Please use this identifier to cite or link to this item: http://hdl.handle.net/11422/8447
Type: Artigo
Title: Analysis of conjugated heat transfer in micro-heat exchangers via integral transforms and non-intrusive optical techniques
Author(s)/Inventor(s): Knupp, Diego Campos
Naveira-Cotta, Carolina Palma
Renfer, Adrian
Tiwari, Manish Kumar
Cotta, Renato Machado
Poulikakos, Dimos
Abstract: Indisponível.
Abstract: The purpose of this paper is to employ the Generalized Integral Transform Technique in the analysis of conjugated heat transfer in micro-heat exchangers, by combining this hybrid numerical-analytical approach with a reformulation strategy into a single domain that envelopes all of the physical and geometric sub-regions in the original problem. The solution methodology advanced is carefully validated against experimental results from non-intrusive techniques, namely, infrared thermography measurements of the substrate external surface temperatures, and fluid temperature measurements obtained through micro Laser Induced Fluorescence. The methodology is applied in the hybrid numerical-analytical treatment of a multi-stream micro-heat exchanger application, involving a three-dimensional configuration with triangular cross-section micro-channels. Space variable coefficients and source terms with abrupt transitions among the various sub-regions interfaces are then defined and incorporated into this single domain representation for the governing convection-diffusion equations. The application here considered for analysis is a multi-stream micro-heat exchanger designed for waste heat recovery and built on a PMMA substrate to allow for flow visualization. The methodology here advanced is carefully validated against experimental results from non-intrusive techniques, namely, infrared thermography measurements of the substrate external surface temperatures and fluid temperature measurements obtained through Laser Induced Fluorescence. A very good agreement among the proposed hybrid methodology predictions, a finite elements solution from the COMSOL code, and the experimental findings has been achieved. The proposed methodology has been demonstrated to be quite flexible, robust, and accurate. The hybrid nature of the approach, providing analytical expressions in all but one independent variable, and requiring numerical treatment at most in one single independent variable, makes it particularly well suited for computationally intensive tasks such as in optimization, inverse problem analysis, and simulation under uncertainty.
Keywords: Infrared thermography
Micro-channels
Conjugated problem
Hybrid methods
Integral transforms
Micro-LIF
Micro-heat exchangers
Conjugated heat transfer
Micro-laser induced fluorescence
Subject CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
Production unit: Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Emerald
In: International Journal of Numerical Methods for Heat and Fluid Flow
Volume: 25
Issue: 6
Issue Date: 13-May-2019
DOI: 10.1108/HFF-08-2014-0259
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 0961-5539
Appears in Collections:Engenharias

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