Learning Forum

[noureldin.ahmed30]

I am analysing the effect of thermal displacement generated by heater coil on the respective nozzle. I have modelled the coil as 1D beam element with predefines pipe cross section.

The coil heats up from ambient 22 C to 295 C during operation. I want to get the temperature discribution across welded reinforcement plate due to the effect of coil heating  so that I can evluate the effect of further applied mechanical loads on the coil nozzle to the reinforcement plate. What is the best methodology in steady state thermal analysis to simulate this?

The results shown always the coil is at 295 C and the plate is 22 C. No heat transfer through the plate is calculated.

[peteroznewman]

In the first image, there are two temperature boundary conditions. However you are not showing any details for those two boundary condtions, only the temperature solution for all bodies. What entites were selected for those two boundary condtions?  Was that only coil beam edges split between two BCs?

In the second image, there is only one temperature boundary condition. Is this simply applying the same temperature to all coil beam edges?

In order to have a steady state solution that is interesting, you need a boundary condtion on the model to allow heat to leave the system such as convection or radiation, otherwise the solution would be a uniform temperature everywhere that condutction allows heat to flow.  Try adding convection to the surface body.

However, the contact is not providing any conduction becuase it is two edges that don't touch each other.  Edit the Bonded Contact Formulation and change it to Beam instead of MPC and assign a suitable beam radius such as 50 mm. By default, it will take on the conductivity of the default material, Structural Steel.

Below I link to an example I tried this on.  Unfortunately, the image upload function on this new site is broken.

https://imgur.com/a/JE0nIVc

[noureldin.ahmed30]

Thank you, below images shows the two temperature boundary conditions. First one 22 C assigned to the heater's roof plate. Second one 295 C assigned to the beam element representing the coil.

I have changed the bonded contact formulation to beam and finally there is a conduction detected on the solution as shown on the snapshot but there are two observations:

1- The temperature distribution is not euqal on the plate (upper location shows gradual temperature decay until it equalize with ambinet while the lower part starts with 37.5 C.

2- If i assigned 22C temperature bounday condition to the reinforcement plate instead of roof plate, the results are the coil is steadily at 295C while the entire roof and reinforcement plate are at 22 C. 

 

[noureldin.ahmed30]

I can't upload images... How can I share them with you? can you share your email?