# Turndown Curve 1

The following table show the specifications of the turndown 1.

 Pipeline (m) 25 Riser (m) 13,5 Radius bend (cm) 50 Liquid mass fraction (-) 0,9981 Gas mass fraction (-) 0,0019

Four different total mass flow rate were simulated in this case. These simulations represent the four points to the left from the lowest point. It will be paid specific attention to the relation between the turndown point (lowest point of the turndown curve) and the existence of severe slugging.

For the following set of figures, the graph to the left indicates the point that is going to be simulated in a transient fashion. The graph to the right, shows in this order: the pressure at the pipeline bending, the volume fraction at the pipeline bending, the volume fraction at the pipeline outlet, the mass flow rate of the liquid at the pipeline outlet and the mass flow rate of the gas at the pipeline outlet.

• Point 1, Total mass flow rate $Ft\;=\;0,2807\;kg/s$ • Point 2, Total mass flow rate $Ft\;=\;0,5614\;kg/s$ • Point 3, Total mass flow rate $Ft\;=\;0,8421\;kg/s$ • Point 4, Total mass flow rate $Ft\;=\;1,26314\;kg/s$ From the observation of this set of figures, It can be said that there is an absence of the severe slugging phenomenon as the studied point moves toward the Turndown point (lowest point of the Turndown Curve).
Yet , it cannot be conclude that this type of behaviour appears for all geometry configuration. This subject will be broaden in the further sections.