Ciencias Exactas 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 Monterrey
This 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 Ángel
Parabolic 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 Monterrey
We 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.

Ciencias Exactas y Ciencias de la Salud

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