CN109612320B - Turbulent flow element and turbulent flow pipe for reducing turbulence critical Reynolds number - Google Patents
Turbulent flow element and turbulent flow pipe for reducing turbulence critical Reynolds number Download PDFInfo
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- CN109612320B CN109612320B CN201811377491.6A CN201811377491A CN109612320B CN 109612320 B CN109612320 B CN 109612320B CN 201811377491 A CN201811377491 A CN 201811377491A CN 109612320 B CN109612320 B CN 109612320B
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- turbulent flow
- reynolds number
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
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- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Thermal Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The application discloses a turbulence element and a turbulence tube for reducing turbulence Reynolds number, wherein the turbulence element comprises at least two support rods and a plurality of rib plates which are arranged in parallel; the rib plates are fixed between two adjacent support rods and keep a certain angle with the support rods, and each rib plate is arranged in a scattered manner along the length direction of the support rods; the supporting rod rotates into a multicycle spiral shape according to a certain spiral rate Y, and the rib plates fixed on the supporting rod rotate into an arc shape along with the supporting rod. The application generates high-strength longitudinal vortex in the fluid by the induction of the inclined rib plates, and improves the mixing degree of a near wall area and a core flow area in the tube because the rotation direction of the vortex is parallel to the tube axis, damages the development of a boundary layer, improves the heat flow density of the tube wall, and is further beneficial to improving the heat transfer rate. The application can reduce the critical turbulence Reynolds number of the fluid in the pipe by enhancing the heat transfer of the fluid, thereby obviously improving the comprehensive heat transfer performance of the fluid in the pipe at low Reynolds number.
Description
Technical Field
The application relates to the technical field of heat exchanger enhanced heat transfer, in particular to a turbulence element and a turbulence pipe for reducing turbulence critical Reynolds number.
Background
Laminar flow is a common flow working condition in a heat exchanger, the Reynolds number is low, fluid particles are not mutually collided and mixed, and regular parallel flow is carried out along a tube axis. Particularly high viscosity fluids, are in laminar flow under many conditions. The smooth tube is used as a common tube for the heat exchanger, and when laminar heat transfer is applied, the disturbance to the fluid is small, and the heat transfer rate is low; turbulent flow is more intense than laminar flow momentum and heat exchange, and therefore, in order to increase heat transfer efficiency, it is conventional to convert laminar flow into turbulent flow. However, to achieve turbulent flow, the reynolds number needs to be 4000 or more, and the power consumption is large.
For the working condition of low Reynolds number in the pipe, strengthening elements such as a replacement device or a torsion strap are often adopted in industry to reduce the critical Reynolds number of turbulent flow in the pipe, promote the state of the flow in the pipe to reach turbulent flow in advance, and improve the mixing capacity and the heat transfer rate in the pipe. However, in many cases, the mixing uniformity of the flow field in the pipe is insufficient, the strength of the vortex is low, the friction resistance or the shape resistance is large, the lifting amplitude of the heat transfer rate in the pipe is limited, and the comprehensive heat transfer performance is poor under the power consumption.
Disclosure of Invention
In order to solve the technical problems, the application provides the turbulence element and the turbulence tube for reducing the turbulence Reynolds number, and the reinforced element generates high-strength longitudinal vortex in fluid through the induction of the inclined rib plates. The application can reduce the critical turbulence Reynolds number of the fluid in the pipe by enhancing the heat transfer of the fluid, thereby obviously improving the comprehensive heat transfer performance of the fluid in the pipe at low Reynolds number.
In order to achieve the above object, according to one aspect of the present application, there is provided a spiral rib plate strengthening heat transfer element,
a turbulence element for reducing the critical Reynolds number of turbulent flow,
comprises at least two support rods arranged in parallel and a plurality of rib plates;
the rib plates are fixed between two adjacent support rods and keep a certain angle with the support rods, and each rib plate is arranged in a scattered manner along the length direction of the support rods;
the supporting rod rotates into a multicycle spiral shape according to a certain spiral rate Y, and the rib plates fixed on the supporting rod rotate into an arc shape along with the supporting rod.
Preferably, the number of the support rods is two, and two ends of the rib plate are respectively fixed on the two support rods.
Preferably, the rib plate is provided with a plurality of through holes for reducing backflow vortex of the lee surface of the rib plate.
Preferably, the through hole is a round hole.
Preferably, each adjacent rib is arranged in parallel on the support bar before the support bar rotates into a spiral shape.
Preferably, the stagger angle between adjacent rib plates is 15 ° to 75 ° before the support rod is rotated into a spiral shape.
