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    Wyświetlanie 1-11 z 11
    Tytuł:
    CFD-DEM simulation of raceway size and mechanical characteristics of industrial scale blast furnace
    Autorzy:
    Gao, Yuzhen
    Chan, Choon Kit
    Powiązania:
    https://bibliotekanauki.pl/articles/27315659.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    raceway
    CFD-DEM
    Computional Fluid Dynamics
    Discrete Element Method
    numerical simulation
    blast furnace
    Opis:
    The raceway plays a crucial role in ensuring the stable functioning of the ironmaking blast furnace. It is the key site where the chemical reaction of coke combustion takes place, providing the necessary heat and reducing gas for the upper iron ore reduction process. Consequently, the size of the raceway serves as an essential indicator of the blast furnace’s operational condition. In this study, a mathematical model for the raceway of an industrial-scale blast furnace was established. Extensive innovation investigations were conducted to explore the characteristics pertaining to the raceway’s size. The simulation outcomes demonstrate that both the particle size and the inlet velocity exert significant influences on the raceway dimensions. Specifically, the height of the raceway is predominantly affected by the particle size, whereas the inlet velocity predominantly influences the depth of the raceway.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 3; 71--78
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A proper borehole pattern design for coal seam methane drainage in Tabas coal mine using Comsol Multiphysics
    Autorzy:
    Bagherzadeh, Ali
    Najafi, Mehd
    Marji, Mohammad Fatehi
    Noroozi, Mehdi
    Powiązania:
    https://bibliotekanauki.pl/articles/2201375.pdf
    Data publikacji:
    2022
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    numerical modeling
    borehole patterns
    COMSOL Multiphysics
    CFD simulation
    coal gas drainage
    modelowanie numeryczne
    schematy otworów wiertniczych
    symulacja CFD
    odmetanowanie
    Opis:
    Optimizing the operational parameters of the borehole pattern in the coal seam includes the maximum amount of gas to be drained with the least amount of drilling, investment, and drainage time. The main purpose of this research is to properly design the drainage borehole pattern in the C1 coal seam of the Tabas coal mine. In this research, the Comsol Multiphysics software was used for numerical modeling of the boreholes. According to the method of diffusion of methane gas in a coal seam, the reduction of methane gas concentration and the amount of gas released from the coal blocks were approximated. For the gas drainage boreholes, the three patterns of the rectangular, parallelogram, and triangular forms were considered. Also, the boreholes were modeled with the three diameters of 76, 86, and 96 mm. This modeling was performed for 180 days of drainage operation and showed that the triangular pattern was more suitable than the other two patterns. The presented model is applicable in coal mines where gas drainage operations are necessary and helps engineers design the patterns of drainage boreholes to maximize their gas drainage efficiency.
    Źródło:
    Journal of Sustainable Mining; 2022, 21, 1; 54--64
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of ventilated facades in terms of airflow in the air gap
    Autorzy:
    Schabowicz, Krzysztof
    Zawiślak, Łukasz
    Staniów, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/1845140.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ventilated facade
    heat transfer
    heat transmission
    CFD
    numerical simulation
    energy efficient facade
    Opis:
    The gradual exploitation of the natural environment has forced most developed countries to promote ecological solutions and the development of sustainable construction. Ventilated facades perfectly match into this trend, and with their appropriate design, they bring real energy savings. This paper analyzes numerically the influence of the inflowing air, mimicking the wind, on the efficiency of heat removal from the ventilated space and heat transmission by thermal radiation and conduction through the consecutive layers of the external wall. For the purpose of comparison, two variants of ventilated facade were adopted: open and closed joints, at different wind speeds prevailing outside. The results obtained show that in windless weather, the ventilated facade with open joints shows higher heat removal efficiency and thus lower heat transmission to the building interior. At higher wind speeds of 5 m/s, the open-joint and closed-joint ventilated facades achieve similar heat transfer efficiency, and the prevailing temperature inside the building for the two technologies is almost identical. Subsequent increments of incoming wind on the building result in minimal differences in the heat transmission to the building interior, representing changes of about 0.1°C at increments of another 5 m/s of incoming wind. Conscious use of this facade technology, along with appropriate urban design of cities, can help reduce the energy needed to cool buildings during the summer period.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 3; 224-236
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and simulation of an air conditioning project in a hospital based on computational fluid dynamics
    Plan i symulacja projektu klimatyzacji w szpitalu, na podstawie obliczeniowej mechaniki płynów
    Autorzy:
    Ding, X. R.
    Guo, Y. Y.
