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    Wyświetlanie 1-8 z 8
    Tytuł:
    Development of foam-breaking measures after removing liquid contamination from wells and flowlines by using surface-active substances
    Autorzy:
    Volovetskyi, V. B.
    Doroshenko, Ya. V.
    Stetsiuk, S. M.
    Matkivskyi, S. V.
    Shchyrba, O. M.
    Femiak, Y. M.
    Kogut, G. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201061.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    well
    gas
    flowline
    liquid removal
    gas-fluid flow
    foam breaking
    odwiert
    gaz
    linia przepływu
    usuwanie cieczy
    przepływ gaz-ciecz
    Opis:
    Purpose The purpose is to consider the complications that arise during the operation of gas condensate wells, in particular, the accumulation of liquid contamination. Development of new approaches to improve the efficiency of the separation equipment performance of gas gathering and treatment systems when a multiphase flow enters. Development of a foam breaking method in a gas-liquid flow after removal of liquid contaminants from wells and flowlines using surfactants. Design/methodology/approach An analysis was made of the complications that may arise when removing liquid contaminants from wells and flowlines using surfactants. Measures have been developed that will make it possible to timely prevent the ingress of foam into the separation equipment of gas gathering and treatment systems. Using computational fluid dynamics (CFD) modelling, an effective foam-breaking device was developed by supplying stable hydrocarbon condensate. Findings A method to minimize the negative impact of foam on the operation of separation equipment after fluid removal from wells and gas condensate field flowlines using a surfactant solution was elaborated. A method for its breaking was proposed to prevent the flow of foam into the gas processing unit. This method foresees the application of the technological scheme layout for supplying a stable hydrocarbon condensate to a gas-liquid flow entering the separators of the first of separation, both the main line and the measuring line. CFD modelling was used to study the process of foam breaking by feeding hydrocarbon condensate into it. The influence of the hydrocarbon condensate supplying method on gas-dynamic processes (distribution of pressure, velocity, volumetric particles of phases), and the efficiency of foam breaking was estimated. It was established that the supply of hydrocarbon condensate from one branch pipe to the pipeline through which the foam moved did not ensure its complete breaking. To increase the efficiency of foam breaking, a device with designed four nozzles for supplying hydrocarbon condensate was developed. CFD modelling made it possible to substantiate that in this case, a pressure reduction zone appeared at the place of condensate supply. Because of a sharp change in pressure, a strong improvement in the effect of foam breaking occurred. The understanding of the regularities of foam breaking processes by hydrocarbon condensate was obtained, and the design of a device for the complete foam breaking was developed. Research limitations/implications The obtained results of laboratory studies have shown that a sharp decrease in the stability of the foam occurs under the condition of an increase in the volume of stable hydrocarbon condensate added to the studied model of mineralized formation water. Based on the results of CFD modeling, a device for breaking foam by stable hydrocarbon condensate has been worked out, the effectiveness of which will be confirmed experimentally and in field conditions. Practical implications The results of the performed laboratory studies and CFD modelling allow a more reasonable approach to using various available methods and measures to prevent the ingress of foam with a gas-liquid flow into the separation equipment of gas gathering and treatment systems. This approach makes it possible to develop new effective ways and measures to prevent this complication. Originality/value Based on CFD modelling, it was found that when a stable hydrocarbon condensate is supplied into a gas-liquid flow, foam breaks. A method for breaking foam in a gas-liquid flow has been developed, which is original and can be introduced in practice.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 114, 2; 67--80
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental research and CFD calculations based investigations into gas flow in a short segment of a heavily worn straight through labyrinth seal
    Autorzy:
    Joachimiak, D.
    Krzyślak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/258744.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    labyrinth seals
    turbomachines
    fluid-flow machines
    experiment
    CFD
    gas velocity
    Opis:
    Steam turbines are used as propulsion components in not only power plants but also on merchant and naval ships. The geometry of the steam turbine seals changes throughout the machine life cycle. The rate of deterioration of these seals, in turn, affects heavily the efficiency of the thermal machine. However, the literature overview does not provide any research reports on flow phenomena occurring in heavily deteriorated seals. The paper describes the course and results of investigations into a model straight through labyrinth seal composed of 4 discs, each with the slot height of 2 mm. The investigations have been conducted with air as the working medium. Changes of gas flow parameters due to wear were analysed. Based on the experimental data, more intensive leakage was observed as the result of the increased slot height. The static pressure distribution along the examined segment was measured. The experimentally recorded distribution differed remarkably from the theoretical assumptions. Another part of the experimental research focused on comparing the gas velocities at points situated upstream of the first and second seal disc. The velocity measurements were carried out using a constant temperature wire probe. This part of the investigations provided opportunities for analysing the influence of seal wear on gas flow conditions in the seal segment. The paper compares the results of the experimental research with those obtained using the CFX software. The presented results of velocity distributions provide a clear picture of the nature of the gas flow in the seal, which enables its analysis.
