Sfoglia per Soggetto "INSTABILITIES"
Items 1-15 di 15
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Buckling and post-buckling of long pressurized elastic thin-walled tubes under in-plane bending
(2006)The present paper focuses on the structural stability of long uniformly pressurized thin elastic tubular shells subjected to in-plane bending. Using a special-purpose non-linear finite element technique, bifurcation on the ... -
Experimental evidence for a short-wave global mode in film flow along periodic corrugations
(2013)The primary instability of liquid film flow along periodically corrugated substrates is studied experimentally. Two different wall shapes, of the same wavelength and height, are tested for a wide range of inclinations. It ... -
Experiments on laminar film flow along a periodic wall
(2002)Experimental results are reported on the structure of gravity-driven film flow along an inclined periodic wall with rectangular corrugations. A fluorescence imaging method is used to capture the evolution of film height ... -
Measurements of liquid film flow as a function of fluid properties and channel width: Evidence for surface-tension-induced long-range transverse coherence
(2011)We study experimentally the influence of the transverse dimension on film flow in relatively wide channels with sidewalls. Large deviations from two-dimensional predictions are observed in the primary instability and in ... -
Nominally two-dimensional waves in inclined film flow in channels of finite width
(2010)Traveling waves in inclined film flow in channels of finite width are never truly two-dimensional (2D) because of a long-range effect of sidewalls The present study documents the characteristics of the first waves that are ... -
Nonlinear dynamics of inclined films under low-frequency forcing
(2004)The evolution of an inclined liquid film, subjected to regular inlet disturbances of small frequency, f, is studied experimentally and computationally. The fluorescence imaging method is used to quantitatively document ... -
Nonlinear interaction between a boundary layer and a liquid film
(2009)The nonlinear stability of a laminar boundary layer that flows at high Reynolds number (Re) above a plane surface covered by a liquid film is investigated. The basic flow is considered to be nearly parallel and the simulations ... -
A numeric-symbolic approach to the problem of localization of plastic flow
(2001)A method combining numerical and symbolic computations is presented for deciding whether or not a mechanical state given numerically in terms of its fourth-order tenser of moduli satisfies the localization condition, and ... -
Observations of solitary wave dynamics of film flows
(2001)Experimental results are reported on non-stationary evolution and interactions of waves forming on water and water-glycerol solution flowing along an inclined plane. A nonlinear wave generation process leads to a large ... -
On phase change in Marangoni-driven flows and its effects on the hydrothermal-wave instabilities
(2014)This paper investigates the effects of phase change on the stability of a laterally heated liquid layer for the first time. The interface is open to the atmosphere and vapor diffusion is the rate-limiting mechanism for ... -
On the stick-slip flow from slit and cylindrical dies of a Phan-Thien and Tanner fluid model. II. Linear stability analysis
(2013)During extrusion of viscoelastic fluids various flow instabilities may arise resulting in a distorted free surface. In order to investigate the factors generating these instabilities we performed a linear stability analysis ... -
Short- to long-wave resonance and soliton formation in boundary-layer interaction with a liquid film
(2010)Dynamic interaction between a boundary layer of air and a liquid film is investigated in this paper. The low air-to-film-viscosity ratio is considered in which case the boundary layer is quasi-steady on the time scale ... -
Solitary waves on inclined films: Flow structure and binary interactions
(2002)The downstream evolution of disturbances, introduced at the inlet of a liquid film flowing along an inclined plane wall, is studied numerically by solving the full, time-dependent Navier-Stokes equation. Computational ... -
Solitary waves on inclined films: their characteristics and the effects on wall shear stress
(2006)The properties of solitary waves, developing from inlet disturbances of controlled frequency along an inclined film flow, are systematically studied experimentally and computationally. Time-variations of film height and ... -
Stability of long transversely-isotropic elastic cylindrical shells under bending
(2010)The present paper investigates buckling of cylindrical shells of transversely-isotropic elastic material subjected to bending, considering the nonlinear prebuckling ovalized configuration. A large-strain hypoelastic model ...