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Showing 1 to 20 of 265 for “"Calor"”.
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Análise experimental e CFD da transferência de calor utilizando nanofluidos com nanopartículas de Grafeno GNP/Água em trocadores de calor
Os trocadores de calor desempenham um papel primordial na aplicação industrial, especialmente nas áreas de ciência térmicas, energia e engenharia química, em muitos processos como na indústria de refino de petróleo, geração de energia elétrica, proteção ambiental e em até tratamentos de efluentes, …
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Projeto térmico de trocadores de calor resfriados a ar
The scarcity and the treatment costs of the water cooling, in the petroleum and petrochemical industries, are increasing the use of the air cooled heat exchangers. Exchangers designing usualy utilize the estimate and global methods. This paper shows these methods and presents a new approach for …
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Tubo de calor de água, um estudo teórico-experimental
The aim of this work was to develop methodologies for the project, manufacturing and experimental thermal evaluation of heat pipes. The model suggested by SUN and TIEN for theoretical steady-state heat pipe performance was solved for a new condition of cooling fluid and used for predicting the wall …
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Análise teórico experimental dos evaporadores de uma bomba de calor
Faz-se um estudo da construção de uma bomba de calor residencial de baixo custo utilizando um condicionador de ar do tipo janela. Com tal equipamento operando fora das condições de projeto é preciso fazer uma avaliação das novas condições de operação, onde os evaporadores passam a ser objetivo de …
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Desarrollo de componentes de porosidad funcionalizada para conductos de calor.
El objetivo del trabajo es la obtención de mechas para su uso en LHP’s con porosidades funcionalizadas y diámetro de poro controlado. Hay infinidad de usos descritos para materiales metálicos con porosidad controlada y abierta, así como de poros de pequeño diámetro, tamaño uniforme y posiblemente …
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Ebulição nucleada em placa plana com geração transiente de calor
ln a flat platinum ribbon immersed in saturated pool water at atmospheric pressure, power is uniformly generated at a linearly increasin'g rate with durations of 191, 25ms and 200ms. The variation with time of the ribbon temperature, power generated and energy release rate transfered to the liquid, …
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Transferência de calor em sistemas bifásicos durante a fusão térmica
In this work a transient model of a free boundary value problem is analysed in arder to represent the temperature profile in liquid and solid phases during thermal fusion. The experimental results which were obtained in a special probe are compared with the results of the conductive unidirectional …
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Transferência de calor em leito fluidizado com tubos horizontais imersos
In a bed of coal ash particles fluidized by air with ar without horizontal immersed tubes, the influence of such tubes on the expansion of the bed is examined and comparison is made between experirnent and the two-phase theory of fluidization. The expanison of the bed was determined experimentally …
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Ebulição nucleada em placa plana horizontal com baixos fluxos de calor
ln a horizontal copper disk inmersed in water at saturation temperature heat is transfered in steady state. Levels of heat flux are regulated so that free convection and then nucleate boiling are observed. The value of heat flux is determined experimentally and high speed film is used to register …
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Simulação numérica de um sistema de armazenamento de calor em estufas de plasticultura
… para simular um sistema de armazenamento de calor no solo em estufas para plasticultura é o objetivo do presente trabalho. O sistema consiste num feixe de tubos enterrados no solo. A convecção forçada de ar no seu interior realiza a troca térmica necessária para manter as estufas sob faixas …
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Transferência de calor no escoamento bifásico de dois componentes, regime anular, tubo vertical
An analytic model for determination of the heat transfer coeficient during the two phase upflow (water + air) in vertical tubes was developped. The design and construction of the equipment is then discussed. The experiments were carried out in one tube, 6mm int and 1500mm of length, which suffered …
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Análise teórico-experimental de microrreatores para síntese de biodiesel com recuperação de calor rejeitado
The present work deals with the analysis of the continuous synthesis of biodiesel in microreactors using the rejected heat of a thermal source and has as objective to obtain the maximum efficiency of the biodiesel production using multiple microreactors, aiming at the scheduling of the production, …
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Influência da dissipação viscosa na transferência de calor em tubos concêntricos no escoamento turbulento
The temperature profile for a turbulent flow, of a newtonian fluid flowing between two concentric tubes has been determined. The velocity profile was based on the Deissler and Quarmby equations for turbulent flows. The momentum difusivity equation for the turbulent flow has been evaluated according …
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Influencia de tratamientos combinados de calor y antimicrobianos naturales en la viabilidad de distintos microorganismos
[SPA] Los tratamientos térmicos se aplican profusamente en la industria alimentaria ya que permiten destruir a los microorganismos y a sus enzimas de forma controlada, garantizando, hasta ciertos niveles, la salubridad y estabilidad de los alimentos. Sin embargo, dichos tratamientos también afectan …
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Análise de problemas não lineares de transferência de calor pelo método dos elementos de contorno
The present work discusses the numerical solution of non-linear heat conduction problems by the boundary element method (B.E.M.); non linearities here considered refer to the temperature dependence of the conductivity and to the non-linear boundary and interface conditions. The B.E.M. is employed …
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Estudo comparativo de algoritmos de integração direta, aplicados a problemas de condução de calor transiente
A comparative study of direct integration algorithms was developed in this work for linear two-dimensional transient heat conduction problems. The system of diferential equations of the problem was integrated, in space, by the use of the Finite Element Discretization Technique, using the curved …
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