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    Wyświetlanie 1-9 z 9
    Tytuł:
    The calculation long-term physical field created by water flow around the ship
    Autorzy:
    Bielański, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331900.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    water flow around the ship
    hydrodynamics
    Opis:
    The paper presents a description of the problems with fluid flow around a ship. Using the described solution of the problem were performed numerical calculations using the boundary element method. Were also presented preliminary results of the calculation of pressure fields at the bottom of the ship, taking into account the impact of the bottom.
    Źródło:
    Hydroacoustics; 2010, 13; 17-24
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation study of hydrodynamic cavitation in the orifice flow
    Autorzy:
    Pietrykowski, Konrad
    Karpiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/38436947.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    cavitation
    CFD
    fluid flow
    hydrodynamics
    orifice
    simulation
    Opis:
    Hydrodynamic cavitation is a phenomenon that can be used in the water treatment process. For this purpose, venturis or orifices varying in geometry are used. Studying this phenomenon under experimental conditions is challenging due to its high dynamics and difficulties in measuring and observing the phase transition of the liquid. For this reason, the CFD method was used to study the phenomenon of hydrodynamic cavitation occurring in water flow through the orifice and then analyze flow parameters for different boundary conditions. The research was performed for four different orifice geometries and two defined fluid pressure values at the inlet, based on a computational 2D model of the research object created in Ansys Fluent software. As a result of the numerical simulation, the distribution of fluid velocity and pressure and volume fraction of the gas phase were obtained. A qualitative and quantitative analysis of the phenomenon of hydrodynamic cavitation under the considered flow conditions was conducted for the defined orifice geometries. The largest cavitation zone and thus the largest volume fraction of the gas phase was obtained for the orifice diameter of 2 mm with a sharp increase in diameter. However, the geometry with a linear change in diameter provided the largest volume fraction of the gas phase per power unit.
    Źródło:
    Applied Computer Science; 2022, 18, 3; 31-41
    1895-3735
    2353-6977
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrodynamics of Pilot Plant Scale Airlift Reactor in Presence of Alcohols
    Autorzy:
    Nandi, S.
    Jaju, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779781.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    air-lift reactor
    hydrodynamics
    gas hold-up
    bubble
    multiphase flow
    surfactant
    Opis:
    The overall gas hold-up of a pilot plant scale internal loop airlift reactor was studied in presence of different alcohols in varied concentration. It has been observed that these simple alcohols can enhance overall gas hold-up of the airlift assembly possibly due to formation of protective thin layer over smaller gas bubbles thereby reducing chance of their coalescence. As the alcohols can be used as food source for the micro organisms present in the system, this green and environment friendly process have potential to replace usage of hazardous surfactants often used for enhancing overall hold-up in order to obtain desired mass transfer characteristics. An empirical relationship encompassing overall gas hold-up of the reactor as a function of superficial gas velocity and alcohol concentration is also developed.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 118-123
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiphase flow mixture in 180[degrees] pipe bends
    Autorzy:
    Pietrzak, M.
    Witczak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/185343.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydrodynamics
    gas-liquid flow
    pipe bends
    hydrodynamika
    przepływ gazu i cieczy
    kolanko
    Opis:
    This paper presents the results of research regarding measurements of the values of pressure drops during horizontal flow of gas-liquid and gas-liquid-liquid mixture through 180o pipe bends. The conducted insightful analysis and assessment during multi-phase flow in pipe bends has enabled to develop a new method for determination of their values. This new method for determining pressure drops ensures higher precision of calculation in comparison to other methods presented in literature and can be applied for calculation of these parameters during multi-phase flows in pipe bends with various geometries.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 2; 227-239
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric sensitivity of a CFD model concerning the hydrodynamics of trickle-bed reactor (TBR)
    Autorzy:
    Janecki, D.
    Burghardt, A.
    Bartelmus, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/184944.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydrodynamics
    trickle-flow regime
    pressure gradient
    liquid holdup
    phases interaction
    CFD
    hydrodynamika
    gradient ciśnienia
    Opis:
    The aim of the present study was to investigate the sensitivity of a multiphase Eulerian CFD model with respect to relations defining drag forces between phases. The mean relative error as well as standard deviation of experimental and computed values of pressure gradient and average liquid holdup were used as validation criteria of the model. Comparative basis for simulations was our own data-base obtained in experiments carried out in a TBR operating at a co-current downward gas and liquid flow. Estimated errors showed that the classical equations of Attou et al. (1999) defining the friction factors Fjk approximate experimental values of hydrodynamic parameters with the best agreement. Taking this into account one can recommend to apply chosen equations in the momentum balances of TBR.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 1; 97-107
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza sposobów modelowania reaktora trójfazowego ze stałym złożem (TBR) z użyciem metod CFD
    Analysis of modelling of a three-phase fixed bed reactor using CFD procedures
    Autorzy:
    Janecki, D.
