12. Number of baffles Nb

where le is the entrance/exit baffle spacing, often different from the central baffle spacing. The effective tube length L must be known to calculate Nb, which is needed to calculate shell-side pressure drop. In designing an exchanger, the shell-side coefficient may be calculated and the required exchanger length for heat transfer obtained before Nb is calculated.

Shell-Side Heat-Transfer Coefficient Calculation 1. Calculate the shell-side Reynolds number (NRe)s.

where W = mass flow rate and |lb = viscosity at bulk temperature. The arithmetic mean bulk shell-side fluid temperature is usually adequate

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