Good afternoon,
I ask for your help to solve a relatively simple problem on COMSOL Multiphysics. Indeed, I would like to study the kinetics of heating a plastic wire in a furnace (without any phase change). The goal is to know how long the wire takes to reach the furnace temperature setting.
To do this, I used the part "Heat transfer in solids" in which I simulated a solid plastic cylinder and a so-called air fluid environment (by adding a fluid domain in the study). I set the temperature of my hot air at 250 ° C and that of my wire at room temperature. I used the "initial values" section to set the initial temperatures. I also tried a calculation with the tool "temperatures", which allowed me to impose temperatures on the outer surfaces of my block of hot air and on the outer surface of the wire. However, when I start the simulation, first in stationary mode, I get an equilibrium at imposed temperatures. When I start the simulation in time mode (at different time scales) there is no temporal evolution of the temperatures and therefore no kinetics description.
In addition, the plastic cylinder is directly embedded in my air volume. Do the booleans in the geometry section allow to perform this subtraction properly?
I therefore ask for your help to help me solve this problem. I am a beginner in simulation and thermophysics, and I think that I do not set the right initial conditions, which leads to a wrong equilibrium.
I thank you in advance,