Thermal response of integral, multicomponent composite thermal protection systems

Stewart, David A.; Leiser, Daniel B.; Smith, Marnell; Kolodziej, Paul

doi:10.2514/3.25823

Cited by 17 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As mentioned previously, heat transfer through fibrous material consists of conduction, natural convection and radiation. Previous studies have shown that radiation accounts for 40-50% of the total heat transfer through fibrous materials [12,13]. Under steady-state conditions, Fourier's heat conduction equation can be used for calculation of effective thermal conductivity by equation (1) [14,15]: where k eff is the effective thermal conductivity (Wm À1 K À1 ) of the fabric, q is the heat flow rate per unit area (Wm À2 ), A is the area normal to the heat flow (m À2 ), ÁT is the temperature gradient (K) across the fabric thickness and L is the fabric thickness (m).…”

Section: Series Model For Thermal Resistancementioning

confidence: 99%

Thermal insulation property of spacer fabrics integrated by ceramic powder impregnated fabrics

Ziaei

Ghane

2012

Journal of Industrial Textiles

View full text Add to dashboard Cite

Nowadays, because of limited sources of energy, thermal insulation property is becoming very important for engineers. The main purpose of this work is to investigate thermal insulation property of three-dimensional knitted spacer fabrics integrated by ceramic powder-impregnated fabrics. Ceramic materials are well-known and useful for thermal insulation applications. An apparatus was designed and manufactured for measuring the heat flux through fabrics as well as thermal insulation property. The apparatus consists of a guarded hot plate providing adjustable temperature ranging from 36 to 500 C. In order to measure the fabric cold-side temperature, an infrared thermometer is used. A heat flux sensor is also used to measure the heat flux through samples. To improve thermal property and prevent the air convection through spacer fabric, a three-layered fabric system consisting of a three-dimensional knitted polyester spacer fabric in the middle and integrated by two layers of knitted cotton fabrics impregnated with silica at both sides was constructed. This multilayer construction had a significant effect on increasing the thermal resistance property in comparison to the untreated spacer fabric. A series model was also considered for the thermal resistance of multilayered set. Thermal resistance of each layer was first measured separately and thermal resistance of multilayered set was calculated according to the series model. The total thermal resistance of the set was then measured. The results showed a good agreement with those from series model.

show abstract

Section: Series Model For Thermal Resistancementioning

confidence: 99%

Thermal insulation property of spacer fabrics integrated by ceramic powder impregnated fabrics

Ziaei

Ghane

2012

Journal of Industrial Textiles

View full text Add to dashboard Cite

show abstract

“…The dominant mechanisms of heat flow are conduction by the air and radiation. Previous studies about heat transfer through fibrous media have shown that radiative heat transfer accounts for 40 % to 50 % of the total heat transfer in light-weight fibrous insulation at moderate temperatures [2]. The energy transport process in fibrous insulation under aerodynamic heating conditions is complicated with increasing temperature, which makes the analysis and design of insulation quite difficult.…”

Section: Introductionmentioning

confidence: 99%

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

Zhao

Zhang

et al. 2009

Int J Thermophys

View full text Add to dashboard Cite

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.

show abstract

“…The wall boundary condition for the LTV and Mars aerobrake cases is Stewart's nite wall catalysis model 18 . The capsule return cases employ the super-catalytic" boundary condition in which freestream species concentrations are enforced at the wall.…”

Section: Physical Models In Lauramentioning

confidence: 99%

Coupled radiation effects in thermochemical nonequilibrium shock-capturing flowfield calculations

Hartung

Mitcheltree

Gnoffo

1992

27th Thermophysics Conference

View full text Add to dashboard Cite

Lunar and Mars return conditions are examined using the LAURA ow eld code and the LORAN radiation code to assess the e ect of radiative coupling on axisymmetric thermochemical nonequilibrium ows. Coupling of the two codes is achieved iteratively. Special treatment required to couple radiation in a shock-capturing method is discussed. Results indicate that while coupling e ects are generally the same as occur in equilibrium ows, under certain conditions radiation can modify the chemical kinetics of a nonequilibrium ow and thus alter relaxation processes. Coupling e ects are found to be small for all cases considered, except for a ve meter diameter aerobrake returning from Mars at 13.6 km sec.

show abstract

Thermal response of integral, multicomponent composite thermal protection systems

Cited by 17 publications

References 3 publications

Thermal insulation property of spacer fabrics integrated by ceramic powder impregnated fabrics

Thermal insulation property of spacer fabrics integrated by ceramic powder impregnated fabrics

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

Coupled radiation effects in thermochemical nonequilibrium shock-capturing flowfield calculations

Contact Info

Product

Resources

About