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Nächste Überarbeitung		Vorhergehende Überarbeitung
en:berechnungen:feststofffoerderung [2025/07/03 13:35] – cschallen:berechnungen:feststofffoerderung [2025/09/03 12:56] (aktuell) – [Application in REX] neelest
Zeile 23: Zeile 23:
 Based on the throughput calculation according to //Schneider//, which is not reproduced in detail here, the transition speed $N_ü$ is now calculated as follows: Based on the throughput calculation according to //Schneider//, which is not reproduced in detail here, the transition speed $N_ü$ is now calculated as follows:
  
-$N_ü = \frac{\dot m_{max}}{\rho_s*B*h*\pi*D}*\frac{sin(\alpha+\varphi)}{sin(\alpha)}$+$N_ü = \frac{\dot m_{max}}{\rho_s*A*\pi*D}*\frac{tan(\alpha)+tan(\varphi)}{tan(\alpha)*tan(\varphi)}$
  
-with the bulk density $\rho_s$, the channel width $B$, the channel depth $h$, the diameter $D$, the back pressure-dependent solids conveying angle according to //Schneider// $\alpha$ and the pitch angle $\varphi$.+with 
 + 
 +$A = \frac{\pi}{4}*(D^2-D_K^2)-\frac{i*e*h}{sin(\overline{\varphi})}$ 
 + 
 +with the bulk density $\rho_s$, the screw diameter $D$, the screw core diameter $D_K$, the cross-sectional area $A$, the flight width $e$, the number of flights $i$, the channel depth $h$, the back-pressure-dependent solid conveying angle according to //Schneider// $\alpha$, and the helix angle $\varphi$.
  
 <details><summary>Sources</summary> <details><summary>Sources</summary>
Zeile 37: Zeile 41:
 If the calculation setting for the throughput ‘Coupling solids conveying’ is selected, the calculation in REX/PSI is performed as follows: If the calculation setting for the throughput ‘Coupling solids conveying’ is selected, the calculation in REX/PSI is performed as follows:
  
-Firstly, the melt-dominated throughput without solids conveying is calculated. From this, the pressure at the [[en:berechnungen:aufschmelzverlauf|melt vortex formation]] is calculated back from the screw tip and the known back pressure. The melt vortex formation is assumed to be the location up to which there is pure solids conveying and therefore serves as the interface between melt conveying and solids conveying.\\\+Firstly, the melt-dominated throughput without solids conveying is calculated. From this, the pressure at the [[en:berechnungen:aufschmelzverlauf|melt vortex formation]] is calculated back from the screw tip and the known back pressure. The melt vortex formation is assumed to be the location up to which there is pure solids conveying and therefore serves as the interface between melt conveying and solids conveying.\\
 Based on the known location and pressure at the melt vortex formation, the solids conveying throughput can then be calculated. This can be higher or lower than the melt-dominated calculated throughput. Based on the known location and pressure at the melt vortex formation, the solids conveying throughput can then be calculated. This can be higher or lower than the melt-dominated calculated throughput.
 If the calculated throughput is lower, the pressure at the melt vortex formation is recalculated with a reduced throughput from the tip of the leg. The back pressure of the solids conveying zone is therefore lower and the solids conveying throughput is therefore higher. \\ If the calculated throughput is lower, the pressure at the melt vortex formation is recalculated with a reduced throughput from the tip of the leg. The back pressure of the solids conveying zone is therefore lower and the solids conveying throughput is therefore higher. \\