Longitudinal Flow in Tube Bundles with Grid Baffles
DOI 10.1615/hedhme.a.000258
3.3 SHELL-AND-TUBE HEAT EXCHANGER
3.3.12 Longitudinal Flow in Tube Bundles with Grid Baffles
Jerry Taborek
A. Characteristics of longitudinal flow
There are two fundamental modes of flow on the outside of tube bundles:
- crossflow, perpendicular to the tubes;
- longitudinal flow, parallel to the axis of the tubes.
Flow in shell-and-tube heat exchangers with cross baffles will have generally some components of both flow types. With segmental baffles crossflow is predominant but with multi-segmental baffles, longitudinal flow is a major component. A different type of baffle is discussed here, termed the “grid” or “rod” baffle, with which the shell operates essentially in longitudinal flow, interrupted only by a grid of rods or strips which support the tubes against sagging.
The main characteristics of longitudinal flow in tube bundles are summarized here as follows:
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