scholarly journals An experimental justification of industrial water strainer brush cleaner properties

2021 ◽  
Vol 64 ◽  
pp. 175-187
Author(s):  
D Norenko ◽  
V Kukhar
Keyword(s):  
Experimental Study ◽  
Theoretical Calculation ◽  
Theoretical Calculations ◽  
Frictional Resistance ◽  
Filter Element ◽  
Industrial Water ◽  
Friction Resistance ◽  
Mesh Screen ◽  
Experimental Researches ◽  
Filter Mesh

Purpose. Theoretical calculation of the friction resistance of the brush cleaner on the mesh screen of the strainer filter FRU-190-2 for industrial water. Experimental determination of the stiffness of one bristle of a brush cleaner. Experimental study of the resistance to movement of the brush cleaner on the strainer filter mesh screen. The purpose of writing this article is the theoretical calculation of the friction resistance of the brush cleaner on the strainer filter mesh screen of the industrial water strainer filter. Filters with a mesh screen are used in heavy industry for the first stage of water treatment. To design and calculate the properties of the brush cleaner, it is necessary to determine the geometric characteristics of the brush cleaner and the frictional resistance force when moving the brush cleaner on the strainer filter mesh screen. To confirm the results of the theoretical calculation of the frictional resistance of the brush cleaner, performed by methods of strength of materials, it is necessary to conduct an experimental study to determine the stiffness of one bristle of the brush cleaner and the resistance to movement of the brush cleaner bristles on the filter element. The methodology of research consists in theoretical calculation by methods of strength of materialsof friction resistance of a brush on a surface of a mesh filter element of the FRU-190-2 filter for industrial water, development of a technique of carrying out experiment, confirmation of the received analytical results of theoretical calculations by experimental researches. Findings. To determine the drag force of the brush cleaner, analytical solutions have been developed that take into account the influence of physical and geometric parameters of the bristles. Experimental confirmation of theoretical calculations is obtained. Scientific novelty is to establish and prove the cubic dependence of the force on one wire of the brush cleaner on its deflection. Analytical dependences of calculation of effort of movement of a brush on its geometrical parameters are revealed. Practical implications. The developed design technique and the results of calculations and experimental researches provide an possibility at the design stage to justification the geometric and physical properties of the brush cleaner of the strainer filter of industrial water.

Experimental Study on Side Friction of Uplift Bored Piles in Soft Rock

2013 ◽  
Vol 405-408 ◽  
pp. 248-251 ◽  
Author(s):  
He Song Hu ◽  
Meng Xiong Tang ◽  
Cheng Lin Zhang
Keyword(s):  
Experimental Study ◽  
Soft Rock ◽  
Frictional Resistance ◽  
Engineering Practice ◽  
Geotechnical Investigation ◽  
Silty Mudstone ◽  
Friction Resistance ◽  
Bored Piles ◽  
Side Friction ◽  
Investigation Report

Based on the experiment of frictional resistance between concrete short pile and lightly weathered silty mudstone, the frictional resistance of concrete short pile on uplift loading was analyzed and the ultimate friction resistance was obtained. Considering the site geotechnical investigation report and relative standards, the safety factor of side friction of uplift bored piles in soft rock was defined according to the testing of frictional resistance between concrete short pile and lightly weathered silty mudstone. Achievements in this research are already applied into engineering practice.

Methods of theoretical calculations and of experimental researches of the system atomic hydrogen – metal

2021 ◽  
Author(s):  
Al.D. Zolotarenko ◽  
An.D. Zolotarenko ◽  
A. Veziroglu ◽  
T.N. Veziroglu ◽  
N.A. Shvachko ◽  
...  
Keyword(s):  
Atomic Hydrogen ◽  
Theoretical Calculations ◽  
Experimental Researches

scholarly journals EFICIÊNCIA DE DIFERENTES ELEMENTOS FILTRANTES NA PREVENÇÃO DE OBSTRUÇÃO DE GOTEJADORES

Irriga ◽  
2003 ◽  
Vol 8 (1) ◽  
pp. 78-87 ◽  
Author(s):  
José Euclides Stipp Paterniani ◽  
Marcos Eduardo Scatolini
Keyword(s):  
Irrigation Water ◽  
Suspended Solid ◽  
Filter Element ◽  
Solid Concentration ◽  
Algae Removal ◽  
Mesh Screen ◽  
Suspended Solid Concentration ◽  
E Mail ◽  
Synthetic Fabric ◽  
Continuous Average

