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    Wyświetlanie 1-8 z 8
    Tytuł:
    Impact of T-Splitter on the Laminar Flow Field around Cylinder Pier
    Autorzy:
    Qasim, Rafi Mohammed
    Faisal, Safaa Hameed
    Jabbar, Tahseen Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/2204700.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    bridge pier
    hydraulic field
    laminar flow
    T-splitter
    Opis:
    The hydrodynamic pattern, which surrounds the pier near a splitter that has T-shape, is investigated by adopting a numerical method and using ANSYS Fluent Software to achieve computation. The essential objective of this paper refers to revealing the behavior of the hydrodynamic field around the pier due to the existence of the upstream splitter plate. The T-splitter plate has not been used in previous works for controlling the flow field around the cylinder body. The main assumptions adopted in solving the hydrodynamic problem are incompressible, steady, and laminar flow. Reynolds number values are taken from 40 to 200 to guarantee laminar flow with laminar vortex street. The numerical investigation focuses on two main variables. These variables are the horizontal distance between the rear portion of a splitter and the pier center and bubble length. The numerical study comprises pressure contours, water velocity contours, and streamlines. Results reveal that bubbles are generated and developed due to the existence of the splitter. Four bubbles are generated, two of them are formed in the region between the splitter rear portion and pier leading portion and the other two bubbles are formed at the cylindrical pier wake region. The size and length of these four bubbles are dominated by the Reynolds number, these bubbles are non-symmetrical. It is revealed from the solution that with the rise in Reynolds number values then the disturbance will be increased simultaneously. The horizontal distance dominates the hydraulic response, which is described by the streamlines, pressure contours, and water flow contours. Furthermore, the Reynolds number has a significant influence on the pressure contours, water flow contours, and streamlines. Finally, a correlation equation is derived relying on bubble length, horizontal distance, and Reynolds number.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 202--215
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody polowe oznaczania współczynnika filtracji utworów przypowierzchniowych z uwzględnieniem poprawek metodycznych na tle wstępnych wyników pomiarów stacjonarnych we Wrocławiu
    Field methods of evaluation of saturated hydraulic conductivity of near-surface soils, including correction formulas, on the background of preliminary results of stationary measurements in Wrocław
    Autorzy:
    Błachowicz, Marek
    Trałka, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/2061460.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    współczynnik filtracji
    metoda Porcheta
    infiltrometr dwupierścieniowy
    model infiltracji
    infiltracja inicjalna
    field hydraulic conductivity
    Porchet method
    inversed auger-hole method
    double-ring infiltrometer
    infiltration model
    initial infiltration
    Opis:
    Głównym celem przedstawionej pracy jest porównanie metod polowych oznaczania współczynnika filtracji w świetle potencjalnych błędów związanych z przeszacowaniem wartości współczynnika filtracji utworów przypowierzchniowych w strefie saturacji. Są one głównie wynikiem błędnych założeń o przeprowadzeniu pomiarów w warunkach pełnego nasycenia (strefie saturacji). Przedstawiono wyniki oznaczeń zrealizowanych w serii stacjonarnych oznaczeń współczynnika filtracji metodą Porcheta oraz infiltrometru dwupierścieniowego w dłuższym horyzoncie czasowym w wybranych miejscach na obszarze Wrocławia, uwzględniających zmienność sumy opadów, ale i wykształcenie litologiczne gruntów. Wykorzystując powszechnie stosowane metody oraz narzędzia analizy i interpretacji danych, przetestowano schematy postępowania pozwalające ograniczyć błędy estymacji współczynnika filtracji.
