Friction factors shell-side

The friction factor, f, is determined using Figure 10-140 for shell-side pressure drop with D, used in determining R,. For bundles with hare tubes (plain tubes), f, = f/1.2 (see Figure 10-140), calculate pressure drop ... 

Figure 10-140. Shell-side friction factors for low-finned and plain tubes. (Used by permission Engineering Data Book, 1960. Wolverine Tube, Inc.)...

This equation gives values that are half of those calculated as total gas flow for the shell side by using friction factors from Figure 10-140. (Note that f for plain or bare tubes = f/1.2 (with f from Figure 10-140)). 

Figure 10-148. Shell-side friction factors for bundles with 20%-cut segmental baffles, one seal strip per 10 rows of tubes, and TEMA clearances. These factors can be used for plain or low-finned tubes with the appropriate values of D s or d s. (Source Engineering Data Book, 1960. Wolverine Tube, Inc. Used by permission Kern, D. Q., and Kraus, A. D. External Surface Heat Transfer, p. 511, 1972. McGraw-Hill Book Co., Inc. All rights reserved.)...

Pj = shell-side pressure drop, psi friction factor, fP/ in. cross-flow mass velocity, lb/ (ft ) (hr) shell I.D., ft = number of baffles... 

Figure 10-155. Shell-side friction factor, f , for pressure drop calculation is determined from plot vs. Reynolds Number, z = viscosity at average flowing temperature, centipoise. (Used by permission Brown Fintube Co., A Koch Engineering Company, Houston, Texas.)...

Figure 9.82. Shell-side friction factors with segmental baffles "8 ...

Figure 12.30. Shell-side friction factors, segmental baffles...

For the calculated shell-side Reynolds number, read the friction factor from Figure 12.30 and calculate the shell-side pressure drop from ... 

AP, = pressure drop across shell if = shell-side friction factor ... 

For a Reynolds number of 59 500, the shell-side friction factor is obtained from Ref. E2 (Figure 12.39) as 0.36. Therefore ... 

A = area of heat transfer, ft2 subscripts m designates mean area subscript 0 designates outside area subscript / designates film area b0 = constant in Eq. (32) for evaluating shell-side friction factor, dimensionless... 

Fr = friction due to reversal of flow direction, ft lbf/lbm Fs = safety factor in Eq. (29) to account for bypassing on shell side of exchanger, dimensionless... 

Heat-transfer coefficient for cross flow over an ideal tube bank Fouling coefficient on outside of tube Heat-transfer coefficient in a plate heat exchanger Shell-side heat-transfer coefficient Heat transfer coefficient to vessel wall or coil Heat transfer factor defined by equation 12.14 Heat-transfer factor defined by equation 12.15 Friction factor... 

Figure 8-12. Friction factors for shell-side surfaces of low-finned and bare tubes.

CALCULATE THE FRICTION FACTOR IN THE SHELL SIDE OF THE EK>UBLE PIPE HEAT EXCHANGER (Dennis Wright Basic Programs for chemical engineers. Van Nostrand Reinhold company, NY 1986)... 

To transform the friction factor to a shell side pressure drop, the number of the fluid crossing the tube bundle should be given. Because the fluid crosses between baffles, the number of crosses will be one more than the number of baffles, A b- If the number of baffles is unknown, it can be determined using the baffle spacing and tube length L ... 

Cp, Cp fluid heat capacity, Btu/(lb °F) di inner diameter of the tube, ft do outer diameter of the tube, ft De equivalent shell diameter, ft Ds shell diameter, ft /s shell side friction factor, (ft °F h)/Btu /t tube side friction factor, (ft °F h)/Btu Ft LMTD correction factor, fraction hi tube side film coefficient, Btu/(ft °F h) shell side film coefficient, Btu/(ft °F h) k fluid thermal conductivity, Btu/(h ft °F)... 

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