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Multi-longitudinal-vortex sine/cosine-line enhanced heat transferring tube

A longitudinal vortex, heat transfer tube technology, applied in the direction of tubular elements, heat exchange equipment, lighting and heating equipment, etc., can solve the problems of low comprehensive heat transfer performance, small application range, uncontrollable eddy current, etc., to improve the flow field and The degree of synergy of the temperature field, the effect of flexible use, and high-intensity fluid replacement

Inactive Publication Date: 2016-01-13
LISHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of large shape resistance, uncontrollable eddy current, small application range and low comprehensive heat transfer performance in the transverse vortex special-shaped tube, the purpose of the present invention is to provide a multi-longitudinal vortex sine (co)sine pattern enhanced heat transfer Heat pipe, the enhanced heat transfer tube can induce multiple longitudinal vortices through the ribs in the area close to the tube wall. Under the entrainment of the longitudinal vortex, the fluid forms a stream that sweeps up and down, impacts the wall, and realizes high-strength fluid flow. Replacement and flow field homogenization, so as to achieve the effect of increasing the temperature gradient near the wall, improving the coordination degree of the flow field and the temperature field, and increasing the heat transfer rate of the tube wall

Method used

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  • Multi-longitudinal-vortex sine/cosine-line enhanced heat transferring tube

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Embodiment 1

[0040] as attached Figure 3~5 As shown, the body rib pitch of the sine (co)sine pattern enhanced heat transfer tube with multiple longitudinal vortices L =20mm, rib amplitude A =12mm, the number of ribs in the circumferential direction n =2, outer diameter d =19mm, wall thickness t =2mm, rib height e =0.8mm, when applied, leave a certain distance between the two ends of the enhanced heat transfer tube, and then insert it into the tube sheet of the shell-and-tube heat exchanger, and use the method of expansion joint or welding or expansion welding to enhance heat transfer Tube fixation. In use, the fluid enters from one end of the tube, and under the induction of positive (cosine) strings, multiple longitudinal vortices along the flow direction are generated, forming radial fluid flow impacting the tube wall and radial fluid flow leaving the tube wall, reducing The angle between the velocity vector and the temperature gradient vector in the tube is reduced, which is lowe...

Embodiment 2

[0042] as attached Figure 6~8 As shown, the body rib pitch of the sine (co)sine pattern enhanced heat transfer tube with multiple longitudinal vortices L =30mm, rib amplitude A =16mm, the number of circumferential ribs n =4, outer diameter d =32mm, wall thickness t =3mm, rib height e =0.8mm, under common working conditions, the heat transfer rate is more than 50% higher than that of smooth tubes. Under the same power consumption, compared with smooth tubes, the maximum comprehensive heat transfer performance exceeds 1.2. Application method is the same as embodiment 1.

Embodiment 3

[0044] as attached Figure 9~11 As shown, the body rib pitch of the sine (co)sine pattern enhanced heat transfer tube with multiple longitudinal vortices L =25mm, rib amplitude A =12mm, the number of circumferential ribs n =6, outer diameter d =57mm, wall thickness t =3.5mm, rib height e =1.5mm, under common working conditions, the heat transfer rate is at most 1.3 times higher than that of smooth tubes, and under the same power consumption, compared with smooth tubes, the overall heat transfer performance is at most more than 1.4. Application method is the same as embodiment 1.

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Abstract

The invention relates to the technical field of heat exchanger heat transfer enhancing, in particular to a multi-longitudinal-vortex sine / cosine-line enhanced heat transferring tube. The multi-longitudinal-vortex sine / cosine-line enhanced heat transferring tube comprises a tube body. A plurality of tube body rib lines are rolled on the outer side wall of the tube body around the circumferential direction of the tube body, and the multiple tube body rib lines are sequentially distributed in the axial direction of the tube body and arranged in a sine functional image manner or a cosine functional image manner in the circumferential direction of the tube body. According to the multi-longitudinal-vortex sine / cosine-line enhanced heat transferring tube, a plurality of longitudinal vortexes can be inducted through the rib lines in an area near the tube wall, up-down-sweeping streams are formed through fluid under the entrainment effect of the longitudinal vortexes to impact the wall face, high-intensity fluid substitution and fluid field homogenizing are achieved, and therefore the effects that the temperature gradient near the wall is improved, the synergetic degree between a fluid field and a temperature field is improved, and the heat transferring rate of the tube wall is increased are achieved.

Description

technical field [0001] The invention relates to the technical field of enhanced heat transfer of heat exchangers, in particular to a multi-longitudinal vortex sine (cos) sinusoidal pattern enhanced heat transfer tube. Background technique [0002] Since the oil crisis in the 1970s, heat transfer enhancement technology has been widely used in various industries for energy conservation and emission reduction, such as traditional main industries such as power, metallurgy, petroleum, and chemical industry, as well as high-tech industries such as aviation, electronics, and nuclear energy. Due to the needs of industrial production and the development of science and technology, heat transfer enhancement technology has received extensive attention and considerable development in recent decades. Heat transfer enhancement technology can be divided into two types: active enhancement and passive enhancement according to whether it requires external work. Among them, passive enhancement ...

Claims

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Application Information

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IPC IPC(8): F28F1/12
Inventor 洪宇翔杜娟
Owner LISHUI UNIV
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