Baffles are used in the shell to direct the fluid stream across the tubes, to increase the fluid velocity and so improve the rate of transfer. The most commonly used type of baffle is the
single segmental baffle shown in Figure 8.a, other types are shown in Figures 8.b, c and d.
Baffle diameter:
            Baffle diameter refers to the outer diameter of the baffle. A clearance must be provided between the shell inside diameter and baffle diameter to avoid shearing of baffle.
Bundle diameter clearance (BDC):
Bundle diameter clearance is referred to as the gap between the bundle diameter and the shell diameter.
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