Correction factor for pressure drop

Fpb = bypass correction factor for pressure drop to allow for flow between the tube bundle and the shell wall and is a function of the shell to bundle clearance (see Appendix C)... 

FIG. 11-17 Correction factor on pressure drop for bypass flow. 

Find the correction factor for the effect of baffle leakage on pressure drop Ri from Fig. 11-16. Cni ves shown are not to be extrapolated beyond the points shown. 

Bypassing will affect the pressure drop only in the cross-flow zones. The correction factor is calculated from the equation used to calculate the bypass correction factor for heat transfer, equation 12.30, but with the following values for the constant a. 

One approach is to calculate the pressure drop for gas flow only and then multiply this pressure drop by a factor which accounts for the effect of the liquid flow. Equation 4.19 may be used for predicting the pressure drop for the gas only, and then the pressure drop with gas and liquid flowing is obtained by using the correction factors for the liquid flow rate given by Sherwood and Pigford(56). ... 

FIGURE 19.13 Pressure-drop correction factor for water... 

FIG. 11-16 Correction factor for baffle-leakage effect on pressure drop. 

With the average velocity and channel size now expressed in terms of the measurable parameters Vq, Dp, and e, thp channel model can be used to predict the form of the correlation for pressure drop. For flow at very low Reynolds numbers, the pressure drop should vary with the first power of the velocity and inversely with the square of the channel size, in accordance with the Hagen-Poiseuille equation for laminar flow in straight tubes, Eq. (5.16). The equations for V and ), are used in Eq. (5.16), and a correction factor Aj is added to account for the fact that the channels are actually tortuous and not straight and parallel ... 

Now compute the pressure drop on each fluid side, after correcting /factors for variable property effects, in a manner similar to step 8 of the rating problem for the crossflow exchanger. 

Table 2.1 Correction factor, for two-phase flow based on the liquid phase pressure drop.

FIGURE 19.13 Pressure-drop correction factor for water in the liquid state. International Engineering Associates.)... 

The reference pressure drop was corrected in the following manner. The Sgr corresponding to steady-state polymer flow was calculated on the basis of the final extracted oil saturation. The volume of oil produced by each polymer solution was summed so that corresponding oil saturations could be calculated by material balance. The original was divided by the k rt tha corresponded to that saturation to yield a correction factor for APtw-... 

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