Corrugated Tubes are made by indenting a helical pattern along the length of the tube. CTHEs basically increase the turbulence along the periphery of the tube surface thus reducing the boundary layer. Reduction in the boundary layer reduces the wall resistance and thus gives a higher heat transfer coefficient. CTHEs operate at the same Reynolds number but at a higher Nusselt number due to the increase in side coefficient.
Corrugated tube is produced by indenting a plain tube with a spiral pattern. This imparts different flow regimes – spiral in the core and eddy’s at the periphery.
The helical flow contributes to the situation that the fluid particles are alternatively in the vicinity of the tube wall and then in the main flow. Between the helical impressions, around the circumference of the tube, secondary flow, typically in the form of eddies occur.
The flow regime ensures that the rate of decrease in boundary layer resistance exceeds the rate of increase in pressure loss. In other words high heat transfer coefficients with minimum increase in pressure drop.
- A smooth indented inner profile ensures easy cleaning
- Turbulence is created at low fluid velocities to enhance the heat transfer in the tube
- Fouling on the tube surface is minimised
- A wide range of diameters & styles are available
End Result of CTHE
- CTHE’s ongoing research and development
- In-Depth analysis of Corrugation profiles and flow dynamics
- Constant testing for various condensing applications
What’s new in CTHE ?
- New & Improved Corrugation profiles for condensers resulting in even higher heat transfer coefficient
- Compact & Economical design , hence higher savings
- Manufacture ability in all exotic material like Hastelloy, Titanium, Tantalum & Super Duplex Steels,etc
Corrugated tube shell and tube heat exchangers have many benefits and advantages over comparable smooth tube versions:
- Compact tubular heat exchanger
- Long running times due to turbulent flow
- Very low maintenance costs, minimum spares requirement
- Higher heat transfer coefficient (2-3 times) results in reduction in heat exchanger area upto 50%
- Fouling is minimised due to turbulence created by eddies at the periphery or tube wall
- High response to CIP
- Wide choice of MOC
- Uniform thermal processing
- More flexibility in annular space sizing