Maria Grazia De Giorgi, Aldebara Sciolti, Antonio Ficarella,
The present work focuses on the numerical modeling of combustion in liquid-propellant rocket engines. Pressure and temperature are well above thermodynamic critical points of both the propellants and then the reactants show liquid-like characteristics of density and gas-like characteristics for diffusivity. The aim of the work is an efficient numerical description of the phenomena and RANS simulations were performed for this purpose. Hence, in the present work different kinetics, combustion models ...
Tópico(s): Advanced Combustion Engine Technologies
2014 - Multidisciplinary Digital Publishing Institute | Energies
Elisa Pescini, Maria Grazia De Giorgi, Luca Francioso, Aldebara Sciolti, Antonio Ficarella,
A dielectric barrier discharge plasma actuator (PA) was designed and manufactured with microscale dimensions using photolithographic process on fibre glass substrate. AC operation under sinusoidal voltage was investigated experimentally by means of electrical characterisation, smoke flow visualisations and particle image velocimetry. The performances of the micro PA were evaluated and compared with the ones of a macro PA found in this literature. The velocity induced by the micro PA was comparable ...
Tópico(s): Aerosol Filtration and Electrostatic Precipitation
2014 - Institution of Engineering and Technology | IET Science Measurement & Technology
Maria Grazia De Giorgi, Aldebara Sciolti, Stefano Campilongo, Elisa Pescini, Antonio Ficarella, Luca Martini, Paolo Tosi, Giorgio Dilecce,
In recent years, the application of plasma actuators in different engineering fields was considered particularly interesting. It was successfully applied for the cold flow control in aero engines and turbo-devices. One important application concerns the use of non-equilibrium plasma for plasma-assisted ignition and combustion control. The reduction of nitric oxides (NOx) in aircraft engines, gas turbines, or internal combustion engines has become a major issue in the development of combustion systems. ...
Tópico(s): Plasma and Flow Control in Aerodynamics
2015 - Elsevier BV | Energy Procedia
Maria Grazia De Giorgi, Aldebara Sciolti, Stefano Campilongo, Antonio Ficarella,
In the present work, an experimental investigation was performed by varying the fuel/air ratio of a liquid-fuel gas turbine derived burner in the non-premixed mode, until an ultra-lean combustion condition was reached. In this condition, flame instabilities occur with negative impacts on combustion efficiency. Two high speed visualization systems in the visible range and in the infrared spectral region were used. Moreover, they were supported by an OH⁎ chemiluminescence measurement and by gas exhaust ...
Tópico(s): Radiative Heat Transfer Studies
2015 - Elsevier BV | Aerospace Science and Technology
Maria Grazia De Giorgi, Aldebara Sciolti, Stefano Campilongo, Antonio Ficarella,
Reduction of nitric oxides (NOx) in aircraft engines and in gas turbines by lean combustion is of great interest in the design of novel combustion systems. However, the stabilization of the flame under lean conditions is a main issue. In this context, the present work investigates the effects of sinusoidal dielectric barrier discharge (DBD) on a lean inverse diffusive methane/air flame in a Bunsen-type burner under different actuation conditions. The flame appearance was investigated with fixed methane ...
Tópico(s): Plasma and Flow Control in Aerodynamics
2017 - Multidisciplinary Digital Publishing Institute | Energies
Maria Grazia De Giorgi, Antonio Ficarella, Aldebara Sciolti, Elisa Pescini, Stefano Campilongo, Giorgio Di Lecce,
Low environmental impact is a main issue in the design of novel combustion systems, as aircraft engines. In this context, the present work investigates the possibility to increase the combustion efficiency of a lean flame through the use of sinusoidally driven dielectric barrier discharge (DBD) plasma actuator. The effect of the plasma discharge on a lean non premixed methane/air flame in a Bunsen-type burner has been studied for two different configurations: the normal diffusive flame (NDF) and the ...
Tópico(s): Plasma Diagnostics and Applications
2017 - Elsevier BV | Energy
Produção Nacional
Revisado por pares
João Paulo Barbosa de Almeida, Vagner Bezerra dos Santos, Gustavo Nascimento, Willian Toito Suarez, W.M. de Azevêdo, Aldebarã Fausto Ferreira, Matheus Valentin Maia,
A simple, low-cost and easy-to-handle procedure based on carbon quantum dots is proposed to check commercially available formulated microbicides that are used to mitigate the transmission of viruses, such as SARS-COV-2, or bacterial diseases.
Tópico(s): Biosensors and Analytical Detection
2022 - Royal Society of Chemistry | Analytical Methods
Maria Grazia De Giorgi, Aldebara Sciolti, Stefano Campilongo, Elisa Pescini, Antonio Ficarella, Sara Lovascio, Giorgio Dilecce,
The aim of this paper is the use of optical sensors to recognize lean blowout in a non-premixed methane/air burner, Bunsen-type, and the use of plasma actuators for flame control and stabilization. The burner is optically accessible to permit the imaging acquisitions of the flame region. The plasma actuation regards alternatively the air flow and the fuel flow. The electric field is generated using a fixed configuration of plasma actuator and the dielectric barrier discharge (DBD) but using two different ...
