Please give me some advice on how to measure or model the radiation heat transfer of a glass powder coating on a steel substrate during the heating up and soaking period of the enamelling process.
300 to 500 micro thickness of glass powder coating on a 2-6 mm thick steel plate, heating up on a radiant heater furnace, the temperature of the glass powder coating during the heating up period will increase from room temperature to 800/850C, and the glass powder will change from solid powder to semi-liquid. The thermal properties of the coating layer will change during the heating up periods.
Measurement/model requirements:
Method to measure/model the fraction of reflection, absorption, and the transmission part of the incident radiation glass powder coating layer at a different temperature during the heat up. Method to measure/model the absorptivity, transmissivity and emissivity of the glass powder coating layer at a different temperature during the heat up.
I think, this can be model using COMSOL multiphysic HT moule, however there can be some trick that needs to be justified.
I will suggest you to go through the HT module video, this will certainly help.
hello, in NASTRAN I would try to have a solid mesh of the steel with the glass powder coating idealized with 2D elements (face of 3D skin). It is possible to give temperature dependent absorbivity (and emissivity) transparency seems not impemented. So the radiation transmitted to the solid steel might be implemented as a secondary applied heat thus leading to an iterative solution: first run no secondary applied heat: out glass temp vs time: calc residual radiation impacting on the steel due to transparency of coating. Superimpose this as applied heat on the top surface of the steel bricks: re-run the model and iterate. Might be tricky???
I will suggest you to using an IR spectrometer which has all range of IR radiation that is help you to find the wavelength of the heating radiation and analyze it.
For your safety you can install it in a sufficient distance with a proper optical view.
Optical pyrometer can help you but it can’t help you to analyzing the results.
Sorry if it isn’t useful. I am in harrying up.
Best regards
I agree very much with the first answer by Ishant Jain since I too use COMSOL Multiphysics for my own work. If you are interested in modelling in addition to an experimental procedure, COMSOL is a very powerful tool which might enable you to sole your problem using Finite Element Analysis. In this case, you can browse through some COMSOL models at http://www.comsol.com/showroom/product/heat-transfer-module/?page=1 to get an idea about the power of the tool. If you are keen enough to make an account in that website, you will get access to actual COMSOL models and pdfs providing the modeling guidelines. Another software that might be able to simulate your problem is Ansys. Ansys is a very reputed and established software which has been around for nearly a half a century. It is not very difficult to get the hang of any of these software since very good documentation and technical support is available. It is definitely worth trying to simulate these type of problems in FEA packages since these efforts have led to revolutionary simulation models which have become very famous. All the best !
thanks for your answer.
How about another FEA packages: ABAQUS which is also very powferul .......
Personally I have not felt the need to use ABAQUS. ABAQUS is more of a general purpose package where you have to formulate the problem from the scratch. But, if you have sufficient expertise to do so, you might be able to use even ABAQUS. But, the specialty of the other software are that they have tailor made modules for certain cases. For instance, COMSOL has a heat transfer module. Therefore, it saves the user from having to hard code the problem since the equations are inbuilt. In COMSOL, you hardly get to hard code anything to be frank. Everything can be easily specified through the user interface. However, there are some instances where you have to define your own equations. In such instances, the users can do that as well. In addition, the user interface and result visualization capability of COMSOL are very attractive. If I was asked to solve your problem, I would definitely have a go at COMSOL before ABAQUS. However, if you are comfortable with ABAQUS, you may want to start with it.
Thank you for your above anawers on what is major difference on the difference FEA packages for example COMSOL. ANSYS , and abaqus in modelling the heat transfer
It would be very interesting to model the same heat transfer problem with these three FEA packages and to compare the result and the feasibility between each package. Do you know if there is any work has been done on this?
Thanks
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