Convective Coefficient
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. Obtenção de correlações para a estimativa do coeficiente convectivo de transferência de massa para geometria esférica a partir da técnica de sublimação do naftaleno
Vários processos industriais envolvem o conhecimento das taxas de transferência de calor e massa para fluidos passando por corpos sólidos. Essas taxas de transferência são funções de parâmetros chamados de coeficiente convectivo de transferência de calor (h), para as situações que envolvem o transporte de energia, e de coeficiente convectivo de tr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/07/2010
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14. Rainfall short-term forecast in the surveillance area of São Paulo weather radar. / Previsão de chuva a curtíssimo prazo na área de abrangência do radar meteorológico de São Paulo
The evaluation of the rainfall short-term forecast up to 3 hours in advance within the surveillance area of São Paulo weather radar (RSP) for different types of precipitating systems, mainly the are associated to floods and landslides in Metropolitan Area of São Paulo (RMSP), was carried out with an 2D wind advective scheme and rainfall rates estimated wit
Publicado em: 2009
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15. Desidratação osmotica e secagem convectiva de maçã : transferencia de massa e alterações de estrutura celular / Osmotic dehydrations and convective drying apple; : mass transfer and cellular structure changes
In this study it was investigated the osmotic dehydration of apples (Fuji variety) followed or not by convective drying with hot air. Concentration profiles were determined for water and solute(s) in samples of apples cut in half and osmotically dehydrated in binary aqueous solutions (30% and 50% sucrose, w/w) and ternary solution (50% sucrose and 10% sodium
Publicado em: 2009
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16. Convective cooling of three discrete heat sources in channel flow
A numerical investigation was performed to evaluate distinct convective heat transfer coefficients for three discrete strip heat sources flush mounted to a wall of a parallel plates channel. Uniform heat flux was considered along each heat source, but the remaining channel surfaces were assumed adiabatic. A laminar airflow with constant properties was forced
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-09
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17. Mass transfer inside oblate spheroidal solids: modelling and simulation
A numerical solution of the unsteady diffusion equation describing mass transfer inside oblate spheroids, considering a constant diffusion coefficient and the convective boundary condition, is presented. The diffusion equation written in the oblate spheroidal coordinate system was used for a two-dimensional case. The finite-volume method was employed to disc
Brazilian Journal of Chemical Engineering. Publicado em: 2008-03
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18. Sistema de secagem solar para frutos tropicais e modelagem da secagem de banana em um secador de coluna estática / Solar drying system for tropical fruits and a model for drying bananas in a static column dryer
In this study were projected, built and tested an electric solar dryer consisting of a solar collector, a drying chamber, an exhaust fan and a fan to promote forced hot air convection. Banana drying experiments were also carried out in a static column dryer to model the drying and to obtain parameters that can be used as a first approximation in the modeling
Publicado em: 2008
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19. Mixed convection heat transfer in rotating vertical elliptic ducts
This paper presents an investigation into the solution of laminar mixed convective heat transfer in vertical elliptic ducts containing an upward flowing fluid rotating about a parallel axis. The coupled system of normalized conservation equations are solved using a power series expansion in ascending powers of rotational Rayleigh Number, Ratau - a measure of
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-06
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20. Avaliação do processo de congelamento em tunel portatil com convecção forçada por exaustão e insuflação. / Freezing process evaluation using a portable forced air tunnel with air evacuation and air blowing in pallets.
The conditions necessary to keep the air temperature and movement at the product surface will determine the freezing process efficiency. Since the energy level could implement on the final cost, the reduction of the freezing process time was a major goal in the whole experiment. Food products are predominantly frozen in air blast freezing tunnels. Therefore,
Publicado em: 2007
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21. Two-phase non-equilibrium models: the challenge of improving phase change heat transfer prediction
This lecture addresses some recent developments in modelling of macroscopic thermodynamic and hydrodynamic non-equilibrium phenomena in convective phase change (boiling and condensation) of pure fluids and mixtures. Proper accounting of such phenomena may hold the key to explain and predict deviations from the classical (equilibrium) phase change convective
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-03
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22. Transient convective heat transfer
In nature, as well as within the human-made thermal systems, the time-variable regimes are more commonly encountered, if not always, than the permanent regimes. Nevertheless, studies in convection are still more frequent in the permanent regimes, undoubtedly due to the related difficulties in calculation in terms of time and cost of computation. One may dist
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-03
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23. CONVECÇÃO FORÇADA EM ESCOAMENTOS LAMINARES DE LÍQUIDOS VISCOPLÁSTICOS EM TUBOS E ESPAÇOS ANULARES / FORCED CONVECTION IN LAMINAR FLOWS OF VISCOPLASTIC LIQUIDS THROUGH TUBES AND ANNULI
Non-Newtonian fluids flow are very common in industrial processes, so it is important to know both the effect of the process on the fluid and vice-versa. Non-Newtonian Fluids exhibit complex mechanical behavior not found in Newtonian fluids, such as shear-rate-dependent viscosity and non-zero Yield stress. Nowadays there is a lack of understanding in the lit
Publicado em: 2004
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24. Estudo de tochas de plasma atraves da teoria da similaridade
In this thesis, generalized equations for the voltage-current characteristics have been obtained for a non transferred arc plasma torch and for a transferred arc plasma torch, using the method of the Theory of the Similarity. For the non transferred arc plasma torch, the experimental data was obtained for air as the plasmagenic gas and for currents of 10 to
Publicado em: 2003