CN109612320A - For reducing the turbulent element and disturbed flow pipe of turbulent flow critical Reynolds number - Google Patents
For reducing the turbulent element and disturbed flow pipe of turbulent flow critical Reynolds number Download PDFInfo
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- CN109612320A CN109612320A CN201811377491.6A CN201811377491A CN109612320A CN 109612320 A CN109612320 A CN 109612320A CN 201811377491 A CN201811377491 A CN 201811377491A CN 109612320 A CN109612320 A CN 109612320A
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- Prior art keywords
- floor
- turbulent
- support rod
- reynolds number
- reducing
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Classifications
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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
Abstract
The invention discloses a kind of turbulent element and disturbed flow pipe for reducing turbulent Reynolds number, the turbulent element includes at least two support rod and muti-piece floors disposed in parallel；The floor is fixed between two adjacent support rods, and is kept at an angle with the support rod, length direction scattering device of each floor along support rod；The support rod is rotated into the helical form of multicycle according to certain spiral rate Y, and the floor being fixed on the support rod rotates with camber shape.The induction that the present invention passes through inclination floor, high-intensitive longitudinal turbulence is generated in fluid, since vortex direction of rotation is parallel to pipe axis, improve the mixability of near wall region and core flow region in pipe, destroy the development in boundary layer, the heat flow density of tube wall is improved, and then is conducive to promote rate of heat transfer.The present invention can reduce the critical turbulent Reynolds number of tube fluid by the augmentation of heat transfer to fluid, and then significantly improve complex heat transfer performance of the tube fluid in low reynolds number.
Description
Technical field
The present invention relates to Summarization on heat transfer enhancement in heat exchangers fields more particularly to a kind of for reducing turbulent flow critical Reynolds number
Turbulent element and disturbed flow pipe.
Background technique
For laminar flow as flow operating mode common in a kind of heat exchanger, Reynolds number is lower, between fluid particle mutually do not collide and
It does not mix mutually, does well-regulated PARALLEL FLOW along pipe axis.Especially high viscosity fluid, under many operating conditions, all in laminar flow.
Smooth tube is smaller to the disturbance of fluid when application-level flow is conducted heat as a kind of common heat exchanger cast, rate of heat transfer compared with
It is low；Turbulent flow is more strong with respect to the momentum of laminar flow and heat exchange, therefore, improves heat transfer efficiency to allow, conventional way is
Turbulent flow is converted by laminar flow.But reach turbulent flow, Reynolds number needs to reach 4000 or more, and the power consumption paid is larger.
For Low Reynolds number in pipe, industrially usually reduced in pipe using reinforced elements such as displacement apparatus or twisted strips
Turbulent flow critical Reynolds number promotes flow regime in pipe to reach turbulent flow in advance, improves mixed and rate of heat transfer in managing.But
In many cases, pipe flow field mixture homogeneity is inadequate, and vortex intensity is lower, and frictional resistance or form drag are larger, manages interior pass
Hot rate promotes limited extent, etc. under power consumptions, complex heat transfer performance is bad.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of turbulent element for reducing turbulent Reynolds number and disturb
Flow tube, which generates high-intensitive longitudinal turbulence by the induction of inclination floor in fluid, due to being vortexed rotation side
To pipe axis is parallel to, the mixability of near wall region and core flow region in pipe is improved, the development in boundary layer is destroyed, improves
The heat flow density of tube wall, and then be conducive to promote rate of heat transfer.The present invention can be reduced in pipe by the augmentation of heat transfer to fluid
The critical turbulent Reynolds number of fluid, and then significantly improve complex heat transfer performance of the tube fluid in low reynolds number.
To achieve the goals above, one aspect of the present invention provides a kind of spiral floor enhanced heat transfer component,
A kind of turbulent element for reducing turbulent flow critical Reynolds number,
Including at least two support rod and muti-piece floors disposed in parallel；
The floor is fixed between two adjacent support rods, and is kept at an angle with the support rod, each
Length direction scattering device of the floor along support rod；
The support rod is rotated into the helical form of multicycle according to certain spiral rate Y, is fixed on the support rod
Floor rotates with camber shape.
Preferably, the support rod is two, the both ends of the floor are individually fixed on two support rods.
Preferably, being provided with several on the floor for reducing the through-hole of floor leeward reflux whirlpool.
Preferably, the through-hole is circular hole.
Preferably, before support rod rotation is spiral, each adjacent floor parallelly distribute on support rod.
Preferably, alternate angle between adjacent floor is 15 °~75 ° before support rod rotation is spiral.
Preferably, each adjacent floor is distributed on support rod at bilateral symmetry before support rod rotation is spiral.
