CN105115347B - Flow-guiding plug-in device in heat exchange tube - Google Patents
Flow-guiding plug-in device in heat exchange tube Download PDFInfo
- Publication number
- CN105115347B CN105115347B CN201510448055.3A CN201510448055A CN105115347B CN 105115347 B CN105115347 B CN 105115347B CN 201510448055 A CN201510448055 A CN 201510448055A CN 105115347 B CN105115347 B CN 105115347B
- Authority
- CN
- China
- Prior art keywords
- flow
- heat exchanger
- exchanger tube
- support bar
- plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a flow-guiding plug-in device in a heat exchange tube. The flow-guiding plug-in device comprises plug-in units and a support bar, wherein each plug-in unit comprises a flow-guiding section and two horizontal flow channels, the flow-guiding section is obliquely arranged, and the two horizontal flow channels are respectively arranged at the upper end and the lower end of the flow-guiding section in the horizontal direction to form a stepped structure; the support bar is arranged in the axial direction of the heat exchange tube; each plug-in unit is mounted on the support bar through one horizontal flow channel; and the distance between each plug-in unit and the wall of the heat exchange tube is H, H is larger than 0 and smaller than or equal to 0.15D, and D is the internal diameter of the heat exchange tube. According to the flow-guiding plug-in device in the heat exchange tube, the plug-in units are arranged in a certain mode to generate longitudinal vortices under the action of turbulence, so that the resistance is not increased excessively while heat exchange is improved. The flow-guiding plug-in device in the heat exchange tube is a novel plug-in device which integrates the functions of flow guiding, turbulence and longitudinal vortex generation, and has a favorable heat transfer strengthening capability.
Description
Technical field
The invention belongs to heat exchanger tube flow-disturbing technology and device field, more particularly, to the drainage type in a kind of heat exchanger tube
Insertion apparatus.
Background technology
Tube side heat transfer enhancement technology typically has following two：A kind of is the heat transfer enhancement technology based on surface, such as spiral
The common shape tube such as barrel, shaped telescopic tube, corrugated tube, they are near-wall fluid to be disturbed by different surface textures
Move, and destroy the development of boundary region, reach the purpose of augmentation of heat transfer.Another kind is the heat transfer enhancement technology based on fluid, such as
The common pipe such as twisted strip, scroll bar, spiral winding is inserted into thing, and they are disturbed by self-convection body region so that stream
Body region temperature uniformly reaches the purpose of augmentation of heat transfer as far as possible.Disturbance of the latter to boundary region can be weaker than the former, therefore pressure is damaged
Losing can be smaller, so as to have more preferable augmentation of heat transfer combination property.
The design of traditional insert is generally based on following thinking：While causing strong disturbance, resistance will not mistake
Divide increase.The basic goal of disturbance is to make temperature in pipe more uniform, and so as to reach the purpose of enhanced heat exchange, but insert exists
While greatly improving exchange capability of heat, the cost paid be cause it is larger along journey pressure drop.Thus augmentation of heat transfer is comprehensive
Can be restricted, meanwhile, some inserts have higher reinforcing heat exchange capability in theoretical side, but are difficult in practice
Processing, support, thus range of application is restricted.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides the drainage type insertion in a kind of heat exchanger tube
Device, wherein based on the consideration to flow-disturbing purpose, on the basis of traditional insert, proposing to pass through drainage way, more intuitively
Ground promotes the mixing between different temperatures fluid, so that heat exchanger tube obtains more preferable exchange capability of heat, meanwhile, the insertion
Enter device easy to process, and be easily welded on support bar, be easier in practice to be applied.
For achieving the above object, the present invention proposes the drainage type insertion apparatus in a kind of heat exchanger tube, it is characterised in that bag
Support bar and multiple insert units are included, wherein：
The support bar is located at the inside of heat exchanger tube, and along the axial arranged of the heat exchanger tube；
The insert unit includes Drainage Section and two horizontal runs, and the Drainage Section is obliquely installed, described two levels
Runner is respectively arranged at the upper and lower ends of the Drainage Section in the horizontal direction, and is obtuse angle with the angle of the Drainage Section；Institute
State insert unit to be welded on the support bar by a horizontal run；The insert unit and the heat exchange tube
Spacing between wall is H, wherein, 0 ＜ H≤0.15D, D is the internal diameter of the heat exchanger tube.
