Development of Corrugated Tube
Ecoflux* Corrugated Tube Heat Exchangers (CTHE) use corrugated tubes instead of smooth tubes. The corrugations induce turbulence in the media and ensure high Reynolds number even at low velocity. The development of corrugated tube is perhaps the most exciting advancement in heat transfer technology.
Corrugated tube is produced by indenting a plain tube with a spiral pattern. No tube wall thinning takes place & no strength is lost.
- 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
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.
Hydrodynamic Thermal Boundary Layer
Increase in heat transfer coefficient brings the temperature of the tube wall closer to the temperature of the bulk fluid on the tube.
The roughness elements need to have a minimum height so as to influence the flow ( Fig. A ) and thus the heat transfer ( Fig. B ). To ensure that the heat transfer is improved by roughness elements, the flow must be influenced within the heat conduction layer.
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
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