Preferably, spiral rate Y=2~8.
Preferably, the angle between the support rod and the floor is 15 °~75 °.
Another aspect of the present invention provides a kind of disturbed flow pipe, which includes tube body and flow-disturbing as described above member
Part, the turbulent element are longitudinally built in the tube body along tube body, and the turbulent element passes through the helical form knot of its multicycle
Structure and the arc floor being fixed between helicoidal structure, the intracorporal fluid of guiding tube generate multiple longitudinal Vortexes along relay trip.
Compared with prior art, the invention has the benefit that
1) the present invention provides a kind of turbulent elements of helical structure with arc floor, are guided and are flowed by the turbulent element
Body along its flow direction generate multiple longitudinal Vortexes along relay trip, can effectively be homogenized flow field, improve the temperature gradient into wall surface, into
And improve heat transfer efficiency.The present invention is by guiding fluid to generate the large scale mixing of longitudinal Vortex, relatively transverse whirlpool in disturbed flow pipe
Disturbed flow pipe mixed is stronger, and heat transfer efficiency is higher.
2) relatively typical twisted strip, due to the aperture along relay trip and spiral floor of longitudinal Vortex, segment fluid flow passes through circle
Hole is converged with the inclination subsequent fluid of floor, the reflux whirlpool of inclined ribs plate leeward can be significantly reduced, and then reduce body
Resistance, complex heat transfer performance are more preferable.
3) reinforced element is easy to process, and installation is easy, and can be used for the design and legacy heat exchanger of new type heat exchanger
Upgrading can obviously reduce the in-tube fouling of high viscosity fluid simultaneously because it guides fluid to generate vortex.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the restriction to the application for explaining the application.
Fig. 1 is 1 floor front view of the embodiment of the present invention；
Fig. 2 is side view of the embodiment of the present invention 1 before being rotated into helicoidal structure；
Fig. 3 is top view of the embodiment of the present invention 1 before being rotated into helicoidal structure；
Fig. 4 is schematic perspective view of the embodiment of the present invention 1 after being rotated into helicoidal structure；
Fig. 5 is front view of the embodiment of the present invention 1 after being rotated into helicoidal structure；
Fig. 6 is top view of the embodiment of the present invention 1 after being rotated into helicoidal structure；
Fig. 7 is side view of the embodiment of the present invention 2 before being rotated into helicoidal structure；
Fig. 8 is top view of the embodiment of the present invention 2 before being rotated into helicoidal structure；
Fig. 9 is schematic perspective view of the embodiment of the present invention 2 after being rotated into helicoidal structure；
Figure 10 is side view of the embodiment of the present invention 3 before being rotated into helicoidal structure；
Figure 11 is top view of the embodiment of the present invention 3 before being rotated into helicoidal structure；
Figure 12 is schematic perspective view of the embodiment of the present invention 3 after being rotated into helicoidal structure.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
It is mentioned in background technique, for the operating condition of low reynolds number in heat exchanger tube, industrially usually uses displacement apparatus or torsion
The reinforced elements such as band reduce intraductal turbulance critical Reynolds number, and flow regime in pipe is promoted to reach turbulent flow in advance, improve mixed in pipe
Conjunction ability and rate of heat transfer.But in many cases, pipe flow field mixture homogeneity is inadequate, and vortex intensity is lower, frictional resistance
Or form drag is larger, intraductal heat transfer rate promotes limited extent, etc. under power consumptions, complex heat transfer performance is bad.Based on this, to this
The specific embodiment of invention is described in detail:
A kind of turbulent element for reducing turbulent flow critical Reynolds number, including several floors, and for fixing floor
Two support rods being parallel to each other, wherein as shown in Figure 1, the both ends of floor are individually fixed on two support rods, and on floor
It is provided with circular hole, floor is along length direction (i.e. fluid flow direction) dispersed placement of support rod, and under normal circumstances, floor can be put down
Row layout (such as Fig. 2), can also be with crossed geometry (such as Fig. 5).The value range of the height H of floor are as follows: H=3~20mm, floor
The value range of length L are as follows: L=10~40mm, correspondingly, the value range of Circularhole diameter D are as follows: D=2~15mm, floor
A=15 ° of inclination angle~75 ° between longitudinal direction and the longitudinal direction of support rod, the value range of the distance between two neighboring floor P are as follows: P
=10~40mm.In addition, the value range of the diameter d of support rod are as follows: d=2~5mm, the angle of the crossing between adjacent floor are 15 °
~75 °.After floor and support rod are integrally fixed-type, rotated according to spiral rate Y to get spiral helicine turbulent element, this
In it is to be appreciated that spiral rate Y value range are as follows: Y=2~8, spiral rate is defined as: the length S after 360 ° of support rod spiral
The ratio between with the width B (as shown in Figures 5 and 6) of screw rod.