Preferably, each adjacent rib is symmetrically distributed on the support rod before the support rod rotates to be spiral.
Preferably, the helix ratio y=2 to 8.
Preferably, the included angle between the supporting rod and the rib plate is 15-75 degrees.
In another aspect of the present application, a turbulent flow tube is provided, the turbulent flow tube includes a tube body and the turbulent flow element as described above, the turbulent flow element is longitudinally disposed in the tube body, and the turbulent flow element guides the fluid in the tube body to generate a plurality of longitudinal vortex along-path forces through the multicycle spiral structures and the arc rib plates fixed between the spiral structures.
Compared with the prior art, the application has the beneficial effects that:
1) The application provides a turbulent flow element with a spiral structure of an arc rib plate, which guides fluid to generate a plurality of longitudinal vortex along the flow direction of the turbulent flow element so as to effectively homogenize a flow field, improve the temperature gradient of a wall surface and further improve the heat transfer efficiency. The application can generate large-scale mixing of longitudinal vortex in the turbulent flow pipe by guiding fluid, and has stronger mixing capability and higher heat transfer efficiency compared with the transverse vortex turbulent flow pipe.
2) Compared with a typical torsion strip, due to the along-path relay of the longitudinal vortex and the opening of the spiral rib plate, part of fluid is converged with the fluid behind the inclined rib plate through the round hole, so that the backflow vortex of the leeward surface of the inclined rib plate can be obviously reduced, the body resistance is further reduced, and the comprehensive heat transfer performance is better.
3) The reinforced element is convenient to process and easy to install, can be used for the design of a novel heat exchanger and the upgrading of an old heat exchanger, and can obviously reduce the scaling in a tube of a high-viscosity fluid due to the vortex generated by the guiding fluid.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a front view of a rib of embodiment 1 of the present application;
FIG. 2 is a side view of embodiment 1 of the present application prior to rotation into a helical configuration;
FIG. 3 is a top view of embodiment 1 of the present application prior to rotation into a helical configuration;
FIG. 4 is a schematic perspective view of the embodiment 1 of the present application after being rotated into a spiral configuration;
FIG. 5 is a front view of embodiment 1 of the present application after rotation into a helical configuration;
FIG. 6 is a top view of embodiment 1 of the present application after rotation into a helical configuration;
FIG. 7 is a side view of embodiment 2 of the present application prior to rotation into a helical configuration;
FIG. 8 is a top view of embodiment 2 of the present application prior to rotation into a helical configuration;
FIG. 9 is a schematic perspective view of embodiment 2 of the present application after being rotated into a spiral configuration;
FIG. 10 is a side view of embodiment 3 of the present application prior to rotation into a helical configuration;
FIG. 11 is a top view of embodiment 3 of the present application prior to rotation into a helical configuration;
fig. 12 is a schematic perspective view of embodiment 3 of the present application after being rotated into a spiral configuration.
Detailed Description
The application will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the background art, for working conditions of low Reynolds number in the heat exchange tube, strengthening elements such as a replacement device or a torsion strap are often adopted in industry to reduce critical Reynolds number of turbulence in the tube, promote the flow state in the tube to reach turbulence in advance, and improve the mixing capacity and heat transfer rate in the tube. However, in many cases, the mixing uniformity of the flow field in the pipe is insufficient, the strength of the vortex is low, the friction resistance or the shape resistance is large, the lifting amplitude of the heat transfer rate in the pipe is limited, and the comprehensive heat transfer performance is poor under the power consumption. Based on this, specific embodiments of the present application will be described in detail:
a turbulence element for reducing turbulence critical Reynolds number comprises a plurality of rib plates and two mutually parallel support rods for fixing the rib plates, wherein, as shown in figure 1, two ends of the rib plates are respectively fixed on the two support rods, round holes are arranged on the rib plates, the rib plates are distributed along the length direction (namely the fluid flow direction) of the support rods, and generally, the rib plates can be arranged in parallel (as shown in figure 2) or in cross (as shown in figure 5). The range of the height H of the rib plate is as follows: h=3 to 20mm, and the length L of the rib plate has the following range: l=10-40 mm, and the corresponding value range of the diameter D of the round hole is as follows: d=2 to 15mm, the inclination angle a=15 to 75 degrees between the longitudinal direction of the rib plate and the longitudinal direction of the supporting rod, and the value range of the distance P between two adjacent rib plates is as follows: p=10 to 40mm. In addition, the value range of the diameter d of the supporting rod is as follows: d=2-5 mm, and the crossing angle between the adjacent rib plates is 15-75 degrees. After the rib plate and the supporting rod are integrally fixed and formed, the rib plate and the supporting rod rotate according to the spiral rate Y to obtain a spiral turbulence element, wherein the spiral rate Y has the following value range: y=2 to 8, the definition of the helix ratio is: the ratio of the length S of the support rod after being screwed 360 DEG to the width B of the screw rod (as shown in figures 5 and 6).
