Jeff Hiller
COMSOL Employee

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Posted:
10 months ago
Oct 17, 2023, 9:25 a.m. EDT

Updated:
10 months ago
Oct 17, 2023, 9:24 a.m. EDT

Hello Alexey,

It is certainly possible to evaluate the effective properties of an inhomogeneous material using simulation. See this tutorial for an example. If your composite is periodic, you may be able to get away with simulating a single cell, as illustrated in this second example. If on the other hand you need to generate a large number of nanoparticles randomly distributed in the matrix, see this blog post on how to do it through a script.

Best,

Jeff

-------------------

Jeff Hiller

Hello Alexey,
It is certainly possible to evaluate the effective properties of an inhomogeneous material using simulation. See [this tutorial](https://www.comsol.com/model/effective-diffusivity-in-porous-materials-978) for an example. If your composite is periodic, you may be able to get away with simulating a single cell, as illustrated in [this second example](https://www.comsol.com/model/equivalent-properties-of-periodic-microstructures-23621). If on the other hand you need to generate a large number of nanoparticles randomly distributed in the matrix, see [this blog post](https://www.comsol.com/blogs/how-to-create-a-randomized-geometry-using-model-methods/) on how to do it through a script.
Best,
Jeff

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Posted:
10 months ago
Oct 22, 2023, 10:43 a.m. EDT

Hello Alexey,

It is certainly possible to evaluate the effective properties of an inhomogeneous material using simulation. See this tutorial for an example. If your composite is periodic, you may be able to get away with simulating a single cell, as illustrated in this second example. If on the other hand you need to generate a large number of nanoparticles randomly distributed in the matrix, see this blog post on how to do it through a script.

Best,

Jeff

I'm grateful for response. I successfully created the geometry of nanocomposite. The only one problem now is how to measure thermal conductivity? Is there some standart algorithm in COMSOL?

>Hello Alexey,
>
>It is certainly possible to evaluate the effective properties of an inhomogeneous material using simulation. See [this tutorial](https://www.comsol.com/model/effective-diffusivity-in-porous-materials-978) for an example. If your composite is periodic, you may be able to get away with simulating a single cell, as illustrated in [this second example](https://www.comsol.com/model/equivalent-properties-of-periodic-microstructures-23621). If on the other hand you need to generate a large number of nanoparticles randomly distributed in the matrix, see [this blog post](https://www.comsol.com/blogs/how-to-create-a-randomized-geometry-using-model-methods/) on how to do it through a script.
>
>Best,
>
>Jeff
I'm grateful for response. I successfully created the geometry of nanocomposite. The only one problem now is how to measure thermal conductivity? Is there some standart algorithm in COMSOL?

Jeff Hiller
COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted:
10 months ago
Oct 23, 2023, 9:39 a.m. EDT

Updated:
10 months ago
Oct 23, 2023, 9:45 a.m. EDT

You derive the equivalent conductivity of a sample from the formula q=-k*grad(T) .

You run a simulation with an imposed heat flux through the sample and obtain from that simulation the temperature drop; then using the formula above (and the length of the sample, as you can approximate ) you get k.

Jeff

-------------------

Jeff Hiller

You derive the equivalent conductivity of a sample from the formula q=-k*grad(T) .
You run a simulation with an imposed heat flux through the sample and obtain from that simulation the temperature drop; then using the formula above (and the length of the sample, as you can approximate grad(T) \approx \Delta T / L ) you get k.
Jeff