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    Wyświetlanie 1-14 z 14
    Tytuł:
    Wytwarzanie warstw porowatych przy użyciu mikrospawania
    Preparation of porous layers using microwelding
    Autorzy:
    Depczyński, W.
    Młynarczyk, P.
    Spadło, S.
    Ziach, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/252453.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    warstwa porowata
    mikrospawanie
    porous layer
    microwelding
    Opis:
    Celem pracy było zapoznanie się z metodą mikrospawania opornościowo-impulsowego oraz zaznajomienie się z właściwościami i mikrostrukturą porowatych warstw wierzchnich. Został również dokonany dobór materiału podłoża stali S235JR oraz materiałów napawanych, którymi były pa-sty wykonane z oleju silikonowego oraz mieszanin proszków żelaza: NC 100.24, ASC 100.29, Distaloy SE z tlenkiem żelaza (Fe2O3) i miedzią (Cu). Po przygotowaniu materiałów nastąpił dobór właściwych parametrów mikrospawania. W celu wytworzenia porowatej warstwy wierzchniej na stali zastosowano napawanie metodą mikrospawania opornościowo-impulsowego z wykorzystaniem urządzenia do mikrospawania WS7000S firmy SST France & Vision Lasertechnik.
    The aim of this study was to examine method of resistance microwelding and familiarization with the properties and microstructure of porous surface layers made using this method. The selection of the substrate material (S235JR steel) and welded materials, which were pastes made of silicone oil and iron powders (NC 100.24, ASC 100.29, Distaloy SE) with Fe2O3 and Cu powders addition was made. After selecting the materials the choice of appropriate microwelding parameters was made.
    Źródło:
    TTS Technika Transportu Szynowego; 2015, 12; 378-380, CD
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed convection heat transfer of a nanofluid in a square ventilated cavity separated horizontally by a porous layer and discrete heat source
    Autorzy:
    Messaoud, Hamdi
    Adel, Sahi
    Ouerdia, Ourrad
    Powiązania:
    https://bibliotekanauki.pl/articles/27312228.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    mixed convection
    vented cavity
    porous layer
    finite volume method
    Opis:
    Laminar mixed convection heat transfer in a vented square cavity separated by a porous layer filled with different nanofluids (Fe3O4, Cu, Ag and Al2O3) has been investigated numerically. The governing equations of mixed convection flow for a Newtonian nanofluid are assumed to be two-dimensional, steady and laminar. These equations are solved numerically by using the finite volume technique. The effects of significant parameters such as the Reynolds number (10 ≤ Re ≤ 1000), Grashof number (103 ≤ Gr ≤ 106 ), nanoparticle volume fraction (0.1 ≤ φ ≤ 0.6), porous layer thickness (0 ≤ γ ≤ 1) and porous layer position (0.1 ≤ δ ≤ 0.9) are studied. Numerical simulation details are visualized in terms of streamline, isotherm contours, and average Nusselt number along the heated source. It has been shown that variations in Reynolds and Darcy numbers have an impact on the flow pattern and heat transfer within a cavity. For higher Reynolds (Re > 100), Grashof (Gr > 105 ) numbers and nanoparticles volume fractions the heat transfer rate is enhanced and it is optimal at lower values of Darcy number (Da = 10−5 ). In addition, it is noticed that the porous layer thickness and location have a significant effect on the control of the heat transfer rate inside the cavity. Furthermore, it is worth noticing that Ag nanoparticles presented the largest heated transfer rate compared to other nanoparticles.
