Helical tubing
A technology for pipelines and pipelines, which is applied in the field of pipelines carrying fluids, and can solve the problems of increasing flow resistance, reducing the cross-sectional area of pipes, and increasing the wet circumference of pipes, etc.
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example 1
[0050] 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:
[0051] 2A=W-D E
[0052] therefore A = W - D E 2
[0053] In this example, the sweep width W is 14mm, so
[0054] A = W - D E 2 = 14 - 12 2 = ...
example 2
[0061] 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
[0063] 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.
[0064] 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.
PUM
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Abstract
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