Abstract
By using double exposure holographic interferometry, supersonic free jets emanating from nozzles which appear in the process of a glass quenching were observed. Three different nozzle shapes for producing tempered glass were tested, and an axisymmetric free jet emanating from a 4-mm-i. d. and 24-mm-long nozzle was numerically simulated by TVD finite difference scheme applied to the Navier-Stokes equations. In the stagnation pressure ranging from approximately 0.5 MPa to 0.6 MPa, good agreement was obtained between interferograms and computations. Complicated structures of free jets were well resolved and a time variation of pressure caused by shock waves in the jets which would affect the process of glass tempering was clarified.
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