Corrugated Tube Heat Exchangers
What is a corrugated tube in heat exchangers?
A corrugated tube is a pipe with an helical groove obtained from a plain tube by cold forming. The number of starts of the helix can be changed as well as the angle to optimise the heat transfer and performance.
Furthermore, the mechanical properties of the original plain tube are not reduced, being this recognised by TÜV. (Independent German certification company worldwide recognized).
Advantages and main features of corrugated tube heat exchangers
Similar drainability to a plain tube, as there are no dead zones.
Different corrugation geometries
HARD Corrugation. Allows to achieve a very high improvement of heat transfer coefficient which compensates the inherent increase in pressure loss.
SOFT Corrugation. Intermediate between smooth tube design and tube corrugation HARD improving heat transfer to a lesser extent, but with lower pressure drop.
Turbulent flow, that is achieved with lower Reynolds number that for smooth tubes
The greatest advantage of the corrugation is increased fluid turbulence when flowing through the inner tube, which means that can work in a turbulent flow even with a low Reynolds number. In fact, while for a smooth tube the transition regime between laminar and turbulent flow is around 2000-2500, in a corrugated tube this transition can be located close to Reynolds 500.
Higher heat transfer coefficients
If you compare it to plain Shell and Tube Heat Exchangers.
Lower exchange area
In some cases half the required area with smooth tubes.
Homogeneus thermal treatment
Due to the mixing capability enhanced by the corrugation.
Because of the self-cleaning effect provided by the higher turbulence levels.
Shorter residence times
Without stopping for cleaning, having a higher response to CIP.