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Helical piping

A pipeline and pipeline technology, applied in the field of pipelines carrying fluid, can solve the problems of reducing the cross-sectional area of ​​the pipe, pressure loss, and increasing flow resistance.

Inactive Publication Date: 2006-06-21
IMPERIAL INNOVATIONS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this has the disadvantage of increasing the wetted circumference of the tube and, in the case of ribs, reducing the cross-sectional area of ​​the tube
Both the grooves and the ribs lead to increased resistance to flow and consequent pressure loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] refer to figure 1 parameters shown, the outer diameter of the pipe D E 12mm, inner diameter D I is 8mm, and the wall thickness T is 2mm. The pipe is helically wound with a pitch P of 45 mm and a helix angle θ of 8°. The amplitude A can be determined by placing the pipe between two straight edges and measuring the separation between the straight edges. The outer diameter D E Subtracting from the sweep width W, the amplitude can be determined:

[0050] 2A=W-D E

[0051] therefore A = W - D E 2

[0052] In this example, the sweep width W is 14mm, so

[0053] A = W - D E 2 = 14 - 12 2 = ...

example 2

[0060] The parameters of this example are the same as Example 1 except that only two needles 80 and 82 are provided to release ink filaments 84 and 86 near the tube wall. figure 2 Shown are the results of two experiments, in which ink filaments are released near the tube wall, with Reynolds numbers Re=500 and 250, respectively. It can be seen that in both cases the ink filaments follow the helical tube geometry, indicating the formation of vortices near the tube wall.

example 3

[0062] In a separate study, the relative amplitude A R Flow comparison for a helical tube of 0.45. In both cases the Reynolds number was 500 and a 0.2 ml bolus of indicator was injected upstream through the thin tube. The flow was filmed along with a digital clock showing the time elapsed since the indicator was injected.

[0063] The indicator bolus injected into the helical part restricts dispersion along the axial direction of the tube, trying to remain cohesive. In contrast, in straight tubes, in the core fluid (near the center of the tube), the indicator flows out of the tube very quickly, whereas Indicators in the fluid near the tube wall try to remain on the tube wall and take a longer time to flow out of the tube. Additionally, in a helical tube the indicator travels in a more compact mass than in a straight tube. All these findings suggest that there is mixing in the cross-section of the tube and that the velocity distribution is blunted in the helical tube.

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Abstract

The invention relates to tubing comprising a portion whose centerline follows a substantially helical path, wherein the amplitude of the helix is ​​less than or equal to half the inner diameter of the tubing. When fluid flows in such a pipeline, the flow can be made into a vortex. It has many advantages, such as improving the mixing of fluids in the plane, improving the uniformity of residence time, etc. The invention also relates to various methods of making such tubing.

Description

technical field [0001] The present invention relates to tubing for carrying fluids. Background technique [0002] It is known that fluids can flow in a "vortex flow" and this flow is discussed in WO 97 / 28637 in relation to the head line and suction pipe of the turbine. Swirl flow can be achieved by forming head lines or suction pipes whose centerlines are curved in three dimensions. [0003] Vortex flow has many advantages over normal flow. Pressure loss (and energy loss) through turbulence can be reduced. Additionally, the velocity distribution of the flow across the pipe cross-section is more uniform (or more obtuse) than normal flow. As a result, the fluid flowing in a swirling pattern acts like a plunger, removing deposits or debris that may have accumulated on the tube walls. This is especially important in hydropower plants. [0004] Pipelines with identical three-dimensional curves for use in production and processing plants are also discussed in WO 02 / 093063. I...

Claims

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Application Information

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IPC IPC(8): F16L11/12A61F2/06B29C47/00B29C48/32B29C53/14B29C53/58F16L9/00
CPCA61F2002/068B01J8/062B01J2219/1944B29C53/14F16L9/00F16L11/121B29C48/131F16L11/11F16L11/12
Inventor 科林·G·卡罗尼克拉斯·V·沃特金斯
Owner IMPERIAL INNOVATIONS LTD