    Chen, Y. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/230580.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    szpital
    sala operacyjna
    klimatyzacja
    mechanika płynów
    CFD
    symulacja numeryczna
    model turbulencji
    projekt
    hospital
    operating room
    air conditioning
    fluid mechanics
    numerical simulation
    turbulence model
    design
    Opis:
    This study aims to design a novel air cleaning facility which conforms to the current situation in China, and moreover can satisfy our demand on air purification under the condition of poor air quality, as well as discuss the development means of a prototype product. Air conditions in the operating room of a hospital were measured as the research subject of this study. First, a suitable turbulence model and boundary conditions were selected and computational fluid dynamics (CFD) software was used to simulate indoor air distribution. The analysis and comparison of the simulation results suggested that increasing the area of air supply outlets and the number of return air inlets would not only increase the area of unidirectional flow region in main flow region, but also avoid an indoor vortex and turbulivity of the operating area. Based on the summary of heat and humidity management methods, the system operation mode and relevant parameter technologies as well as the characteristics of the thermal-humidity load of the operating room were analyzed and compiled. According to the load value and parameters of indoor design obtained after our calculations, the airflow distribution of purifying the air-conditioning system in a clean operating room was designed and checked. The research results suggested that the application of a secondary return air system in the summer could reduce energy consumption and be consistent with the concept of primary humidity control. This study analyzed the feasibility and energy conservation properties of cleaning air-conditioning technology in operating rooms, proposed some solutions to the problem, and performed a feasible simulation, which provides a reference for practical engineering.
    Przedmiotem tego badania była czysta sala operacyjna. Zastosowano technologię czystej klimatyzacji. Obciążenie chłodnicze czystej klimatyzacji w okresie letnim zostało obliczone przy użyciu praktycznej metody obciążenia chłodniczego klimatyzacji oraz oprogramowania służącego do obliczania zużycia energii. Wyniki obliczeń zostały porównane i przeanalizowane. Model rozprowadzania powietrza był symulowany za pomocą Airpak 3.0, a symulowane wyniki zostały przeanalizowane.
    Źródło:
    Archives of Civil Engineering; 2017, 63, 2; 23-38
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strength analysis of a large-size supporting structure for an offshore wind turbine
    Autorzy:
    Niklas, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/259468.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    renewable energy sources
    offshore wind power industry
    supporting structure
    strength analysis
    FEM
    computer simulation
    numerical calculations
    CFD
    conceptual design
    buckling
    thin-walled structure
    Opis:
    The offshore wind power industry is the branch of electric energy production from renewable sources which is most intensively developed in EU countries. At present, there is a tendency to install larger-power wind turbines at larger distances from the seashore, on relatively deep waters. Consequently, technological solutions for new supporting structures intended for deeper water regions are undergoing rapid development now. Various design types are proposed and analysed, starting from gravitational supports (GBS), through monopiles and 3D frame structures (jackets, tripods), and ending with floating and submerged supports anchored to the seabed by flexible connectors, including TLP type solutions. The article presents the results of examination of an untypical large-size gravitational support intended for waters with the depth of up to 40 m. Firstly, a general concept of the new design is presented, while the next basic part of the article describes the support design in detail and provides its strength analysis. The examined support has the form of a large steel container consisting of conical segments. The strength analysis was conducted using the finite element method (FEM), in accordance with the standard DNVGL-ST-0126. Modifications introduced to the most heavily loaded structural node of the support, which was the set of base bottom trusses, is also included. The results of the performed analysis prove that the presented concept of supporting structure for a 7MW turbine meets fundamental strength criteria. The nonlinear buckling analysis was performed to evaluate the critical force acting on the support, which turned out to be 1.44 times as large as the maximum load of the wind turbine. Potentially important issues for further analyses have been identified as those resulting from the asymmetry of basic loads acting on the support.
    Źródło:
    Polish Maritime Research; 2017, S 1; 156-165
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3-D simulation of vertical-axial tidal current turbine
    Autorzy:
    Zhang, Z.
    Ma, Y.
    Jiang, J.
    Liu, W.
    Ma, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/260421.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    tidal current energy
    vertical-axial turbine
    hydrodynamic performance
    CFD
    numerical simulation
    3-D effect
    Opis:
    Vertical-axial tidal current turbine is the key for the energy converter, which has the advantages of simple structure, adaptability to flow and uncomplex convection device. It has become the hot point for research and application recently. At present, the study on the hydrodynamic performance of vertical-axial tidal current turbine is almost on 2-D numerical simulation, without the consideration of 3-D effect. CFD (Computational Fluid Dynamics) method and blade optimal control technique are used to improve accuracy in the prediction of tidal current turbine hydrodynamic performance. Numerical simulation of vertical-axial tidal current turbine is validated. Fixed and variable deflection angle turbine are comparatively studied to analysis the influence of 3-D effect and the character of fluid field and pressure field. The method, put the plate on the end of blade, of reduce the energy loss caused by 3-D effect is proposed. The 3-D CFD numerical model of vertical-axial tidal current turbine hydrodynamic performance in this study may provide theoretical, methodical and technical reference for the optimal design of turbine.
