. But in real-time working condition these assumptions are not accurate. Therefore the challenge lies in identifying and localizing a fault in planetary gearbox under dynamic condition. In this paper, the focus is on modelling and simulation of a fault in a planetary gearbox and validate the same with experimental tests. A planetary gearbox is modelled as per DIN standard and simulated for time and frequency domain signals. On comparing a fault free and fault induced frequency domain signals, a small peaks are observed on either side of the mesh frequencies, indicating the presence of a fault in the planetary gearbox. These peaks around the mesh frequencies are used to localize the fault in a planetary gearbox. Simulation results are validated with the experimental test results of the planetary gearbox under dynamic conditions. Similar trend is observed in simulation and experimental results.

scholarly journals RESEARCH INTO THE CLEANING EFFICIENCY OF 300 M3/H MAINTAINED BY THE SPIRAL MULTI-CHANNEL CYCLONE IN THE PROCESS OF REMOVING SOLID PARTICLES OF <20 ΜM / 300 M3/H NAŠUMO SPIRALINIO DAUGIAKANALIO CIKLONO VALYMO EFEKTYVUMO TYRIMAS, ŠALINANT < 20 ΜM KIETĄSIAS

2014 ◽  
Vol 6 (4) ◽  
pp. 373-378
Author(s):  
Pranas Baltrėnas ◽  
Diana Platova
Keyword(s):  
Particulate Matter ◽  
Gas Flow ◽  
Experimental Studies ◽  
Flow Distribution ◽  
Experimental Tests ◽  
Solid Particles ◽  
Treatment Efficiency ◽  
Cleaning Efficiency ◽  
Ultrafine Particulate Matter ◽  
Spiral Casing

Tests on the cleaning efficiency of an experimental spiral cyclone have been conducted to determine the removal efficiency of the solid particles the dispersion of which makes &lt;20 µm in the streamlined multi-channel cyclone. The introduced device is adapted to removing ultrafine particulate matter from contaminated air (gas) flow. A multi-channel cyclone with spiral casing has been designed at the Department of Environmental Protection (DEP) of Vilnius Gediminas Technical University. Experimental studies have disclosed that air (gas) flow cleaning efficiency of the spiral multi-cyclone (capacity 300 m3) depend on the internal structure of the device, i.e. on the number of channels and air (gas) flow distribution ratio of transit and peripheral channels. Also, the treatment efficiency of the applied equipment has been evaluated removing solid particles of different nature. AFA-VP-20 filters have been employed for conducting experimental tests. The obtained results have disclosed that solid granite particles – 95.1%, glass – 91.4% and wood – 92.2% are removed most effectively. Eksperimentiniai spiralinio ciklono valymo efektyvumo tyrimai atliekami siekiant nustatyti kietųjų dalelių, kurių dispersija x &lt; 20 μm, pašalinimo efektyvumą patobulintame daugiakanaliame ciklone. Minėtas įrenginys pritaikytas itin smulkioms kietosioms dalelėms iš užteršto oro (dujų) srauto pašalinti. Daugiakanalis ciklonas, turintis spiralinį korpusą, sukurtas Vilniaus Gedimino technikos universiteto (VGTU) Aplinkos apsaugos katedroje (AAK). Eksperimentinių tyrimų metu nustatytas spiralinio daugiakanalio ciklono (našumas 300 m3/h) oro (dujų) srauto valymo efektyvumas priklausomai nuo vidinės įrenginio konstrukcijos, t. y. nuo kanalų skaičiaus ir oro (dujų) srauto pasiskirstymo į tranzitinį ir periferinį kanalus santykio. Taip pat įvertintas įrenginio valymo efektyvumas, šalinant skirtingos prigimties kietąsias daleles. Eksperimentiniams bandymams atlikti naudoti AFA-VP-20 filtrai. Remiantis bandymų rezultatais, nustatyta, kad efektyviausiai šalinamos granito kietosios dalelės – 95,1 %, stiklas – 91,4 %, mediena – 92,2 %.

scholarly journals gauseR: Simple methods for fitting Lotka-Volterra models describing Gause’s “Struggle for Existence”

2020 ◽  
Author(s):  
Lina K. Mühlbauer ◽  
Maximilienne Schulze ◽  
W. Stanley Harpole ◽  
Adam T. Clark
Keyword(s):  
Time Series Data ◽  
Experimental Studies ◽  
Experimental Tests ◽  
Species Interaction ◽  
Series Data ◽  
Past Century ◽  
Ecological Data ◽  
Volterra Models ◽  
Vito Volterra ◽  
Almost All

AbstractThe ecological models of Alfred J. Lotka and Vito Volterra have had an enormous impact on ecology over the past century. Some of the earliest – and clearest – experimental tests of these models were famously conducted by Georgy Gause in the 1930’s. Although well known, the data from these experiments are not widely available, and are often difficult to analyze using standard statistical and computational tools. Here, we introduce the gauseR package, a collection of tools for fitting Lotka-Volterra models to time series data of one or more species. The package includes several methods for parameter estimation and optimization, and includes 42 datasets from Gause’s species interaction experiments and related work. Additionally, we include with this paper a short blog post discussing the historical importance of these data and models, and an R vignette with a walk-through introducing the package methods. The package is available for download at github.com/adamtclark/gauseR. To demonstrate the package, we apply it to several classic experimental studies from Gause, as well as two other well-known datasets on multi-trophic dynamics on Isle Royale, and in spatially structured mite populations. In almost all cases, models fit observations closely, and fitted parameter values make ecological sense. Taken together, we hope that the methods, data, and analyses that we present here provide a simple and user-friendly way to interact with complex ecological data. We are optimistic that these methods will be especially useful to students and educators who are studying ecological dynamics, as well as researchers who would like a fast tool for basic analyses.

