In an exchanger, where is accelerated corrosion most likely to occur?

Accelerated corrosion in heat exchangers is most likely to occur at the tube inlets. This is primarily due to the differential velocities and turbulence that can create localized wear and erosion at the points where fluids enter the tubes. High flow rates and turbulence can contribute to the formation of corrosion pits, especially in environments with corrosive fluids. The combination of aeration, velocity changes, and potentially stagnant or low flow conditions leads to more aggressive corrosion processes.

In contrast, the bundle exit typically does not experience the same level of turbulent flow and potential corrosive damage as the inlets, as the fluid dynamics are less aggressive. The shell exterior is generally more protected from corrosion in many contexts since it is less exposed to high-velocity flow. Thermal expansion regions are critical points in a pressure vessel but contribute more to issues related to thermal stress and fatigue rather than specifically to accelerated corrosion in the same manner that tube inlets do.