As it is further preferred that the insert unit be 24, described in each two, insert unit is symmetricly set on
To form one group of flow-disturbing unit, per group of flow-disturbing unit is arranged along the support bar in in-line arrangement mode for the both sides of the support bar
Cloth.
As it is further preferred that the insert unit be 24, described in each two, insert unit is symmetricly set on
To form one group of flow-disturbing unit, per group of flow-disturbing unit is arranged along the support bar in the row's of pitching mode for the both sides of the support bar
Cloth.
As it is further preferred that the cross sectional shape of the Drainage Section is rectangle, semicircle or circle.
As it is further preferred that the angle of inclination of the Drainage Section is preferably 45 °.
As it is further preferred that the cross sectional shape of the horizontal run is rectangle or circular arc.
In general, possess following compared with prior art, mainly by the contemplated above technical scheme of the present invention
Technological merit：
1. each insert unit is designed to be made up of with horizontal run Drainage Section by the present invention, and wherein Drainage Section is by core
The fluid in stream region is directed near wall, and horizontal run will guide the confines fluid for coming to wash away in near-wall, so as to increase
It is strong to exchange heat.Insert unit is fixed by support bar, is not contacted with the wall of heat exchanger tube, so as to reduce to wall speed edges
The disturbance of layer, flow resistance too will not increase, and heat transfer is obviously improved.
2. the present invention (such as twisted strip) compared with traditional insert, accumulates less with fluid contact level, and flow resistance is little, together
When, the present invention can also form longitudinal Vortex under fork row's arrangement mode, to make it have while enhancing exchange capability of heat, not make resistance
The good flow structure of power too increase.
Description of the drawings
Fig. 1 (a) is insert unit fork row's arrangement mode schematic diagram of the present invention；
Fig. 1 (b) is insert unit in-line arrangement arrangement mode schematic diagram of the present invention；
Fig. 1 (c) is insert Drainage Section of the present invention structural representation；
Fig. 2 is the temperature profile of fork row and different cross section under in-line arrangement arrangement mode；
Fig. 3 is speed vector figure of the fork row's arrangement mode in section z=18mm；
Fig. 4 is speed vector figure of the in-line arrangement arrangement mode in section z=18mm；
Fig. 5 is fork row's longitudinal Vortex of the arrangement mode at the z=18mm of section；
Fig. 6 is fork row's temperature profile of the arrangement mode at the z=18mm of section；
Fig. 7 is the changes of the coefficient of heat transfer Nu with Re of light pipe and different arrangement mode；
Fig. 8 is the changes of the resistance coefficient f with Re of light pipe and different arrangement mode；
Fig. 9 is the change of augmentation of heat transfer comprehensive performance evaluation index PEC with Re of different arrangement modes.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each embodiment
Do not constitute conflict each other can just be mutually combined.
The present invention proposes the drainage type insertion apparatus in a kind of heat exchanger tube, and the drainage type insertion apparatus is installed on heat exchanger tube
In 4, which includes insert unit and support bar 3, wherein：The insert unit includes Drainage Section 1 and two horizontal runs 2, institute
State Drainage Section 1 to be obliquely installed, described two horizontal runs 2 are respectively arranged at the upper and lower ends of the Drainage Section 1 in the horizontal direction,
And be obtuse angle with the angle of the Drainage Section；Along the axial arranged of heat exchanger tube, which is used for welded insert unit to the support bar 3
And support, the insert unit is welded on the support bar 3 by a horizontal run 2, wherein, in insert unit
Drainage Section peak and the pipe wall of heat exchange pipe between spacing be H, suitable H can avoid Drainage Section from being too near to wall
And cause resistance too to increase, while can ensure that horizontal run about beam fluid is washed away strongly to wall, too big H can make
Horizontal run from wall too away from, fluid is not strong enough to the souring of wall, so affect exchange capability of heat raising, this
It is bright to find that, as 0 ＜ H≤0.15D (D is the internal diameter of the heat exchanger tube), its exchange capability of heat is preferable according to test.
