ENERGIES 2024, 17(6), 1328 P. Oliveira, F. Brójo (https://doi.org/10.3390/en17061328) Diesel engines are known for their excellent efficiency and are therefore used in a variety of applications. However, they are also one of the main sources of hazardous emissions such as nitrogen oxides (NOx) and smoke. Water-in-Diesel Emulsion (WiDE) is an alternative fuel that can possibly reduce […]

JOURNAL OF CLEANER PRODUCTION Vol. 275, 2020, 124167 R. Silva, A. Silva, T. Lima b, F. Charrua-Santos, G. Osório (https://doi.org/10.1016/j.jclepro.2020.124167) There are numerous methodologies to measure sustainability, but there are few models on Energy Sustainability (ES) that focus on the proper use of energy sources. This manuscript aims to present the ESUI (Energy Sustainability Universal […]

PROCESSES 2022, 10(7), 1384 Ana Proença, Pedro Gaspar, Tânia Lima (https://doi.org/10.3390/pr10071384) The organizations of horticultural producers and, particularly, those that deal with extremely perishable endogenous fruits, such as peaches and cherries, have a greater need to optimize production flows and processes. A particularity of the horticultural industry is the short shelf life of raw materials […]

ACTA ASTRONAUTICA Volume 203, February 2023, Pages 48-59 Odelma Teixeira, José Páscoa (doi.org/10.1016/j.actaastro.2022.11.031) This paper investigates the effects of wall catalytic activity in hypersonic nozzle flows. Non-equilibrium Navier–Stokes–Fourier equations were here applied within a density-based algorithm in the OpenFOAM framework. The numerical model was validated using different test conditions conducted at NASA EAST facility and […]

PHYSICS OF FLUIDS  Vol. 35, 075119 (2023) Mohammad-Reza Pendar, Sílvio Cândido, José Páscoa (doi.org/10.1063/5.0156571) The impetus of the current three-dimensional Eulerian–Lagrangian work is to analyze the impact of simultaneously using the inventive high-voltage conductors and Nitrotherm spraying technique for maximizing the industrial painting process efficiency. This investigation employs high-fidelity computational fluid dynamics (CFD) results in […]

INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE Volume 193, 2023, 103947 Sílvio Cândido, José C. Páscoa (doi.org/10.1016/j.ijengsci.2023.103947) The dynamics of the interface of a fluid jet subjected to an external electrostatic field forming a Taylor cone jet is investigated using a numerical approach. A charge-conservative electrohydrodynamic model is used. In this model, the reduced form of Maxwell’s […]

PHYSICS OF FLUIDS Vol. 34, 033110 (2022) M. Davoodi, K. Zografos,P. J. Oliveira, R. J. Poole (doi.org/10.1063/5.0083717) For many commonly used viscoelastic constitutive equations, it is well known that the limiting behavior is that of the Oldroyd-B model. Here, we compare the response of the simplified linear form of the Phan-Thien–Tanner model (“sPTT”) [Phan-Thien and […]

COMPOSITE STRUCTURES Volume 245, 1 August 2020, 112305 Thiago Dutra, Rafael Ferreira, Hugo Resende, Alessandro Guimarães, José Guedes (doi.org/10.1016/j.compstruct.2020.112305) Homogenization techniques are very important in describing the mechanical behavior of high performance composite materials. Among the different techniques applied to this modeling, the RVE (Representative Volume Element) and AH (Asymptotic Homogenization) play an important role. […]

TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE Volume 175, February 2022, 121387 L.C.M. Miranda, Tessaleno Devezas (doi.org/10.1016/j.techfore.2021.121387) In this article it is presented a multi-logistic model to describe the time evolution of the Covid-19 pandemics. The model is not intended as paragon for the accurate prediction of the future number of people infected, but instead as a […]

POLYMERS 2023, 15(9), 1979 André Vieira, Enio Da Silva, Marcelo Ribeiro (doi.org/10.3390/polym15091979) Biodegradable polymers find applications in many market segments. The ability to meet mechanical requirements within a certain time range, after which it degrades and is naturally absorbed, can be used to produce short-term use products that can be easily disposable with less environmental […]

