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Heat transfer gap elements

Heat transfer gap elements

Heat transfer gap elements

(OP)
I am modelling the transient heat transfer between glass and mould.  Between the glass and mould is an air gap of 0.2mm which affects the heat transfer.

I am modelling in 2d using plane 55 elements for the glass and mould.  My questions are:

i) WOuld a CONTACT 151 element be suitable for this.?
ii)How do you mesh these gaps? I have tried meshing but with no success.

Model
_________________________________________
l                      l       l        l    
l  glass (1200 degrees)l  gap  l  mould l  convection
l                      l       l        l
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