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Hydraulic gradient prediction for solid-water mixture flow through horizontal pipelines of different diameters and roughness and solids concentrations

100%

Osra F. A.

Journal of Water and Land Development

2021

tom no. 49

267--272

In wastewater treatment plants, large pumps are often used to accommodate unknown hydraulic properties of solid-water mixture flow. The use of large pumps translates into higher purchasing and operating costs. Wastewater mixture is pumped with solids of different types and concentrations through pipelines. The design of these ducts is mainly based on the hydraulic laws of solid-water mixture which is represented by a corrected friction coefficient corresponding to the concentration of solids in water. This paper experimentally studies hydraulic properties of solid-water mixtures in pipelines by the varying Froude number (Fr), which represents the velocity mixture, solid concentration, pipeline diameter and pipeline material type-roughness coefficient. The experiments have been conducted in the wastewater treatment plant where six solid concentrations can be found ranging from 2 to 12% by weight. The pipe diameter ranges between 100 to 300 mm. It has been found that both the friction coefficient and the hydraulic gradient ameliorate with the increase of the pipeline roughness and the solids concentration in the water mixture, whereas the Fr drop with the diameter of the pipeline. The results are translated into curves and equations to predict the corrected pipeline friction coefficient and the hydraulic gradient of the solid-water mixture flow through horizontal pipelines at various solids concentrations, roughness and diameters.

Nonlinear water flow characteristics describing organic soil consolidation

84%

Malinowska E. , Sas W. , Szymanski A.

Electronic Journal of Polish Agricultural Universities. Series Civil Engineering

2007

tom 10

nr 4

Problematyka badań współczynnika filtracji w aparacie trójosiowego ściskania

84%

Kaczmarek Ł. , Dąbska A. , Popielski P.

Przegląd Geologiczny

2022

tom Vol. 70, nr 5

417--423

Laboratory tests, which enable determination of the permeability properties of soil, are distinguished by the accuracy and relatively shorttesttime. Moreover, laboratory methods using a triaxial compression apparatus expand capability for tests with a different filtration regime and a spatial stress state applied on the analysed material. Such flexibility of research procedures allows for a number of scientific and engineering applications. The article outlines the construction of the triaxial apparatus system dedicated to filtration tests, their procedure, and important interpretation aspects.

Krótki przegląd badań współczynnika filtracji gruntów

84%

Popielski P. , Dąbska A. , Kaczmarek Ł.

Przegląd Geologiczny

2022

tom Vol. 70, nr 5

410--416

Many research methods enable the determination of the permeability properties of the soil. These methods differ, inter alia, in accuracy, complexity, application ranges, and technical conditions. The choice of a particular method is often dictated by the purpose of determining the hydraulic conductivity. The review of the most popular methods facilitates the optimization of the selection, as well as the application of mutually verifying methods or using them at different stages of the research. The article summarizes selected methods of determining the soil hydraulic conductivity from common research groups, including correlation, laboratory, and field methods, as well as less frequently used geophysical methods.

Zmienność współczynników filtracji piasku gliniastego i geowłókniny w procesie długotrwałego przepływu

67%

Wojtasik D.

2006

tom 05

nr 2

W artykule przedstawiono wyniki laboratoryjnych badań współczynnika filtracji układu grunt-geowłóknina, które zostały przeprowadzone zgodnie z normąASTM D 5101-90. Badaniami objęto geowłókninę K-500 oraz piasek gliniasty przy zewnętrznych gradientach hydraulicznych w zakresie i = 1–10. Analiza wyników przeprowadzonych badań wskazuje, że do obliczeń projektowych powinno się wyznaczać, oprócz współczynnika filtracji geowłókniny i gruntu, także współczynnik filtracji układu grunt-geowłóknina. Zaproponowano obliczenie zmiany końcowego współczynnika filtracji układu grunt-geowłóknina na podstawie początkowych wartości współczynników filtracji gruntu i geowłókniny oraz zadanego gradientu hydraulicznego.

The paper presents the results of laboratory analysis of permeability coefficient tests carried out in the modied soil-geotextile permameter, recommended in ASTM standard D 5101-90. Laboratory tests were performed on nonwoven geotextile K-500 and clayey sand. The analysis of tests results indicates that in the design calculations for nonwoven geotextile used as filters not only permeability coeffcient of geotextile and soil, but also permeability coeffcient of soil-geotextile system should be determined. The change of the final permeability coefficient of soil-geotextile system based on the initial values of the permeability of geotextile and soil as well as hydraulic gradient were proposed.