Transient combined radiation and conduction heat transfer in fibrous media with temperature and flux boundary conditions

Asllanaj, Fatmir; Jeandel, G.; Roche, Jean Rodolphe; Lacroix, David

doi:10.1016/j.ijthermalsci.2004.02.007

Cited by 32 publications

(18 citation statements)

References 24 publications

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“…Previous studies 8,17 about heat transfer in fibrous material have shown that radiative heat transfer might constitute a non-negligible part of the total heat. The radiative source term S r included in the eq.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Fibrous materials are commonly used as thermal insulation in many engineering systems due to their effect in reducing the radiation heat transfer. [8][9][10] NW is a porous medium; it means it is a material consisting of solid matrix (the fibers) with an interconnected void. The interconnectedness of the void (the pores) allows the flow of one or more fluids through the material.…”

Section: Introductionmentioning

confidence: 99%

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Nonwoven as heat barrier: Modeling of the efficiency of Carbtex fibers

Bourbigot

Duquesne

Vannier

et al. 2008

J of Applied Polymer Sci

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In this work, we examine the use of nonwoven (NW) as heat barrier to protect a metallic substrate. Carbtex fibers consisting in a thermoplastic core inside an oxidized outer shell (polyacrylonitrile or PAN fibers) are selected to make the NW. Measuring temperature profiles in a heat radiator test; it is revealed that Carbtex NW is an efficient heat barrier. A macroscopic model is then developed to simulate heat transfer in NW (considered as a porous medium) used as a protective heat barrier on aluminum plate. The model is validated comparing experimental results obtained by the heat radiator test and predicted values. The efficiency of NW layer is simulated varying different parameters characteristic of the NW (porosity and heat conductivity) and of the design (thickness of the layer). It is revealed to get good efficiency of the NW heat barrier that heat conductivity of the fibers is crucial to get superior performance as well as high porosity (higher than 0.5) associated with a reasonable thickness of NW (5-7 mm).

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Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonwoven as heat barrier: Modeling of the efficiency of Carbtex fibers

Bourbigot

Duquesne

Vannier

et al. 2008

J of Applied Polymer Sci

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“…F. Asllanaj et al [10] used the Kirchhoff transformation associated with a P2 finite elements method to solve the non-transient Heat Conduction Equation and a direct method to solve the Radiative Transfer Equation, their numerical method is applied to any kind of fibrous media. In the absence of natural convective heat transfer, the conservation of energy for one-dimensional heat transfer through the insulation by conduction and radiation yields the partial differential equation:…”

Section: -P2 Nd European Energy Conferencementioning

confidence: 99%

Determination of physical properties of fibrous thermal insulation

Tilioua¹,

Libessart²,

Joulin

et al. 2012

EPJ Web of Conferences

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Abstract. The objective of this study is to characterize both experimentally and theoretically, conductive and radiative heat transfer within polyester batting. This material is derived from recycled bottles (PET) with fibres of constant diameters. Two other mineral and plant fibrous insulation materials, (glass wool and hemp wool) are also characterized for comparative purposes. To determine the overall thermophysical properties of the tested materials, heat flux measurement are carried out using a device developed in house. The radiative properties of the material are determined by an inverse method based on measurements of transmittance and reflectance using a FTIR spectrometer and by solving the equation of radiative heat transfer. These measures are compared to results of numerical simulations.

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“…The numerical method we used is described in detail in Asllanaj et al [15] for temperature boundary conditions and is only briefly summarized here. Heat transfer is solved by coupling conduction and radiation.…”

Section: Resolution Of the Heat Transfer In Transient Statementioning

confidence: 99%