Internal radiation transport and effective thermal conductivity of fibrous ceramic insulations

Marschall, Jochen; Maddren, Jesse; Parks, Jason

doi:10.2514/6.2001-2822

Cited by 25 publications

(8 citation statements)

References 13 publications

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“…This method has been used by Daryabeigi [14] and Marschall [15] to calculate the radiation heat transfer within fibrous insulation under aerodynamic heating conditions. The radiant heat flux in fibrous insulation is related to incident radiation, G, according to:…”

Section: Thermal Response Model Descriptionmentioning

confidence: 99%

Probabilistic modeling of transient heat transfer and assessment of thermal reliability of fibrous insulation under aerodynamic heating conditions

Zhao

Zhang

2009

International Journal of Thermal Sciences

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Section: Thermal Response Model Descriptionmentioning

confidence: 99%

Probabilistic modeling of transient heat transfer and assessment of thermal reliability of fibrous insulation under aerodynamic heating conditions

Zhao

Zhang

2009

International Journal of Thermal Sciences

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“…al. 10 temperature dependent effective conductivities are not expected to correctly model the thermal transient response of a porous material, especially in high heating rate environments. For the transient analysis we will reproduce the arc-jet heating environment test from Ref.…”

Section: B Transient Analysismentioning

confidence: 99%

“…For the transient analysis we will reproduce the arc-jet heating environment test from Ref. [10]. The model is initially at 300 K. The boundary condition is a time-dependent fixed temperature (Dirichlet) on one side of the sample and an adiabatic condition (Neumann) on the other side (see Fig.…”

Section: B Transient Analysismentioning

confidence: 99%

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Radiation Heat-Transfer Model for the Ablation Zone of Low-Density Carbon-Resin Composites

Lachaud

2010

10th AIAA/ASME Joint Thermophysics and Heat Transfer Conference

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Direct numerical simulations of radiation heat-transfer have enabled the validation of a semi-analytical model for the effective radiative conductivity of two-dimensional carbonfiber preforms. The effective conductivity is shown to be a function of three parameters: the local temperature, the extinction coefficient, and the sample thickness. The integration of the proposed model in state-of-the-art ablation tools is relatively simple because only the effective conductivity needs to be modified (the formulation of the energy equation is not modified). This fundamental study has been applied to ablation. In the ablation zone of low-density carbon-resin composites, the matrix is removed and the carbon fibers lie unprotected. The effective radiative conductivity is found to be about twice as large when the matrix is removed. Although the ablation zone is very thin, its presence is shown to slightly modify the internal temperature profile.

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“…Tong et al [5][6][7] used the two-flux model assuming linearized anisotropic scattering to model radiation heat transfer through fibrous insulation, and the predicted fluxes that combined radiant and conduction heat transfer were compared with measured data up to 450 K and at one atmosphere. Marschall et al [8] used temperature transients computed with a radiation-conduction model as input to a parameter estimation routine to extract dynamic effective conductivities and compared these to static values. Daryabeigi [9] modeled heat transfer in alumina fibrous insulation to predict effective thermal conductivities.…”

Section: Introductionmentioning

confidence: 99%

Inverse Identification of Thermal Properties of Fibrous Insulation from Transient Temperature Measurements

Zhao

Zhang

et al. 2009

Int J Thermophys

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In this article, an experimental setup was developed to measure the transient temperature response in fibrous insulation. The radiative properties were modified to take anisotropic scattering in fibrous insulation into account. A model of combined radiation and conduction heat transfer through fibrous insulation was generated based on the two-flux approximation. Using the measured transient temperature response, the Levenberg-Marquardt method was utilized to identify the equivalent radiative properties and thermal conductivities of fibrous insulation. The identified thermal properties were validated by transient and steady state experimental results of fibrous insulation. Satisfactory agreement was obtained.

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Internal radiation transport and effective thermal conductivity of fibrous ceramic insulations

Cited by 25 publications

References 13 publications

Probabilistic modeling of transient heat transfer and assessment of thermal reliability of fibrous insulation under aerodynamic heating conditions

Probabilistic modeling of transient heat transfer and assessment of thermal reliability of fibrous insulation under aerodynamic heating conditions

Radiation Heat-Transfer Model for the Ablation Zone of Low-Density Carbon-Resin Composites

Inverse Identification of Thermal Properties of Fibrous Insulation from Transient Temperature Measurements

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