Tópico(s): Plasma Diagnostics and Applications
2016 - IEEE Sensors Council | IEEE Sensors Journal
Produção Nacional
Revisado por pares
Aldebarã Fausto Ferreira, S.L. Campello, Ana Cláudia Vaz de Araújo, A.R. Rodrigues, Giovannia A. L. Pereira, W.M. de Azevêdo,
A new one-pot ultrasound methodology to prepare stable water-dispersible superparamagnetic Fe3O4@alginate nanocomposite was investigated. The radical hydroxyl (HO⋅) produced during ultrasound cavitation process was applied to oxidize ferrous (Fe2+) to ferric (Fe3+) cations in a 1.0 mol L−1 NaOH solution to obtain Fe3O4 nanoparticles. Structure, morphology, size, and magnetic property were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Dynamic Light Scattering (DLS), Scanning ...
Tópico(s): Minerals Flotation and Separation Techniques
2022 - Elsevier BV | Solid State Sciences
Maria Grazia De Giorgi, Aldebara Sciolti, Stefano Campilongo, Antonio Ficarella,
The article presents the data related to the flame acquisitions in a liquid-fuel gas turbine derived burner operating in non-premixed mode under three different equivalence fuel/air ratio, which corresponds to a richer, an intermediate, and an ultra-lean condition, near lean blowout (LBO). The data were collected with two high speed visualization systems which acquired in the visible (VIS) and in the infrared (NIR) spectral region. Furthermore chemiluminescence measurements, which have been performed ...
Tópico(s): Fire Detection and Safety Systems
2015 - Elsevier BV | Data in Brief
Tópico(s): History, Culture, and Society
1969 - Duke University Press | Hispanic American Historical Review
Arturo de Risi, Teresa Donateo, Aldebara Sciolti, Michele Calò, Maria Rosaria Gaballo,
The aim of this work is the development of an energy, based model to predict primary break,up of urea and water (Ad Blue) sprays in condition typical of Selective Catalyst Reduction (SCR) systems. The atomization model for Ad Blue injection, developed in the present investigation, performs an energy balance of the liquid column to asses its deformation near the nozzle exit and to predict the dimension of droplets after the primary break,up. To formulate the energy balance it is necessary to evaluate ...
Tópico(s): Electrohydrodynamics and Fluid Dynamics
2009 - | SAE technical papers on CD-ROM/SAE technical paper series
Maria Grazia De Giorgi, Aldebara Sciolti, Stefano Capilongo, Antonio Ficarella,
In the present work the performance of a multipoint lean direct injection strategy for low emission aero-propulsion systems has been experimentally and numerically investigated, and compared with the single point injection strategy. A swirler liquid fueled combustor was designed and used in experiments to investigate the flame behavior in lean and ultra-lean conditions for both the single-point and the multi-points injection strategies. Multipoint injection has been realized injecting an amount ...
Tópico(s): Fire dynamics and safety research
2016 - Elsevier BV | Energy Procedia
Produção Nacional
Revisado por pares
Tahir, Guilherme C. Concas, Mariana Gisbert, M. Cremona, Fernando Lazaro, M.E.H. Maia da Costa, Suellen D. T. De Barros, Ricardo Q. Aucélio, Tatiana Dillenburg Saint’Pierre, José Marcus Godoy, Diogo Mendes, G. Mariotto, N. Daldosso, Francesco Enrichi, Alexandre Cuin, Aldebarã Fausto Ferreira, W.M. de Azevêdo, Gerónimo Pérez, Celso Sant’Anna, Bráulio S. Archanjo, Yordy E. Licea, André L. Rossi, Francis Leonard Deepak, Rajwali Khan, Quaid Zaman, Sven Reichenberger, Theo Fromme, Giancarlo Margheri, J.R. Sabino, Gabriella Fibbi, Mario Del Rosso, Anastasia Chillà, Francesca Margheri, Anna Laurenzana, Tommaso Del Rosso,
Over the last decade, the CO 2 reduction reaction (CO 2 RR) has been increasingly exploited for the synthesis of high‐value raw materials in gaseous or liquid form, although no examples of CO 2 fixation in nanoparticle systems have been demonstrated. Herein, CO 2 fixation into solid nanomaterials by laser synthesis and processing of gold colloids in water, traditionally considered a green approach leading to ligand‐free nanoparticles without the formation of by‐products, is reported. If carbon monoxide‐ ...
Tópico(s): Catalytic Processes in Materials Science
2024 - Wiley | Small Science
Produção Nacional
Revisado por pares
Joana Eliza de Santana, Fábio Gabriel Silva de Andrade, Aldebarã Fausto Ferreira, Marcos Gomes Ghislandi, Maurı́cio Alves da Motta Sobrinho,
Tópico(s): Extraction and Separation Processes
2024 - Springer Science+Business Media | Environmental Science and Pollution Research
Produção Nacional
Revisado por pares
Daniel da Silva Lima, Aldebarã Fausto Ferreira, Stterferson E. Silva, Severino Alves, Felipe L. N. Sousa, W.M. de Azevêdo,
This work reports the interaction of γ-rays with MoO3 in several solvents to obtain non-stoichiometric (sub-oxide) MoO3-x through a one-pot synthesis. The effect of different doses of γ-radiation (30-90 kGy) with different protic solvents (water, N,N-dimethylformamide and formic acid) was investigated. Structural modifications were characterized by X-ray diffractometry and scanning electron microscopy while optical properties were investigated by UV-Vis spectroscopy. The analysis of the highly intense ( ...
