Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Parametric modelling of a biomimetic propulsion system using additive manufacturing for autonomous underwater vehicles(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-12-01) Lima Rodríguez, Biali Fernando; Martínez López, José Israel; puemcuervo; Vázquez Lepe, Elisa Virginia; Chuck Hernandez, Cristina Elizabeth; School of Engineering and Sciences; Campus MonterreyThis work presents a novel pseudorandom algorithm for generating in-silico biomimetic models of caudal fins for additive manufacturing for flexible materials. The methodology provides a tool to develop caudal fin models for different morphologies (within rounded, truncated, forked, and lunate), geometrical features and, considering randomness to improve the lifelikeness of the model. The capability of the algorithm to generate designs with customized hydrodynamic features was evaluated in-silico using computational fluid dynamics comparing the maximum velocity and the angle of attack. Numerical data shows that customization of key dimensional can be integrated into a flexible and dynamic design process. This work is a step towards reproducing more robust and lifelike engineering systems.
- Numerical investigation on the heat transfer enhancement by the combination of wavy tape, dimples and nanofluids in a PTC receiver.(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-09-10) Cuevas Iturbe, Luis Donaldo; RIVERA SOLORIO, CARLOS IVAN; 121148; Rivera Solorio, Carlos Iván; tolmquevedo; Bretado de los Ríos, Mariana Soledad; Morales Menéndez, Rubén; School of Engineering and Sciences; Campus Monterrey; Gijón Rivera, Miguel ÁngelParabolic trough collector (PTC) is the most developed concentrating solar technology. It represents a viable way to substitute fossil fuels in the production of heat process, however higher thermo-hydraulic performance is needed to be more competitive. This study presents a numerical investigation of dimples, wavy tape and nanofluids (Al2O3, TiO2 and Al2O3-TiO2 dispersed in water at 4% concentration) in combination, in a PTC receiver. Fluent was used to solve the fluid dynamics and heat transfer characteristics inside the PTC receiver with the different heat transfer enhancement techniques for Reynolds numbers ranging from 1.48x104 to 1.77x105. The study showed that dimples with Al2O3/water nanofluid lead to a higher thermo-hydraulic performance evaluated with the Thermal Performance Index with values as high as 1.78. It was also proven that the highest thermal enhancement is obtained when the three heat transfer augmentation techniques are used in combination (wavy tape, dimples, and Al2O3/water nanofluid) with a heat transfer coefficient enhancement of 3.12 times that of a plain PTC receiver with no thermal enhancement. Nonetheless, the combination of techniques also come with a high cost of pressure drop increase from 8.52 to 12.59 compared to the plain PTC receiver. The combination of all the techniques proved more useful at low Reynolds numbers because the flow is not as turbulent. As Reynolds number increases, the thermal increase is not proportional to the mean pressure drop increase, then leading poor performances at high Reynolds numbers. On the other hand, wavy tape with nanofluids proved to have better thermal performances at high Reynolds numbers. The use of nanofluids always leads to the higher thermal performance values. Regarding the different nanofluids, the difference among them is non-significant compared to each other in terms of mean pressure drop, however in terms of heat transfer coefficient improvement, there is about 1.34% difference between the highest thermal performance nanofluids (Al2O3, and Al2O3-TiO2) and TiO2/water nanofluid.
- Design of road-side barriers to mitigate air pollution near roads(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-03) Aguirre Gutiérrez, Javier Eduardo; Huertas Cardozo, José Ignacio; tolmquevedo; López Mejia, Omar Darío; Huertas Bolaños, María Elena; Escuela de Ingeniería y Ciencias; Campus MonterreyWe quantified the effects of the use of solid barriers on the dispersion of air pollutants emitted from the traffic of vehicles on roads located over flat areas, aiming to identify the geometry that maximizes the mitigation effect of air pollution near the road at the lowest barrier cost. Toward that end, we systematically used the near road CFD (NR-CFD) model that simulates the physics occurring in the atmosphere in a small computational domain (<1 km long) by numerically solving, via computational fluid dynamics (CFD), the equations that describe the dynamics of the atmosphere in the near surface layer (ASL) (<250 m high). Results from the NR-CFD model were highly correlated (R2>0.96) with the SF6 concentrations measured by the US-NOAA in 2008 downwind a line source emission, for the case of a 6m near road solid straight barrier and for the case of without any barrier. We considered the effects of different geometries, sizes, and locations. We observed that, under all barrier configurations, the normalized pollutant concentrations downwind the barrier are highly correlated (R2>0.86) to the concentrations observed without barrier. Best cost-effective configuration was observed with a quarter-ellipse barrier geometry with a height equivalent to 15% the road width and located at the road edge, where the pollutant concentrations were 76% lower than the ones observed without any barrier.
