a pseudo-plastic material is flowing through a internal moving part (single screw extrusion), material enters to extruder at ambient temperature in a solid phase and get melt inside the extruder and comes out from the extruder at an elevated temperature. what is the procedure to find out temperature distribution and the distance at which the solid will completely get melt in cfd simulation?
The situation is not fluid analysis( correct me if i am wrong again). The situation is high temperature response of solid material which exhibit fluidic nature . So it is non metallic forming problem.
coming to point, temperature distribution depends on the hot or cold working reference temperature and at the point of phase chage temperature has to remain constant ( momentarily) so distribution is mainly on stress distribution which can be related back to stress = E*alpha*delta T, with in elastic zone and in plastic zone can be non linear with fractional power of delta T,
With CFD you cannot get distribution, I suppose
Please refer to manual of ANSYS fluent or earlier fluent tutorial for flow forming process.
This is very interesting problem containing phase change.
I think you should use moving mesh technique and porous enthalphy method.
A pseudo-plastic material flowing through a single extruder can be expressed by using moving mesh technique. When solid part is pushed into the extruder, heat is constabtly transferred into pseudo-plastic material, resulting in occuring phase change at some part of the pseudo-plastic material inside extruder. This can be described by using porosity enthalpy method which uses a fixed grid, which can simplify the problem very mech.
You can also study the effect of natural convection characteristics of liquidus part on the shape and propagation speed of melting zone.
Good luck~!
You can also describe your problem as rectangular channel if gravity effect is negligible. In this cas, you impose moving boundary condition on contact surfaces instead of using moving grid technique.
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