A5075995285- Spacecraft and Cryogenic Technologies
- Nonlinear Dynamics and Pattern Formation
- Phase Change Materials Research
- Planetary Science and Exploration
- Solidification and crystal growth phenomena
- Micro and Nano Robotics
- Ocean Waves and Remote Sensing
- Fluid Dynamics and Thin Films
- Fluid Dynamics and Heat Transfer
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic and Electromagnetic Effects
- Spacecraft Design and Technology
- Tribology and Lubrication Engineering
- Ionosphere and magnetosphere dynamics
- Space Satellite Systems and Control
- Structural Health Monitoring Techniques
- Quantum chaos and dynamical systems
- Force Microscopy Techniques and Applications
- Engineering Education and Pedagogy
- Solar Thermal and Photovoltaic Systems
- Spaceflight effects on biology
- Coastal and Marine Dynamics
- Problem and Project Based Learning
- Advanced Thermodynamics and Statistical Mechanics
- Adhesion, Friction, and Surface Interactions
Universidad Politécnica de Madrid
2006-2023
Consejo Superior de Investigaciones Científicas
2009
Present as well future challenges of space exploration point to the need for improved thermal control systems. The "Effect Marangoni Convection on Heat Transfer in Phase Change Materials" experiment, which is approved by ESA execution board International Space Station, aims contribute directly current knowledge and basic understanding heat mass transport phase change materials (PCMs) that incorporate a free surface reduced gravity. experiment will apply fixed temperatures opposite ends PCM...
A numerical analysis of the thermocapillary-driven dynamics a free surface in microgravity is presented for an open container liquid subjected to steady or oscillatory thermal excitation. The response this forcing analyzed parameters representative common silicone oils. In contrast previous investigations, we permit large-scale unconstrained motion contact points and deformation surface, which allows us study interaction between thermocapillary flow. First, excitation considered...
The performance of Phase Change Material (PCM) devices in microgravity can be significantly improved by thermocapillary convection. However, the melting process this case is affected a series instabilities and mode transitions due to evolving size shape liquid domain. We perform numerical investigation pattern selection for flow ideal rectangular containers n-octadecane show how applied explain more complex dynamics PCMs. In particular, locations travelling standing wave predicted way very...
Experiments on vibrated fluids confined in cylindrical and cuboidal containers were performed under the reduced gravity conditions of a parabolic flight. The results constitute systematic quantitative investigation vibroequilibria effect, which refers to reorientation response inhomogeneous oscillatory velocity field accompanying dynamic pressure. This effect is amplified microgravity where restoring force small or absent. Here vibrations are transmitted via pair piezoelectric ceramics...
Use of a conductive bare tape electrically floating in low Earth orbit as an effective electron beam source to produce artificial auroral effects, free problems that mar standard beams, is considered. Ambient ions impacting the with keV energies over most its length liberate secondary electrons race down magnetic field, excite neutrals E layer, and result emissions. The tether would operate both power supply plasma contactor off at nighttime; be on daytime for reboost. Tomographic analysis...
We present results of an experimental and numerical investigation the patterns realized by surface waves within open rectangular container subjected to horizontal vibrations at frequencies 40–100 Hz. The first instability exhibited primary harmonic wave field is subharmonic, may be identified with cross-wave often seen in tank experiments. show that, contrary common theoretical assumptions, despite their name, these subharmonic are not oriented crosswise, but intermediate angle respect axis...
Vibroequilibria theory, based on minimizing an averaged energy functional, predicts the quasi-equilibrium shape that a fluid volume will take when subjected to high-frequency vibrations. Here we present detailed comparison of predictions vibroequilibria theory with results direct numerical simulations in horizontally vibrated rectangular containers, finding very good agreement over range parameters. The calculations also reveal important difference behavior between small and large volumes....
The dynamics of two weakly coupled parametric oscillators are studied in the neighborhood primary subharmonic instability. nature both and secondary instabilities depends a critical way on permutation symmetries, if any, that remain after coupling is considered, this relative phases forcing terms. Detailed bifurcation sets, revealing complex series transitions organized part by Bogdanov-Takens points, calculated for representative sets parameters. In particular case out-of-phase predictions...
Cross-wave descriptions based on a boundary forced nonlinear Schrodinger equation, which have been widely used since Jones [J. Fluid Mech. 138, 53–74 (1984)], rely the assumption that modulations occur slow lengthscale compared with extent of forcing. This does not hold for recent higher frequency (large aspect ratio) experiments. We extend established theory modulated cross-waves in horizontally vibrated containers by including surface tension and, most importantly, spatially extended...
This manuscript summarizes the educational and scientific outcome of Research-based learning activities performed in bachelor’s, master’s, doctorate programmes aerospace engineering at Technical University Madrid. The are related to line research Phase Change Materials microgravity developed Spanish User Support Operations Centre. principal results obtained during these years outlined, drawing particular attention those “Thermocapillary Effects Microgravity” experiment “Effect Marangoni...
We investigate pattern selection at onset in a parametrically and inhomogeneously forced partial differential equation obtained by generalizing Mathieu's to include spatial interactions. No separation of scales is assumed. The proposed model directly relevant the case surface waves, such as cross-waves, excited horizontal vibration fluid, where forcing localized finite region near endwall or wavemaker. availability analytical solutions limit piecewise constant allows us detail dependence...
Motivated by the increasing interest on nonlinear nondestructive damage detection, a comparison of elastic behavior damaged samples and their intact state is presented. Flexural vibration induced in thin glass plates with laser thermal shock micro-cracks means two piezo-ceramic patches glued bimorph configuration. The cases direct excitation resonance an internal are considered. resulting vibrations exhibit main features quadratic hysteresis: linear variation frequency production third...
Use of a (bare) conductive tape electrically floating in LEO as an effective e-beam source that produces artificial auroras, and is free problems have marred standard beams, considered. Ambient ions impacting the with KeV energies over most its length liberate secondary electrons, which race down magnetic field excite neutrals E-layer, resulting auroral emissions. The tether would operate at night-time both power supply plasma contactor off; be on daytime for reboost. optimal thickness...
P. Salgado Sánchez , I. Tinao, J. M. Ezquerro, J.J. Fernández, Rodríguez, A. Bello, K. OlfeUniversidad Politécnica de Madrid (SPAIN)