Heat transfer simulation through textile porous media

Codau, Elena; Codau, Teodor-Cezar; Lupu, Iuliana-Gabriela; Raru, Aliona; Farima, Daniela

doi:10.1080/00405000.2022.2027608

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…Under vacuum conditions for dry preforms, the primary heat transfer mode is conduction between woven carbon fiber tows, with minor contributions from gap radiation through pores [19]. Since the system operates under full vacuum, convection is negligible due to air absence.…”

Section: Preprintsmentioning

confidence: 99%

Thermophysical Characterization of Materials for Energy-Efficient Double Diaphragm Preforming

Dandangi,

Ravandi,

Naser

et al. 2024

Preprint

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The Double Diaphragm Forming (DDF) process uses vacuum pressure and heat to pre-shape composite reinforcements between flexible diaphragms. Accurate modelling of heat transfer within DDF requires knowledge of the thermophysical properties of the constituent materials. This study investigates the specific heat and thermal conductivity of silicone diaphragms, carbon fibers (chopped and powdered), thermoplastic veils, and their combinations. Experiments measured the specific heat of each material using differential scanning calorimetry and the thermal conductivity of silicone and carbon fabric preforms using the transient plane source method and modified transient plane source method respectively. The influence of reheating cycles on specific heat of carbon fiber-veil samples and the effect of compaction on thermal conductivity of silicone and carbon fabrics were explored. While silicone exhibited linear specific heat behavior, the thermoplastic veil showed non-linearity due to phase change. The combined carbon fiber-veil samples demonstrated slight non-linear specific heat variations depending on reheating cycles. Thermal conductivity of the fabric preforms decreased with the addition of thermoplastic veil and under vacuum-compaction conditions. The established temperature-dependent property relationships provide valuable data for optimizing DDF preforming parameters and enhancing energy efficiency in composite manufacturing.

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Section: Preprintsmentioning

confidence: 99%

Thermophysical Characterization of Materials for Energy-Efficient Double Diaphragm Preforming

Dandangi,

Ravandi,

Naser

et al. 2024

Preprint

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“…For the past few years, there has been considerable interest in numerical simulations using commercial software as it can efficiently handle complex geometries and material properties, supporting cost-effective and time-efficient simulations. This method enables accurate characterization, optimization, and understanding of industrial processes involving radiative heat transfer in porous media, [30], [31]. The current paper suggests employing COMSOL Multiphysics, a commercial Finite Element Method (FEM) software, to examine the radiative characteristics of four regular configurations of cylindrical packed bed porous media.…”

Section: Introductionmentioning

confidence: 99%

Identification of the Effective Radiative Properties of Cylindrical Packed Bed Porous Media

Bouraoui,

Nejma

2024

1790-5044

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Understanding radiative exchange in a porous medium is a crucial step that can provide significant insights and improvements in its characteristics, enhancing its practical utility across various industrial applications. In this paper, a numerical model, utilizing the finite element method (FEM), was developed to predict the radiative transfer between a diffusely/specularly reflecting cylindrical packed bed porous medium and a plane heating surface. Four different structures of the medium were suggested to examine the effect of the particles ‘disposition on the radiative properties of the medium. The assessment of normalized flux distribution enables the computation of effective radiative properties including reflectivity, transmissivity, and absorptivity for particles exhibiting diffuse and specular reflection. The results underscore the significant influence of particle arrangement on media properties. The structure of the second model allowed for the attainment of an opaque surface from the first layer. Meaningful correlations can be established from the presented curves, offering a streamlined and accurate method for determining effective radiative property coefficients based on emissivity in future model applications.

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“…The heat transfer simulations were designed to determine the average temperature of the top surface [27]. Codau et al [28] investigated heat transfer textile porous media at a microand macro-scale. In proposed models, the heat transfer due to convection and radiation was neglected.…”

Section: Introductionmentioning

confidence: 99%

Application of Combined Micro- and Macro-Scale Models to Investigate Heat and Mass Transfer through Textile Structures with Additional Ventilation

2023

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In this study, computational models of heat and mass exchange through textile structures with additional ventilation at the micro- and macro-scale were investigated. The finite element analysis of advanced textile materials provides a better understanding of their heat and mass transfer properties, which influence thermal comfort. The developed computational models can predict air permeability (AP), thermal resistance (Rct), and heat transfer (h) coefficients at the micro-scale. Moreover, the mesh size was taken into consideration and validated with experimental data presented in the literature. In addition, computational models were extended to micro- and macro-scale forced ventilation models. Macro-scale finite element models require input parameters such as an effective heat transfer coefficient that are usually obtained experimentally. In this research, the heat transfer coefficients (hmicrolayer = 25.603 W/(K·m2), htotal = 8.9646 W/(K·m2)) were obtained numerically from the micro-scale model and were applied to a macro-scale model. The proposed methodology and developed models facilitate the determination of average temperature and temperature distributions through different through-thickness positions along the axis Oz. The simulations were carried out using Comsol Multiphysics and Matlab software.

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Heat transfer simulation through textile porous media

Cited by 10 publications

References 9 publications

Thermophysical Characterization of Materials for Energy-Efficient Double Diaphragm Preforming

Thermophysical Characterization of Materials for Energy-Efficient Double Diaphragm Preforming

Identification of the Effective Radiative Properties of Cylindrical Packed Bed Porous Media

Application of Combined Micro- and Macro-Scale Models to Investigate Heat and Mass Transfer through Textile Structures with Additional Ventilation

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