    Bartelmus, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073295.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    reaktor strużkowy
    model CFD
    hydrodynamika
    przepływy wielofazowe
    trickle-bed reactor
    CFD model
    hydrodynamics
    multiphase flow
    Opis:
    Przedstawiono zagadnienia związane z zastosowaniem modelu wielofazowego Eulera do modelowania reaktora trójfazowego ze złożem stacjonarnym (TBR). Analizując równania modelu wyselekcjonowano parametry, które obliczane są w oparciu o dane dostępne w literaturze, a następnie przeprowadzono analizę czułości modelu na zmianę wartości wyselekcjonowanych parametrów. Przeanalizowano wpływ zmian zależności opisujących siły wzajemnych oddziaływań pomiędzy fazami oraz promieniowej zmiany porowatości wypełnienia na wyniki obliczeń numerycznych.
    The paper presents issues connected with the use of Eulerian multiphase model for modelling a three-phase fixed-bed reactor (TBR). Param eters calculated on the basis of available in literature data were selected, and next the analysis of model sensitivity to the change of selected parameters was carried out. The influence of changes of relationships describing the interaction forces between phases and the change of radial porosity of packing on the results of numerical calculations was analyzed.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2018, 4; 95--96
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of process conditions associated with hydrodynamics of gas flow through materials with anisotropic internal structure
    Autorzy:
    Wałowski, G.
    Filipczak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/91960.pdf
    Data publikacji:
    2016
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    porous material
    char
    hydrodynamics
    gas flow
    anisotropy
    UCG
    materiał porowaty
    karbonizat
    hydrodynamika
    przepływ gazu
    anizotropia
    Opis:
    The results of experimental research concerning the assessment of the permeability of porous materials with respect to gas flow are presented in this paper. The conducted research applied to, among others, chars (acquired from the UCG thermal process) with an anisotropic gap-porous structure and - for comparative purposes - model materials such as pumice and polyamide agglomerates. The research was conducted with the use of a special test stand that enables the measuring of gas permeability with respect to three flow orientations compared with symmetric cubic-shaped samples. The research results show the explicit impact of the flow direction on the permeability of chars, which results from their anisotropic internal structures. The suitability of calculation methods employed to calculate the hydrodynamics of the gas flow through porous materials was also evaluated.
    Źródło:
    Journal of Sustainable Mining; 2016, 15, 4; 156-169
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy of Potential Flow Methods to Solve Real-time Ship-Tug Interaction Effects within Ship Handling Simulators
    Autorzy:
    Jayarathne, B. N.
    Ranmuthugala, D.
    Fei, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/117010.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    ship handling
    ship handling simulator
    hydrodynamics
    Computation Fluid Dynamics (CFD)
    potential flow
    ship-tug interaction
    real time
    hydrodynamic interaction effect
    Opis:
    The hydrodynamic interaction effects between two vessels that are significantly different in size operating in close proximity can adversely affect the safety and handling of these vessels. Many ship handling simulator designers implement Potential Flow (PF) solvers to calculate real-time interaction effects. However, these PF solvers struggle to accurately predict the complicated flow regimes that can occur, for example as the flow passes a wet transom hull or one with a drift angle. When it comes to predicting the interaction effects on a tug during a ship assist, it is essential to consider the rapid changes of the tug’s drift angle, as the hull acts against the inflow creating a complicated flow regime. This paper investigates the ability of the commercial PF solver, Futureship®, to predict the accurate interaction effects acting on tugs operating at a drift angle during ship handling operations through a case study. This includes a comparison against Computation Fluid Dynamics (CFD) simulations and captive model tests to examine the suitability of the PF method for such duties. Although the PF solver can be tuned to solve streamline bodies, it needs further improvement to deal with hulls at drift angles.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8 no. 4; 497-504
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of air-water oxygen transfer of cylindrical vortex flow regulators at a recirculating system
    Autorzy:
    Wójtowicz, P.
    Szlachta, M.
    Kotowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/208207.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydrodynamics
    storms
    vortex flow
    aeration efficiencies
    hydrodynamic flows
    oxygen mass transfer
    oxygen transfer rate
    recirculating system
    stormwater systems
    sewerage
    oxygen
    hydrodynamika
    burze
    wiry
    efektywność napowietrzania
    przepływy hydrodynamiczne
    przenoszenia masy tlenu
    szybkość transferu tlenu
    system recyrkulacji
    systemy deszczowe
    kanalizacja
    napowietrzanie
    Opis:
    Hydrodynamic flow regulators are used for diversion and/or limiting excess discharge in wastewater and stormwater systems as a replacement for traditional flow throttling devices. They are highly efficient, reliable and free from common disadvantages of traditional devices. Recent research of the authors indicated that atomization of a liquid by vortex flow regulators accelerates oxygenation and prevents the putrefaction process in wastewater and storm water collection systems. The study presents experimental results of the oxygen transfer measurements for basic designs of cylindrical hydrodynamic flow regulators in a closed-circuit experimental setup at the semi-commercial scale. The oxygen mass transfer coefficient, standard oxygen transfer rate and standard aeration efficiency were determined for the range of tested configurations by the clean water test.
    Źródło:
    Environment Protection Engineering; 2013, 39, 3; 207-215
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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