Heat Transfer in Fibrous Materials

Bankvall, Claes

doi:10.1520/jte10010j

Cited by 114 publications

(7 citation statements)

References 11 publications

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“…They are broadly classified as steady-state methods and transient methods. Due to important density (more than 75 kg•m −3 ), total heat transfer in glass wool is principally due to transfer in gas (Figure 4) [6]. Transfer by radiation and conduction in solids can be considered as negligible.…”

Section: Methodsmentioning

confidence: 99%

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Anisotropic Structure of Glass Wool Determined by Air Permeability and Thermal Conductivity Measurements

Marmoret¹,

Humaish²,

Perwuelz³

et al. 2016

JSEMAT

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We want to conclude on the interest of the "crimping" process used to produce the glass wool and to make a comparison for anisotropic factor obtained from structural property (air permeability) as well as thermal property (thermal conductivity and diffusivity). The main structural (densities, porosity, specific surface, air permeability) and the thermal (conductivity, diffusivity, heat capacity) characteristics of this glass wool are presented. Thermal results are determined by using several methods (Hot disc (HD), Heat Flow Meter (HFM) and Guarded Hot Plate).

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Section: Methodsmentioning

confidence: 99%

“…For the case of randomly oriented pores, the overall thermal conductivity strongly depends on the internal heat transfer across the pore surfaces [5]. The apparent conductivity is principally due to the heat transfer through the gas [6].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Structure of Glass Wool Determined by Air Permeability and Thermal Conductivity Measurements

Marmoret¹,

Humaish²,

Perwuelz³

et al. 2016

JSEMAT

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“…Bankvall [15] conducted a study delineating the influence of various heat transfer mechanisms on the effective thermal conductivity of insulation materials. For low-density materials, characterized by high porosities exceeding 97%, radiation played a significant role, but its contribution diminished as material density increased.…”

Section: Effective Thermal Conductivitymentioning

confidence: 99%

Experimental and Numerical Analysis of Thermal Resistance and Thermal Conductivity in Silica Fibrous Insulation Material at High Temperatures

Mirsharipov

2024

Preprint

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This study presents an in-depth experimental and numerical analysis of thermal resistance and effective thermal conductivity in silica dioxide fibrous insulation materials under high-temperature conditions. The primary objective was to accurately measure thermal properties to ensure the safety and integrity of structures subjected to extreme temperatures, such as rocket exteriors. A steady-state experimental approach was employed to determine the thermal behavior of the silica fibrous sample. Subsequently, a comprehensive 3D model was developed to simulate these conditions, allowing for a detailed comparison between experimental findings and numerical predictions. The results demonstrated a significant correlation between the experimentally obtained data and the simulations, highlighting the reliability of the numerical model in predicting the thermal behavior of silica fibrous insulation materials. The conclusion drawn from this research underscores the critical importance of precise assessment of thermal conductivity and thermal resistance in high-temperature insulation materials. Accurate evaluations are essential for the design and safety of rocket structures, as they significantly influence the thermal protection system's effectiveness. This study not only contributes to the understanding of silica fibrous materials' thermal properties but also provides a validated methodological framework for future research in the thermal analysis of insulation materials.

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“…The structure of fibrous materials is complex, and they are commonly thought of as simplified semi-transparent media consisting of elongated, slender fibers, typically a few micrometers in diameter, interspersed with air or other gases that fill the interstitial space between the fibers. To facilitate the study of the thermal conductivity of fiber insulation materials, several basic theoretical thermal conductivity models due to solid and gas conductions for fibrous media have been developed, such as the Parallel model [43,[47][48][49][50][51][52], Series model [47,[53][54][55], Singh model [56,57], Bankvall model [54,[58][59][60], Maxwell-Eucken model [55], Effective medium theory (EMT) model [51,61,62], Hamilton model [53,61,63], and Bhattacharyya model [43,64,65].…”

Section: Thermal Conductivity Modeling Of Ceramic Fibrous Materialsmentioning

confidence: 99%

Advancements in Thermal Insulation through Ceramic Micro-Nanofiber Materials

Wang,

Fu,

et al. 2024

Molecules

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Ceramic fibers have the advantages of high temperature resistance, light weight, favorable chemical stability and superior mechanical vibration resistance, which make them widely used in aerospace, energy, metallurgy, construction, personal protection and other thermal protection fields. Further refinement of the diameter of conventional ceramic fibers to microns or nanometers could further improve their thermal insulation performance and realize the transition from brittleness to flexibility. Processing traditional two-dimensional (2D) ceramic fiber membranes into three-dimensional (3D) ceramic fiber aerogels could further increase porosity, reduce bulk density, and reduce solid heat conduction, thereby improving thermal insulation performance and expanding application areas. Here, a comprehensive review of the newly emerging 2D ceramic micro-nanofiber membranes and 3D ceramic micro-nanofiber aerogels is demonstrated, starting from the presentation of the thermal insulation mechanism of ceramic fibers, followed by the summary of 2D ceramic micro-nanofiber membranes according to different types, and then the generalization of the construction strategies for 3D ceramic micro-nanofiber aerogels. Finally, the current challenges, possible solutions, and future prospects of ceramic micro-nanofiber materials are comprehensively discussed. We anticipate that this review could provide some valuable insights for the future development of ceramic micro-nanofiber materials for high temperature thermal insulation.

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Heat Transfer in Fibrous Materials

Cited by 114 publications

References 11 publications

Anisotropic Structure of Glass Wool Determined by Air Permeability and Thermal Conductivity Measurements

Anisotropic Structure of Glass Wool Determined by Air Permeability and Thermal Conductivity Measurements

Experimental and Numerical Analysis of Thermal Resistance and Thermal Conductivity in Silica Fibrous Insulation Material at High Temperatures

Advancements in Thermal Insulation through Ceramic Micro-Nanofiber Materials

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