ACTA ASTRONAUTICA Volume 192, March 2022, Pages 15-29 Danil Ivanov, Rui Gondar, Uliana Monakhova, Anna Guerman, Mikhail Ovchinnikov (doi.org/10.1016/j.actaastro.2021.12.014) A swarm of ChipSats equipped with miniature magnetorquers is considered, the electromagnetic interaction force is used for relative motion control at extremely short relative distances up to several centimetres. A ChipSat is a satellite printed on […]

ENERGIES 2024, 17(6), 1328 Pedro Oliveira, Francisco Brójo (doi.org/10.3390/en17061328) Diesel engines are known for their excellent efficiency and are therefore used in a variety of applications. However, they are also one of the main sources of hazardous emissions such as nitrogen oxides (NOx) and smoke. Water-in-Diesel Emulsion (WiDE) is an alternative fuel that can possibly […]

ENERGIES 2020, 13(16), 4157 Pedro Alves, Miguel Silvestre, Pedro Gamboa (doi;10.1615/InterJEnerCleanEnv.2022044414) The race for speed ruled the early Jet Age on aviation. Aircraft manufacturers chased faster and faster planes in a fight for pride and capability. In the early 1970s, dreams were that the future would be supersonic, but fuel economy and unacceptable noise levels […]

INTERNATIONAL JOURNAL OF FATIGUE Volume 142, December 2022, 106785 Luís Reis, Pedro R. Da Costa, Ricardo Pereira, Diogo Montalvão, Manuel Freitas (doi.org/10.1016/j.engfailanal.2022.106785) Ultrasonic fatigue specimens require rigorous design. The entire machine and specimen setup must vibrate in resonance at high frequencies, with the desired mode shapes that produce the intended stresses. The connection between parts […]

INTERNATIONAL JOURNAL OF FATIGUE Volume 136, July 2020, 105581 Pedro R. da Costa, Henrique Soares, Luís Reis, Manuel Freitas(doi;10.1016/j.ijfatigue.2020.105581) Ultrasonic fatigue testing is a relative recent fatigue study methodology that applies resonant principles for the induction of stress cycles in a specific designed material specimen. Such experimental method can apply fatigue damage at high frequencies, […]

INTERNATIONAL JOURNAL OF ENERGY FOR A CLEAN ENVIRONMENT Volume 24, 2023, pp. 45-59 R. Nanga, J. Curto, P.D. Gaspar, P.D. Silva, J. Cruz (doi;10.1615/InterJEnerCleanEnv.2022044414) Temperature is the parameter that most affects the rate of deterioration of horticultural products and their postharvest life. Therefore, fast removal of heat from the field after harvesting by cooling and […]

AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY Vol. 94 No. 2, pp. 255-267 J. de Sousa, P. Gamboa (doi:10.1108/AEAT-01-2021-0015) The purpose of this paper is to generate optimised trajectories for an unmanned aerial vehicle (UAV) during a forest fire detection mission. It is assumed that the UAV flies 3D curvature-constrained Dubins manoeuvres and has a limited amount […]

ENGINEERING FAILURE ANALYSIS Volume 151, September 2023, 107404. T. Barros, B. Santos, V. Infante, M. Freitas, B. Fernandes, P. Gamboa, A. Moura (doi:10.1016/j.engfailanal.2023.107404) Military aircraft perform demanding maneuvers with a wide range of load factor levels, allowing the growth of fatigue cracks that shall be duly monitored to prevent unexpected failures. In order to monitor […]

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY Volume 43, Issue 14, November 2023, Pages 6112-6121. K.O. Shvydyuk, F.F. Rodrigues, J. Nunes-Pereira, J.C. Páscoa, S. Lanceros-Mendez, A.P. Silva (doi:10.1016/j.jeurceramsoc.2023.05.040) The developed research presents a novel experimental study of the cost-effective MgO-Al2O3, MgO-CaZrO3 perovskite, and thermally stable YSZ ceramic composites for DBD plasma actuators in aerospace applications. This study focuses on the implementation […]

ANNUAL REVIEW OF FLUID MECHANICS Volume 53, 2021   M.A. Alves, P.J. Oliveira, and F.T. Pinho (doi:10.1146/annurev-fluid-010719-060107) Complex fluids exist in nature and are continually engineered for specific applications involving the addition of macromolecules to a solvent, among other means. This imparts viscoelasticity to the fluid, a property responsible for various flow instabilities and major modifications […]