The following describes the present application further by way of example with reference to the above-described embodiment, wherein each embodiment is required to be combined with the above-described structure, and the embodiments of the present application are not limited thereto, and all simple modifications or changes to the essence of the present application are included in the scope of the technical solution of the present application. In addition, to evaluate the performance of the various embodiments, the overall heat transfer performance was defined as:
PEC＝(Nu/Nu 0 )/(f/f 0 ) (1/3) ；
wherein PEC represents comprehensive heat transfer performance, i.e. performance evaluation criteria (performance evaluation criterion, PEC), nu 0 And Nu represents the dimensionless heat transfer rate (i.e., nuceous number) of the light pipe and the enhanced pipe, respectively, f 0 And f represents the dimensionless pressure drop of the light pipe and the reinforcing pipe, namely the friction factor, respectively, and if PEC is more than 1 under the same power consumption, the comprehensive heat transfer performance is improved relative to the light pipe, otherwise, the comprehensive heat transfer performance is not improved.
Example 1
As shown in fig. 1 and 2, the rib plate has a height h=4mm, a length l=19 mm, a plate thickness t=4mm, each rib plate is arranged in parallel on the support rod, 3 round holes are formed in the rib plate in a dispersed manner, the diameter D of each round hole is=2mm, the distance a1=3.5 mm between the round holes, the distance a2=3 mm between the support rod and the round holes, the inclination angle a=60°, the pitch p=20mm, the diameter D of the support rod is=2mm, and the torsion ratio Y of the spiral rib plate is=4.
The application method comprises the following steps:
the rib plate is fixed on the supporting rod, and the supporting rod with the rib plate fixed thereon is screwed according to the screw rate Y, so that the multicycle spiral turbulence element is formed (as shown in figures 3, 4, 5 and 6). The turbulence element is arranged in the turbulence pipe and fixed by spot welding, so that the assembly and disassembly are convenient. In use, fluid enters from one end of the turbulent flow pipe, longitudinal vortex along the flowing direction of the fluid is generated under the induction of the turbulent flow element, the vortex scours the pipe wall, the high-temperature fluid and the low-temperature fluid are driven to be mixed, the included angle between the velocity vector in the pipe and the temperature gradient vector is reduced, the volume weighted average cooperative angle is lower than the included angle between the velocity vector in the pipe and the temperature gradient vector, which is close to 90 degrees, the cooperation of the temperature field and the velocity field is improved, and compared with the light pipe, the replacement strength of the fluid in the pipe is greatly improved, and the boundary layer is thinned. Due to the periodicity of the spiral structure of the turbulence element, longitudinal vortex is repeatedly formed, is not easy to attenuate, and forms cooperative relay in the middle of each pitch with lower resistance, so that better heat transfer rate is obtained. Under common working conditions, compared with the traditional smooth pipe, the critical Reynolds number is lower than 1000, the heat transfer rate is improved by more than 100%, and the comprehensive heat transfer performance PEC can reach more than 2 under the same power consumption.
Example 2
As shown in fig. 7 and 8, the difference between the rib plate layout on the support bar and the rib plate layout on the support bar in this embodiment is that the intersection angle of two adjacent rib plates along the flow direction is 60 °, and the two rib plates are oppositely arranged to be bilateral symmetry, and after the support bar drives the rib plate to spiral, the structure diagram is shown in fig. 9, and other structures are the same as those of embodiment 1, and the application method is the same as that of embodiment 1.
Example 3
As shown in fig. 10, 11 and 12, the plate height h=6 mm, the length l=25 mm, the plate thickness t=6 mm of the rib plates are parallel to each other, 3 round holes are formed in the rib plates, the diameter d=3 mm of each round hole, the distance a1=3.5 mm between the adjacent round holes, the distance a2=3 mm between the support rods and the round holes, the inclination angle a=45°, the pitch p=20 mm, the diameter d=2 mm of the support rods and the torsion ratio y=4 of the spiral rib plates. Under common working conditions, compared with the traditional smooth pipe, the critical Reynolds number is lower than 1000, the heat transfer rate is improved by more than 150%, the comprehensive heat transfer performance reaches more than 2.5 under the same power consumption, and the application method is the same as that of the embodiment 1.
