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    Wyświetlanie 1-3 z 3
    Tytuł:
    Liquid bridge in slit pore geometry
    Autorzy:
    Hu, Junhui
    Wu, Mengjiao
    Bai, Kezhao
    Yang, Li
    Powiązania:
    https://bibliotekanauki.pl/articles/1839700.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    liquid bridge
    slit, pinning angle
    critical aspect ratio
    saddle shape
    Opis:
    In this work, the morphology of a liquid bridge in a slit pore geometry was investigated as a function of both the bridge height and aspect ratio (height/width). The end contour interface of the liquid bridge was modeled by using a saddle shape, and the liquid-air interface was described via an arc of a circle. By employing the free energy approach, a simple formula was obtained to predict variation of the pinning angle as a function of the distance between the slits. The pinning angle depended on the liquid volume and on both the wetting properties and the geometry of the system (height and width). The critical aspect ratio at which the liquid bridge meniscus transitioned from concave to convex was determined. The calculations were in good agreement with the experimental data. The morphology of the liquid bridges in a slit pore geometry can be used in various fields such as the packaging of electronic and micro-electromechanical systems.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2021, 59, 1; 135-142
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the critical velocity of a straight wing with a high aspect ratio
    Autorzy:
    Thanh, Le Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/45423968.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    prędkość krytyczna
    aerodynamika
    pręt
    thin rod
    divergence
    linear aerodynamics
    straight wing
    high aspect ratio
    critical velocity
    Opis:
    An aerodynamic problem on an air flow around a large aspect ratio rectangular wing is investigated in this study. According to the theory of Vlasov, the wing is considered to be a thin rod. External loads are assumed to be proportional to the airfoil angle of attack related to the dimensionless coefficient of the lift and the pitching moment coefficient. These coefficients depend on the airfoil parameters and the Mach number M and are determined by experimental measurements for subsonic and supersonic velocities. In this case, to define the unstable cases of the wing, one bases on the Lyapunov stability theory. Equations of bending and torsional free vibrations have resulted. Based on the analysis of natural frequencies (eigenfrequencies), it is possible to determine the changing positions of the real part and the imaginary part of the characteristic equation solution. These positions can cause instabilities for the wing such as torsional divergence and flutter.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2023, 28, 1; 105-117
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical nature of a single walled carbon nanotube using Legendre’s polynomials
    Autorzy:
    Tiwari, P.
    Nagar, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/279475.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Euler-Bernoulli’s beam theory
    nonlocal elasticity theory
    Legendre’s polynomial
    aspect ratio
    critical buckling load
    Winkler and Pasternak elastic constants
    Opis:
    This paper is concerned with the mechanical response of a single-walled carbon nanotube. Euler-Bernoulli’s beam theory and Hamilton’s principle are employed to derive the set of governing differential equations. An efficient variational method is used to determine the solution of the problem and Legendre’s polynomials are used to define basis functions. Significance of using these polynomials is their orthonormal property as these shape functions convert mass and stiffness matrices either to zero or one. The impact of various parameters such as length, temperature and elastic medium on the buckling load is observed and the results are furnished in a uniform manner. The degree of accuracy of the obtained results is verified with the available literature, hence illustrates the validity of the applied method. Current findings show the usage of nanostructures in vast range of engineering applications. It is worth mentioning that completely new results are obtained that are in validation with the existing results reported in literature.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1153-1162
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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