    Źródło:
    Polish Maritime Research; 2017, 2; 83-88
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adress for Professor Krzysztof Jan Jesionek Anniversary
    Autorzy:
    Lewandowski, J.
    Gnutek, Z.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175358.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam and gas turbine
    power boiler
    compressors
    fluid-flow machinery
    power plants
    Opis:
    This article presents professional activity of Krzysztof Jesionek within the background of his personal career in the field of heat and power engineering on Wrocław University of Technology. In particular, we present stages of scientific and professional development with an emphasis on nature Professor Jesionek’s career main driving forces as a result of his cooperation with industry and power engineering.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 3-20
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gas-condensate banking and well deliverability : a comparative study using analytical- and numerical models
    Autorzy:
    Ursin, J. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/298842.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    gas condensate
    two phase fluid flow
    condensation
    reservoir condensate saturation
    effective permeability
    gas and condensate production
    linear dynamics
    numerical simulation
    Opis:
    Reservoir condensate blockage in the reservoir and in particular in the close vicinity of the wellbore may result in significant loss of well deliverability for medium to tight gas reservoirs. The dynamics of fluid flow in these types of reservoirs are investigated by way of analytical description and by numerical simulation of radial two phase flow behavior. The analytical model is based on a single phase semi steady-state solution, being revised for two phase flow of gas and condensate oil. As the liquid is dropping out of the gas, a saturation distribution of immovable oil is seen to develop radially in the reservoir with time. Condensed oil not being part of this saturation distribution is produced to the surface. The numerical model is a cylindrical, single well, fine gridded, simulation model run on the Eclipse E300 compositional simulator. The base case study comprises a rich gas condensate fluid (GOR ~ 1000 Sm3/Sm3), an initial gas-in-place volume of 750 MSm3, and reservoir permeability of 10 mD. A gas flow rate of 0.5 MSm3/day is leading to a production period of about 4 years. A comparative study is performed by varying parameters such as pressure development, development of bank of immovable oil both radially and as function of time, condensate blockage effects, and gas and condensate oil production and onset of reduced well deliverability. Sensitivity analysis are performed by studying variation in the productivity index, non-Darcy and mechanical skin, and sensitivities related to permeability. It has been confirmed in this study that condensate blockage has a direct and negative impact on well deliverability, where both the plateau period and the bottom hole pressure are reduced. We also show that the analytical model compares well with the numerical models and that many features describing gas-condensate banking and well deliverability are adequately described in the model. The analytical model also offers insight into the process of reservoir liquid storage in gas condensate reservoirs.
    Źródło:
    AGH Drilling, Oil, Gas; 2016, 33, 2; 259-289
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of elevated pressure on gas-solid flow properties in a powder feeding system
    Autorzy:
    Ren, Guanlong
    Sun, Haijun
    Xu, Yihua
    Li, Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/2174817.pdf
    Data publikacji:
    2022
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Powder engine
    Pressure effect
    Dense gas-solid two-phase flow
    Euler-Euler two-fluid model
    Numerical simulation
    Opis:
    In view of the powder feeding system, a multi-physical coupling model of the gas-powder-piston was established based on the Euler-Euler two-fluid model. The numerical simulation method was applied to explore the effects of dense gas-solid flow characteristics under different operating pressures. The results show that gas-solid pulsations at different operating pressures are mainly concentrated in the upper part of the powder tank. An elevated operating pressure efficiently decreases the powder layer area (εp = 0.1) fluctuation. As the operating pressure increases from 0.5 MPa to 3.0 MPa, the rising time and fluctuation rate of pressure are reduced by 71.4% and 62.3%, respectively, and the pressure in the tank has a long stabilization period. Meanwhile, the variation of the instantaneous powder flow rate is more stable and its average value is closer to the theoretical. A high-pressure environment is more conducive to the stable transportation of powder.
    Źródło:
    Polish Journal of Chemical Technology; 2022, 24, 3; 41--52
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modelling of the process of pipeline deformation through which gas-liquid mixtures with aggressive components are transported
    Autorzy:
    Oliynyk, A. P.
    Feshanych, L. I.
