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Wyszukujesz frazę "Falicki, J." wg kryterium: Autor

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    Tytuł:
    Reynolds number effects in the flow of a Vočadlo electrorheological fluid in a curved gap
    Autorzy:
    Walicka, A.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264673.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    inertia effects
    fixed surfaces of revolution
    Vočadlo ER fluid
    pressurized flow
    bezwładność
    przepływ ciśnieniowy
    powierzchnia obrotowa
    Opis:
    Many electrorheological fluids (ERFs) as fluids with micro-structure demonstrate a non-Newtonian behaviour. Rheometric measurements indicate that some flows of these fluids may by modelled as the flows of a Vočadlo ER fluid. In this paper, the flow of a Vočadlo fluid – with a fractional index of non-linearity – in a narrow gap between two fixed surfaces of revolution with a common axis of symmetry is considered. The flow is externally pressurized and it is considered with inertia effect. In order to solve this problem the boundary layer equations are used. The Reynolds number effects (the effects of inertia forces) on the pressure distribution are examined by using the method of averaged inertia terms of the momentum equation. Numerical examples of externally pressurized flows in the gap between parallel disks and concentric spherical surfaces are presented.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 675-695
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure distribution in a squeeze film spherical bearing with rough surfaces lubricated by an ellis fluid
    Autorzy:
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/265779.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    łożyska
    równanie Reynoldsa
    model plastyczny
    pseudo-plastic model of Ellis fluid
    thrust curvilinear bearings
    modified Reynolds equation
    Opis:
    In this paper, the solution to a problem of pressure distribution in a curvilinear squeeze film spherical bearing is considered. The equations of motion of an Ellis pseudo-plastic fluid are presented. Using Christensen’s stochastic model of rough surfaces, different forms of Reynolds equation for various types of surface roughness pattern are obtained. The analytical solutions of these equations for the cases of externally pressurized bearing and squeeze film bearing are presented. Analytical solutions for the film pressure are found for the longitudinal and circumferential roughness patterns. As a result the formulae expressing pressure distribution in the clearance of bearing lubricated by an Ellis fluid was obtained. The numerical considerations for a spherical bearing are given in detail.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 593-610
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Curvilinear squeeze film bearing lubricated with a DeHaven fluid or with similar fluids
    Autorzy:
    Walicka, A.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264447.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    DeHaven fluid
    modified Reynolds equation
    squeeze film
    mechanical parameters of the bearing
    łożysko
    równanie Reynoldsa
    płyn nienewtonowski
    Opis:
    In the paper, the model of a DeHaven fluid and some other models of non-Newtonian fluids, in which the shear strain rates are known functions of the powers of shear stresses, are considered. It was demonstrated that these models for small values of material constants can be presented in a form similar to the form of a DeHaven fluid. This common form, called a unified model of the DeHaven fluid, was used to consider a curvilinear squeeze film bearing. The equations of motion of the unified model, given in a specific coordinate system are used to derive the Reynolds equation. The solution to the Reynolds equation is obtained by a method of successive approximations. As a result one obtains formulae expressing the pressure distribution and load-carrying capacity. The numerical examples of flows of the unified DeHaven fluid in gaps of two simple squeeze film bearings are presented.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 697-715
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flows of DeHaven fluid in symmetrically curved capillary fissures and tubes
    Autorzy:
    Walicka, A.
    Falicki, J.
    Jurczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/265359.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ laminarny
    rurka kapilarna
    szczelina kapilarna
    DeHaven fluid
    laminar flow
    symmetrically corrugated capillaries
    capillary fissures or tubes
    Opis:
    In this paper, an analytical method for deriving the relationships between the pressure drop and the volumetric flow rate in laminar flow regimes of DeHaven type fluids through symmetrically corrugated capillary fissures and tubes is presented. This method, which is general with regard to fluid and capillary shape, can also be used as a foundation for different fluids, fissures and tubes. It can also be a good base for numerical integration when analytical expressions are hard to obtain due to mathematical complexities. Five converging-diverging or diverging-converging geometrics, viz. variable cross-section, parabolic, hyperbolic, hyperbolic cosine and cosine curve, are used as examples to illustrate the application of this method. Each example is concluded with a presentation of the formulae for the velocity flow on the outer surface of a thin porous layer. Upon introduction of hindrance factors, these formulae may be presented in the most general forms.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 521-550
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inertia and couple-stress effects in a curvilinear thrust hydrostatic bearing
    Autorzy:
    Walicka, A.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/266178.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    couple-stress lubricant
    inertia effects
    hydrostatic thrust bearing
    efekt bezwładności
    łożysko oporowe
    smar
    Opis:
    The flow of a couple-stress lubricant in a clearance of a curvilinear thrust hydrostatic bearing with impermeable walls is considered. The flow in the bearing clearance is considered with inertia forces. The equations of motion are solved by an averaged inertia method. As a result, the formulae for pressure distributions without and with inertia effects were obtained. Radial thrust bearings and spherical bearings are discussed as numerical examples. It is shown that inertia effects influence the bearing performance considerably.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 759-767
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rheology of drugs for topical and transdermal delivery
    Autorzy:
    Walicka, A.
    Falicki, J.
    Iwanowska-Chomiak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/947354.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    leki
    model reologiczny
    skóra ludzka
    drug delivery
    human skin
    drug rheology
    rheological models
    Opis:
    Skin drug delivery systems are a constant source of interest because of the benefits that they offer to overcome many drawbacks associated with other modes of drug delivery (i.e. oral, intravenous, etc.). Because of the impermeable nature of the skin, designing a suitable drug delivery vehicle that penetrates the skin barrier is challenging. Skin drug delivery can be subdivided into topical and transdermal (Fig.1). In a topical administration the drug is intended to act at skin level, this is indicated for the treatment of skin diseases. The aim of transdermal administration is getting a systemic release and in this case the skin represents a barrier not a target. The availability of drugs or other active substances through the skin depends basically on two consecutive steps: the release of these drugs or substances from vehicle or carrier and their subsequent permeation through the skin. Hence, studies on the specific properties of vehicles or carriers, such as their rheological behaviours, are of great interest in the field of pharmaceutical products. The objective of the present study is to systematically characterize a nonlinear rheological behaviour and flow properties of drugs and drug carriers into topical and transdermal administration. To this aim, one- and threedimensional rheological models are presented, which may be used to describe drug release through the skin and through the extracellular and interstitial matrix structures. Finally, the rheological measurements of some commercial creams and ointments were made.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 179-198
    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:
    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:
    Thrust bearing with rough surfaces lubricated by an Ellis fluid
    Autorzy:
    Walicka, A.
    Walicki, E.
    Jurczak, P.
    Falicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/955249.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    płyn pseudoplastyczny
    model Ellisa
    łożysko oporowe
    chropowatość
    pseudo-plastic fluid
    Ellis model
    thrust bearing
    Christensen roughness
    Opis:
    In the paper the influence of bearing surfaces roughness on the pressure distribution and load-carrying capacity of a thrust bearing is discussed. The equations of motion of an Ellis pseudo-plastic fluid are used to derive the Reynolds equation. After general considerations on the flow in a bearing clearance and using the Christensen theory of hydrodynamic rough lubrication the modified Reynolds equation is obtained. The analytical solutions of this equation for the cases of a squeeze film bearing and an externally pressurized 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; 809-822
    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
      Wyświetlanie 1-10 z 10

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