    Źródło:
    Polish Maritime Research; 2016, 4; 73-83
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena wpływu modelu burzliwości na wyniki symulacji numerycznych przepływu wielofazowego w zbiorniku z mieszadłem CD 6
    Evaluation of turbulence model impact on the numerical simulation results of two-phase gas – liquid flow in a stirred tank with the CD 6 impeller
    Autorzy:
    Musiał, M.
    Karcz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073132.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mieszanie
    model burzliwości
    symulacje numeryczne
    CFD
    mixing
    turbulence model
    numerical simulation
    Opis:
    Badania miały na celu określenie wpływu modelu burzliwości (k-ε, SST) na wyniki symulacji numerycznych (prędkość cieczy, udział gazu zatrzymanego w cieczy, rozmiar pęcherzy gazowych) przepływu dwufazowego wodny roztwór sacharozy – powietrze. Symulacje numeryczne przeprowadzono w zbiorniku o średnicy wewnętrznej D = 0,288 m zaopatrzonym w mieszadło CD 6. Na podstawie przeprowadzonych badań stwierdzono, że zastosowany w obliczeniach model burzliwości ma znaczący wpływ na średni rozmiar pęcherzy gazu.
    The aim of this study was to determine the effect of turbulence model (k-ε, SST) on numerical simulation results (liquid velocity, gas hold-up and bubble size) in the two-phase saccharose solution – air flow system. Simulations were carried out for a vessel of inner diameter equal to 0.288 m, equipped with the CD 6 impeller. The results showed that the turbulence model used in computations has a significant impact on the size of gas bubbles.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2015, 6; 342--343
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda symulacji numerycznej jako narzędzie do przewidywania erozji w instalacjach przemysłowych
    Numerical simulation method as a tool for erosion prediction in industrial process lines
    Autorzy:
    Malcher, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2072585.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    erozja
    symulacja numeryczna CFD
    elektrofiltr
    electrostatic precipitator
    erosion
    CFD numerical simulation
    Opis:
    Następstwem erozji jest niszczenie materiału prowadzące do różnego rodzaju uszkodzeń, a w konsekwencji do awarii urządzeń przemysłowych. W pracy zamodelowano numerycznie (CFD) to zjawisko na przykładzie kanałów spalin doprowadzających zapylony gaz do elektrofiltru. Przedstawiona weryfikacja geometrii badanego układu pod kątem destrukcyjnego działania erozji zdaniem autora stwarza możliwość określenia naddatków materiału lub daje wskazówki do zastosowania materiału o podwyższonej odporności na ścieranie tam, gdzie symulacja wykazała, że erozja jest znacząca.
    The consequence of erosion is material destruction leading to different types of damages, and consequently to failure of industrial equipment. This phenomenon was modeled (CFD) on the example of flue gas channels supplying contaminated gas to the electrostatic precipitator. The verification of test system geometry for the erosion destructive action makes it possible to determine material allowances or gives indications for the use of material with high abrasion resistance, in cases where according to the simulation, the erosion is significant.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2013, 3; 204--205
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical model of borehole heat exchanger in Ansys CFX software
    Numeryczny model otworowego wymiennika ciepła w pakiecie Ansys CFX
    Autorzy:
    Śliwa, T.
    Gołaś, A.
    Wołoszyn, J.
    Gonet, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/220148.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pionowy otworowy wymiennik ciepła
    test reakcji termicznej TRT
    CFD
    symulacja numeryczna
    borehole heat exchanger (BHE)
    thermal response test (TRT)
    numerical simulation
    Opis:
    The paper presents the results of numerical simulation of thermal response test (TRT) and the results of the experiment of TRT in Johan Paul the second Centre “Have No Fear!” in Cracow. The aim of the study is to determine and compare the values of effective thermal conductivity of rocks obtained in TRT experiment with the results obtained from the numerical simulation of TRT. The results are shown as graphs of temperature variation in the time on inlet and outlet of the borehole heat exchanger (BHE) and as drawings of thermal distribution. Borehole heat exchanger is constructed of a single u-tube at a depth of 180 m. In the numerical simulation of TRT was included geological profile of the rock mass and the associated changes in thermal properties of rocks. Temperature dependence of liquid viscosity were also adopted. Groundwater flow has been neglected. Presented mathematical model based on energy balance equation, Navier-Stokes equation and flow continuity equation was solved using the finite volume method. To numerical calculation was used ANSYS CFX software.
