Drop Condensation
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Dimensional analysis and empirical correlations for heat transfer and pressure drop in condensation and evaporation processes of flow inside micropipes: case study with carbon dioxide (CO2)
In this paper, the experimental results of the convection heat transfer coefficient and pressure drop values during condensation and evaporation of CO2 were obtained at different operating conditions for flow inside micropipes. Reynolds number (ReD) ranged between 2000 and 15000. The dimensional analysis technique was utilized to develop correlations for Nus
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
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2. Dimensionamento de um umidificador para células a combustível em aplicações móveis / Design of a Humidifier for Fuel Cells in Mobile Applications.
Células a combustível geram energia a partir de um processo eletroquímico decorrente de uma reação química, com a presença de átomos de hidrogênio e oxigênio, ocorrendo à liberação de prótons de hidrogênio (H+) e de elétrons de oxigênio (O2-), para obtenção de energia elétrica, calor (produtos) e água (subproduto). Dentre os modelos de m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2011
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3. Effect of conventional and experimental gingival retraction solutions on the tensile strength and inhibition of polymerization of four types of impression materials
In the present study, two types of tests (tensile strength test and polymerization inhibition test) were performed to evaluate the physical and chemical properties of four impression materials [a polysulfide (Permlastic), a polyether (Impregum), a condensation silicone (Xantopren) and a polyvinylsiloxane (Aquasil),3; when polymerized in contact with of one c
Journal of Applied Oral Science. Publicado em: 2008-08
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4. Biofilter efficiencies in the purification and deodorization of hydrogen sulfide emissions / Desempenho de filtro biológico na depuração e desodorização de emissões de sulfeto de hidrogênio
Traditionally the industrial waste gases have been treated by physical-chemical processes, such as scrubbers, absorption, condensation and oxidation. Although these techniques presented great efficiency, the need to add chemical products and the replacement of adsorbent results in relatively high operational costs compared to biological treatment techniques.
Publicado em: 2007
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5. Análise de trocadores de calor compactos para desumidificação de ar. / Analysis of compact heat exchanger for air dehumidification.
The objective of this work is to conduct a parametric analysis of the dehumidification process of compressed air in compact heat exchangers with Offset Strip Fins. The humidity carried by the compressed air should be removed from the system to prevent the condensation in the distribution lines and in the actuators or the final devices. The dehumidification p
Publicado em: 2006
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6. Estudo do desempenho de um precipitador eletrostático operando na captura de partículas submicrométricas e nanométricas.
The removal of submicron particles from gaseous streams is becoming an increasingly important operation, both in industrial (nanotechnology) as well as in occupational (inhalation of particula te matter) applications. Among the equipments commonly employed for the removal of particula tes of the gaseous stream, the electrostatic precipitator, ESP, is the one
Publicado em: 2005
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7. Liquido de eletron-buraco em GaS
Photoluminescence measurements have been performed under high excitation levels and low temperatures (<10K) condition. This work aims to explain the appearance of a broad band which dominates the spectrum, upon passing from a low into a high excitation level. Its intensity is highly dependent of the excitation. When temperature is rised from 2 K up to 10 K t
Publicado em: 1980
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8. Constitutive Overexpression of Cytosolic Glutamine Synthetase (GS1) Gene in Transgenic Alfalfa Demonstrates That GS1 May Be Regulated at the Level of RNA Stability and Protein Turnover1
Glutamine synthetase (GS) catalyzes the ATP-dependent condensation of NH4+ with glutanate to yield glutamine. Gene constructs consisting of the cauliflower mosaic virus (CaMV) 35S promoter driving a cytosolic isoform of GS (GS1) gene have been introduced into alfalfa (Medicago sativa). Although transcripts for the transgene were shown to accumulate to high l
American Society of Plant Physiologists.
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9. On the possibility of dust condensation in the ejecta of supernova 1987a
We suggest that supernova 1987a may condense dust of substantial visual optical thickness as do many novae. The dust will act as a calorimeter of the photon luminosity of any central engine that is dominant at the time of dust formation. Observations of novae suggest that dust formation may occur when the expanding ejecta reach a temperature of 1000 K. The e
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10. Full deacylation of polyethylenimine dramatically boosts its gene delivery efficiency and specificity to mouse lung
High-molecular-mass polyethylenimines (PEIs) are widely used vectors for nucleic acid delivery. We found that removal of the residual N-acyl moieties from commercial linear 25-kDa PEI enhanced its plasmid DNA delivery efficiency 21 times in vitro, as well as 10,000 times in mice with a concomitant 1,500-fold enhancement in lung specificity. Several additiona
National Academy of Sciences.