Inverse determination of glass viscosity and heat transfer coefficient by industrial testing

Abstract

In the numerical optimization of a new robotized glass blowing method, convection coefficient and glass viscosity are considered as parameters most influential in the forming process. Consequently, two tests in the industrial framework have been developed. In the first, the temperature is measured by a pyrometer on a glass ingot moved in rotation by the robot. In the second one, the robot holds the glass ingot vertically and the lengthening of the glass is recorded by video camera. In both cases, numerical modelling coupled with the inverse method completes the identification procedure. Finally, the integration of the identified properties in the modelling of the elongation of the glass considerably improves the representation of the real glass flow.