The form of above-mentioned Drainage Section can be groove or pipe, and its size, cross sectional shape can also may be used with variation, angle of inclination
To change, cross sectional shape can be rectangle, semicircle, circle or other optimised shapes.The shape of horizontal run can also root with size
It is optimized according to specific heat exchanger tube, can is rectangle, sector etc., its cross sectional shape is rectangle or circular arc etc..For
The equivalent or modification of groove, pipe or horizontal run will also be considered consistent with the principles of the present invention.The insert unit is
Multiple, which selects the quantity of suitable arrangement according to the requirement of exchange capability of heat, the length of work operating mode, arrangement pitch and heat exchanger tube
And arrangement mode is installed along the support bar 3, insert unit can be arranged in in-line arrangement, fork row or other modes
On support bar, and one, two or more insert units in each pitch, can be arranged.
To be described more fully, show the present invention below by a calculated examples, but example will be only explanation
Property effect, specific embodiment of the present invention is not limited by this embodiment.
Embodiment：
The present embodiment using heat exchange bore 18mm, the pipe of length 500mm, entrance it is given reach it is full-blown
The boundary condition of entrance velocity and inlet temperature, wall give 2000W/m2Determine heat-flux conditions, export as free discharge, insertion
Apparatus surface is adiabatic, and horizontal run is 2mm with the distance of tube wall.Using insertion apparatus model as shown in Figure 1, each two insertion
Thing unit is symmetricly set on the both sides of the support bar 3 to form one group of flow-disturbing unit, per the pitch P between two groups of flow-disturbing units
=30mm, according to arrangement pitch and the length of heat exchanger tube, is provided with 12 groups of flow-disturbing units, totally 24 insert units altogether, but
Every group of flow-disturbing unit can also arrange one or two above insert units, its can carry out according to the actual needs select with
Limit, wherein the increasing number of flow-disturbing unit arrangement, exchange capability of heat can be improved, but be will also result in resistance and suitably increased.Per group
Flow-disturbing unit is arranged in each pitch, selects arrangement pitch to be that 30mm can wash away work in previous group flow-disturbing unit generation wall
With and longitudinal Vortex decline after, allow fluid enter next group of flow-disturbing unit so that disturb and wash away but continues recover, flow-disturbing exchange heat imitate
It is really good.The Drainage Section part of insert unit adopt rectangle skewed slot, drain length l=5.6mm, high h=1mm, groove width w=3mm,
X=45 ° of angle of inclination；Horizontal run of this example using rectangle, size a=b=2mm of horizontal run.The material of insertion apparatus
Material thickness be 1mm, the insert unit in flow-disturbing unit according to in-line arrangement, fork row arrangement mode be welded in the square of section 3*3mm
On support bar 3.
Fig. 2 is the comparison to fork row, in-line arrangement arrangement mode temperature field on axially different section.It can be seen that fork row
Can faster cause temperature more uniform.The present embodiment model is -50mm along the starting point of the location parameter z of heat exchanger tube axial direction,
When being observed that z=82mm in figure, there is no high-temperature region in fork row's model at wall, because the distribution form can be faster
The high temperature thermal boundary layer at nearly wall is disturbed, and then make which fade away；Therefore temperature is more uniform than in-line arrangement model, thermal boundary layer is more
It is thin, and in-line arrangement form has two pieces of high-temperature regions at nearly wall, disappearance it is slow, understand according to core flow augmentation of heat transfer is theoretical, fork
The heat exchange of row's model can be more preferable.
