SPACE

Author: ACERO DÍAZ FRANCISCO JAVIER.
Year: 2004.
University: EXTREMADURA.
Place of defense: ESCUELA DE INGENIERÍAS INDUSTRIALES DE BADAJOZ.
Place of preparation: ESCUELA DE INGENIERÍAS INDUSTRIALES.

Summary: The presence of rotation in artificial satellites and space stations is a motivation to study its influence on fluid dynamics in microgravity conditions, especially liquid bridges. In general, forms of balance and limits of stability of bridges liquid quantitatively affected by the presence of rotation. In the dynamic linear rotation can cause even qualitative changes. The essential aim of this thesis is to figure out ways to balance liquid bridges under various conditions, and analyzing the dynamic linear isotherm. The effect caused by the rotation receives special attention, but other factors such as the action of axial and lateral forces, or the shape of solid supports are also considered. The results are obtained, mostly through analytical procedures, but in some cases resorting to digital. More specifically, ways to balance is calculated using a method perturbativo for close to the cylindrical configurations. The validity of this procedure is established by comparison with the results obtained from a finite difference scheme developed by other authors. The main contribution of this work is the calculation of the modes of oscillation while axisimétricos as not axisimétricos for bridges not viscous liquid cylindrical rotating, which is the natural extension of an earlier analysis conducted for zero angular velocity. The equations are obtained characteristics that determine the natural frequency spectra as a function of angular velocity in the elliptic regime. The extension of the analysis to bridges liquid axisimétricos is carried out using two procedures numerical proposed earlier. Finally, it shows the influence of viscosity in the dynamics of a linear liquid bridge using the one-dimensional model of Cosserat. To that end, we choose as an example the small amplitude harmonic vibration of a bridge liquid axisimétrico. Previously, establishing the validity of the approximation dimensional contrasting predictions obtained for the first mode oscillation with those calculated from equations Navier-stokes.