    Źródło:
    Archives of Thermodynamics; 2023, 44, 2; 87--114
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemically reacting Jeffrey fluid flow over a deformable porous layer with entropy generation analysis
    Autorzy:
    Das, Utpal Jyoti
    Powiązania:
    https://bibliotekanauki.pl/articles/2174171.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    odkształcenie
    warstwa porowata
    dyfuzja termiczna
    deformable porous layer
    Jeffrey fluid
    entropy generation
    Bejan number
    thermal diffusion
    Opis:
    Entropy generation of a steady Jeffrey fluid flow over a deformable vertical porous layer is analysed with consideration of a first-order chemical reaction and thermal diffusion. The porous material is modelled as a homogeneous binary mixture of fluid and solid phases where each point in the binary mixture is occupied concurrently by the fluid and solid. The combined phenomenon of solid deformation and fluid movement is taken into account. The impact of relevant parameters on the fluid velocity, solid displacement, temperature and concentration profiles is discussed. It is noticed that the Jeffrey fluid parameter enhances the entropy generation number, fluid velocity and solid displacement profiles, but a reverse effect is seen for the Bejan number. Further, entropy generation, fluid velocity and solid displacement reduce due to the higher estimates of the chemical reaction parameter, while the Bejan number enhances.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 36--48
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the flow through porous layers composed of converging-diverging capillary fissures or tubes
    Autorzy:
    Walicka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/266040.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ laminarny
    warstwa porowata
    rurki kapilarne
    laminar flow
    symmetrically corrugated capillaries
    capillary fissures
    capillary tubes
    porous layer
    Opis:
    In this paper, a porous medium is modelled by a network of converging-diverging capillaries which may be considered as fissures or tubes. This model makes it necessary to consider flows through capillary fissures or tubes. Therefore an analytical method for deriving the relationships between pressure drops, volumetric flow rates and velocities for the following fluids: Newtonian, polar, power-law, pseudoplastic (DeHaven and Sisko types) and Shulmanian, was developed. Next, considerations on the models of pore network for Newtonian and non-Newtonian fluids were presented. The models, similar to the schemes of central finite differences may provide a good basis for transforming the governing equations of a flow through the porous medium into a set of linear or quasi-linear algebraic equations. It was shown that the some coefficients in these algebraic equations depend on the kind of the capillary convergence.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 161-185
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porous squeeze film bearing with rough surfaces lubricated by a Bingham fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/955251.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn lepkosprężysty
    model Binghama
    łożysko oporowe
    warstwa porowata
    viscoplastic fluid
    Bingham model
    thrust bearing
    porous layer
    Christensen roughness
    Opis:
    In the paper the effect of both bearing surfaces and the porosity of one bearing surface on the pressure distribution and load-carrying capacity of a squeeze film bearing is discussed. The equations of motion of a Bingham fluid in a bearing clearance and in a porous layer are presented. Using the Morgan-Cameron approximation and Christensen theory of rough lubrication the modified Reynolds equation is obtained. The analytical solutions of this equation for a squeeze film bearing are presented. As a result one obtains the formulae expressing pressure distribution and load-carrying capacity. A thrust radial bearing is considered as a numerical example.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 795-808
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Curvilinear squeeze film bearing with porous wall lubricated by a Rabinowitsch fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/266104.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    non-Newtonian fluid
    Rabinowitsch model
    curvilinear squeeze film bearing
    porous layer
    płyn nieniutonowski
    model Rabinowitscha
    łożysko ślizgowe
    warstwa porowata
    Opis:
    The present theoretical analysis is to investigate the effect of non-Newtonian lubricant modelled by a Rabinowitsch fluid on the performance of a curvilinear squeeze film bearing with one porous wall. The equations of motion of a Rabinowitsch fluid are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and in a porous layer using the Morgan-Cameron approximation the modified Reynolds equation is obtained. The analytical solution of this equation for the case of a squeeze film bearing is presented. As a result one obtains the formulae expressing pressure distribution and load-carrying capacity. Thrust radial bearing and spherical bearing with a squeeze film are considered as numerical examples.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 427-441
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of wall porosity and surfaces roughness on the steady performance of an externally pressurized hydrostatic conical bearing lubricated by a Rabinowitsch fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264399.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pseudo-plastic fluid
    Rabinowitsch model
    curvilinear and conical thrust bearings
    porous layer
    Christensen roughness
    łożysko oporowe
    warstwa porowata
    model Rabinowitscha
    Opis:
    In the paper, the influence of both the bearing surfaces roughness as well as porosity of one bearing surface on the pressure distribution and load-carrying capacity of a curvilinear, externally pressurized, thrust bearing is discussed. The equations of motion of a pseudo-plastic Rabinowitsch fluid are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and in a porous layer using the Morgan-Cameron approximation and Christensen theory of hydrodynamic lubrication with rough bearing surfaces the modified Reynolds equation is obtained. The analytical solution is presented; as a result one obtains the formulae expressing the pressure distribution and load-carrying capacity. Thrust radial and conical bearings, externally pressurized, are considered as numerical examples.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 717-737
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thrust porous bearing with rough surfaces lubricated by a rotem-shinnar fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/387536.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    pseudo-plastic fluid
    rotem-shinnar model
    thrust bearing
    porous layer
    Christensen roughness
    płyn pseudoplastyczny
    łożysko oporowe
    warstwa porowata
    teoria Christensena
    model Rotem-Shinnar
    Opis:
    In the paper the influence of both bearing surfaces roughness and porosity of one bearing surface on the pressure distribution and load-carrying capacity of a thrust bearing surfaces is discussed. The equations of motion of a pseudo-plastic fluid of Rotem-Shinnar, are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and in a porous layer using the Morgan-Cameron approximation and Christensen theory of hydrodynamic lubrication the modified Reynolds equation is obtained. The analytical solutions of this equation for the cases of squeeze film bearing and externally pressurized bearing are presented. As a result one obtains the formulae expressing pressure distribution and load-carrying capacity. Thrust radial bearing with squeezed film is considered as a numerical example.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 1; 50-55
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deposition of a polymeric porous superhydrophobic thin layer on the surface of poly(vinylidenefluoride) hollow fiber membrane
    Autorzy:
    Ahmad, A. L.