    The main purpose of the article is to compare the field method of the estimation of hydraulic conductivity of near-surface soils on the background of potential errors related to the determination of field-saturated hydraulic conductivity (Kfs). The overestimation of Kfs value is mainly a result of wrong assumptions about measurements under full-saturation conditions (saturation zone). The article presents results of experiment carried out in a series of stationary measurements of hydraulic conductivity using selected field methods in a longer time period in selected places in the city of Wrocław, taking into account variability of precipitation and lithology of soils. Using commonly applied methods and tools of data analysis and interpretation, the schemes of procedure were tested to reduce errors of fieldsaturated hydraulic conductivity estimation.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2019, 476, Hydrogeologia z. 17; 9--15
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal-hydraulic analysis of LTS cables for the DEMO TF coil using simplifi ed models
    Autorzy:
    Lewandowska, M.
    Dembkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146243.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    DEMO
    tokamak
    low Tc superconductors
    toroidal field coil
    thermal-hydraulic analysis
    Opis:
    The conceptual design activities for the DEMOnstration reactor (DEMO) – the prototype fusion power plant – are conducted in Europe by the EUROfusion Consortium. In 2015, three design concepts of the DEMO toroidal field (TF) coil were proposed by Swiss Plasma Center (EPFL-SPC, PSI Villigen), Italian National Agency for New Technologies (ENEA Frascati), and Atomic Energy and Alternative Energies Commission (CEA Cadarache). The proposed conductor designs were subjected to complete mechanical, electromagnetic, and thermal-hydraulic analyses. The present study is focused on the thermal-hydraulic analysis of the candidate conductor designs using simplifi ed models. It includes (a) hydraulic analysis, (b) heat removal analysis, and (c) assessment of the maximum temperature and the maximum pressure in each conductor during quench. The performed analysis, aimed at verification whether the proposed design concepts fulfil the established acceptance criteria, provides the information for further improvements of the coil and conductors design.
    Źródło:
    Nukleonika; 2017, 62, 1; 23-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of field tension infiltrometer data by parameter estimation
    Autorzy:
    Simunek, J.
    Wang, Dong
    Shouse, P.J.
    Van Genuchten, M.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/26040.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    field tension
    Wooding's analysis
    tension disc infiltrometer
    hydraulic property
    soil property
    parameter estimation
    Źródło:
    International Agrophysics; 1998, 12, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of marble powder amendment on hydraulic properties of a sandy soil
    Autorzy:
    Farhadi-Machekposhti, M.
    Valdes-Abellan, J.
    Pla, C.
    Benavente, D.
    Pachepsky, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082885.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    saturated hydraulic conductivity
    soil water
    retention curve
    field capacity
    plant available water
    pore size
    distribution
    Opis:
    Marble powder is one of carbonate rock amendments that is used to improve soil reaction. We hypothesized that the powdered marble addition can cause favorable changes in hydraulic properties of sandy soils. Six levels of marble powder addition to an aridisol soil (0%; M0; 5%; M5; 10%; M10; 15%; M15; 20%; M20 and 25%, M25; by bulk volume) were analyzed in triplicate. The saturated hydraulic conductivity and soil water retention curves were obtained. Pore space properties were investigated using soil water retention curves, mercury intrusion porosimetry and scanning electron microscopy. The saturated hydraulic conductivity significantly decreased (between 83 and 97% for M5 and M25 respectively) and parameters α and n of the van Genuchten model significantly decreased in marble-amended soils. Both field capacity and permanent wilting point increased with the addition of marble powder. Plant-available water, increased significantly until 10% of marble powder application; higher percentages of application did not provide additional significant changes in the plant-available water. Pore space distributions from soil water retention curves parameters showed an increase in the pore size range and a decrease in the average pore size; pore space distribution from the scanning electron microscopy also showed the presence of a new family of dominant pore sizes which was not detected by the soil water retention curves parameters approach. It was concluded that the addition of marble powder can improve the ability of soil to store water providing an advantage for irrigation water management in water scarce environments. Further research will have to address the impact of marble powder amendment under field semi-arid conditions.
    Źródło:
    International Agrophysics; 2020, 34, 2; 223-232
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using 1D and 2D computer models when predicting hydrodynamic and morphological parameters of a boulder block ramp: Poniczanka stream, Carpathians
    Autorzy:
    Plesiński, Karol K.
