Simulation as the essential tool
Progress in computing heat flow
The CFD model of a glass melting furnace shows the temperatures and flow in a glass tank furnace. The arrows indicate the direction and strength of the local flows. The colors represent the temperature values in the glass melting bath.
In the glass industry an important aspect of product manufacturing using thermal processes is the intermediary and permanent mechanical stresses that are formed. These can be either unintentional – as in the case of optical glass – or deliberate, as for example in the case of toughened “Duran” borosilicate glass. Decisive for these stresses are temperature gradients inside the glass that are set up in the course of the process. If these gradients can be calculated dependent on the process control, they can be optimized on the computer. In this way it is possible for example to produce glass panels with the required degree of toughening by heating them up significantly above the glass transition temperature and then subjecting them to massive cooling. With the appropriate heat source, thermal radiation can be deliberately used for extremely effective heat transmission and thus for very rapid hot forming purposes as in the case of manufacturing ovenware.
Measuring probes for glass melts