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Modelling glass wool in COMSOL
Posted Dec 11, 2014, 4:32 a.m. EST Geometry, Materials, Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.3 1 Reply
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Hi
I want to model heat transfer between a glass plate and aluminum sheet that are separated by a layer of glass wool sandwiched between the two. I am not sure what would be the correct way to model a layer of glass wool. Microscopically glass wool is a fluffy porus material made of zillions of fibers drawn from glass. Average fiber diameter is 10 micon and average fiber length is about 2 cm. Creating geometry & meshing of glass wool in COMSOL is practically a formidable task. Is there ant easier way to model such material in comsol? Finally I am interested to know how good thermal insulation the glass wool provide. So how does one go about modelling such a material in COMSOL?
I want to model heat transfer between a glass plate and aluminum sheet that are separated by a layer of glass wool sandwiched between the two. I am not sure what would be the correct way to model a layer of glass wool. Microscopically glass wool is a fluffy porus material made of zillions of fibers drawn from glass. Average fiber diameter is 10 micon and average fiber length is about 2 cm. Creating geometry & meshing of glass wool in COMSOL is practically a formidable task. Is there ant easier way to model such material in comsol? Finally I am interested to know how good thermal insulation the glass wool provide. So how does one go about modelling such a material in COMSOL?
1 Reply Last Post Dec 12, 2014, 5:30 a.m. EST
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Posted:
1 decade ago
Hi
my understanding of the isolation effect of glass wool, or any other "wool" type structure is that the fibres are cutting off the fluid convection, so you end up with basically conduction only in air + fibres, but not really over a uniform contact areas of fibres neither.
So either you get the heat conduction of your material from the supplier,
or you try to model it by the thermal conduction (only) of air or a ratio air fibre taking a homogeneous density, heat capacity and heat conduction from the two materials
à la: rho_total=eta*rho_1+(1-eta)*rho_2 where eta is you material ratio
--
Good luck
Ivar
my understanding of the isolation effect of glass wool, or any other "wool" type structure is that the fibres are cutting off the fluid convection, so you end up with basically conduction only in air + fibres, but not really over a uniform contact areas of fibres neither.
So either you get the heat conduction of your material from the supplier,
or you try to model it by the thermal conduction (only) of air or a ratio air fibre taking a homogeneous density, heat capacity and heat conduction from the two materials
à la: rho_total=eta*rho_1+(1-eta)*rho_2 where eta is you material ratio
--
Good luck
Ivar