Jorge Barata

Universidade da Beira Interior, Department of Aerospace Sciences, Faculty Member

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Habilitation on Aerospace Sciences, University of Beira Interior, Covilhã, 1999. PhD in Mechanical Engineering, Instituto Superior Técnico, Technical University of Lisbon, Portugal, 1989. Master on Energy Transfer and Conversion, Instituto Superior Técnico, Technical University of Lisbon, Portugal, 1985. BEng on Mechanical Engineering, University of Coimbra, Portugal, 1982.Authored more than 250 publications including books, chapter of books, papers on journals and scientific meetings in the areas of V/STOL aerodynamics and propulsion. Member of the editorial board and reviewer of scientific journals (AIAA Journal, Journal of Aircraft, IMechE Journal of Aerospace Engineering, Atomization and Sprays, among others) and scientific congresses.Presently full professor of the Aerospace Sciences Department of the University of Beira Interior, Covilhã, Portugal, scientific coordinator of the AeroG-Aeronautics and Astronautics Research Group of the Associated Laboratory on Energy, Transports and Aerospace, and an Associate Fellow of the American Institute of Aeronautics and Astronautics.

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Papers by Jorge Barata

Heat transfer effect on the modeling of jets under supercritical and transcritical conditions

CEAS space journal, Feb 3, 2024

The injection of nitrogen under supercritical and transcritical conditions, where the injection t... more The injection of nitrogen under supercritical and transcritical conditions, where the injection temperature is below nitrogen's critical point, but the pressure is above it, is considered in this paper. While the scientific community recognizes that the sharp gradients of the different thermophysical parameters make it inappropriate to employ a two-phase flow modeling at conditions above the critical point, the issue is not restrained to the mere representation of turbulence for a mono-phase flow. Instead, a quantitative similarity with gas-jet-like behavior led to proposing an incompressible but variable density hypothesis suitable for describing supercritical and sub/near-critical conditions. Presently, such an approach is extended and assessed for a configuration including injector heat transfer. As such, axial density and temperature decay rates and jet spreading rates of density and temperature are evaluated, indicating a higher mixing efficiency in the supercritical regime and an overall dominance of heat propagation over momentum transport, with a greater preponderance in the supercritical regime.

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Twenty-Five Years of Portuguese Aviation Events at Amadora

Leading-Edge Parametric Study of the NACA0012-IK30 Airfoil

Computational study on coaxial nitrogen-hydrogen injection at supercritical conditions

Experimental and Numerical Study of Single Droplets Impinging Upon Liquid Films

Proceeding of 4th Thermal and Fluids Engineering Conference, 2019

Visualization of a Ground Vortex Flow

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010

Flow visualization results are presented for a highly curved flow resulting from the collision of... more Flow visualization results are presented for a highly curved flow resulting from the collision of plane turbulent wall jet with a boundary layer. This configuration can be found in the case of impinging jets of a V/STOL aircraft operating in ground vicinity. The experiments were carried out for wall jet to boundary layer velocity ratio of 1.57. The present results revealed the existence of two small vortexes located in the collision zone, that exhibit an unsteady behaviour.

Computational Analysis of High-Pressure Nitrogen Jets from Transcritical to Supercritical Gas-Lik

Comparative Study of Droplet Impact onto Sloped Surface versus a Droplet Impact onto a Surface with a Crossflow

AIAA Scitech 2019 Forum

Copyright © 2019 by Inês A. S. Ferrão; Daniela F. S. Ribeiro; Jorge M. M. Barata; André R. R. Sil... more Copyright © 2019 by Inês A. S. Ferrão; Daniela F. S. Ribeiro; Jorge M. M. Barata; André R. R. Silva. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.Droplet impact is a common phenomenon that occurs frequently in several applications such as fuel injection in internal combustion engines, processes involving spray paints and cooling of electronic equipment. In the study of droplet impingement, the influencing parameters are the liquid, along with its physical properties, the impact surface, the surrounding environment and others conditions. The major goal of the present work is a comparison that involves an experimental study of the phenomena occurring during the impact of liquid droplets onto a dry surface with a cross flowing air and droplets impacting onto a sloped surface. Due to the crossflow, the droplet does not have the same direction as the gravitational acceleration and suffers a certain deformation that seems to vary the impact condition. For the sloped surface, the droplet is spherical throughout the trajectory and both the gravitational acceleration and movement of the droplet have the same direction. Four fluids were used: 100% Jet-Fuel, 75% Jet-Fuel-25% HVO, 50% Jet-Fuel-50%. HVO and H2O (pure water) as a reference. In order to maintain the coherence of the results between the two experimental works, the impact velocity and incident angle were kept approximately the same.The present work was performed for the interinstitutional project “BISI – Biofuel Spray Impact in Aero-Engines” under the scope of Laboratório Associado em Energia, Transportes e Aeronáutica (LAETA) – activities and it was supported by Fundação para a Ciência e Tecnologia (FCT) through the project UID/EMS/50022/2013, and by Fundação Luso-Americana para o Desenvolvimento (FLAD) through the project 07/2019. Fundação Luso-Americana para o Desenvolvimento (FLAD) Project 07/2019.info:eu-repo/semantics/publishedVersio