EFICIÊNCIA DE DIFERENTES ELEMENTOS FILTRANTES NA PREVENÇÃO DE OBSTRUÇÃO DE GOTEJADORES   José Euclides Stipp Paterniani Marcos Eduardo ScatoliniFaculdade de Engenharia Agrícola, Universidade Estadual de Campinas, Campinas, SP. CP 6011, CEP 13083-970, E-mail: [email protected]   1 RESUMO  Durante ensaios para verificação de eficiência de retenção de algas em filtros de discos 120 MESH, tela 120 MESH e manta sintética não tecida, foram avaliados o grau de obstrução de gotejadores de labirinto com fluxo turbulento e vazão nominal de 4 L.h-1 e 8 L.h-1. Para determinação da obstrução causada por impurezas não retidas no meio filtrante foram avaliadas a evolução da vazão e da uniformidade estatística dos gotejadores submetidos aos diferentes meios filtrantes durante um período de 22 semanas durante 4 horas diárias e comparadas com uma parcela testemunha sem elemento filtrante. Os resultados mostraram que houve diferença significativa entre o elemento de discos, que apresentou maior uniformidade estatística, os filtros de manta e tela com valores intermediários e a testemunha que apresentou menor uniformidade estatística. No entanto, para caracterizar de maneira definida a diferença no desempenho dos elementos filtrantes, estes valores deveriam vir acompanhados de uma redução contínua na vazão média dos tratamentos, o que foi observado apenas para o elemento de tela com o gotejador de 4 L.h-1. As demais variações da uniformidade estatística foram temporais, provavelmente devido a obstruções  temporárias ocasionadas por variações da concentração de sólidos suspensos na água de irrigação.  UNITERMOS: Filtragem, Gotejamento, Qualidade da água.   PATERNIANI, J.E.S.; SCATOLINI, M.E. EFFICIENCY OF DIFFERENT FILTER ELEMENTS TO PREVENT TRICKLE CLOGGING   2 ABSTRACT  This work aimed to verify the efficiency of algae removal in disks 120 mesh, screen 120  mesh, and non woven synthetic fabric filters. It was evaluated the degree of clogging of turbulent flow drippers on 4 L.h-1 and 8 L.h-1 outflow. For blockage determination the outflow evolution  and statistics uniformity (Us) of the dripper have been evaluated when submitted to different filter media over 22 weeks, 4 daily hours compared to a control without the filter element. The results indicated significant differences among the elements. The disk element presented greater statistic uniformity. The screen filter and the non woven synthetic fabric element presented intermediate values whereas the parcel with no filter element (control) presented minor statistic uniformity. However, in order to characterize performance differences among them, values should be presented along with a  continuous average outflow reduction in all treatments. This pattern was observed only for the screen filter and 4 L.h-1 drippers. The statistics uniformity variation has been probably caused by temporary blockages due to variation in suspended solid concentration in irrigation water.  KEYWORDS: filtration, drip irrigation, water quality. 

scholarly journals PENGARUH DIAMETER TIANG TERHADAP TAHANAN GESEK TIANG DALAM TANAH LEMPUNG

2019 ◽  
Vol 1 (3) ◽  
pp. 219-224
Author(s):  
Andikanoza Pradiptiya ◽  
A’isyah Salimah
Keyword(s):  
Pile Foundation ◽  
Structural Damage ◽  
Tensile Load ◽  
Frictional Resistance ◽  
Test Method ◽  
Scale Model ◽  
Friction Resistance ◽  
Average Value ◽  
Constant Rate ◽  
Pile Model

