Forced Convection
Mostrando 13-24 de 47 artigos, teses e dissertações.
-
13. CFD analysis of tube-fin 'no-frost' evaporators
The purpose of this paper is to assess some aspects of the design of evaporators for household refrigeration appliances using Computational Fluid Dynamics (CFD). The evaporators under study are tube-fin 'no-frost' heat exchangers with forced convection on the air-side and a staggered tube configuration. The calculation methodology was verified against experi
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
-
14. Forced convection to laminar flow of liquid egg yolk in circular and annular ducts
The steady-state heat transfer in laminar flow of liquid egg yolk - an important pseudoplastic fluid food - in circular and concentric annular ducts was experimentally investigated. The average convection heat transfer coefficients, determined by measuring temperatures before and after heating sections with constant temperatures at the tube wall, were used t
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
-
15. A review on nanofluids - part II: experiments and applications
Research in convective heat transfer using suspensions of nanometer-sized solid particles in base liquids started only over the past decade. Recent investigations on nanofluids, as such suspensions are often called, indicate that the suspended nanoparticles markedly change the transport properties and heat transfer characteristics of the suspension. This sec
Brazilian Journal of Chemical Engineering. Publicado em: 2008-12
-
16. 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
-
17. Numerical solution of staggered circular tubes in two-dimensional laminar forced convection
This paper aims to demonstrate the importance of adequately estimating the discretization error intrinsic in the result of any numerical simulation. The problem under consideration is forced convection in a staggered circular tube heat exchanger. The problem is solved to analyze the effect of the distance between the tubes, aiming to optimize the heat exchan
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
-
18. SIMULAÇÃO DA ETAPA DE RESFRIAMENTO DA POLIAMIDA NO PROCESSO DE MOLDAGEM ROTACIONAL / COOLING STAGE SIMULATION OF POLYAMIDE IN ROTATIONAL MOLDING PROCESS
In rotomolding, cooling stage is of fundamental importance to optimize the process in terms of productivity and quality of rotomolded parts. Therefore, the present work has concentrated in the study of this process stage through computational simulation via the multi-purpose commercial software ANSYSTM . It uses finite element method being widely used in eng
Publicado em: 2007
-
19. 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
-
20. Analysis of thermal non-equilibrium for turbulent transport in porous media.
The literature has documented proposals for macroscopic energy equation modeling for porous media considering the local thermal equilibrium hypothesis and laminar flow. In addition, a two-energy equation model has been proposed for conduction and laminar convection in packed beds. With the aim of contributing to new developments, this work treats turbulent h
Publicado em: 2006
-
21. A K − W turbulence model for near-wall thermal flows / Um modelo k − w para escoamentos turbulentos parietais dilatáveis
The main goal of this work is to extend the K − W turbulence model proposed by Bredberg (2002), originally developed in order to simulate turbulent isothermal flows in which adverse pressure gradients occur, to simulate the effects of density variations exclusively due to the presence of thermal gradients - cases vastly applied in industry - implementi
Publicado em: 2006
-
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
-
23. Modelo computacional bidimensional para escoamentos gasosos com transferência de calor em um reator tipo CVD / Computational model 2D for gaseous flow with heat transfer for a reactor type CVD
In this work was made the elaboration of an prototype for the computational numerical simulation of the gaseous ow, with transfer heat, applied to the reactor type CVD, existing in the Laboratorio Associado de Sensores e Materiais (LAS) of the Instituto Nacional de Pesquisas Espaciais (INPE). Initially, we intention was to dene which the best type of mesh to
Publicado em: 2005
-
24. Mixed convective and radiative heat transfer in an inclined rotating rectangular duct with a centered circular tube
A numerical study of steady state laminar forced and free convective and radiative heat transfer in an inclined rotating rectangular duct with a centered circular tube is reported for an hydrodynamically fully developed flow. The two heat transfer mechanisms of convection and radiation are treated independently and simultaneously. The coupled equations of mo
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-09