Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
| Beide Seiten der vorigen RevisionVorhergehende ÜberarbeitungNächste Überarbeitung | Vorhergehende Überarbeitung | ||
| en:berechnungen:entgasungskennzahlen [2025/01/13 18:30] – neelest | en:berechnungen:entgasungskennzahlen [2025/09/03 12:19] (aktuell) – neelest | ||
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| ======Degassing index calculation====== | ======Degassing index calculation====== | ||
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| Degassing can only take place at the melt surface, with each screw rotation a defined | Degassing can only take place at the melt surface, with each screw rotation a defined | ||
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| zone: | zone: | ||
| - | $$t_{Entg.} = \frac{h}{D \cdot π \cdot N \cdot sinφ}$$ | + | $$t_{deg} = \frac{h}{D \cdot π \cdot N \cdot sinφ}$$ |
| - | The degassing surface $A_{Entg.}$ is the surface of the melt which is in contact with the air | + | The degassing surface $A_{deg}$ is the surface of the melt which is in contact with the air |
| and can degas, divided by the renewal time this gives the surface renewal rate: | and can degas, divided by the renewal time this gives the surface renewal rate: | ||
| - | $$A_{Entg.} = i \cdot h \cdot \frac{L}{\sin\varphi}$$ | + | $$A_{deg} = i \cdot h \cdot \frac{L}{\sin\varphi}$$ |
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| + | Furthermore, | ||
| - | The specific surface renewal results from the ratio of the degassing surface to the surface renewal time: | + | $$\pi_{deg} = \frac{A_{deg}}{ \sqrt{t_{deg}} \cdot \dot m}$$ |
| - | $$\dot{A}_{Entg.} = \frac{A_{pf}}{t_{pf}}$$ | + | The degassing surface depends solely on the length of the partially filled section. The renewal time decreases with increasing screw speed. The residence time is accounted for via the throughput in the characteristic degassing index. |
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| ===Further topics=== | ===Further topics=== | ||
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