Tópico(s): TiO2 Photocatalysis and Solar Cells
2023 - Royal Society of Chemistry | Dalton Transactions
Tahir, Guilherme C. Concas, Mariana Gisbert, M. Cremona, Fernando Lazaro, M.E.H. Maia da Costa, Suellen D. T. De Barros, Ricardo Q. Aucélio, Tatiana Dillenburg Saint’Pierre, José Marcus Godoy, Diogo Mendes, G. Mariotto, N. Daldosso, Francesco Enrichi, Alexandre Cuin, Aldebarã Fausto Ferreira, W.M. de Azevêdo, Gerónimo Pérez, Celso Sant’Anna, Bráulio S. Archanjo, Yordy E. Licea, André L. Rossi, Francis Leonard Deepak, Rajwali Khan, Quaid Zaman, Sven Reichenberger, Theo Fromme, Giancarlo Margheri, J.R. Sabino, Gabriella Fibbi, Mario Del Rosso, Anastasia Chillà, Francesca Margheri, Anna Laurenzana, Tommaso Del Rosso,
Tópico(s): Catalysis and Oxidation Reactions
2024 - Wiley | Small Science
Produção Nacional
Revisado por pares
Tahir, Guilherme C. Concas, Mariana Gisbert, M. Cremona, Fernando Lazaro, M.E.H. Maia da Costa, Suellen D. T. De Barros, Ricardo Q. Aucélio, Tatiana Dillenburg Saint’Pierre, José Marcus Godoy, Diogo Mendes, G. Mariotto, N. Daldosso, Francesco Enrichi, Alexandre Cuin, Aldebarã Fausto Ferreira, W.M. de Azevêdo, Gerónimo Pérez, Celso Sant’Anna, Bráulio S. Archanjo, Yordy E. Licea, André L. Rossi, Francis Leonard Deepak, Rajwali Khan, Quaid Zaman, Sven Reichenberger, Theo Fromme, Giancarlo Margheri, J.R. Sabino, Gabriella Fibbi, Mario Del Rosso, Anastasia Chillà, Francesca Margheri, Anna Laurenzana, Tommaso Del Rosso,
CO2 Reduction Reaction In article number 2300328, Anna Laurenzana, Tommaso Del Rosso, and co-workers show the fixation of CO2 into solid nanomaterials in the colloidal phase by laser synthesis and processing of gold colloids in water, traditionally considered a green approach leading to ligand-free nanoparticles without the formation of by-products. The pulsed laser driven CO2 reduction reaction leads to the formation of carbon monoxide rich gold nanoparticles and organometallic nanocomposites composed ...
Tópico(s): Laser-induced spectroscopy and plasma
2024 - Wiley | Small Science
Produção Nacional
Renata Flávia Ferraz do Nascimento, Aldebarã Fausto Ferreira, G Carvalho, Sérgio de Lemos Campello, A.R. Rodrigues, W.M. de Azevêdo,
Tópico(s): Nanomaterials for catalytic reactions
2024 - Springer Science+Business Media | Journal of Nanoparticle Research
Produção Nacional
Revisado por pares
Aldebarã Fausto Ferreira, E.H.L. Falcão, W.M. de Azevêdo,
We present new results concerning the formation mechanism of lead carbonate (Pb3(CO3)2(OH)2) by laser ablation in ethanol, under controlled atmospheres. We suggest that carbon dioxide (CO2) is absorbed from ambient atmosphere and converted into carbonate in a reaction mediated by ethoxide anion produced during the ablation. Addition of 2,4,6 trinitrotoluene to the ablated solution and its subsequent reduction, followed by UV–Vis spectroscopy, supports this new mechanism. No carbonate precipitates ...
Tópico(s): Aerogels and thermal insulation
2023 - Elsevier BV | Materials Letters
Mayra Taniely Ribeiro Abade, Élcio Silvério Klosowski, Aldebarã Augusto Rafaeli, Fernanda Ludmyla Barbosa de Souza, Maria Soraia Fortado Vera Cruz, Karlene Fernandes de Almeida, Luane Laíse Oliveira Ribeiro,
A rúcula é uma hortaliça de porte herbáceo da família Brassicaceae, originária da região do Mediterrâneo e na última década, tem sido cultivada geralmente em ambiente protegido. Desse modo, o objetivo deste trabalho foi avaliar características agronômicas, em plantas de rúcula cultivadas em telados cobertos com sombrite nas cores preto, vermelho e prata a 50% de sombreamento e também plantas a pleno sol no inverno. O experimento foi conduzido em delineamento de blocos ao acaso, em esquema fatorial ...
Tópico(s): Banana Cultivation and Research
2021 - Brazilian Journal of Development | Brazilian Journal of Development