High Grade Twisted Tube

We are exporting and supplying of High Grade Twisted Tubes from Shanghai, China. Twisted tube is a kind of enhanced heat transfer tube that firstly presented by Swiss Allares Company, and then improved by the US Koch Heat Transfer Company,
Structure and manufacture of twisted tube
The structure feature of twisted tube is that every cross section is an oval, when when assembled into heat exchangers they exchanger they can be mixed bundles (that is, the mix of twisted tubes and bare tubes), and also can be a pure twisted tube bundle.
The manufacturing process of twisted tube includes:"partial pressure" and "distortion". The tubea s cross section is nearly an ellipse, of which the ratio of long axis and short axis is designed according to the flow velocity in tubes passes and shell passes of heat transfer tubes. When the flow rate in tube pass is low, the ratio of the long axis and short axis shall be increased, or the flow surface shall be reduced in order to increase the flow rate.
Enhanced heat transfer principles of twisted tube
The unique structure of twisted tube can make the flow in tube pass and shell pass in the spiral motion at the same time, by this way it enhanced the turbulent intensity. The heat transfer coefficient of the twisted tube is 40% higher than the normal one, but the pressure drop is almost the same.