Dear friend Abdourhamane Touré

Comsol Multiphysics is a powerful tool for simulating heat transfer and phase change phenomena. To simulate the phase change of PCM in a system composed of two concentric hollow cylinders, the following steps can be taken:

1. Create the geometry of the system in Comsol Multiphysics, using the geometry module.

2. Define the material properties of the PCM in the material library.

3. Define the thermal boundary conditions on the inner cylinder to represent the hot smoke passing through it.

4. Set up the heat transfer physics model to solve for the temperature distribution and phase change of the PCM.

5. Define the phase change properties of the PCM, such as latent heat and melting temperature.

6. Set up appropriate initial and boundary conditions, such as the initial temperature distribution and the heat flux at the outer boundary of the PCM.

7. Run the simulation and analyze the results, such as the temperature distribution and the amount of PCM that has undergone phase change.

Comsol Multiphysics provides extensive documentation and tutorials to help with simulating heat transfer and phase change phenomena. Some useful references include:

- "Phase Change" tutorial in the Comsol Multiphysics User's Guide

- "PCM Energy Storage" tutorial in the Heat Transfer Module User's Guide

- "Phase Change Materials" application example in the Comsol Multiphysics Application Library.

Additionally, Comsol Multiphysics has a user community forum where users can ask questions and get help with their simulations.

Hello Kaushik Shandilya first of all thank you for your time. This is my first time using this software. But I would love if you have the time to follow me step by step.

First step: for the PCM simulation I chose: model wizard, 3D, then as physics I chose "laminar flow and heat transfer in solid" in the select study section I chose "time dependent" is it correct??

How to indicate to comsol that the annular space of my cylinders is a PCM? Because for the first time I tried I built the annular space of the cylinders as the two cylinders (solid) and comsol did not accept.

Sorry for my English which is not good (I am French speaking).

Can you contact me on my whatsApp at +90 5348774805 that way I could send you the images. the project is urgent for me it will make me very happy. I've been stuck for 2 months.

Thanks Kaushik Shandilya