Fig. 3, Fig. 4 be fork row, in-line arrangement arrangement mode section z=18mm speed vector figure.Fig. 3, Fig. 4 illustrate drainage type
Insertion apparatus can make fluid under the drainage of Drainage Section, and component velocity in the cross-direction is very big, make fluid to wall
Produce strong washing away.From the temperature field figure of Fig. 2, in two pieces of wall areas by washing away, fluid temperature (F.T.) is than relatively low, temperature
Degree gradient is bigger, and heat exchange property is good.Simultaneously visible by comparing two kinds of arrangement modes, pitching row can be to draw perpendicular to insert
Stream side is upwardly formed multipair longitudinal Vortex, and under the disturbance of this multipair longitudinal Vortex, the boundary region in longitudinal Vortex region is disturbed, hot side
Interlayer is thin, and exchange capability of heat is good.And in-line arrangement mode is having no to form very strong longitudinal Vortex on drain direction, thus do not having
, not as fork row's mode, the interior temperature of pipe is uniform not as fork row's mode for the region Local Heat Transfer ability of insert.
Fig. 5, Fig. 6 respectively illustrate fork longitudinal Vortex and temperature field of row's mode at the z=18mm of section.As above-mentioned point
Analysis, fork row can form obvious multipair longitudinal Vortex, and Fig. 6 more clearly shows at wall, have multipair intensity high longitudinal Vortex,
In the presence of them, the more uniform temperature in these regions, exchange capability of heat are improved.
The heat exchange of this example is with drag characteristic result of calculation as shown in figs. 7-9.Fig. 7 is visible, no matter what arrangement mode,
Drainage type insert can greatly improve the exchange capability of heat of heat exchanger tube, and Nu increases as reynolds number Re increases.By comparing,
The exchange capability of heat of fork row improves 24.2%-37.1% than in-line arrangement, is 4.22-4.87 times of light pipe exchange capability of heat.Fig. 8 explanations
In the case where the in-line arrangement heat exchange of fork parallelism improves 24.2%-37.1%, resistance only improves 6.2%-11.1%.Shown in Fig. 9,
Fork row PEC can 25.1%-32.9% bigger than the PEC of in-line arrangement, illustrate drainage type insert pitch arrange arrangement mode can obtain
More preferable combination property.The PEC of fork row's arrangement mode can reach 1.96-2.09 under simulation Reynolds number, illustrate that drainage type is inserted
Device can effectively lift the combination property of heat exchanger tube under laminar flow operating mode.
In general, the present invention integrates drain, flow-disturbing, produces longitudinal Vortex function, and traditional pipe is only inserted into thing
By it is more therein or 2 points carry out augmentation of heat transfer, the Novel drainage formula insertion apparatus causes Bottomhole pressure and heat transfer with following
Feature：In the presence of Drainage Section, the fluid of core flow is directed into wall, and the fluid mixing of two bursts of different temperatures increased
Heat exchange amount；In Drainage Section end, fluid velocity is very big, and under the constraint of horizontal run, the wall of the part is subject to fluid
Wash away strongly, boundary region is destroyed, Local Heat Transfer ability improve；Under the flow-disturbing of Drainage Section, longitudinal Vortex, longitudinal Vortex are formed
So that the fluid temperature (F.T.) of whirlpool region is evenly, at wall, thermograde becomes big, and Local Heat Transfer ability is improved.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not to
The present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc. are limited, all should be included
Within protection scope of the present invention.
Claims (6)
1. the drainage type insertion apparatus in a kind of heat exchanger tube, it is characterised in that including support bar (3) and multiple insert units,
Wherein：
The support bar (3) located at the inside of heat exchanger tube, and along the axial arranged of the heat exchanger tube；
The insert unit includes Drainage Section (1) and two horizontal runs (2), and the Drainage Section (1) is stereochemical structure and inclination
Arrange, described two horizontal runs (2) are respectively arranged at the upper and lower ends of the Drainage Section (1) in the horizontal direction, and with it is described
The angle of Drainage Section (1) is obtuse angle, is directed to the fluid in heat exchanger tube inner core stream region by the Drainage Section (1) with this
Near heat exchanging pipe wall, the confines fluid for coming will be guided to wash away in near-wall by horizontal run (2), changed so as to strengthen
Heat；The insert unit is welded on the support bar (3) by a horizontal run (2)；The insert unit with it is described
Spacing between pipe wall of heat exchange pipe is H, wherein, 0 ＜ H≤0.15D, D is the internal diameter of the heat exchanger tube.
