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Heat Transfer 189

Figure 10-118. Design chart for values. (Used by permission: Fair, J. R. Petroleum Refiner, Feb. 1960, p. 105. ©Gulf Publishing Company. All
rights reserved.)
Table 10-29
Values for Short-Cut Calculation of Circulation Rate (Equation 10-181)
Value Definition Remarks
_ _
x Two-thirds of outlet fractional vaporization x 2x E /3*
_ _
Liquid volume fraction based on one-third of outlet fractional vaporization Figure 10-114 for xx x E /3*
R L
_ _
Equation 10-179
_ _
tp Two-phase density based on R L

2 Pressure drop ratio based on two-thirds the outlet fractional vapor Figure 10-114 for xx 2x E /3*
Total tube length in which vaporization occurs
L CD
Z Vertical distance in which two-phase flow occurs Figures 10-110 and 10-111
_
x ia 2x E 2x ia x E
*For sparged reboilers where entering x o, x , and R L is based on x
3 3
Used by permission: Fair, J. R. Petroleum Refiner, V. 39, No. 2, p. 105, ©1960. Gulf Publishing Company. All rights reserved.