added unapplicable hagen Poiseuille

Durchflussraten.py

@@ -0,0 +1,14 @@
+import numpy as np 
+from math import pi 
+
+
+def Hagen_Poiseuille(dP,dx,r,vis):
+    Q = (pi*r**4)/(8*vis)*dP/dx
+    return Q
+
+
+def get_Q_from_dP(P_above,P_below,dx,constants=[1,1]):
+    r       = constants[0]
+    vis     = constants[1]
+
+