Analysis Of Heat Transfer During Glass Forming

A thermal model is described which is intended to simulate internal heat transfer in glass being cooled by the mould and plunger after pressing. The heat transfer analysis in glass accounts for the spectral nature of radiation, the dependence of the thermophysical properties of glass on temperature and the contact heat transfer between mould and glass as well as plunger and glass during and after pressing. Heat exchange between glass and mould as well as plunger across a very small gap by contact conduction and thermal radiation are also accounted for. To assess the utility of the Rosseland diffusion approximation for radiative transfer, the results are compared with those based on rigorous formulation of radiative transfer.