2. the drainage type insertion apparatus in a kind of heat exchanger tube as claimed in claim 1, it is characterised in that the insert unit
For 24, insert unit described in each two is symmetricly set on the both sides of the support bar (3) to form one group of flow-disturbing unit, often
The group flow-disturbing unit is arranged along the support bar (3) in in-line arrangement mode.
3. the drainage type insertion apparatus in a kind of heat exchanger tube as claimed in claim 1, it is characterised in that the insert unit
For 24, insert unit described in each two is symmetricly set on the both sides of the support bar (3) to form one group of flow-disturbing unit, often
The group flow-disturbing unit is arranged along the support bar (3) in the row's of pitching mode.
4. the drainage type insertion apparatus in a kind of heat exchanger tube as described in any one of claim 1-3, it is characterised in that described to draw
The cross sectional shape of stream section (1) is rectangle, semicircle or circle.
5. the drainage type insertion apparatus in a kind of heat exchanger tube as claimed in claim 4, it is characterised in that the Drainage Section (1)
Angle of inclination be 45 °.
6. the drainage type insertion apparatus in a kind of heat exchanger tube as claimed in claim 5, it is characterised in that the horizontal run
(2) cross sectional shape is rectangle or circular arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510448055.3A CN105115347B (en) | 2015-07-27 | 2015-07-27 | Flow-guiding plug-in device in heat exchange tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510448055.3A CN105115347B (en) | 2015-07-27 | 2015-07-27 | Flow-guiding plug-in device in heat exchange tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105115347A CN105115347A (en) | 2015-12-02 |
| CN105115347B true CN105115347B (en) | 2017-04-12 |
Family
ID=54663392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510448055.3A Active CN105115347B (en) | 2015-07-27 | 2015-07-27 | Flow-guiding plug-in device in heat exchange tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105115347B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352732B (en) * | 2016-08-22 | 2018-12-07 | 华中科技大学 | Plug-in type enhanced heat exchange component and thermoexcell suitable for heat exchanger tube |
| CN106438014B (en) * | 2016-08-26 | 2019-06-18 | 南京航空航天大学 | A kind of internal combustion wave rotor intensified burning apparatus |
| CN108050875B (en) * | 2017-11-14 | 2019-06-07 | 华中科技大学 | A kind of sheet eddy generator insert structure and heat exchanger tube suitable for heat exchanger tube |
| CN108079929B (en) * | 2018-01-31 | 2023-08-15 | 四川普思瑞新材料有限公司 | Resin production system |
| CN113091502A (en) * | 2021-03-18 | 2021-07-09 | 武汉科技大学 | Opposite-penetrating triangular vortex generator |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4352378A (en) * | 1979-07-16 | 1982-10-05 | Transelektro Magyar Villamossagi Kulkereskedelmi Vallalat | Ribbed construction assembled from sheet metal bands for improved heat transfer |
| CN101435673A (en) * | 2008-12-09 | 2009-05-20 | 华中科技大学 | Reinforced heat transfer pipe |
| CN101532797A (en) * | 2009-04-16 | 2009-09-16 | 上海理工大学 | Enhanced heat transfer unit of self-drive periodically brushing boundary layer fracture in heat exchange tube |
| CN101893404A (en) * | 2010-08-06 | 2010-11-24 | 北京化工大学 | Arch static turbulent element in heat exchange pipe |
| CN102494552A (en) * | 2011-12-02 | 2012-06-13 | 北京化工大学 | Hanging component at water inlet end of heat exchange pipe |
| CN103217054A (en) * | 2013-04-27 | 2013-07-24 | 北京化工大学 | Porous screw blade rotor in heat exchange tube |
-
2015
- 2015-07-27 CN CN201510448055.3A patent/CN105115347B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4352378A (en) * | 1979-07-16 | 1982-10-05 | Transelektro Magyar Villamossagi Kulkereskedelmi Vallalat | Ribbed construction assembled from sheet metal bands for improved heat transfer |
