Shell-and-tube exchangers general

SHELL AND TUBE EXCHANGERS GENERAL DESIGN CONSIDERATIONS... 

These high velocities occur at the bundle entrance and exit areas, in the baffle windows, through pass lanes and in the vicinity of tie rods, which secure the baffles in their proper position. In conjunction with this, the shell side fluid generally will take the path of least resistance and will travel at a greater velocity in the free areas or by-pass lanes, than it will through the bundle proper, where the tubes are on a closely spaced pitch. All factors considered, it appears a formidable task to accurately predict heat transfer characteristics of a shell and tube exchanger. 

The procedures for designing exchangers using the finned tubes are generally specific to the types of fins under consideration. The 16 and 19 fms-per-in. lowfm tubes (Figure lO-lOA and lO-lOB) are uniquely adaptable to the conventional shell and tube exchanger (see Table 10-39) and are the type of tubes considered here. 

Tinker, T. Proceedings of the General Discussion onHeat Transfer, September, 1951, p. 89. Analysis of the fluid flow pattern in shell and tube exchangers and the effect of flow distribution on the heat exchanger performance, (Inst, of Mech. Eng. and Am, Soc. Mech. Eng.). 

The following summarizes some of the advantages these designs have over the shell-and-tube exchanger, along with general disadvantages ... 

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