AbstractSome buildings impose limits on the foundation displacement that occur with relatively small values so as not to cause structural damage. The test method used was to make a model test box as a testing medium by simulating the actual model into the form of a scale model. The study was conducted using a single pile foundation with reduced scale, made of concrete with a diameter of 0.02 m, 0.03 m, 0.04 m and the length of each pile was 0.4 m. The pile model was mounted by pressing into the clay that had been compacted in the test box and then given a tensile load which refers to ASTM D3689-07 procedure E (Constant Rate of Uplift Test). Mobilization of pile friction resistance at critical displacement determined the frictional resistance of the ultimate pile units. The test results showed that the greater the diameter of the pile, the frictional resistance of the ultimate pile units would increase. The increase in frictional resistance of the ultimate pile units showed an average value of around 17.1%.Keywords : Pile foundation, Pile diameter, Friction resistance.AbstrakMeningkatnya pembangunan hunian mengakibatkan naiknya permintaan akan batako, hal ini tentunya Beberapa konstruksi bangunan memberikan batasan kepada perpindahan tiang yang terjadi dengan nilai yang relatif kecil supaya tidak menyebabkan kerusakan struktur. Metode uji yang dipakai adalah membuat box uji model sebagai media pengujian, dengan mensimulasikan model yang sebenarnya ke dalam bentuk model skala. Penelitian dilakukan menggunakan model pondasi tiang tunggal penampang lingkaran lingkaran skala tereduksi yang terbuat dari beton dengan diameter 0,02 m, 0,03 m, 0,04 m dan panjang  masing-masing tiang adalah 0,4 m. Model tiang dipasang dengan cara ditekan pada tanah lempung yang sudah dipadatkan dalam box uji kemudian diberikan beban tarik yang mengacu pada ASTM D3689-07 prosedur E (Constant Rate of Uplift Test). Mobilisasi tahanan gesek tiang pada perpindahan tiang kritis menetukan tahanan gesek satuan ultimit. Hasil uji memperlihatkan bahwa semakin besar diameter tiang, tahanan gesek satuan ultimit tiang akan bertambah. Peningkatan tahanan gesek satuan ultimit tiang menunjukkan rata-rata sekitar 17,1 %.Kata kunci : Pondasi Tiang, Diameter Tiang, Tahanan Gesek Tiang.

scholarly journals I. On certain dimensional properties of matter in the gaseous state. Part I. Experimental researches on thermal transpiration of gases through porous plates, and on the laws of transpiration and impulsion, including an experimental proof that gas is not a continuous plenum. Part II. On an extension of the dynamical theory of gas which includes the stresses, tangential and normal, caused by a varying condition of the gas, and affords an explanation of the phenomena of transpiration and impulsion

1879 ◽  
Vol 28 (190-195) ◽  
pp. 303-321 ◽  
Keyword(s):  
Experimental Study ◽  
Dynamical Theory ◽  
Molecular Theory ◽  
Thin Plates ◽  
Capillary Tubes ◽  
Experimental Proof ◽  
Gaseous State ◽  
Dimensional Properties ◽  
The Subject ◽  
Experimental Researches

1. The motion of gases through minute channels such as capillary tubes, porous plugs, and apertures in thin plates has been the subject of much attention during the last fifty years. The experimental study of these motions, principally by Graham, resulted in the discovery of important properties of gases, and it is largely, if not mainly, as affording an explanation of these properties, that the molecular theory has obtained such general credence.

An Experimental Study of the Viscous Resistance of a 0,564-CB Form

1979 ◽  
Vol 23 (02) ◽  
pp. 140-156
Author(s):  
P. N. Joubert ◽  
P. H. Hoffmann
Keyword(s):  
Experimental Study ◽  
Reynolds Number ◽  
Skin Friction ◽  
Resistance Coefficient ◽  
Viscous Resistance ◽  
Local Skin ◽  
Friction Resistance ◽  
Local Skin Friction ◽  
The University ◽  
Resistance Coefficients

Wind tunnel tests were performed to determine the viscous resistance and its components for a 0.564-CB model from the BSRA Trawler Series. It was found that the sum of the pressure and skin friction resistance coefficients agreed well with the viscous resistance coefficient determined from drag balance tests. The range of Reynolds number examined was from 1.15 × 106 to 5.17 × 106. The results for the viscous resistance and its components were fitted using least-squares methods to various equations. The results were also compared with the results of previous tests done at the University of Melbourne on models of Lucy Ash-. ton and a 0.80-CB tanker. It was found that the skin friction and viscous resistance coefficients had curves of quite different position and slope. Local skin friction distribution showed noteworthy differences, especially at the stern, with high values at the keel and low values approaching the waterline.