    Mohammed, H. N.
    Ooi, B. S.
    Leo, C. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/778912.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Superhydrophobic layer
    PVDF
    Gas-liquid contactor
    CO2
    porous
    Opis:
    Porous superhydrophobic layer of low-density polyethylene (LDPE) was created by a simple approach on the Poly(vinylidenefluoride) (PVDF) hollow fiber membranes. Acetone and ethanol mixtures with different volume ratios were used as the non-solvent on the coating surface. A 5:1 (v/v) acetone/ethanol ratio provided a porous surface with a 152° ± 3.2 water contact angle. The high contact angle could reduce membrane wettability for better carbon dioxide capture when the membrane was used as gas-liquid contactor in absorption processes. To assess the effect of the created superhydrophobic layer, the pristine and modified membranes were tested in a CO2 absorption system for ten days. The results revealed that the absorption flux in the modified membrane was higher than that of pristine membrane.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 3; 1-6
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of Designing a Distortion Gauze for Testing a Boundary Layer Ingesting Fan
    Autorzy:
    Kwiatkowski, Tomasz
    Sieradzki, Adam
    Łukasik, Borys
    Powiązania:
    https://bibliotekanauki.pl/articles/36453739.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    boundary layer ingestion
    distortion gauze
    porous media
    distorted velocity profile
    Opis:
    As global trends aim to reduce emissions of pollutants, boundary layer ingesting (BLI) propulsions are attracting more and more attention. As such, N+2 generation aircraft with propulsion placed in the aft of the aircraft are gaining in popularity. The boundary layer is formed on the fuselage before entering the engine located in the aft of the aircraft. Due to significant difficulties in performing experimental tests of BLI propulsors with full-size aircraft, distortion gauzes are one of the methods to provide the desired air velocity profile at the inlet. This paper describes a novel method of designing such gauzes, a topic which is not well covered in the existing literature. In the first stage of the presented method, single orifices of different sizes were calculated using CFD tools. The relationship between their size and the gauze resistance coefficient was identified, making it possible to model the distortion gauze using porous media. An iterative approach was used to design a gauze that meets the requirements. This is, to our knowledge, the first distortion gauze design description where a porous media model has been used. Experimental tests demonstrated that the produced distortion gauze yields a velocity profile comparable to the desired one. This indicates the great potential of using the presented approach in further research on boundary layer ingesting propulsions. It offers an opportunity to reduce substantially both the costs of experimental research and the time required to design a distortion-tolerant fan.
    Źródło:
    Transactions on Aerospace Research; 2022, 1 (266); 1-17
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Krzemowe warstwy epitaksjalne do zastosowań fotowoltaicznych osadzane na krzemie porowatym
    Silicon epitaxial layers deposited on porous silicon for photovoltaic applications
    Autorzy:
    Lipiński, D.
    Sarnecki, J.
    Brzozowski, A.
    Mazur, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/192080.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
    Tematy:
    warstwa epitaksjalna
    CVD
    krzem porowaty
    ogniwo słoneczne
    epitaxial layer
    porous silicon
    solar cell
    Opis:
    Ustalono warunki wytwarzania warstw o odpowiedniej porowatości zapewniającej osadzanie w procesie epitaksji z fazy gazowej warstw krzemowych o grubości powyżej 50 μm. W zależności od rezystywności płytek krzemowych typu p+ o orientacji <111> oraz <100> określono związek między gęstością prądu trawienia elektrochemicznego, a porowatością wytworzonych warstw porowatych. Otrzymano warstwy porowate z porowatością w zakresie 5 % - 70 %. Ustalono parametry procesu epitaksji i osadzono krzemowe warstwy epitaksjalne o wysokiej perfekcji strukturalnej i zakładanych parametrach elektrycznych.
