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- Brand Name:zhejiang huanchen
Twisted tube
Twisted tube is a kind of enhanced heat transfer tubes that firstly presented by Swedish Alards Company, and then improved by the USA’ Koch Heat
Transfer Company, LP.
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 tube’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.
Application of the Twisted tube
As twisted tube has been fast developed and improved in recent years, it is much more reliable and effective, which can almost be used in all kinds of
shell and tube heat exchangers. More than 1000 twisted tube heat exchangers have been used since 1984, which can be used in gas-gas, liquid-liquid and liquid-gas heat transfer process, including
chemistry, petroleum, food, papermaking, electric power, metallurgy, mining, and urban heating industries.
