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    Wyświetlanie 1-9 z 9
    Tytuł:
    Arching behaviour of cohesive powders in a pilot-scale plane-flow silo
    Autorzy:
    Berry, R.J.
    Birks, A.H.
    Bradley, M.S.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955761.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    plane-flow silo
    variable geometry hopper
    filling condition
    arch shape
    critical arch dimension
    Opis:
    The paper records some of the results and observations from a pilot scale plane-flow silo with a variable geometry hopper and a fully width slot outlet. The original objectives were simply to study the shape of arches and their failure mechanisms under a range of conditions. However, the behaviour of arches did not conform to the conventional assumptions and neither did other silo behaviour. The paper contains a summary of the main findings of this work, but concentrates on the arches formed under mass-flow and non-mass-flow geometries for the filling condition.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 479-498
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiary parametrów przepływu wokół układu dwóch prostokątów
    The measurement of properties for flow around rectangulars
    Autorzy:
    Błazik-Borowa, E.
    Bęc, J.
    Lipecki, T.
    Nowicki, T.
    Szulej, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/362557.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Fizyki Budowli Katarzyna i Piotr Klemm
    Tematy:
    tunel aerodynamiczny
    przepływ płaski
    ciśnienie
    pole prędkości
    wind tunnel
    plane flow
    pressure
    velocity field
    Opis:
    Praca dotyczy badań opływu wokół układu dwóch prostopadłościanów, ustawionych w tunelu aerodynamicznym w taki sposób, aby przepływ w środku ich przekroju mógł być traktowany jako płaski. Wynikiem pomiarów są rozkłady ciśnienia na modelach oraz pola prędkości średnich i ich fluktuacji.
    The paper is devoted the measurement of flow properties in the wind tunnel. The research deals with the flow around the set of two rectangular cylinders. The flow at middle of cylinders is treated as two-dimensional one. The measurement results are pressure distributions and velocity fields around models.
    Źródło:
    Fizyka Budowli w Teorii i Praktyce; 2009, T. 4; 11-18
    1734-4891
    Pojawia się w:
    Fizyka Budowli w Teorii i Praktyce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Determination of the Effect of Floats on Aerodynamic Characteristics of the “OSA” Aircraft in Asymmetric Flow
    Autorzy:
    Frant, Michał
    Wrzesień, Stanisław
    Majcher, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2073838.pdf
    Data publikacji:
    2022
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    mechanical engineering
    aerodynamic characteristics
    wind tunnel
    plane model flow
    Opis:
    This study provides the results of experimental tests of the effect of floats on the aerodynamic characteristics of the “OSA” plane in an asymmetric flow. The tests were carried out in a low-speed wind tunnel owned by Institute of Aviation Technology, Faculty of Mechatronics, Armament and Aerospace (FMAA), Military University of Technology (MUT, Warsaw, Poland). The model of “OSA” was tested at dynamic pressure q = 500 Pa within the range of slip angles β = -28°÷28°. The tests were carried out for the plane model in the so-called “plain” configuration, i.e. at non-deflected control surfaces and wing mechanisation elements. The model was tested in two variants – with floats and without floats. The effect of deflection of the flaps, ailerons and rudder on the aerodynamic characteristics of the test model was also examined. The obtained values of drag coefficient, lateral force coefficient and yawing moment coefficient are presented in the form of tables and graphs. The tests showed that the floats had a significant impact on the curves of the characteristics. They result in a considerable increase of the value of the drag coefficient and in a deterioration of weathercock stability.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2022, 13, 1 (47); 27--44
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dobór warunków brzegowych ciśnienia w metodzie k-ε
    The choice of boundary conditions of the k-ε method for pressure
    Autorzy:
    Błazik-Borowa, E.
    Podgórski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/362854.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Fizyki Budowli Katarzyna i Piotr Klemm
    Tematy:
    pole ciśnienia
    przepływ płaski
    metoda k-ε
    opływ kwadratu
    field of pressure
    plane flow
    k-ε method
    flow round of the square
    Opis:
    Praca dotyczy interpretacji wyników obliczeń, oraz analizy wpływu doboru warunków brzegowych na rozkład ciśnienia na krawędziach kwadratu przy opływie 2D. Analizowane są problemy napływu ze stałą prędkością oraz napływu o prędkości zmiennej wzdłuż wysokości domeny obliczeniowej.
    The paper deals with the interpretation of calculation results for a pressure and the analysis of the influence of boundary conditions on pressure distribution at walls of a square in 2D flow. The analysis concerns the problems for the constant velocity inflow and the inflow with the profile velocity.