Numerical Modeling of a Cooling Water Droplet Using a Two-Phase Flow Approach

AIAA Scitech 2019 Forum, 2019

The study and understanding of cooling and freezing water droplets is of paramount importance due... more The study and understanding of cooling and freezing water droplets is of paramount importance due to their influence in the decrease of aerodynamic performance on lifting surfaces. It is imperative to develop models capable of simulating the freezing processes and ice accretion effects, in order to predict with maximum efficiency freezing and avoid this phenomenon or even taking advantage of it and develop new technologies that ultimately will improve air travel. As such, this paper aims to study the cooling of a water droplet in free fall. A two-way coupling model is implemented to evaluate the influence of gas-drop and drop-gas interactions, numerically investigating the cooling of free falling droplets for different diameters and air humidity ratios. The predictions are compared with experimental and numerical data with the objective of providing insight into the degree of heat and mass transfer involved. Some correlations to account for the convection effects are introduced and are found to be in close agreement with the experimental data.info:eu-repo/semantics/publishedVersio

Precision Sextant: An Early Portuguese Landmark on Aeronautical History

AIAA Scitech 2019 Forum, 2019

The Transatlantic Flights performed at 1919 proved to be a tremendous success; however, aerial na... more The Transatlantic Flights performed at 1919 proved to be a tremendous success; however, aerial navigation over ocean was based on radio equipment. Sextants were very difficult to use, and methods of calculations were quite time-consuming to provide positioning results of an aircraft at great speeds. For these reasons, the Aerial Astronavigation was considered unsuitable. 3 years later, two Portuguese airmen managed to perform the First Aerial Crossing of the South Atlantic exclusively achieved by Aerial Astronavigation in an unprecedent route precision achievement; such feat was a milestone in Aviation History, marking the debut of the sextant as a key mean for air navigation: for the first time, sextant, course corrector and methods of calculations proved their effectiveness and value for aerial navigation. Reports of the 1st South Atlantic Air Crossing [Relatórios da 1ª Travessia Aérea do Atlântico Sul] written by Coutinho and Cabral, published in 1922, were included in the International Register of the “Memory of the World” of UNESCO. After July 27, 2011, the reports were considered World Heritage [Património da Humanidade].info:eu-repo/semantics/publishedVersio

History of Aeronautics Engineering Course at UBI

AIAA SCITECH 2023 Forum

The outset of the Portuguese Military Aeronautics (1912-1917)

AIAA SCITECH 2023 Forum

A Trailblazing Flight for Portuguese Overseas Commercial Air Routes

AIAA SCITECH 2023 Forum

Correction: Morphology of Bubble Formation on Droplet Impact upon Thin Liquid Layers

AIAA Scitech 2020 Forum, 2020

Centennial 1922–2022: First Transoceanic Flight with Autonomous Aerial Navigation

AIAA SCITECH 2022 Forum, 2022

Wing Design and Analysis for Micro Air Vehicle Development

AIAA SCITECH 2022 Forum, 2022

Natural flight was always a source of inspiration to the human being, and with this, humans learn... more Natural flight was always a source of inspiration to the human being, and with this, humans learned from observing it, even trying to reproduce multiple times what they saw. So new challenges emerged, and as new improvements with the evolution of technology, biomimetic gained new applicability, and great interest among the aeronautical scientific research community. The main objective of the present dissertation is to evaluate experimentally the influence of the shape, and structure in the wing, on their behavior and performance. To accomplish that goal, eight wings were designed (with two different methods), and afterward built, and tested at different airflow speeds (from 0 m/s up to 4 m/s) to compare their results as a function of their frequency, amplitude, average power, and their associated dimensionless parameters. After analyzing the results, it was seen that the amplitude ranges were between 0,12 m and 0,27 m, frequency between 4 Hz and 15 Hz, average power between 0,7 W and 1,8 W, Strouhal and Reynolds numbers have lower and upper limits of 0,15 to 2,2 and from 4,2×10 3 up to 2,8×10 4 , respectively. Also, it is important to mention that the designed wings produced less power per flapping cycle with the increase of the airflow velocity.

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3D Simulations of Droplets Impacting Liquid Films: Crown Parameters Measurements

AIAA Scitech 2020 Forum, 2020

Geostrategic Conjuncture of Commercial and Civil Aviation at Portugal on Early 20th Century

AIAA Scitech 2020 Forum, 2020

Aerodynamic Breakup of a Single Droplet due to a Crossflowed Airstream

AIAA Scitech 2019 Forum, 2019

The Role of Injector Heat Transfer in Supercritical Injection Phenomena

AIAA Propulsion and Energy 2020 Forum, 2020

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