Shell and tube sides of a shell-and-tube heat exchanger

Physical Definitions of Shell-Side and Tube-Side: A shell-and-tube heat exchanger is like a giant "kettle," its interior divided into two independent channels by a bundle of metal tubes:

Tube-Side: Fluid flows inside the metal tubes, typically carrying corrosive/high-pressure media.

 

Shell-Side: Fluid flows in the shell space outside the tube bundle, suitable for high-flow/low-viscosity media.

 

The boundary between the two is the densely packed metal tube walls-which act as both an insulating barrier and a bridge for heat transfer.

 

Differentiated Logic of Functional Design

Flow Characteristics: Due to pipe diameter limitations, the tube side exhibits high flow velocity and large pressure drop; the shell side guides the fluid in a zigzag pattern through baffles, extending residence time.

 

Maintenance Considerations: Scaling on the tube side can be addressed with complete core removal cleaning, while the shell side requires chemical cleaning or high-pressure water jet treatment.

 

Material Selection: The tube side typically uses corrosion-resistant alloys, while the shell side often uses carbon steel linings to reduce costs.

 

Thermodynamic Code of Collaborative Working: When the high-temperature shell-side fluid flows over the tube bundle, heat "jumps" through the tube wall to the tube side:

The greater the temperature difference, the higher the heat transfer efficiency, but it is necessary to avoid stress deformation caused by a temperature difference exceeding 50°C on both sides of the tube wall.

 

Adding baffles to the shell side can increase heat exchange efficiency by 40%.

 

The common 4-tube pass design allows the fluid to flow back and forth twice, providing 15% more heat exchange area than a single tube pass.