- Characterization of arc extinction in direct current residential circuit breakers(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2018-05-15) Bautista Cruz, Julio César; Viramontes Brown, Federico Ángel; Rivera Solorio, Carlos Iván; Gutiérrez Villanueva, Efrain; Suarez Guevara, José CarlosBreak the current in a direct current (DC) network is a challenging theme since the current does not exhibit a zero crossing point, making it difficult to interrupt. Regardless of the method, the physical effect of switching is the formation of an electric arc, causing high levels of temperature, strong magnetic fields, current of several tens of KA, added to mechanical stress and overpressure on the walls. Due to this reason, physical phenomena should be studied to determine a suitable design. This thesis starts by understanding the arc in alternating current (AC), then proceeds to DC. A theoretical description of the electric arc is outlined, based on plasma physics. The Magneto-Hydrodynamic (MHD) model is proposed, which allows modeling a plasma as an electric fluid, allowing coupling the equations of fluid mechanics and magnetic fields.
- Estudio del proceso de atemperación mediante CFD(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2018-05-11) López Pulido, Amayraní; Huertas Cardozo, José Ignacio; Xicale de Aquino, Alfredo; Hernández Ramírez, Isaías; Huertas Cardozo, José Ignacio; Montesinos Castellanos, Alejandro; Xicale de Aquino, Alfredo; Hernández Hernández, IsaíasActualmente, la búsqueda de una mayor generación eléctrica a partir de energías renovables ha posicionado al ciclo combinado como la tecnología capaza de realizar esta transición. Estos ciclos consisten en la integración de un ciclo Brayton por medio de una caldera de recuperación de vapor a un ciclo Rankine. Un componente fundamental para el correcto funcionamiento de las calderas de recuperación de vapor es el atemperador de vapor. Este sirve como sistema de control de la temperatura del vapor, por medio de la inyección de agua subenfriada. Se contruyeron simulaciones mediante CFD con la finalidad de observar a detalle lo que ocurre cuando el agua es inyectada a un flujo de vapor sobrecalentado, entender los fenómenos de transferencia de masa, energía y momentum es fundamental para el proceso de diseño de estos sistemas de atemperación. En base a los resultados se definieron zonas termodinámicas para asegurar una evapoación completa en base a la relación de flujos másicos. Se observó también, el comportamiento de ambas fases en el proceso de evaporación que se dividió en dos regiones, ahondando en el estudio de la segunda. Se obtuvo una ecuación que permite describir la evolución de la temperatura promedio de la mezcla y con la que se puede tener una estimación de la longitud mínima de evaporación. A su vez se estudió el efecto que tiene el tamaño de gota en el proceso y se concluyó que gotas más pequeñas permiten aumentar la transferencia de masa y calor entre las fases, lo que propicia una mejor evaporación en una distancia menor.
- Simulation and modeling of three mechanisms of flow through porous media.(2017-12-05) Romero Flores, Michel; López Salinas, José Luis; García Cuéllar, Alejandro Javier; Rivera Solorio, Carlos IvánThe mathematical modeling of two-phase flow in saturated porous media, as well as the modeling of adsorption/retention behavior of surface active materials in a porous medium composed of a complex network of macro, meso, and micropores in 1-D, 2-D and axisymmetric cases and the displacement of two phases in capillary conducts, were studied. Also, a Comparison of two CFD tools is made (COMSOL and ANSYS Fluent). The results were compared with experimental data from the literature. For the saturated porous media study and mathematical modeling of adsorption/retention behavior, COMSOL software was used, while for the capillary conducts displacement, ANSYS Fluent was chosen. In the saturated porous media analysis, different ways to obtain permeabilities and their effects on the flow in saturated porous media were compared. For the mathematical modeling of adsorption/retention behavior of surface active materials in a porous medium different effects were analyzed: the selection of boundary conditions, the size of the tracer and surfactant signals, effects of reversible and irreversible adsorption, the difference between local equilibrium and the rate-limited process. Also, for 2-D and axisymmetric simulations, heterogeneities, blends of surfactant and dispersion/diffusion effects were studied. The proposed mathematical model compares favorably with experimental data from literature when taking macro and mesoporosity into account. This model should be helpful in guiding the design of dynamic adsorption experiments, and to understand how heterogeneities in the rock may influence the interpretation of experimental results. Finally, capillary displacement was analyzed in an axisymmetric system, and the results were compared against a onedimensional model and experimental results obtained through experimentation. This was done to identify the benefits of simulating this type of phenomena, because, sometimes a simplified model can hide vital information for the experiments. The axisymmetric simulations were superior when showing the complete information of the phenomena but at a much higher computational cost than the one-dimensional model