| CN101435673A (en) * | 2008-12-09 | 2009-05-20 | 华中科技大学 | Reinforced heat transfer pipe |
| CN101532797A (en) * | 2009-04-16 | 2009-09-16 | 上海理工大学 | Enhanced heat transfer unit of self-drive periodically brushing boundary layer fracture in heat exchange tube |
| CN101893404A (en) * | 2010-08-06 | 2010-11-24 | 北京化工大学 | Arch static turbulent element in heat exchange pipe |
| CN102494552A (en) * | 2011-12-02 | 2012-06-13 | 北京化工大学 | Hanging component at water inlet end of heat exchange pipe |
| CN103217054A (en) * | 2013-04-27 | 2013-07-24 | 北京化工大学 | Porous screw blade rotor in heat exchange tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105115347A (en) | 2015-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105115347B (en) | Flow-guiding plug-in device in heat exchange tube | |
| Skullong et al. | Heat transfer augmentation in a solar air heater channel with combined winglets and wavy grooves on absorber plate | |
| Thianpong et al. | Compound heat transfer enhancement of a dimpled tube with a twisted tape swirl generator | |
| Sheikholeslami et al. | Review of heat transfer enhancement methods: Focus on passive methods using swirl flow devices | |
| Promvonge et al. | Heat transfer augmentation in a helical-ribbed tube with double twisted tape inserts | |
| Khan et al. | Computational simulation of air-side heat transfer and pressure drop performance in staggered mannered twisted oval tube bundle operating in crossflow | |
| Li et al. | Parametric study on heat transfer and pressure drop of twisted oval tube bundle with in line layout | |
| Promvonge | Thermal performance in square-duct heat exchanger with quadruple V-finned twisted tapes | |
| Sarada et al. | Enhancement of heat transfer using varying width twisted tape inserts | |
| He et al. | Air-side heat-transfer enhancement by a new winglet-type vortex generator array in a plain-fin round-tube heat exchanger | |
| Zhang et al. | Influence of geometric parameters on the gas-side heat transfer and pressure drop characteristics of three-dimensional finned tube | |
| Wang et al. | Numerical investigation of a finned-tube heat exchanger with novel longitudinal vortex generators | |
| Wu et al. | Experimental study on the effects of fin pitches and tube diameters on the heat transfer and fluid flow characteristics of a fin punched with curved delta-winglet vortex generators | |
| Chen et al. | Effects of regular triangular prisms on thermal and hydraulic characteristics in a minichannel heat sink | |
| Chang et al. | Heat transfer enhancement by spirally coiled spring inserts with and without segmental solid cords | |
| Li et al. | Thermal-hydraulic characteristics of twisted elliptical tube bundle in staggered arrangement | |
| CN101435673B (en) | Reinforced heat transfer pipe | |
| Huang et al. | Compound thermal performance of an arc-shaped inner finned tube equipped with Y-branch inserts | |
| Luan et al. | Experimental and numerical study of heat transfer and pressure loss in a multi-convergent swirl tube with tangential jets | |
| CN202836267U (en) | Filler coupling coiled duct evaporative type condenser | |
| Abdelmoety et al. | Numerical investigations on optimised shell designs of a U-tube heat exchanger | |
| CN202836266U (en) | High efficient heat exchange duct piece used for filler coupling coiled duct evaporative type condenser | |
| Zhou et al. | Heat transfer and pressure drop performance evaluation of twisted and bent fins when steam flows through the tubes | |
| CN113639578A (en) | To wearing vortex generator and having heat exchange tube to wearing vortex generator | |
| CN102032828B (en) | Fractal surface structure type heat exchange tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |