Prediction of the six parameters of an equivalent fluid model for thermocompressed glass wools and melamine foam

Lei, Lan; Lanfranchi, Vincent; Chazot, Jean‐Daniel

doi:10.1016/j.apacoust.2018.04.010

Cited by 24 publications

(15 citation statements)

References 28 publications

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“…We consider, as a first approximation, that the solid phase of vegetal wools is made of successive horizontal and parallel fibre layers due to their manufacturing process. It gives them an anisotropic behavior (Lei et al, 2018). We also consider that fibres have a constant cross-section over their entire length.…”

Section: Basic Hypothesis Concerning the Fibrous Mediummentioning

confidence: 99%

Micro-Macro Modelling Approach of Vegetal Wools Thermal Conductivity

Piégay

Glé

Gourlay

et al. 2022

Construction Technologies and Architecture

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Biosourced materials such as vegetal wools offer major thermal insulation advantages in the green buildings field. Experimental characterisations of vegetal wools thermal conductivity as a function of their density show the existence of an optimum conduction-radiation coupled value. This specific point, as well as the properties of vegetal wools are related to the large variability of shapes and sizes of their fibres. In order to take this specificity into account, it seems particularly relevant to use micro-macro modelling methods to predict the thermal conductivities related to both conduction and radiation heat transfer phenomena. In a first time, a self-consistent method based on a cylindrical geometry (SCMcyl) is used as a modelling approach for conduction transfers. Then, a modelling approach developed by Bankvall and based on an equivalent fibre radius value is used for radiation transfers. So, by coupling these two approaches, it is possible to obtain an equivalent thermal conductivity of fibrous materials as a function of density. Finally, this method is validated by comparison with experimental data.

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Section: Basic Hypothesis Concerning the Fibrous Mediummentioning

confidence: 99%

Micro-Macro Modelling Approach of Vegetal Wools Thermal Conductivity

Piégay

Glé

Gourlay

et al. 2022

Construction Technologies and Architecture

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“…However, the parallel case does not correspond to a conventional use of insulation panels in buildings. Even though all orientations of the wave are possible between these two limits [9,29], in this paper, only a specific focus is done on the perpendicular case which corresponds to most practical applications. To use a micro-macro homogenization method, 125 two basic principles must be respected :…”

Section: Basic Hypothesis Concerning the Fibrous Mediummentioning

confidence: 99%

“…They display a strong variability in fibre size distribution [5,8]. Moreover, the organization of fibres in the materials leads to an anisotropic behaviour [9,10]. These aspects of the fibrous microstructure of vegetal 10 wools have a direct impact on their sound absorption performances at macroscopic scale [5,8,11,12,13] and it is necessary to take them into account when modeling sound absorption coefficient of vegetal wools.…”

Section: Introductionmentioning

confidence: 99%

A self-consistent approach for the acoustical modeling of vegetal wools

Piégay

Glé

Gourlay

et al. 2021

Journal of Sound and Vibration

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Vegetal wools have the capacity to store atmospheric carbon dioxyde, one of the main gases responsible for climate change. So, these insulating materials are used as key elements for green buildings. Moreover, vegetal wools present high sound absorption level performances contributing to the acoustic comfort of indoor living spaces. These properties are directly related to the morphology and the * .

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“…However, it should be mentioned that the linear relationships, developed for 1D compression, have been validated only for a material with high internal porosity within the range φ = 0.944 ÷ 0.995. In fact, it has been shown [42,43] that Castagnède et al's formulas for 1D compression provide reliable results when a small compression rate and highly porous materials are considered, although it may be inaccurate to investigate high density materials. Moreover, this approach does not take into account the variation of the fibres' orientation due to the compression, which has been proven to have a significant influence on the physical properties of the material [43].…”

Section: Materials Characterisation Varying the Compression Ratementioning

confidence: 99%

“…In fact, it has been shown [42,43] that Castagnède et al's formulas for 1D compression provide reliable results when a small compression rate and highly porous materials are considered, although it may be inaccurate to investigate high density materials. Moreover, this approach does not take into account the variation of the fibres' orientation due to the compression, which has been proven to have a significant influence on the physical properties of the material [43]. Nevertheless, Castagnède's model, due to its simplicity and straightforward applicability, represents a good starting point to define an empirical tool to be used in order to characterise hemp fibres, which have never been systematically…”

Section: Materials Characterisation Varying the Compression Ratementioning

confidence: 99%