Icing
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. A Computational Modeling for Semi-Coupled Multiphase Flow in Atmospheric Icing Conditions
ABSTRACT: A two-dimensional second-order positivity-preserving finite volume upwind scheme is developed for a semi-coupled algorithm involving the air and droplet flow fields in the Eulerian frame, which shares the grid for each phase. Special emphasis is placed on the computational modeling, which is induced from a strongly-coupled algorithm that satisfies
J. Aerosp. Technol. Manag.. Publicado em: 2015-09
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2. Obtenção de gorduras zero trans por interesterificação quimica e caracterização para aplicação em alimentos / Obtaining zero trans fats by chemical interesterification and characterization for food applications
Chemical interesterification has been used as the main alternative for obtaining zero trans plastic fats. In particular, interesterification of liquid oils with fully hydrogenated oils (or hardfats) is the most versatile way for producing zero trans fats, yielding fat bases with different properties for food applications. In this work, blends of soybean oil
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2009
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3. Heat and mass transfer in two-phase flow around airfoils with aeronautical anti-ice systems. / Transferência de calor e massa no escoamento bifásico em torno de aerofólios equipados com sistemas de antigelo aeronáuticos.
It is required to prevent ice accretion on wings and horizontal stabilizers because it may cause aerodynamic performance degradation, weight increase, flight control difficulties and, in critical cases, may lead to operational safety margins reduction. When aircraft flies through clouds containnig supercooled water droplets, which are in metastable equilibri
Publicado em: 2009
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4. Thermal boundary layer effects in aeronautical airfoils icing accretion. / Efeitos da camada limite térmica na formação de gelo em aerofólios de uso aeronáutico.
O modelo de avaliação da camada limite dinâmica e térmica foi implementado, no presente trabalho, em um código numérico para o cálculo do coeficiente de transferência de calor convectivo sobre aerofólios de uso aeronáutico com formação de gelo. Foram considerados, no modelo da camada limite turbulenta, os efeitos da rugosidade equivalente do grã
Publicado em: 2009
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5. Panorama da saúde mental pública no Distrito Federal de 1987 a 2007 : um estudo exploratório sobre a reforma psiquiátrica no DF
This paper aims at the establishment of a scenario of public mental health care in Distrito Federal (DF), Brazil, from 1987 to 2007, regarding the transformation of the field, due to the national psychiatric reform. The studys temporal scope was engendered by the fact that 1987 is the start-off landmark year of psychiatric reform in Brazil, and 2007, the ini
Publicado em: 2009
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6. Reynolds number effect on the heat transfer mechanisms in aircraft hot air anti-ice system.
The primary means of preventing ice formation on wings and engine inlets for modern commercial transport aircraft is by extracting hot air from the compressor and blowing it on the inside surface of the leading edge through small holes drilled in the so-called piccolo tube system. A critical aspect in the design of such system is the prediction of heat trans
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2008
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7. Estudo numerico-experimental do armazenamento de energia em capsulas esfericas e recipientes reciclaveis / Numerical-experimental study of the storage of energy in spherical capsules and recycled container
The present work looked for to get of a detailed form the similar process of icing in the interior of spherical capsules and geometrias for the storage of thermal energy being used water and water-polietilenoglicol as PCM. A composed group of benches of test of a controlled tank of cooling and with precision was mounted of ±1 ºC. Capsules used in the tests
Publicado em: 2008
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8. Esquema numérico com reconstrução mínimos quadrados de alta ordem em malhas não-estruturadas para a formulação euleriana do transporte de partículas / Numerical scheme with high order least square reconstruction on unstructured grid to eulerian formulation of the particle transport
The particle transport study has a fundamental importance in diverse research area like in the icing accretion on an aircraft because that can affect its sustentation and stability. The concern is so big that many researches have been carried through, resulting in computational codes like the LEWICE in the United States, TRAJICE in the United Kingdom, ONERA
Publicado em: 2008
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9. Uso de película comestível, cloreto de cálcio e ácido ascórbico para a conservação do melão Amarelominimamente processado / Application of edible coating, calcium chloride and ascorbic acid for conservation of minimally processed melon
This work aims to evaluate the effect of the use of edible film, ascorbic acid and calcium chloride on the conservation of minimally processed melon. In order to obtain a convenient product, the microbiological aspects have been studied in order to evaluate the effect of the treatments on the respiratory rate and ethylene production of melons during the refr
Publicado em: 2008
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10. Modelagem e simulação da operação de sistema antigelo eletrotérmico de um aerofólio. / Modeling and simlulation of an electro-thermal airfoil anti-ice system operation.
An electro-thermal anti-ice system was simulated with a mathematical model developed in the present work. A 44.7 m/s (100 mph) and 89.4 m/s (200 mph) full potential flow around a 0.914 m (3 ft) chord NACA0012 airfoil with 0° angle of attack and the local water catch efficiency of 20 μm median volumetric diameter droplets impingement were calculated by
Publicado em: 2002
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11. Biocidal Properties of Anti-Icing Additives for Aircraft Fuels
The biocidal and biostatic activities of seven glycol monoalkyl ether compounds were evaluated as part of an effort to find an improved anti-icing additive for jet aircraft fuel. Typical fuel contaminants, Cladosporium resinae, Gliomastix sp., Candida sp., Pseudomonas aeruginosa, and a mixed culture containing sulfate-reducing bacteria were used as assay org
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12. Ice-Encasement Injury to Microsomal Membranes Isolated from Winter Wheat Crowns 1: II. Changes in Membrane Lipids during Ice Encasement
The physical properties and chemical composition of microsomal membranes were examined during a 7 day period of ice encasement in crown tissue of winter wheat (Triticum aestivum L. cv Norstar). Membrane damage, detected as an increase in microviscosity and electrolyte leakage, began between 1 and 3 days of icing, and was associated with a reduction in the re