    Grygorchuk, G. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172155.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    tense state
    pipeline
    viscous fluid flow
    dynamic viscosity
    Navier-Stokes equations
    gas mixture
    rurociąg
    lepkość dynamiczna
    równania Naviera-Stokesa
    mieszanka gazowa
    Opis:
    Purpose Mathematical modelling of the process of deformation of pipeline, transporting gas-liquid mixtures with aggressive components and a comparative analysis of the value of the specified velocity depending on the dynamic viscosity of the multicomponent gas mixture is conducted. Design/methodology/approach A mathematical model of the process of leakage of the transported product due to the loss of tightness of the pipe based on the system of Navier-Stokes equations with boundary conditions with considering the geometry of the leakage zones and the value of the leakage rate is implemented. Findings Models of the process of deformation of the pipeline due to displacements of a certain set of surface points by specifying different types of functions, describing the geometry of deformed sections are constructed. The method of calculating the tensely deformed state based on the data on the movement of surface points by comparing different ways of setting functions, taking into account the actual configuration of sections and axes is improved. The change of flow characteristics in the pipeline when changing the structure of the mix, transported by studying of influence of change of dynamic viscosity is investigated; The method of calculating the rate of leakage of the mixture in case of loss of tightness due to the occurrence of critical stresses in the pipe material is improved. Research limitations/implications Building a model of the deformation process, information about the nature, duration of forces and loads affecting the pipeline is not used. The law of the pipeline movement was constructed having taken into account the deformation of the sections in three directions. The necessity to take wind loads into account, estimating the real tensely deformed state was displayed. Practical implications Using the method of calculating the tensely deformed state based on the data on the movement of surface points by comparing different ways of setting functions, taking into account the actual configuration of sections and axes. Originality/value According to the computational algorithms created on the basis of the specified models, the calculations of the tense state of the pipelines and the flow rate of the mixture depending on its composition were performed. An analysis of the results of calculations - tense intensity and flow rate depending on the dynamic viscosity of the mixture is performed. The influence on the flow parameters - the flow rate of the mixture and the force of hydraulic resistance - changes in the dynamic viscosity of the mixture is analyzed.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 111, 2; 57--63
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza numeryczna odciążania pomieszczeń gaszonych gazem
    Numerical study of pressure relief in gas-extinguished enclosures
    Autorzy:
    Październik, Michał
    Boroń, Sylwia
    Kubica, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1955821.pdf
    Data publikacji:
    2021
    Wydawca:
    Szkoła Główna Służby Pożarniczej
    Tematy:
    stałe urządzenia gaśnicze gazowe
    przyrost ciśnienia po wyładowaniu
    numeryczna mechanika płynów
    przepływ przez przewody wentylacyjne
    odciążanie pomieszczeń
    fixed gas extinguishing devices
    pressure rise after discharge
    computational fluid dynamics
    flow through ventilation ducts
    pressure relief of enclosures
    Opis:
    Celem pracy jest zaproponowanie modelu dyskretnego wykorzystującego metodę objętości skończonych do wyznaczania oporu przepływu gazu gaśniczego przez przewód wentylacyjny. Wykorzystując opracowany model, wyznaczono przyrost ciśnienia po wyładowaniu w pomieszczeniu odciążanym bezpośrednio na zewnątrz. Zakres pracy stanowi charakterystyka przepływu gazu przez przewody wentylacyjne, wykorzystanie numerycznej mechaniki płynów do stworzenia modelu symulującego wyładowanie i przepływ przez przewody wentylacyjne gazu gaśniczego oraz przeprowadzenie części badawczej porównującej obliczeniowy charakter przepływu z rzeczywistym. W ramach pracy dowiedziono, że wykorzystując model turbulencji LES, można oszacować średnie ciśnienie w pomieszczeniu podczas wyładowania, z dokładnością wystarczającą na początkowym etapie projektowania.
    The aim of the work is to propose a discrete model that uses the Finite Volume Method to determine the resistance of the extinguishing gas flow through a ventilation duct. Using the developed model, the pressure rise after discharge was determined in the room that was relieved directly to the outside. The scope of the work comprises the characteristics of the gas flow through ventilation ducts, the use of Computational Fluid Dynamics to create a model that simulates the discharge and flow of the extinguishing gas through the ventilation ducts along with a comparison of the computational nature of the flow to the real one. The study proved that the use of the LES turbulence model makes it possible to estimate the average pressure in the enclosure during the discharge with an accuracy sufficient at the initial design stage.
    Źródło:
    Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2021, 3, 79; 31-49
    0239-5223
    Pojawia się w:
    Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie numerycznej mechaniki płynów CFD do modelowania zabezpieczania pomieszczeń stałymi urządzeniami gaśniczymi gazowymi
    Application of Computational Fluid Dynamics CFD for Modeling of Protection of Premises by Fixed Gaseous Extinguishing System
    Autorzy:
    Boroń, S.