    W pracy przedstawiono wyniki numerycznej symulacji testu reakcji termicznej górotworu (TRT) oraz wyniki z przeprowadzonych badań polowych badawczego wymiennika otworowego w budowanym Centrum Jana Pawła II „Nie lękajcie się” w Krakowie-Łagiewnikach. Celem pracy jest określenie oraz porównanie wartości efektywnej przewodności cieplnej skał otrzymanej w badaniach polowych z wynikami otrzymanymi z numerycznej symulacji testu TRT. Wyniki przedstawiono w postaci wykresów zmian temperatury nośnika ciepła w czasie na zasilaniu i powrocie z otworowego wymiennika ciepła oraz w formie rysunków przedstawiających rozkłady pól temperatury. Otworowy wymiennik ciepła zbudowany jest z pojedynczej u-rurki o głębokości 180 m. W numerycznej symulacji testu uwzględniono profil litologiczny górotworu oraz związane z tym zmiany właściwości termicznych skał. Uwzględniono również zmiany lepkości czynnika grzewczego od temperatury. Nie uwzględniono natomiast przepływu wód podziemnych. Przedstawiony model matematyczny oparty na równaniach bilansu energii, równaniach Naviera-Stoksa oraz równaniach ciągłości przepływu rozwiązano z wykorzystaniem metody objętości skończonych. Obliczenia numeryczne przeprowadzono w środowisku Ansys CFX.
    Źródło:
    Archives of Mining Sciences; 2012, 57, 2; 375-390
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applicability of flow simulation models to the case of radial inflow onto a rotating core
    Autorzy:
    Biernacki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955813.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    turbulent flow
    numerical flow simulation
    flow simulation models
    steam turbines
    turbine inlet
    computational fluid dynamics CFD
    Opis:
    The paper presents the results of fluid flow simulations carried out by means of the FIDAP7.6 program (a fluid dynamics FEM package) for the case of radial inflow onto a rotating shaft. The particular geometric configuration has been chosen to resemble a generalized inlet chamber of twin low-pressure steam turbines, but with the axial outlet section extended to allow better observation of flow instabilities in that region. The calculations were carried out for the same channel geometry for both compressible and incompressible flow, using the same or slightly varying boundary conditions. Extensive variation in non-physical parameters of the model was explored, such as applying different meshes over the region, as well as utilizing different turbulence and upwinding models. The intent of this research was to evaluate the relative applicability of the various available flow models to the simulation of axisymmetric flows with steep velocity gradients, and to discover the limitations of these models. The calculations have in fact established significant differences in the behavior of the simulated flow for the different meshes and models. Some results were characterized by extensive areas of recirculating flow whereas others, for the same boundary conditions, showed no recirculation. Correct near-wall meshing as well as the choice of the upwinding scheme were established as the critical factors in this regard. There was also noticeable variation in outlet velocity profiles. An extensive zone of separation within the investigated channel as well as a standing annular vortex near the point of stagnation are flow features of some interest. These patterns of flow change in response to the changing non-physical parameters; the separation zone in particular is absent or slow to develop under some setups. The influence of inflow parameters, the initial velocity distribution and turbulent intensity in particular, on flow behavior in contact with the rotating shaft have also been an area of investigation, as these are often defined with considerable uncertainty in practical applications. It was observed that some latitude in assuming these parameters did not significantly alter the relevant flow parameters at outlet (the velocity and pressure distributions), although it did induce variation in other aspects of the flow (such as the extent of the standing vortex).
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 2; 141-154
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of 3D flow in axial turbomachines
    Autorzy:
    Yershov, S.
    Rusanov, A. V.
    Gardzielewicz, A.
    Lampart, P.
    Świrdyczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953978.pdf
    Data publikacji:
    1998
    Wydawca:
    Politechnika Gdańska
    Tematy:
    numerical simulation
    axial turbomachines
    3D flow
    3D viscous compressible flow
    Navier-Stokes equation
    ENO reconstruction
    computational efficiency
    computational fluid dynamics CFD
    Godunov-type upwind differencing
    Opis:
    The paper is intended to describe a method for the calculation of 3D viscous compressible (subsonic or supersonic) flow in axial turbomachines described in the form of thin-layer Reynolds-averaged Navier-Stokes equations. The method draws on Godunov-type upwind differencing and ENO reconstruction suggested by Harten (1987), so as to assure monotonicity preservation and high accuracy of computational results. The computational efficiency is achieved thanks to the implementation of a simplified H-type multi-grid approach and delta -form implicit step. Turbulent effects are simulated with the help of a modified algebraic model of Baldwin-Lomax (1978). This method was at the foundation of a computer code-a complex software package to calculate 3D flow in multi-stage turbomachines that allows us to obtain local characteristics, like temperature, pressure, density or velocity distributions, as well as global characteristics, such as flow rates, stage reaction, flow efficiency for the considered turbine/compressor stage. The paper also gives selected results of computation of a number of turbomachinery cascades, showing that these results agree reasonably well with the available experimental data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 2; 319-347
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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