Flooding curves

There is not a specific flood curve a pressure drop of 1.50 in HgO/ft is considered to represent an incipient flooding condition, although... 

The GPDC charts in Figs. 14-55 and 14-56 do not contain specific flood curves. Both Strigle and Kister and Gill recommend calculating the flood point from the flood pressure drop, given by the Kister and Gill equation... 

Nemunatis [8] observed the same flooding conditions below the saturation top curve (the Crawford-Wilke curve). In that instance, flood was noted at 20% of this saturation curve. Strigle [6] suggests that design not exceed a 12% value of the shown family of 100% flood curves. Note again that, whatever the ratio of Vc to VD, the curve for that specific ratio in Fig. 7.11 is indeed the 100% flood value for that particular extractor column condition. Therefore it is wise to place a loading 12% below flood levels before the extractor column is flooded. 

Based on the above reliability studies, the author recommends the Eckert flood correlation (the flood curve on Fig. 8.17) only for random packings whose packing factors Fp exceed 60. 

For high packing factors (Fp > 60), Eq. (8.1) predicts flood pressure drops greater than 2 in of water per foot of packings. In this situation, Eq. (8.1) will give similar predictions to those obtained from the flood curve on the Eckert correlation (Fig. 8,17). 

At flooding condition, Eckert s flooding curve is represented as ... 

X = abscissa in the generalized plot Y = ordinate in the generalized plot Y, = ordinate in Eckert s flooding curve Vqf = vapor velocity at 70% of flooding conditions, ft/s... 

The flooding curve in Figure 4.5 can be accurately described by the polynomial regression... 

Figure 10.5 Flooding curve for atomizing liquids with shock waves. (From Lyulin, 1998.)...

In the region below the flooding curves, the pressure drop can be correlated with an equation of the form... 

In the second design method, the flooding curve in Figure 10-27 or Eq. (10-39a is used. Then G qq j is calculated from the ordinate. The actual operating vapor flux will be some percent of G floojj- The usual... 

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