Please use this identifier to cite or link to this item: http://hdl.handle.net/11422/8441
Type: Artigo
Title: Transient conjugated heat transfer in microchannels: Integral transforms with single domain formulation
Author(s)/Inventor(s): Knupp, Diego Campos
Cotta, Renato Machado
Naveira-Cotta, Carolina Palma
Kakaç, Sadik
Abstract: Indisponível.
Abstract: The transient behaviour of conjugated heat transfer in laminar microchannel flow is investigated, taking into account the axial diffusion effects, which are often of relevance in microchannels, and including pre-heating or pre-cooling of the region upstream of the heat exchange section. The solution methodology is based on the Generalized Integral Transform Technique (GITT), as applied to a single domain formulation proposed for modelling the heat transfer phenomena at both the fluid stream and the channel wall regions. By making use of coefficients represented as space dependent functions with abrupt transitions occurring at the fluid–wall interfaces, the mathematical model carries the information concerning the transition of the two domains, unifying the model into a single domain formulation with variable coefficients. The proposed approach is illustrated for microchannels with polymeric walls of different thicknesses. The accuracy of approximate internal wall temperature estimates deduced from measurements of the external wall temperatures, accounting only for the thermal resistance across the wall thickness, is also analyzed.
Keywords: Transient convection
Conjugated problem
Microchannel Integral transforms
Micro-heat exchanger
Generalized Integral Transform Technique
Subject CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
Department : Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Elsevier
In: International Journal of Thermal Sciences
Volume: 88
Issue Date: 10-Jun-2014
DOI: 10.1016/j.ijthermalsci.2014.04.017
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 1290-0729
Appears in Collections:Engenharias

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