IMPINGING STREAMS drawing

The essential parts included in the impinging stream crystallizer are the cylindrical vessel (1) the upper and lower drawing tubes (2) co-axially fixed in the vessel (1) and the upper and lower propellers (3) and (4) set up inside the upper and lower drawing tubes, respectively, which are driven by the same motor and have the spiral blades with opposite screw directions, i.e., one is the left screw and the other is the right. The vessel 1 contains the process medium, crystals-in-solution suspension, with the level over the... 

If Re was kept constant in scaling-up, a very small impinging velocity u() would be employed for a large system with a large diameter drawing tube da. On the other hand, the kinetic energy for the impingement is supplied by the streams, which are positively... 

As can be expected, the intensive fluctuation region is symmetrical with respect to the impingement plane, provided the two streams leaving the drawing tubes are at the same velocity. This is simply because the two sides of the reactor have the same structure. In addition, the figures also show that the region is essentially symmetrical about the flow axis, suggesting that the above assumption is reasonable. 

The intensive fluctuation region is concentrated between the outlets of the drawing tubes and around the flow axis, and takes the form of a couple of truncated cones with an empty core and with coinciding bottoms. The region is symmetrical with respect to both the impingement plane and the axis of the streams and is essentially independent of nn. The space surrounded by the external surface of the cones is defined as the impingement zone. 

It will be seen from the drawing that feed lines 14 and 24 converge and junction with tubular reactor 15 at one end thereof, and in the embodiment illustrated, the two feed lines and the tubular reactor form a simple T tube section, free of moving parts, obstruction, or constrictions, as illustrated in Fig 2. The separate streams of polyhydric alcohol and precooled nitrating acid thus converge and impinge upon each other at the point where the two feed lines junction with the tubular reactor The nitrating acid for this process contains... 

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