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0 0.1 0.2 0.3 0.4 0.5 Ratio of baffle cut to shell diameter, tC/D$

0 0.1 0.2 0.3 0.4 0.5 Ratio of baffle cut to shell diameter, tC/D$

FIG. 11-6 Estimation of fraction of tubes in cross-flow Fc [Eq. (11-8)]. To convert inches to meters, multiply by 0.0254. Note that lc and Ds have units of inches.

6. Cross-flow area at or near centerline for one cross-flow section Sm a. For rotated and in-line square layouts:

Doti- Do

pn b. For triangular layouts

7. Fraction of cross-flow area available for bypass flow Fbp

8. Tube-to-baffle leakage area for one baffle Stb. Estimate from

where b = (6.223)(10-4) (SI) or (1.701)(10-4) (U.S. customary). These values are based on Tubular Exchanger Manufacturers Association (TEMA) Class R construction which specifies h-in diametral clearance between tube and baffle. Values should be modified if extra tight or loose construction is specified or if clogging by dirt is anticipated.

9. Shell-to-baffle leakage area for one baffle Ssb. If diametral shell-baffle clearance Ssb is known, Ssb can be calculated from

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