Thermal Conductivity Procedure
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Effects of Local Heat Input Conditions on the Thermophysical Properties of Super Duplex Stainless Steels (SDSS)
The properties of the super duplex stainless steels (SDSS) are strongly affected by the thermal history imposed by welding procedures. The controlled dual phase microstructure (ferrite and austenite) guarantee excellent mechanical properties such as mechanical strength and corrosion resistance, in addition to small thermal expansion coefficient and high ther
Mat. Res.. Publicado em: 11/01/2018
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2. Thermal conductivity of gas by pulse injection techniques using specific thermal conductivity detector (TCD)
Este artigo apresenta um procedimento para determinar a condutividade térmica de gases através de injeção por pulso, utilizando um detector de condutividade térmica (TCD). As medidas foram efetuadas à 323K e pressão atmosférica, com um sensor de filamento de tungstênio de 160 Ω. Através de aproximações bem definidas, foi possível transformar um
Publicado em: 2010
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3. Compósitos cerâmicos porosos de alumina - zircônia para aplicação em sistemas de controle térmico para satélites: obtenção e caracterização / Alumina-zirconia porous ceramic composites for application in satellite thermal control systems: obtaining and characterization
To control the temperature of satellites are used various thermal control heat systems. The Loop Heat pipe (LHP) are being developed at the DEM (Space Mechanic and Control Division) of the INPE (National Institute for Space Research) an apparatus for passive heat control of the satellites components. The main components of the LHP system are: capillary evapo
Publicado em: 2008
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4. Avaliação do potencial fisiológico, métodos de condicionamento e desempenho de sementes de couve-flor (Brassica oleracea L. var. botrytis) durante o armazenamento e em campo / Evaluation of the physiological potential, priming methods and performance of cauliflower (Brassica oleracea L. var. botrytis) seedlots
The objectives of this research were to identify reliable methods to evaluate the physiological potential of cauliflower seeds, verify the relationship between seed physiological potential and field performance, as well as to define a suitable procedure for seed priming and identify efficient drying methods to avoid the possible reversion of beneficial primi
Publicado em: 2006
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5. Multidimensional modelling and calculation of combustion in porous media
In contrast with household heating systems based on open combustion flames, burners based on premixed combustion in inert porous media are characterized by higher thermal efficiency and high turndown ratio allied with compacity of the units. Moreover, porous burners, where a flame is anchored inside a porous matrix, are associated with low pollutants formati
Publicado em: 2005
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6. FINITE ELEMENT SIMULATION OF THE COOLING PHASE OF ROTATIONAL MOLDING PROCESS / SIMULAÇÃO VIA ELEMENTOS FINITOS DA ETAPA DE RESFRIAMENTO DA MOLDAGEM ROTACIONAL
The purpose of the present work was to simulate the cooling phase of the rotational molding in order to evaluate the influence of some variables in the cooling time, that is the longest one in the process. ANSYSTM software was used to perform the simulation using the finite element method, thus it will be possible to work with complex geometries in future wo
Publicado em: 2004
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7. Determinação da condutividade termica e da resistencia mecanica em argamassa leve
This work deals the determination of the thermal conductivity and the mechanical strength in light mortar with soft aggregate, evidencing the features term-insulators of the composite and analysis of the main aspects of the cement composite, concerning to its mechanical characteristics. The procedure adopted for determination of thermal conductivity, has the
Publicado em: 2000
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8. Efeito do molibdênio no comportamento em fadiga térmica de ferros fundidos vermiculares
The compacted grapite iron is a suitable material for application on components subject to thermal shock and thermal variation. This material shows a good combination o f properties like thermal conductivity, strength and toughness. By this way, the availability o f information about the influence o f chemical composition over performance under thermal condi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 1999
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9. Determinação de parametros em processos reativos industriais
In this work, a procedure for the estimation of kinetic and heat transfer parameters in fixed bed reactors is proposed. A two-dimensional steady-state pseudo-homogeneous model is developed for the reactor representation, where heat transfer phenomena are taken into account by an effective thermal conductivity and the wall heat transfer coefficienl. Parameter
Publicado em: 1995
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10. Blendas de polipirrol e poli(cloreto de vinila) : propriedades termicas, mecanicas e eletroquimicas
Blends including an intrinsically conductive polymer, polypyrrole or polythiophene, and an insulating polymer, PVC, were prepared. The method used was the oxidative chemical polymerization of the heterocyclic monomers, in the vapor phase, in PVC films impregnated with an oxidant agent (FeCl3). This procedure was efficient for the preparation of blends compos
Publicado em: 1995
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11. Kinetic theory of quantum ideal gases. / Teoria cinética dos gases ideias quânticos.
The aim of this work is the determination of the coefficients of shear viscosity and thermal conductivity of quantum ideal gases. In the calculation of the transport coefficients two aspects have been taken into account: a classical statistical with quantum cross-sections and a quantum statistical with quantum cross-sections. In the first case, an alternativ
Publicado em: 1993
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12. Rapid Method for the Radioisotopic Analysis of Gaseous End Products of Anaerobic Metabolism
A gas chromatographic procedure for the simultaneous analysis of 14C-labeled and unlabeled metabolic gases from microbial methanogenic systems is described. H2, CH4, and CO2 were separated within 2.5 min on a Carbosieve B column and were detected by thermal conductivity. Detector effluents were channeled into a gas proportional counter for measurement of rad