Heat Fluxes
Mostrando 1-12 de 62 artigos, teses e dissertações.
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1. Radiation Balance and Partitioning of Latent and Sensible Heat Fluxes Over a Lime Orchard in Eastern Amazon
Abstract We investigate the balance of radiation and energy over a lime orchard in Eastern Amazon and how it relates to environmental conditions. We found that lime trees aged between 6 and 7 years old reflect 11.0% to 14.5% of incoming shortwave radiation, and the latent heat flux corresponds to 57.6% and 66.6% of the daily net radiation in the dry season (
Revista Brasileira de Meteorologia. Publicado em: 2022
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2. Balanço de Energia, Emissão Foliar e Eficiência do Uso da Radiação pela Cana-de-Açúcar em Cultivo sem e com Palhada
Resumo Nas últimas décadas houve mudança no sistema de colheita e manejo da palhada em canaviais de todo o Brasil, visando atender a legislação vigente e reduzir custos. A deposição de resíduos culturais sobre o solo, contudo, modifica as características micrometeorológicas do ambiente. Este trabalho reporta um estudo conduzido em Juazeiro-BA, para
Rev. bras. meteorol.. Publicado em: 30/05/2019
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3. Thermal Analysis of Satellite Libertad 2: a Guide to CubeSat Temperature Prediction
ABSTRACT: We present a model for predicting the temperature of three-unit CubeSat on a low Earth orbit, which supposes a single temperature common to all satellite components. Our exposition includes a detailed, to a large extent analytical, computation of the external heat fluxes for a particular orbit and spacecraft assumptions based on the features forese
J. Aerosp. Technol. Manag.. Publicado em: 08/11/2018
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4. GREEN ROOF: SIMULATION OF ENERGY BALANCE COMPONENTS IN RECIFE, PERNAMBUCO STATE, BRAZIL
ABSTRACT Green roof is a technology that consists of the use of soil and vegetation installed in the roof of buildings, being a great solution to combat heat islands. Thus, this study aimed to compare micrometeorological changes and their effect on the energy balance of non-vegetated (slab) and vegetated building roofs by means of a simulation model calculat
Eng. Agríc.. Publicado em: 2018-06
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5. Configuration Study of Structurally Integrated Thermal Protection Systems for a Sub-Orbital Platform
ABSTRACT: The atmospheric hypersonic flight of sub-orbital and space vehicles generates aerodynamic heating and high wall heat fluxes, inducing high temperatures on the vehicle's structures and affecting their mechanical behavior, besides degrading the operation of board equipment. Furthermore, since payload preservation is always mandatory, the use of effic
J. Aerosp. Technol. Manag.. Publicado em: 2015-06
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6. TURBULENT EXCHANGE OF SCALARS ABOVE AND WITHIN AN ARAUCARIA FOREST IN SOUTHERN BRAZIL / TROCAS TURBULENTAS DE ESCALARES ACIMA E NO INTERIOR DE UMA FLORESTA DE ARAUCÁRIA NO SUL DO BRASIL
Turbulent exchange of scalars is analyzed for a year of turbulence data, above and within an Araucaria Forest in southern Brazil. Sensible and latent heat fluxes, as well as CO2 fluxes are calculated by the eddy covariance method and analyzed in terms of the seasonal variation of their daily cycles. Diurnal and nocturnal vertical velocity spectra, sensible a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/07/2011
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7. The numerical modeling of thermal turbulent wall flows with the classical κ - ε model
The goal of this work is to propose a new methodology to simulate turbulent thermal wall flows using the classical κ - ε model. The focus of this approach is based on the manner used to implement heat flux boundary conditions on the solid walls. In order to explain and to validate this new algorithm, several test cases are presented, testing a great range
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-03
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8. Boiling of R-134a in horizontal mini tube
This work presents the results of an experimental study carried out with R-134a to characterize heat transfer and pressure drop during flow boiling in a horizontal smooth tube of 2.6 mm ID. The experimental tests included (i) heat fluxes in the range from 10 to 100 kW/m², (ii) the refrigerant mass velocities set to discrete values in the range of 240-930 kg
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011
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9. Balanço de energia de uma pastagem cultivada no cerrado.
RESUMO: O cerrado possui aproximadamente 208 milhões de hectares sendo 49 milhões de pastagens cultivadas. O objetivo deste trabalho foi apresentar o balanço de energia na superfície de uma pastagem de Brachiaria brizantha cv. Marandu localizada na região central do cerrado (Planaltina - GO). O estudo foi realizado de 15/11 a 09/12/2001, inicio da esta�
Planaltina. Publicado em: 2011
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10. Analysis of energy fluxes and vegetation-atmosphere parameters in irrigated and natural ecosystems of semi-arid Brazil.
Knowledge on evapotranspiration is essential in quantifying water use depletion and to allocate scarce water resources to competing uses. Despite that an extensive literature describes the theoretical mechanisms of turbulent water vapour transport above and within crop canopies fewer studies have examined land surface parameters within composite landscapes o
Journal of Hydrology. Publicado em: 2011
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11. Evapotranspiração em plantio de milho no cerrado.
RESUMO: O milho (Zea mays L.) é uma cultura de destaque no Cerrado e a disponibilidade de água é considerada um fator ambiental determinante na produtividade dessa cultura. Este trabalho teve como objetivo fornecer as taxas de evapotranspiração, relacionando-as com fatores ambientais em dias sem precipitação durante a estação chuvosa, de um plantio
Planaltina. Publicado em: 2011
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12. Balanco de radiacao e energia da cultura de alface em estufa de polietileno.
Objetivou-se, neste trabalho, determinar os balancos de radiacao e energia da cultura de alface (Lactuca sativa, L. cv. Veronica) em estufa de polietileno. O experimento foi realizado em uma estufa tipo tunel alto com cobertura de polietileno (100 um de espessura) e em uma area externa, ambas com 35 m2. Durante o ciclo da cultura, foram monitoradas as radiac
Pesquisa Agropecuaria Brasileira. Publicado em: 2011