Numerical Verification of Constitutive Relationship for Mechanic Behavior of Shape Memory Polymer

2011 ◽  
Vol 121-126 ◽  
pp. 3514-3519
Author(s):  
Bai Lin Zheng ◽  
Xin Ming Huang ◽  
Cong Cong Han ◽  
Qing Yang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Experimental Studies ◽  
Constitutive Relationship ◽  
Numerical Verification ◽  
Strain Relationship ◽  
Viscoelastic Theory ◽  
Simulation Results

Based on the viscoelastic theory, the shape memory behavior of SMP materials is analyzed theoretically with the aid of numerical method of finite element in this paper. The stress-strain relationship depended on temperature and time of SMP materials is described by the thermal viscoelastic integral constitutive model. A numerical simulation is carried out to compare with the experiment conducted by Tobushi (2001[6], 2005[9]), and the simulation results correspond well with the experiment, thus can provide reference to experimental studies

Tubing Cleaning Nozzle Assembly Structure Improvement and Numerical Simulation

2013 ◽  
Vol 457-458 ◽  
pp. 510-513
Author(s):  
Yong Zhang ◽  
Zhi Jiu Ai ◽  
Yan Wu ◽  
Qing Ping Jian ◽  
Yun Da Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Cleaning Efficiency ◽  
Assembly Structure ◽  
Pressure Water ◽  
Structure Improvement ◽  
Simulation Results ◽  
High Pressure Water Jet

The installation position of nozzle directly affect the efficiency of high pressure water jet cleaning. In order to improve the cleaning efficiency, the paper establish the three-dimensional structure and numerical model of the original nozzle assembly and the spiral nozzle assembly. The numerical simulation results show that, on the same boundary conditions, the effective hit range of the spiral nozzle assembly is greater and more uniform than that of the original nozzle assembly.The effective surge pressure of the spiral nozzle assembly is larger than that of the original nozzle assembly, spiral nozzle assembly can can reduce the blind cleaning area and improve the cleaning efficiency.

Design and laboratory verification of a physical model of sloping capillary barrier

2004 ◽  
Vol 41 (5) ◽  
pp. 814-830 ◽  
Author(s):  
Denny Tami ◽  
Harianto Rahardjo ◽  
Eng-Choon Leong ◽  
Delwyn G Fredlund
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Analysis ◽  
Physical Model ◽  
Water Pressure ◽  
Experimental Studies ◽  
Silty Sand ◽  
Capillary Barrier ◽  
Simulation Results ◽  
Barrier Model

A physical model was designed and constructed to study the mechanisms associated with capillary barriers for slope stabilization purposes. Prior to construction of the model, various numerical analyses were conducted to determine the optimum dimensions and appropriate soil types for the materials of the capillary barrier model. This paper is divided into three sections: the first two sections are related to the design of the model and are to obtain the optimum dimensions of the model and to investigate the range of soil properties that are most suitable for experimental studies in the laboratory; and the last section is laboratory verification of the numerical analysis where the numerical simulation results are compared with the experimental data. Based on the numerical simulation results, the physical capillary barrier model was constructed using two different combinations of soils, namely silty sand over gravelly sand and fine sand over gravelly sand. From the comparison of the numerical results and experimental data, it was found that the numerical analysis was able to simulate the experiment on the physical capillary barrier model reasonably well.Key words: physical capillary barrier model, unsaturated water flow, numerical simulation, pore-water pressure, volumetric water content, slope stability, infiltration.

scholarly journals COMPARISON OF EXPERIMENTAL STUDIES AND NUMERICAL MODELING RESULTS OF CONCRETE FILLED TUBULAR ELEMENTS WITH DEMOUNTABLE JOINTS

2018 ◽  
Vol 1 (50) ◽  
pp. 88-96
Author(s):  
P. О. Semko
Keyword(s):  
Numerical Simulation ◽  
Strain State ◽  
Experimental Studies ◽  
Experimental Tests ◽  
Partial Replacement ◽  
Mean Square ◽  
The Finite Element Method ◽  
Principal Stresses ◽  
System A ◽  
The Mean

The article presents the results of experimental tests of compressed tubular elements with demountable joints investigated on the central and noncentral compression (with eccentricities 0, 0,25 and 0.5 from the diameter of the sample) and numerical simulation by the finite element method. The obtained results were compared for similar samples and their models. For which using numerical simulation in the Femap software system a stress-strain state was investigated and graphical representations of principal stresses were presented. For comparison the tensions that arose when the shell's steel pipe was reached the yield strength were selected. The mean square deviation and the coefficient of variation of the data obtained varied in the range of 5 – 7%, which indicates the correspondence of the results and allows further research of partial replacement of experimental tests with numerical simulation

Avalanche Features in Silicon Schottky-FETs in Accordance with Numerical Simulation Results

2006 ◽  
Vol 65 (16) ◽  
pp. 1533-1546
Author(s):  
Yu. Ye. Gordienko ◽  
S. A. Zuev ◽  
V. V. Starostenko ◽  
V. Yu. Tereshchenko ◽  
A. A. Shadrin
Keyword(s):  
Numerical Simulation ◽  
Simulation Results
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