Below with reference to the structure of the embodiment above, the structural parameters assembled scheme of 3 groups of spiral floors is enumerated, for this
Invention is further described below, wherein each embodiment is both needed to combine above structure, and embodiments of the present invention are unlimited
It is all that simple modifications or changes is done to essence of the invention in this, belong to the range of technical solution of the present invention.In addition, in order to
The performance of each embodiment is evaluated, complex heat transfer performance is defined are as follows:
PEC=(Nu/Nu0)/(f/f0)(1/3)；
Wherein, PEC represents complex heat transfer performance i.e. Performance evaluation criterion (performance evaluation
Criterion, PEC), Nu0The dimensionless rate of heat transfer (i.e. nusselt number) of light pipe and enhanced tube, f are respectively represented with Nu0With f points
The dimensionless pressure drop i.e. friction factor for not representing light pipe and enhanced tube, if PEC is greater than 1, illustrates complex heat transfer under power consumption
Can opposite light pipe be improved, it is on the contrary then do not improve.
Embodiment 1
As shown in attached drawing 1 and Fig. 2, the height H=4mm of floor, length L=19mm, plate thickness t=4mm, each floor propped up
It is arranged in parallel on strut, that disperses on floor is provided with 3 circular holes, Circularhole diameter D=2mm, distance A1=3.5mm between circular hole,
Distance A2=3mm between support rod and circular hole, a=60 ° of inclination angle, pitch P=20mm, support shank diameter are d=2mm, spiral ribs
The torsion rate Y=4 of plate.
Its application method are as follows:
Floor is fixed on support rod, spiral is carried out to the support rod for being fixed with floor according to spiral rate Y, to be formed
The turbulent element (such as Fig. 3, Fig. 4, Fig. 5 and Fig. 6) of multicycle spiral.The turbulent element is built in disturbed flow pipe, using spot welding
Method be fixed, easy disassembly.In use, fluid enters from one end of disturbed flow pipe, under the induction of turbulent element, generate
Along the longitudinal Vortex of fluid flow direction, vortex washes away tube wall, drives the mixing of high temperature fluid and cryogen, reduces fast in pipe
Spend the angle between vector and temperature gradient vector, volume weighting averagely cooperate with angle lower than the two in light pipe close to 90 ° of angle,
Cooperateing with for temperature field and velocity field, opposite light pipe are improved, tube fluid displacement intensity greatly improves, and is thinned boundary layer.By
In the periodicity of turbulent element helical structure, longitudinal turbulence is concatenated to form, and is not easy to decay, with lower resistance in each pitch
Between formed collaboration relay, to obtain preferable rate of heat transfer.Under common operating condition, compared with traditional smooth tube, critical thunder
Promise number is lower than 1000, and rate of heat transfer improves 100% or more, and under power consumption, complex heat transfer performance PEC can reach 2 or more.
Embodiment 2
As shown in Figures 7 and 8, the present embodiment place different from embodiment 1 is that layout of the floor on support rod is deposited
In difference, the angle of the crossing of the adjacent floor of streamwise two is 60 °, and the two reversed arrangement, and at bilateral symmetry, support rod is driven
After floor spiral, structure chart is as shown in figure 9, other structures are with embodiment 1, and application method is also the same as embodiment 1.
Embodiment 3
As shown in attached drawing 10, Figure 11 and Figure 12, the plate of floor high H=6mm, length L=25mm, plate thickness t=6mm is adjacent
It is parallel to each other between floor, and is provided with 3 circular holes on floor, the diameter D=3mm of circular hole, distance A1=between adjacent circular holes
3.5mm, distance A2=3mm between support rod and circular hole, a=45 ° of inclination angle, pitch P=20mm, support shank diameter are d=2mm,
The torsion rate Y=4 of spiral floor.Under common operating condition, compared with traditional smooth tube, critical Reynolds number is lower than 1000, heat transfer speed
Rate improves 150% or more, and under power consumption, complex heat transfer performance reaches 2.5 or more, and application method is the same as embodiment 1.
