| 摘要 |
The invention relates to piping comprising a portion wherein the centreline of the portion follows a substantially helical path, wherein the amplitude of t he helix is less than or equal to one half of the internal diameter of the piping. When fluid flows in such piping, it is made to swirl. This provides a number of advantages, such as improved in-plane mixing of the fluid, enhance d uniformity of residence time, and so on. The invention also extends to vario us methods of making such piping.
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