MATLAB: Internal heat source PDE

internal heat sourcePartial Differential Equation Toolboxpdethermal model

Dear community,

I am using the PDE toolbox to study the release of latent heat from a solid geometry. To do so, I need to set the internalheatsource in the thermal model. Is this energy per unit volume [J/m3] or power per unit volume [W/m3]?

In general, is there any place where the units of measure used in the toolbox are clearly declared?

Thank you,

Best Answer

The unit of heatSourceValue in internalHeatSource is W/m3. You can refer Page No. 5-214 of Partial Differential Equation User’s Guide for more information.

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MATLAB: Capability pde toolbox, 3d application heat transfer

If your 3-D model that you discretize involve only cubes then you can model this in PDE. For example see attached image:

You can model this using:

model = createpde('thermal','transient')
gm = multicuboid(0.1,0.02,[0.1,0.1],'Zoffset',[0,0.1])
model.Geometry = gm;
pdegplot(model,'FaceLabels','on')

Then you can assign insulated BC on all the bottom cube faces. Assign heat generation on one or more of the top cube faces using funcitonal form of BC. Refer to thermalBC function.

Regards,

Ravi

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I think, but am not 100% sure, that the question makes no sense as posed. An instantaneous flux will not cause any change in the heat. You need to define a (short) time over which the flux is active. I believe that the situation is like this recent Answer, which has a bit of detail on what to do.

Alan Weiss

MATLAB mathematical toolbox documentation

Best Answer

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MATLAB: Capability pde toolbox, 3d application heat transfer

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