Helical insert for heat exchanger tubes - has S=shaped cross=section with reinforced core to create turbulent flow

摘要

The efficiency of a tubular heat exchanger is increased by the insertion of a helical plastic moulding of S-shaped cross-section into the tubes. The moulding has a central boss (2) with two curved arms (3) which are so arranged that the fluid flowing through the tube tends to press against the concave surface (5) of the arms. These mouldings have a tip diameter of between 95% and 100% of the bore of the tube. The helical flow induced by the mouldings creates a turbulence which increases the rate of heat transfer.