The influence of the hydrodynamic environment on the growth phenomena of large potassium dihydrogen phosphate (KDP) crystals has been investigated in a three vessel system. Special attention was paid to the onset of inclusion formation. Flow visualization experiments carried out in a wind tunnel showed that the flow formed a t the rear (downstream) faces of the crystal (i.e. the wake) is a more or less closed circulation system. It appeared that veils of liquid inclusions are not a result of starvation in the laminar boundary layer, as suggested before, but of depletion in the closed wake a t the rear.Der EinfluB der hydrodynamischen Umgebung auf die Wachstumserscheinungen groBer KDP-Kristalle wurde in einem Dreitanksystem untersucht. Besondere Aufmerksamkeit galt der EinschluBbildung. Beobachtungen im FlieSexperiment in einem Windkanal zeigten, daS das AnwiirtsflieDen an den hinteren Fllichen des Kristalls (d. h. der Nachstrom) ein mehr oder weniger geschlossenes Zirkulationssystem darstellt. Die Schleier von fliissigen Einschliissen erschienen nicht als Ergebnis der Erschopfung in der laminaren Grenzschicht, wie vorher angenommen wurde, sondern der Erschopfung im geschlossenen hinteren Nachstrom.
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