    The conditions for producing layers with proper porosity that allows epitaxial growth of Si layers with the thickness of about 50 μm have been established. The relationship between the layer porosity, current density and substrate resistivity has been determined. The layers with porosity in the range between 5 % and 70 % have been obtained. The parameters of the CVD process have been established. Epitaxial silicon layers of high structural perfection and required electrical parameters have been obtained, which has been confirmed by the XRD and SR measurements as well as SEM observations.
    Źródło:
    Materiały Elektroniczne; 2012, T. 40, nr 3, 3; 28-37
    0209-0058
    Pojawia się w:
    Materiały Elektroniczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda otrzymywania monokrystalicznych folii krzemowych z wykorzystaniem krzemu porowatego
    A method of obtaining monocrystalline silicon foils using porous silicon
    Autorzy:
    Sarnecki, J.
    Brzozowski, A.
    Lipiński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/192437.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
    Tematy:
    warstwa epitaksjalna
    krzem porowaty
    CVD
    folia krzemowa
    epitaxial layer
    porous silicon
    silicon foil
    Opis:
    Określono warunki i opracowano metodę otrzymywania folii krzemowych o grubości do ~ 100 μm i wymiarach 50 x 50 mm. Metoda ta polega na odrywaniu warstw epitaksjalnych osadzanych na porowatej powierzchni płytki krzemowej typu p+. Opracowano oryginalną metodę odrywania warstwy epitaksjalnej łączącą działanie obniżonego ciśnienia i kąpieli w gorącej wodzie.
    A method of obtaining silicon foil with the thickness of up to 100 μm and dimensions 50 x 50 mm was worked out and experimental conditions were determined. This technique consists in the separation of epitaxial layers deposited on the porous surface of the p+ silicon wafer. Such an original method of epitaxial layer separation, combining the effect of low pressure and a bath in hot water, was developed.
    Źródło:
    Materiały Elektroniczne; 2014, T. 42, nr 1, 1; 24-31
    0209-0058
    Pojawia się w:
    Materiały Elektroniczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow and heat transfer at a nonlinearly shrinking porous sheet: the case of asymptotically large powerlaw shrinking rates
    Autorzy:
    Prasad, K. V.
    Vajravelu, K.
    Pop, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/265012.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    warstwa graniczna przepływu
    metoda Keller-Box
    przenikanie ciepła
    boundary layer flow
    porous shrinking sheet
    Keller-box method
    similarity solutions
    heat transfer
    Opis:
    The boundary layer flow and heat transfer of a viscous fluid over a nonlinear permeable shrinking sheet in a thermally stratified environment is considered. The sheet is assumed to shrink in its own plane with an arbitrary power-law velocity proportional to the distance from the stagnation point. The governing differential equations are first transformed into ordinary differential equations by introducing a new similarity transformation. This is different from the transform commonly used in the literature in that it permits numerical solutions even for asymptotically large values of the power-law index, m. The coupled non-linear boundary value problem is solved numerically by an implicit finite difference scheme known as the Keller- Box method. Numerical computations are performed for a wide variety of power-law parameters (1 < m < 100,000) so as to capture the effects of the thermally stratified environment on the velocity and temperature fields. The numerical solutions are presented through a number of graphs and tables. Numerical results for the skin-friction coefficient and the Nusselt number are tabulated for various values of the pertinent parameters.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 779-791
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed convection in the stagnation-point flow over a vertical stretching sheet in the presence of thermal radiation
    Autorzy:
    Manjunatha, S.
    Gireesha, B. J.
    Bagewadi, C. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/265508.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    boundary layer flow
    stretching porous surface
    mixed convective parameter
    thermal radiation
    numerical solution
    dusty fluid
    free stream velocity
    przepływ warstwowy
    powierzchnia porowata
    promieniowanie cieplne
    Opis:
    An unsteady two-dimensional stagnation-point mixed convection flow of a viscous, incompressible dusty fluid towards a vertical stretching sheet has been examined. The stretching velocity and the free stream velocity are assumed to vary linearly with the distance from the stagnation point. The problem is analyzed using similarity solutions. The similarity ordinary differential equations were then solved numerical by using the RKF-45 method. The effects of various physical parameters on the velocity profile and skin-friction coefficient are also discussed in this paper. Some important findings reported in this work reveal that the effect of radiation has a significant impact on controlling the rate of heat transfer in the boundary layer region.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 871-888
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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