Can you determine a good approximation (a single constant value) for the pressure drop (using the pressure change vs height of the reactor figure. To do this take points (z,P) and find the slope, which will give you Pressure/Unit length. Take multiple points and average these slopes to find the best approximation for pressure drop. 6 5 4 N 3 2 103000 102000 Pression 120000 118000 104000 116000 105000 114000 112000 106000 110000 108000 107000 106000 104000 108000 102000 100000 112000 109000 2 111000 3 R Figure 73: Evolution of the pressure (Pa) inside the tank under reference conditions. Figure 73: Pressure (Pa) inside the shaft in the reference conditions.