The vortex element provided by the application utilizes the inclination angle of the arc-shaped rib plate and the fluid flowing direction, longitudinal vortex is induced in the flow field, the rib plate is screwed according to a certain screw rate under the fixation of the supporting rod, the strength and the influence area of the longitudinal vortex are further improved under the double functions of the inclination angle and the screw, the fluid displacement capability is greatly improved in the main flow core area and the wall area, the fluid particle collision is enhanced, the uniformity degree of the flow field and the temperature field is improved, and the heat flux of the pipe wall is improved. Of course, the turbulence element is applicable not only to circular channels, but also to rectangular channels. Because the turbulence critical reynolds number can be reduced, and higher turbulence can be obtained at a smaller flow rate, the turbulence element is suitable for low-reynolds number flow of high-viscosity fluid and low-reynolds number flow of low-viscosity fluid. The resistance is actively regulated and controlled by arranging the plurality of rib plates in the flowing direction and forming holes in the rib plates, so that under the condition of low Reynolds number, the high heat transfer rate is ensured, and smaller fluid power consumption is also achieved, and the low-resistance high-efficiency enhanced comprehensive heat transfer performance can be obtained as a whole.
The foregoing is only one embodiment of the present application, and it should be apparent to those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.
In addition, it should be noted that:
reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
While the foregoing description of the embodiments of the present application has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the application, but rather, it is intended to cover all modifications or variations within the scope of the application as defined by the claims of the present application.
Claims (8)
1. A turbulence element for reducing turbulence critical Reynolds number is characterized in that,
comprises at least two support rods arranged in parallel and a plurality of rib plates;
the rib plates are fixed between two adjacent support rods and keep a certain angle with the support rods, and each rib plate is arranged in a scattered manner along the length direction of the support rods;
the supporting rod rotates into a multicycle spiral shape according to a certain spiral rate Y, and the rib plates fixed on the supporting rod rotate into an arc shape along with the supporting rod;
the two support rods are respectively arranged, and the two ends of the rib plate are respectively fixed on the two support rods;
and a plurality of through holes for reducing backflow vortex of the lee surface of the rib plate are formed in the rib plate.
2. A turbulence element for reducing a critical reynolds number of turbulent flow as claimed in claim 1, wherein the through hole is a circular hole.
3. A turbulence element for reducing the critical reynolds number of a turbulent flow as claimed in claim 1, wherein each adjacent rib is arranged in parallel on the support bar before the support bar is rotated into a helical shape.
4. A turbulence element for reducing the critical reynolds number of a turbulent flow as claimed in claim 3, wherein the stagger angle between adjacent ribs is 15 ° to 75 ° after the support bar is rotated into a spiral shape.
5. A turbulence element for reducing the critical reynolds number of a turbulent flow as claimed in claim 1, wherein each adjacent rib is arranged symmetrically left and right on the support bar before the support bar is rotated into a helical shape.
6. A turbulence element for reducing a critical reynolds number of a turbulent flow according to claim 1, wherein the helix ratio Y = 2-8.
7. A turbulence element for reducing a critical reynolds number of turbulent flow as claimed in claim 1, wherein the angle between the support bar and the rib is 15 ° to 75 °.
8. A turbulent flow pipe, characterized by comprising a pipe body and a turbulent flow element as claimed in any one of claims 1-7, wherein the turbulent flow element is longitudinally arranged in the pipe body, and the turbulent flow element guides fluid in the pipe body to generate a plurality of longitudinal vortex along-way relay forces through a multicycle spiral structure and arc rib plates fixed between the spiral structures.
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| CN201811377491.6A CN109612320B (en) | 2018-11-19 | 2018-11-19 | Turbulent flow element and turbulent flow pipe for reducing turbulence critical Reynolds number |
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| CN201811377491.6A CN109612320B (en) | 2018-11-19 | 2018-11-19 | Turbulent flow element and turbulent flow pipe for reducing turbulence critical Reynolds number |
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| CN109612320B true CN109612320B (en) | 2023-09-05 |
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| CN112986056A (en) * | 2021-02-09 | 2021-06-18 | 太原理工大学 | Resistance reduction experimental device for reducing circular tube development turbulence section and using method thereof |
| CN112985156B (en) * | 2021-02-25 | 2022-06-10 | 内蒙古工业大学 | Fluid transposition mixing plug-in unit, fluid transposition mixing plug-in and heat absorption pipe |
| CN116167175A (en) * | 2022-09-05 | 2023-05-26 | 上海飞象健康科技有限公司 | Design method of turbulent flow pipeline structure based on Karman vortex street theory |
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