Vacuum Modeling
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Steel desulfurization on RH degasser: physical and mathematical modeling
Abstract Due to the high-quality steel demand, especially for ultra-low Sulfur steel, RH desulfurization has been practiced. Based on this, mathematical and physical modeling have been applied to study steel desulfurization by reagent addition in the RH degasser vacuum chamber. The main result of cold modeling, using water and oil emulating steel and slag, r
REM - International Engineering Journal. Publicado em: 2022
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2. MODELING AND SIMULATION OF A VACUUM MEMBRANE DISTILLATION PLANT COUPLED WITH SOLAR ENERGY AND USING HELICAL HOLLOW FIBERS
Abstract This paper investigates the effect of operating conditions such as coil pitch, fiber diameter, distance between fiber and absorber internal wall and absorber diameter for a vacuum membrane installation coupled with solar energy and using helically coiled fiber to maximize the permeate flow rate. The model is based on a system of equations composed o
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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3. Drying kinetics modeling of apple and zucchini slices vacuum impregnated with anthocyanins
RESUMO: O objetivo deste trabalho foi estudar a cinética de secagem de fatias de maçã e abobrinha enriquecidas com antocianinas e avaliar a influência da temperatura de secagem no teor de antocianinas de discos de maçã e abobrinha. Fatias de maçã (Granny Smith) e abobrinha (Cucurbita pepo) foram enriquecidas com antocianinas por impregnação a vác
Cienc. Rural. Publicado em: 03/10/2019
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4. Artificial neural networks modeling of kinetic curves of celeriac (Apium graveolens L.) in vacuum drying
Abstract The objective of this study was to predict celeriac drying curves using artificial neural networks (ANNs). The experimental data for vacuum drying kinetics of celeriac slices reported by other researcher in the previously published article was used. The air temperature, chamber pressure and time values were used as ANN inputs. To predict the moistu
Food Sci. Technol. Publicado em: 30/07/2018
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5. Annealing and Extended Etching Improve a Torsional Resonator for Thin Film Internal Friction Measurements
We evaluate two methods to improve the background internal friction of the Double Paddle Oscillator (DPO), which has a nominal low temperature value of Q-1 ≈ 2×10-8. We find that annealing the DPO in vacuum at 300°C for 3 hours systematically reduced Q-1 at all temperatures and revealed a 100K internal friction peak by permanently removing it. We also fi
Mat. Res.. Publicado em: 18/06/2018
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6. Self-Organization in Ionic Liquids: From Bulk to Interfaces and Films
In this contribution we present an overview on the relation between the complex structure of ionic liquids (ILs) and its impact in the field of surface science. The results herein described result mainly from modeling and simulation work carried out at Centro de Química Estrutural, Universidade de Lisboa, complemented in some cases by experimental results o
J. Braz. Chem. Soc.. Publicado em: 2016-02
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7. Modelagem e simulação do processo de fermentação extrativa a vácuo com uma câmara de flash e separação do CO2 utilizando uma coluna de absorção / Modeling and simulation of the vacuum extractive fermentation process using a flash chamber and an absorption column for CO2 separation
The ethanol, also known as bioethanol, shows positive characteristics for being used as a large scale fuel, mainly because of the relatively low cost, low pollutant impact compared to fossil fuels and its feasibility of being produced from a renewable matrix through fermentation of vegetable origin products. The conventional fermentation process is typically
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/07/2011
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8. Study of physical deacidification of the vegetable oils using model systems / Estudo da desacidificação por via fisica de oleos vegetais utilizando sistemas-modelos
The steam deacidification step must be designed in order to take into account the high difference in the volatility of undesirable compounds and the neutral oil under high temperatures and vacuum, without causing damage to nutraceutical compounds, excessive production of trans fatty acids and neutral oil loss. To improve the process conditions of this import
Publicado em: 2009
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9. Avaliação do fluxo de nêutrons e da taxa de dose durante o funcionamento nominal do ITER
The ITER (International Thermonuclear Experimental Reactor) is a tokamak with elongated plasma and single null poloidal divertor. The nominal inductive operation produces a DT fusion power of 500 MW for a burn length of 400 s, with a pulse repetition period as short as 1,800 s. The main goal is to exhibit the use of fusion energy for peaceful purposes. The t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/07/2008
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10. Computational Modeling of field emission tips / Modelamento computacional de ponteiras de emissão de campo
This work aims to study the electrical behavior of a field emission tip, shaped in the form hemisphere on a post, through computational resources (simulations). We chose the Ansys commercial software that uses the finite element methods in the analyses of the physical phenomena to obtain the electric field in the surface of the tip. After that, a computation
Publicado em: 2007
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11. Modelamento computacional de ponteiras de emissão de campo / Computational modeling of field emission tips
Este trabalho tem como objetivo o estudo do comportamento elétrico de uma ponteira de emissão de campo, modelada na forma de um hemisfério sobre um poste, através de recursos computacionais (simulações). Escolhemos o software comercial Ansys, que utiliza o método dos elementos finitos nas análises dos fenômenos físicos para obtenção do campo elé
Publicado em: 2007
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12. Contributions to analysis, calculation and modeling of vacuum systems / Contribuições para analise, calculo e modelagem de sistemas de vacuo
O principal objetivo deste trabalho foi contribuir para o cálculo, análise e modelagem de sistemas de vácuo de uso geral. As contribuições ocorreram na criação, desenvolvimento e aprimoramento de ferramentas matemáticas tanto analíticas como numéricas para modelar e analisar detalhadamente sistemas de vácuo. Foram consideradas duas maneiras de mod
Publicado em: 2006