    Źródło:
    Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 1, 1; 5-10
    1734-4891
    Pojawia się w:
    Fizyka Budowli w Teorii i Praktyce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure in slide journal plane bearing by laminar unsteady oil flow
    Autorzy:
    Krasowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/247887.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    journal plane bearing
    lubrication
    unsteady laminar oil flow
    pressure distribution
    Opis:
    This paper shows results of numerical solutions a modified Reynolds equation for laminar unsteady oil flow in slide journal plane bearing gap. It shows a preliminary analysis of pressure distribution change in the bearing by laminar, unsteady lubrication caused by velocity perturbations of oil flow in the longitudinal direction of a bearing. Described effect can be used as an example of modelling the bearing friction node operations in reciprocating movement during exploitation of engines and machines. Plane crossbar journal bearing occur in ship combustion engine as a crosshead bearing. During modelling crossbar bearing operations in combustion engines, bearing movement perturbations from engine vertical vibrations causes velocity flow perturbations of lubricating oil on the bearing race and on the bearing slider in the longitudinal direction. Engine forced vertical vibrations frequency and crankshaft forced torsional vibrations is determined by shaft rotational speed, engine cylinder number and by engine type. This solution example applies to isothermal bearing model with infinity length. Lubricating oil used in this model has Newtonian properties and dynamic viscosity in dependence on pressure. Results are presented in the dimensionless hydrodynamicpressure diagrams.
    Źródło:
    Journal of KONES; 2007, 14, 3; 297-303
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Capacity forces in slide journal plane bearing by laminar unsteady lubrication
    Autorzy:
    Krasowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/247548.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    journal plane bearing
    lubrication
    unsteady laminar oil flow
    pressure distribution
    capacity forces
    Opis:
    This paper shows results of numerical solutions an modified Reynolds equations for laminar unsteady oil flow in slide journal bearing with planar linear gap. Discussed case of the solution to the Reynolds equation for the unsteady laminar Newtonian flow of lubricating factor allows initial estimation of hydrodynamic pressure distribution and its capacity as a basic operational parameter of the slide bearing. Unsteady axial velocity perturbation on the race surface and slide has influence on the hydrodynamic pressure distribution of the capacity of the lubricated gap. Pressure changes in the bearing are seasonal and equal to the lasting period of velocity perturbation. The level of changes and its nature depends on the kind of perturbation. This solution example applies to isothermal bearing model with infinity length. Lubricating oil used in this model has Newtonian properties and dynamic viscosity in dependence on pressure. It shows a preliminary analysis change of capacity forces in the bearing by laminar, unsteady lubrication caused by velocity perturbations of oil flow in the longitudinal direction of a bearing. Described effect can be used as an example of modeling the bearing friction node operations in reciprocating movement during exploitation of engines and machines. Plane crossbar journal bearing occur in ship combustion engine as a crosshead bearing. Results are presented in the dimensionless hydrodynamic pressure and capacity force diagrams.
    Źródło:
    Journal of KONES; 2008, 15, 3; 245-252
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic parameters of soil failure criteria for plane strain conditions – experimental and semi-theoretical study
    Autorzy:
    Sławińska-Budzich, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1845147.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    soil failure criteria
    soil peak strength
    plane strain conditions
    true triaxial apparatus
    plastic flow rule
    Opis:
    The paper concerns the characteristic parameters of the selected isotropic failure criteria, i.e. Mohr–Coulomb, Drucker–Prager, Matsuoka–Nakai and Lade–Duncan. The parameters are determined directly from the failure criteria and stress measurements or by semi-theoretical approach, assuming that the soil obeys the associated flow rule and using the plane strain condition. In the latter case, the parameters can be expressed as functions of the plane strain internal friction angle, which is determined from measurements. The principal stress tensor components, corresponding to the soil peak strength and necessary to obtain the failure criteria parameters, are measured in a series of true triaxial, plane strain tests, on coarse Skarpa sand samples of different initial relative density, subjected to various confining pressures.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 3; 237-254
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal radiation and chemical reaction effects on unsteady magnetohydrodynamic third grade fluid flow between stationary and oscillating plates
    Autorzy:
    Idowu, A. S.
    Sani, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/265001.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ Couette'a
    przepływ magnetohydrodynamiczny
    promieniowanie cieplne
    reakcja chemiczna
    third grade fluid
    plane Couette
    Couette-Poiseuille flow
    magnetohydrodynamic flow
    stationary and oscillating plate
    thermal radiation
    chemical reaction
    Opis:
    An analysis was carried out for an unsteady magnetohydrodynamic (MHD) flow of a generalized third grade fluid between two parallel plates. The fluid flow is a result of the plate oscillating, moving and pressure gradient. Three flow problems were investigated, namely: Couette, Poiseuille and Couette-Poiseuille flows and a number of nonlinear partial differential equations were obtained which were solved using the He-Laplace method. Expressions for the velocity field, temperature and concentration fields were given for each case and finally, effects of physical parameters on the fluid motion, temperature and concentration were plotted and discussed. It is found that an increase in the thermal radiation parameter increases the temperature of the fluid and hence reduces the viscosity of the fluid while the concentration of the fluid reduces as the chemical reaction parameter increases.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 269-293
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    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
      Wyświetlanie 1-9 z 9

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