    Kubica, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/372766.pdf
    Data publikacji:
    2016
    Wydawca:
    Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
    Tematy:
    stałe urządzenie gaśnicze gazowe
    gaz obojętny
    czyste środki gaśnicze
    czas retencji
    model przepływu gazu przez pomieszczenie
    numeryczna mechanika płynów CFD
    fixed gaseous extinguishing system
    inert gases
    clean extinguishing agents
    retention time
    model of gas flow through the room
    computational fluid dynamics CFD
    Opis:
    Cel: W artykule podjęto problem bezpieczeństwa pożarowego pomieszczeń chronionych instalacją stałych urządzeń gaśniczych gazowych. Zwiększenie precyzji i wiarygodności modelowania procesu gaszenia gazem gaśniczym można osiągnąć poprzez zastosowanie metod numerycznej mechaniki płynów CFD przy wykorzystaniu oprogramowania ANSYS FLUENT. Celem badań było opracowanie modelu numerycznego CFD wypływu gazu gaśniczego z przestrzeni chronionej i zbadanie z jego pomocą skuteczności gaśniczej określonych typów gazów. Projekt i metody: W artykule przedstawiono propozycję numerycznego modelu przepływu gazu gaśniczego przez pomieszczenie. Zawarto także opis badań eksperymentalnych i obliczeń analitycznych przeprowadzonych w celu jego walidacji. Wskazano na przykłady praktycznego wykorzystania opracowanego modelu CFD do symulacji, których wyniki mogą wspomagać projektowanie stałych urządzeń gaśniczych gazowych. Wyniki: Analiza porównawcza zebranych wyników symulacji pozwoliła wskazać model Standard k- ε jako model zapewniający największą zbieżność wyników z wynikami badań w skali rzeczywistej. Wartości czasu retencji uzyskane w drodze symulacji były bliższe wynikom rzeczywistym w porównaniu z wartościami otrzymanymi na podstawie obliczeń przeprowadzonych z wykorzystaniem modelu normowego. Wnioski: Modelowanie CFD umożliwia poddanie analizie mechanizmu przepływu gazu przez pomieszczenie z większą dokładnością niż dotychczas stosowane modele. Pozwala to na optymalizację doboru rodzaju oraz ilości gazu gaśniczego z uwagi na czas retencji. Dobór gazu gaśniczego o gęstości mieszaniny zbliżonej do gęstości powietrza daje możliwość uzyskania czasu retencji przekraczającego czas retencji otrzymany w przypadku zastosowania gazów wskazanych w obowiązujących normach. Zastosowanie modelowania CFD umożliwia prowadzenie badań przy wykorzystaniu przestrzeni wirtualnej, eliminując przy tym niebezpieczeństwo związane z prowadzeniem prac pomiarowych stanowiących zagrożenie dla ludzi oraz redukuje koszty finansowe związane z wyładowaniem gazu.
    Aim: The problem of fire safety of areas protected by fixed gaseous extinguishing system is discussed. Increasing the accuracy and reliability of the modeling of gas extinguishing process can be achieved by using methods of computational fluid dynamics CFD using ANSYS FLUENT software. The aim of the study was to develop a numerical CFD model of extinguishing gas flow of the protected space and to examine the extinguishing effectiveness of particular type of norm gases and newly proposed extinguishing gas mixtures with a density similar to the density of air, which significantly limited the phenomenon of outflow of gas from the room and allowed to get longer retention times. Project and methods: The paper proposes a numerical model of extinguishing gas flow through the room which was developed using ANSYS Fluent program, the description of experimental researches carried out in real scale and analytical calculations based on the norm model of gas flow through the room carried out to validate the created CFD model. Examples of practical use of CFD model for simulation, results of which can provide information to support the design of fixed gaseous extinguishing systems were presented. Results: On the basis of a comparative analysis of the collected simulation results model Standard k-ε was indicated as a model that provides the greatest convergence of test results in real scale. Retention times obtained by the computer simulation were closer to real scale results than the retention times obtained on the basis of calculation using the norm wide interface model. Conslusions: The use of CFD modeling allows to review the mechanism of gas flow through the room with greater accuracy than previously used models. This allows for optimal selection of the type and amount of extinguishing gas due to the retention time. Selection of extinguishing gas with the mixture density similar to air density, makes it possible to obtain a retention time exceeding the retention time of the gases specified in the applicable standards. The use of CFD modeling allows to conduct research using virtual space, eliminating the danger related to measurement process posing a threat to humans and reduce financial costs associated with the discharge of extinguishing gas.
    Źródło:
    Bezpieczeństwo i Technika Pożarnicza; 2016, 42, 2; 151-157
    1895-8443
    Pojawia się w:
    Bezpieczeństwo i Technika Pożarnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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