Model for the Suspensions Separation Process in Hydrodynamic Filters with a Rotating Filter Element

2021 ◽  
pp. 48-56
Author(s):  
Vladimir Devisilov ◽  
V. Lvov ◽  
E. Sharay
Keyword(s):  
Theoretical Calculation ◽  
Statistical Method ◽  
Separation Process ◽  
Filter Element ◽  
Kolmogorov Equation ◽  
Diffusion Type ◽  
Self Cleaning ◽  
Fokker Planck

The possibility of applying the probabilistic-statistical method for theoretical calculation of characteristics related to suspensions separation in self-cleaning hydrodynamic filters with a rotating filter element has been demonstrated. It has been shown that the change in characteristics of the suspensions separation in hydrodynamic filters with a rotating filter element can be satisfactorily described based on equations of diffusion type, in particular, using the Fokker–Planck–Kolmogorov equation. The main parameters of the separation process in hydrodynamic filters with a rotating filter element have been determined.

A Modified Chezy Formula for One-Dimensional Unsteady Frictional Resistance in Open Channel Flow

2021 ◽  
Vol 143 (5) ◽  
Author(s):  
Junwei Zhou ◽  
Weimin Bao ◽  
Geoffrey R. Tick ◽  
Hamed Moftakhari ◽  
Yu Li ◽  
...  
Keyword(s):  
Unsteady Flow ◽  
Frictional Resistance ◽  
Mitigation Strategies ◽  
Flood Routing ◽  
Flood Events ◽  
Complex Flow ◽  
Cross Sectional ◽  
Friction Resistance ◽  
Flow Unsteadiness ◽  
Better Than

Abstract It has been observed in literature that for unsteady flow conditions the one-to-one relationships between flow depth, cross-sectional averaged velocity, and frictional resistance as determined from steady uniform flow cases may not be appropriate for these more complex flow systems. Thus, a general friction resistance formula needs to be modified through the addition of new descriptive terms to account for flow unsteadiness, in order to eliminate errors due to uniform and steady-flow assumptions. An extended Chezy formula incorporating both time and space partial derivatives of hydraulic parameters was developed using dimensional analysis to investigate the relationship between flow unsteadiness and friction resistance. Results show that the proposed formula performs better than the traditional Chezy formula for simulating real hydrograph cases whereby both formula coefficients are individually identified for each flood event and coefficients are predetermined using other flood events as calibration cases. Although the extended Chezy formula as well as the original Chezy formula perform worse with the increasing degree of flow unsteadiness, its results are less dramatically affected by unsteadiness intensity, thereby improving estimations of flood routing. As a result, it tends to perform much better than traditional Chezy formula for severe flood events. Under more complex conditions whereby peak flooding events may occur predominantly under unsteady flow, the extended Chezy model may provide as a valuable tool for researchers, practitioners, and water managers for assessing and predicting impacts for flooding and for the development of more appropriate mitigation strategies and more accurate risk assessments.

scholarly journals Analysis of trimaran-pentamaran side hull location based on clearance and staggers with stern form variations

2018 ◽  
Vol 67 ◽  
pp. 04003
Author(s):  
Yanuar ◽  
Wiwin Sulistyawati ◽  
R. Joshua Yones ◽  
Samodero Mahardika
Keyword(s):  
Surface Area ◽  
Optimum Design ◽  
High Speed ◽  
Frictional Resistance ◽  
Experimental Tests ◽  
Hull Form ◽  
Negative Interference ◽  
Friction Resistance ◽  
Resistance Reduction ◽  
Wetted Surface Area

An optimum design of ship is to achieve the required speed with minimum power requirements. On multihull, sidehull position against to mainhull influences the friction resistance and its stability. Frictional resistance of multi-hull increases due to the addition of wetted surface area of hull, but wave making resistance can be lowered by a slender hull form. This research are experimental tests of trimaran with five Wigley hulls on a combination transom and without transom. The test varied on stagger, clearance and trim at several speeds. A ship with formation arrow tri-hull on forward was given to prove the resistance reduction due to cancellation wave which was indicated by negative interference. The influence diverse position of sidehull has shown that model non-transom (NT) stern moreover give beneficial resistance than model with transom (WT) at high speed. Similarly, in the trim conditions that NT more favorable on trim specifically for high speed depending on the position of the sidehull to the mainhull.

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