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Non-continuous double diagonal internal rib reinforced heat exchange tube

A technology of inclined inner rib and heat exchange tube, applied in the direction of heat exchanger shell, tubular element, heat exchange equipment, etc., can solve the problems of low processing efficiency, large flow resistance and high manufacturing cost, and achieve simple molding and small flow resistance. , Good anti-fouling effect

Inactive Publication Date: 2003-10-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common disadvantages of these heat exchange tubes are large flow resistance, easy fouling in the recirculation area near the ribs or grooves, low processing efficiency, and high manufacturing costs

Method used

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  • Non-continuous double diagonal internal rib reinforced heat exchange tube
  • Non-continuous double diagonal internal rib reinforced heat exchange tube
  • Non-continuous double diagonal internal rib reinforced heat exchange tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] figure 1 It is a structural schematic diagram of a discontinuous double inclined internal rib enhanced heat exchange tube. The inner side of the tube has a discontinuous bidirectional helical protrusion (abbreviated as "discontinuous bidirectional helical inner rib"), and the outer side of the tube has a discontinuous bidirectional helical groove.

[0019] figure 2 for figure 1 A-A sectional view in .

[0020] image 3 for figure 2 Partial enlarged view of B in middle.

[0021] exist figure 1 and figure 2 Among them, 1 is the discontinuous two-way helical rib inside the tube, and 2 is the discontinuous two-way helical groove outside the tube; the helical rib and the helical groove are formed simultaneously during processing. figure 1 where d is the hydraulic inner diameter of the heat exchange tube, P is the axial length of a single double-slope inner rib, and C is the helix angle of the double-slope inner rib. image 3 where h is the height of the double ob...

Embodiment 2

[0023] Figure 4 It is a schematic diagram of part of the circumferentially expanded structure of another discontinuous double inclined internal rib enhanced heat exchange tube. The inside of the tube has discontinuous two-way spiral protrusions (double oblique inner ribs), and the outside of the tube is a smooth wall.

[0024] Figure 4 Among them, 3 is a discontinuous two-way spiral rib and is symmetrically arranged; a right-handed diagonal rib and a circumferentially adjacent left-handed diagonal rib form a vortex generator; in the same cross section, there are 4 diagonal ribs along the circumferential direction to form two vortex generators . Figure 4 C is the helix angle of the double oblique inner rib, C≈±50 degrees; a positive value means right-handed, and a negative value means left-handed, where C is the right-handed angle. Figure 4 Among them, 4 is a schematic illustration of the longitudinal vortex generated by the fluid near the inner wall under the action of ...

Embodiment 3

[0026] Figure 5 It is a schematic diagram of another kind of discontinuous double inclined internal rib enhanced heat exchange tube, which is partly developed in the circumferential direction. The inner side of the tube has discontinuous two-way helical protrusions (double oblique inner ribs), and the outer side of the tube has discontinuous two-way helical grooves.

[0027] Figure 5 Among them, 5 is a discontinuous two-way helical rib inside the tube and is arranged asymmetrically, 6 is a discontinuous two-way helical groove outside the tube and is asymmetrically arranged; a right-handed oblique rib in the pipe and a circumferentially adjacent left-handed oblique rib form a vortex generator; There are six oblique ribs on the inner wall of a small section of pipe (less than 0.5d) to form three vortex generators.

[0028] The best implementation of the discontinuous double-slope internal rib heat exchange tube is rolling or molding. The rolling and rolling forming process ...

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Abstract

A heat exchanging tube is characterized by that on its inner surface there are discontinuous internal ribs which have a certain included angle (5-85 deg.) relative to axis of tube and are inclined intwo directions. Its advantages are high heat exchange efficiency, low flow resistance and not scaling.

Description

technical field [0001] A discontinuous double inclined internal rib enhanced heat exchange tube belongs to the technical field of enhanced heat exchange and heat exchangers. Background technique [0002] Shell-and-tube heat exchangers are widely used in petroleum, chemical, power and many other fields. Shell-and-tube heat exchangers usually use smooth circular cross-section tubes, which have the advantages of simple manufacturing process, good safety, and low cost, but at the same time, due to the unsatisfactory heat transfer performance of smooth circular The heater has the disadvantages of large volume and many consumables. In order to change this situation, people have invented various enhanced heat exchange tubes instead of ordinary round tubes. Based on the idea of ​​wall turbulence enhancement, many convective heat transfer enhancement components have been developed in the past 30 years. In particular, heat exchange tubes with rough surfaces obtained by rolling have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F1/42
CPCF28F1/42F28F1/426
Inventor 孟继安过增元胡桅林李志信
Owner TSINGHUA UNIV
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