Because of the direction of ellipse changing periodically, flowing within the twisted ellipse-tubes cause the strong disturbed flows featuring rotating longitudinally and secondary swirling flow. Because of turbulent motion enhanced, the temperature of internal surfaces of tube becomes the same as main fluid’, and the temperature difference between outside and inside surface becomes bigger; meanwhile due to the increasing of velocity magnitude, the internal sublayer thickness reduces. The heat transfer in tube is greatly intensified based on the synthesized acting of these two factors.

The fluid in shell side flows longitudinally. The local velocity and pressure vary in the axial direction periodically to enhance the turbulent motion and the flow became turbulent in the early stage. Meanwhile the disturb is caused by the shape of tube, and the dispersing of flowing is caused by supporting rod（See attached drawing）.

High efficiency swirl-type heat exchangers can be suitable for the case that needs intensifying heat transfer both inside and outside the tube, especially for the work fluids with high viscosity and low velocity.  

1  The heat transfer enhancement is available both inside and outside the tube simultameously.

2  Good enhanced heat transfer, low flow resistance.

3  It has long service life cycles. As the shell side stream is basically longitudinal flow, the vibrations of the tube bundles is decreased, which usually can induce the cracking of heat transfer tube. Furthermore, this type flow eliminates the transverse flow dead zones, decreases fouling rate and prolong the life cycle of heat exchanger.

1  The total heat transfer coefficient is generally increased by 30% than plain tube.

2  flow resistance of shell side is decreased by 10%.

3  product specification：diameter: φ≤3000,length: L≤9000

tube diameter: φ10-φ32, tube length: L≤9000