Thermal Conductivity
Mostrando 13-24 de 276 artigos, teses e dissertações.
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13. Production of Carbon Foams from Rice Husk
The production of a material with rigid, multifunctional three-dimensional porous structure at a low cost is still challenging to date. In this work, a light and rigid carbon foam was prepared using rice husk as the basic element through a simple fermentation process followed by carbonization. For the fermentation process, the amount of biological yeast (7.5
Mat. Res.. Publicado em: 11/11/2019
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14. Phase Separation and Development of the Microstructure for Stainless Steel to Copper Alloy Weld Joints Using a Fiber Laser
ABSTRACT Stainless steel and copper alloys joints are often applied in aerospace, marine and power industries where both high thermal and electrical conductivity (Cu) and corrosion resistance (steel) are required. In the aerospace industry, in particular for the combustion chamber of rocket engines, copper and steel combinations offer perfect materials selec
J. Aerosp. Technol. Manag.. Publicado em: 10/10/2019
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15. THERMAL CONDUCTIVITY ENHANCEMENT OF AQUEOUS IONIC LIQUID AND NANOPARTICLE SUSPENSION
Abstract In the present study, the thermal conductivities of ionic liquid + water in the concentrations 0.1-0.6 %w/w and temperatures (302.5-337.9 K) are determined. The thermal conductivity of aqueous 1-butyl-3-methylimidazolium bromide declined with increasing concentration and temperature. A quadratic model is developed for predicting the thermal conducti
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
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16. Influência de interfases sobre a condutividade térmica efetiva de compósitos periódicos reforçados por fibras
RESUMO Os materiais compósitos comumente apresentam delgadas regiões ou interfases localizadas entre a matriz e as inclusões. Estas interfases têm influência no comportamento efetivo do compósito. Em diversas aplicações, os compósitos estão sujeitos a variações significativas de temperatura e, consequentemente, a condutividade térmica efetiva de
Matéria (Rio J.). Publicado em: 16/09/2019
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17. Influence of graphene oxide on ‘in situ’ preparation of nanocomposites with polyvinyl butyral
ABSTRACT In this work, polyvinyl butyral (PVB) nanocomposites reinforced with 0.5 to 2.5 wt% of graphene oxide (GO) were synthesized via ‘in situ’ polymerization. PVB was obtained by condensation of hydroxyl groups of polyvinyl alcohol (PVA) with butyraldehyde (BU) Thermogravimetric analyzes (TGA) showed the increase in the thermal conductivity of the na
Matéria (Rio J.). Publicado em: 16/09/2019
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18. THE EFFECT OF CELLULOSE NANOCRYSTALS IN SUGARCANE BAGASSE PARTICLEBOARDS OF PITH AND FIBERS
ABSTRACT The aim of this research was to investigate sugarcane bagasse (SCB) particleboards, using two kinds of particles, from pith and fibers, reinforced with cellulose nanocrystals (NCC). The NCCs were dispersed in the adhesive urea formaldehyde (UF) using a sonificator in two proportions (0 and 1%). The NCCs and UF were applied in the SCB particles using
CERNE. Publicado em: 09/09/2019
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19. Influência do Regime Transiente Sobre a Microdureza e Microestrutura nos Aços ASTM-A36 e SAE-1045 Soldados pelo Processo MAG
Resumo O regime quase-estacionário pode não ser alcançado em soldagens a arco elétrico de peças de pequenas dimensões e/ou de materiais de maior condutividade térmica. Entretanto, o regime transiente sempre ocorrerá no início e no final da soldagem. Neste regime, a variação do fluxo de energia via calor pode promover variações microestruturais e
Soldag. insp.. Publicado em: 08/08/2019
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20. Effects of Heat Treatment on the Relative Amounts of Cellulose in Nanosilver-Impregnated and Untreated Poplar Wood (Populus alba)
ABSTRACT The present study investigated the effect of heat treatment on the relative amount of cellulose in untreated and nanosilver-impregnated poplar wood (Populus alba). The impacts on physical and mechanical properties were further studied. Specimens were heated at 145°C and 165°C in hot air medium. In order to enhance heat transfer to the inner parts
Floresta Ambient.. Publicado em: 29/07/2019
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21. SIMULATION OF THERMAL DECOMPOSITION IN AN OPEN CAVITY: ENTROPY ANALYSIS
ABSTRACT This paper presents a numerical analysis of entropy generation in a two-dimensional rectangular channel where the inlet flow undergoes thermal decomposition resulting from a chemical reaction. The model considered viscosity and thermal conductivity to be dependent of temperature. Irreversibility due to mass transport was included in the entropy gene
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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22. THERMOPHYSICAL PROPERTIES OF 1-ETHYL-3-METHYLIMIDAZOLIUM CHLORIDE SOLUTION FROM 293.15 TO 323.15 K
ABSTRACT Aqueous systems composed of ionic liquid make up a new alternative for use in processes involving the separation of biomolecules. The objective of this experiment was to obtain the thermo-physical properties of density, refractive index, electrical conductivity, molar volume, thermal expansion coefficient and apparent specific volume of the ionic li
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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23. Thermomechanical Characteristics of a Functionally Graded Mounted Uniform Disc with/without Rigid Casing
ABSTRACT In the present paper, thermomechanical attributes of a power-law graded uniform mounted disc with or without rigid casing are investigated analytically under centrifugal and steady-state thermal loads within the framework of axisymmetric infinitesimal plane-stress elasticity theory. Young's modulus, material density, thermal expansion coefficient an
J. Aerosp. Technol. Manag.. Publicado em: 13/06/2019
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24. Desempenho térmico-acústico-mecânico de um compósito de matriz cimentícia leve reforçado com casca de arroz
RESUMO Visando desenvolver um novo produto com bom desempenho térmico-acústico-mecânico para servir como alternativa aos materiais comumente utilizados para vedação, foi produzido um compósito a partir de uma matriz cimentícia leve e casca de arroz. A matriz cimentícia consistindo em uma pasta de cimento com ar incorporado, que é intitulada por vár
Matéria (Rio J.). Publicado em: 10/06/2019