Turbulent element provided by the invention is utilized by the inclination angle of floor and fluid flow direction that spiral is arc, in flow field
Induction generates longitudinal Vortex, then by floor under the fixation of support rod according to certain spiral rate spiral, in the dual of inclination angle and spiral
Under effect, intensity and the influence area of longitudinal Vortex are further increased, fluid is increased substantially with wall region in mainstream core space and sets
Transducing power reinforces fluid particle collision, improves the uniformity coefficient in flow field and temperature field, improve tube wall heat flux.Certainly, should
Turbulent element is not only applicable to circular channel, is also applied for rectangular channel.Due to that turbulent flow critical Reynolds number can be reduced, compared with
Under small flow velocity, so that it may obtain higher turbulivity, therefore the turbulent element is not only applicable to the low Reynolds of high viscosity fluid
Number flowing, is also applied for the low reynolds number flow of low viscosity fluid.By arranging several floors in flow direction and in floor
Upper aperture, active control resistance to not only guarantee big rate of heat transfer under low reynolds number, but also can pay lesser fluid function
Consumption, so that the reinforcing complex heat transfer performance of high-efficiency low-resistance can be obtained on the whole.
It above are only one embodiment of the present of invention, it should be understood by those skilled in the art that, implementation of the invention
Example can provide as method, system or computer program product.Therefore, complete hardware embodiment, complete software can be used in the present invention
The form of embodiment or embodiment combining software and hardware aspects.
In addition, it should be noted that:
" one embodiment " or " embodiment " mentioned in specification means the special characteristic described in conjunction with the embodiments, structure
Or characteristic is included at least one embodiment of the present invention.Therefore, the phrase " reality that specification various places throughout occurs
Apply example " or " embodiment " the same embodiment might not be referred both to.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of turbulent element for reducing turbulent flow critical Reynolds number, which is characterized in that
Including at least two support rod and muti-piece floors disposed in parallel；
The floor is fixed between two adjacent support rods, and is kept at an angle with the support rod, each floor
Along the length direction scattering device of support rod；
The support rod is rotated into the helical form of multicycle, the floor being fixed on the support rod according to certain spiral rate Y
Rotate with camber shape.
2. a kind of turbulent element for reducing turbulent flow critical Reynolds number according to claim 1, which is characterized in that described
Support rod is two, and the both ends of the floor are individually fixed on two support rods.
3. a kind of turbulent element for reducing turbulent flow critical Reynolds number according to claim 2, which is characterized in that described
Several are provided on floor for reducing the through-hole of floor leeward reflux whirlpool.
4. a kind of turbulent element for reducing turbulent flow critical Reynolds number according to claim 3, which is characterized in that described
Through-hole is circular hole.
5. a kind of turbulent element for reducing turbulent flow critical Reynolds number according to claim 3, which is characterized in that propping up
Before strut rotation is spiral, each adjacent floor parallelly distribute on support rod.
6. a kind of turbulent element for reducing turbulent flow critical Reynolds number according to claim 5, which is characterized in that propping up
After strut rotation is spiral, the alternate angle between adjacent floor is 15 °~75 °.
7. a kind of turbulent element for reducing turbulent flow critical Reynolds number according to claim 3, which is characterized in that propping up
Before strut rotation is spiral, each adjacent floor is distributed on support rod at bilateral symmetry.
8. a kind of turbulent element for reducing turbulent flow critical Reynolds number according to claim 1, which is characterized in that described
Spiral rate Y=2~8.
9. a kind of turbulent element for reducing turbulent flow critical Reynolds number according to claim 1, which is characterized in that described
Angle between support rod and the floor is 15 °~75 °.
10. a kind of disturbed flow pipe, which is characterized in that including tube body and turbulent element as claimed in any one of claims 1-9 wherein, institute
It states turbulent element and is longitudinally built in the tube body along tube body, the turbulent element passes through the helicoidal structure of its multicycle and consolidates
Due to the arc floor between helicoidal structure, the intracorporal fluid of guiding tube generate multiple longitudinal Vortexes along relay trip.
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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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Cited By (3)
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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 |
| CN112985156A (en) * | 2021-02-25 | 2021-06-18 | 内蒙古工业大学 | Fluid transposition mixing plug-in unit, fluid transposition mixing plug-in and heat absorption pipe |
| WO2024051490A1 (en) * | 2022-09-05 | 2024-03-14 | 上海飞象健康科技有限公司 | Design method for turbulent flow pipeline structure based on karman vortex street theory |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN112985156A (en) * | 2021-02-25 | 2021-06-18 | 内蒙古工业大学 | Fluid transposition mixing plug-in unit, fluid transposition mixing plug-in and heat absorption pipe |
| 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 |
| WO2024051490A1 (en) * | 2022-09-05 | 2024-03-14 | 上海飞象健康科技有限公司 | Design method for turbulent flow pipeline structure based on karman vortex street theory |
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| CN109612320B (en) | 2023-09-05 |
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