    Radecki-Pawlik, Artur
    Rivera-Trejo, Fabian
    Powiązania:
    https://bibliotekanauki.pl/articles/2203562.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    boulder blocks ramps
    low head hydraulic structures
    field measurement
    hydraulics
    riverbed morphology
    HEC-RAS model
    CCHE2D model
    Opis:
    When modelling flow and/or sediment transport in streams and rivers, one must frequently use the computer software of differing levels of complexity. The level of sophistication, accuracy, and quality of results are the parameters by which models can be classified as being 1D, 2D, or 3D; it seems certain that in the future, there will also be 4D and 5D models. However, the results obtained from very sophisticated models are frequently questionable, and designers in the field of hydraulic structures must have considerable experience distinguishing important information from irrelevant information. Thus, this paper aims to investigate the effect of the selected boulder block ramp hydraulic structure at Poniczanka stream on the bed-load transport. We evaluated sediment transport using the CCHE2D numerical model. We analysed several scenarios depending on the river bed type (erodible, non-erodible, rocky) and examined the rock blocks used for hydraulic structure construction. The obtained results were compared with the Hjulström and the Shields graph, which are a classic approach for identifying fluvial processes in river channels. In addition to these two methods, numerical modelling using the 1D HEC-RAS (Hydrologic Engineering Center’s River Analysis System) modelling were conducted, which included the determination of horizontal and vertical changes to the river bed morphology of the examined section of river reach as well as providing the basic hydrodynamics parameters which, from the practical point of view, designers involved in the process of designing ramps could use.
    Źródło:
    Journal of Water and Land Development; 2022, Special Issue; 34--48
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow roughness evaluation of mobile-bed streams
    Autorzy:
    Matousek, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/62556.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    Czech Republic
    bed load
    sediment transport
    flood flow
    slurry pipe
    upper plane bed
    stream
    field measurement
    bed roughness
    flood condition
    hydraulic roughness
    Opis:
    Recent field measurements of mobile-bed roughness in selected streams in Czech Republic are described. The results are collected in a database organized to a www catalogue. The field results of the bed roughness in two gravel-bed streams under flash flood conditions are discussed. A methodology is suggested for evaluation of the bed roughness of straight channels transporting sediments. A prediction of the bed roughness under the condition of intense sediment transport in the upper plane bed regime is demonstrated on the results of laboratory pressurized-pipe tests. An application to flood conditions in a steep mountain creek is shown in a case study.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2010, 11
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prace rozpoznawcze dotyczące gazu z łupków : wyniki terenowych badań środowiskowych
    Shale gas exploration : the results of environmental field studies
    Autorzy:
    Kantor, M.
    Konieczyńska, M.
    Lipińska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075339.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    badania terenowe
    gaz łupkowy
    wpływ środowiska
    szczelinowanie
    studnia głębinowa
    badania kompleksowe
    field studies
    shale gas
    environmental impact
    hydraulic fracturing
    well pad
    comprehensive research
    Opis:
    At the beginning of 2015 a research study, which covered the main unconventional hydrocarbon (shale gas) basins in Poland, was completed. The study was coordinated by the General Directorate for Environmental Protection. Field studies and analysis were carried out by the consortium led by Polish Geological Institute – National Research Institute, in collaboration with University of Science and Technology AGH in Cracow and Gdañsk University of Technology. Seismometric monitoring was conducted by the Central Mining Institute. The involvement of more than 60 specialists with interdisciplinary knowledge and international experience has provided high-quality results. The aim of the study was to analyze environmental impact of shale gas exploration, taking into account differentiated geological, geoenvironmental, land use, and technological data. The scope of the study included, among others: the groundwater and surface water, landscape, nature conservation forms, soil, noise and ambient air. The study was performed in 7 exploration areas around 7 different wells and included environment baseline study. The results show that there is no long-lasting, significant impact of shale gas exploration on the environment.
    Źródło:
    Przegląd Geologiczny; 2015, 63, 7; 404--409
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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