https://ria.asturias.es/RIA/handle/123456789/2221 2025-12-23T10:32:50Z https://ria.asturias.es/RIA/handle/123456789/13448 Title: Web of Things reference-implementatio for a microservices-based servient Authors: CENTRO TECNOLOGICO, CTIC 2020-12-01T00:00:00Z https://ria.asturias.es/RIA/handle/123456789/14487 Title: Vidrios metálicos de base Zr-Cu sinterizados por Spark Plasma Sintering Authors: Suárez, Marta; Fenández-González, Daniel; Piñuela-Noval, Juan; Díaz, Luis Antonio; Diologent, Frederic; Verdeja, Luis Felipe; Fernández, Adolfo 2022-06-29T00:00:00Z https://ria.asturias.es/RIA/handle/123456789/7925 Title: Turbulence structure around an asymmetric high-lift airfoil for different incidence angles Authors: Solis Gallego, Irene; Meana Fernández, Andrés; Fernández Oro, Jesus Manuel; Argüelles Díaz, Katia María; Velarde Suárez, Sandra Abstract: An exhaustive investigation of the structure of the turbulence around an asymmetric FX 63-137 wind turbine airfoil is carried out in this paper. Reliable hot-wire velocity measurements, made at the Xixon Aeroacoustic Wind Tunnel, are presented with the aim of analyzing the turbulent flow features. The probe was placed at two different positions along the streamwise direction, one over the airfoil and the other at the wake, both on the suction and pressure side. These measurements were performed in order to capture the evolution of the flow and its behavior at the wake. The experimental data were collected at a Reynolds number of 350000 for several incidence angles to explore their influence in the turbulence characteristics. The data processing from the dual hot-wire, capable of measuring two velocity components, allowed to achieve half set of the Reynolds stresses, the turbulence intensity and the degree of anisotropy. The boundary layer and wake size were estimated from the Reynolds stress components. In addition, the production term of the turbulence kinetic energy budget is calculated to visualize the unsteadiness energy inside the boundary layer. As a result of these analyses, it was observed that the transversal fluctuations were higher than the longitudinal ones. Besides, an alternative description of the turbulence structure is obtained when a frequency analysis of the motion is provided, disclosing a clear change in the spectra tendencies in the wake and boundary layer regions. This analysis, combined with the degree of anisotropy analysis, was helpful to define a transition zone between the clearly distinguishable instability zone and the free-stream zone. Finally, the integral length scale of turbulence was estimated from the area under the autocorrelation function of the velocity fluctuations. The combination of the results of this work have provided a wide description of the turbulent behavior of the flow around the airfoil and present a clearer physical picture of the phenomena. 2017-07-01T00:00:00Z https://ria.asturias.es/RIA/handle/123456789/14630 Title: Tortuosity of the porous structure of carbon gels Authors: Flores-López, Samantha L.; Ramírez-Montoya, Luis A.; Casal, M. Dolores; Montes-Morán, Miguel A.; Menéndez, J. Ángel; Arenillas, Ana Abstract: Extensive studies on the correlation between synthesis variables and the final properties of resorcinol-formaldehyde carbon gels have been performed. This knowledge allows us to obtain carbon gels with analogous mean pore sizes and porosity from different combinations of synthesis variables. However, although the materials exhibit these similar characteristics, their behaviors may be very different in certain applications. Since the distribution and connectivity of the polymeric clusters are strongly affected by variables such as the amount of water and methanol in the precursor solution, it seems that the pore tortuosity and thus the permeability of the materials are also dependent on these factors. Further analysis of a series of carbon gels with the apparent same porosity shows how an increase in the amount of water or a suitable combination of methanol content and the pH of the precursor solution used for the polymerization process generate less tortuous pore structures. This allows us to attain even finer tuning of the porous structure of RF carbon gels either to reduce pressure drop or to increase the residence time of solutes in separation processes. 2020-09-29T00:00:00Z