Experimental Studies on the Combined Flow Field Formed by a Moving Wall and a Wall Jet Running Parallel to It
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In order to make more clear the flow field when manufacturing a film or a sheet cooled by a wall jet, fundamental studies on the combined flow field formed by a moving wall and a two-dimensional wall jet running parallel to it were performed experimentally. The existence of a critical distance, where the gradient of the velocity profile at the surface of the moving wall was changed from positive to negative, was ascertained, and factors influencing the critical distance were identified. It becomes clear that there are some cases where the combined flow field can not be treated by a widely employed relative velocity of the respective reference velocities of the moving wall and the wall jet. Some practical data on the critical distance were given.
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