CN102032828B - Fractal surface structure type heat exchange tube - Google Patents
Fractal surface structure type heat exchange tube Download PDFInfo
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- CN102032828B CN102032828B CN2010105979123A CN201010597912A CN102032828B CN 102032828 B CN102032828 B CN 102032828B CN 2010105979123 A CN2010105979123 A CN 2010105979123A CN 201010597912 A CN201010597912 A CN 201010597912A CN 102032828 B CN102032828 B CN 102032828B
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- fractal
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- heat exchanger
- exchanger tube
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Abstract
The invention discloses a fractal surface structure type heat exchange tube. The fractal surface structure type heat exchange tube comprises a tube shell, a finned surface, a special-shaped turbulent flow body and a connecting piece, wherein the finned surface is spirally arranged on the inner wall of the tube shell along the flowing direction; and the special-shaped turbulent flow body is arranged in the heat exchange tube and is fixed on the tube shell through the connecting piece. The fractal surface structure type heat exchange tube is characterized in that: the finned surface is a surface with a fractal structure characteristic and extends spirally along the flowing direction; the outer surface of the special-shaped turbulent flow body is concavo-convex; and the section shape of the special-shape turbulent flow body is changed periodically along the flowing direction. Due to a Cantor fractal finned surface of the heat exchange tube, the field cooperativity of flowing heat exchange in the tube is greatly improved. Due to the factors, the heat exchange performance of the fractal surface structure type heat exchange tube is greatly improved and the aims of high-efficiency heat exchange, compact structure and energy conservation are fulfilled.
Description
Technical field
The present invention relates to a kind of heat-exchanger rig, what be specifically related to is a kind of heat exchanger tube with THE FRACTAL SURFACE characteristic that designs for enhanced heat exchange.
Background technology
Heat exchanger is widely used in industrial application such as the energy, power, environmental protection, chemical industry.Along with the propelling of industrial energy saving reduction of discharging work, adopt active and effective conservation measures will have important construction value and meaning to each link that relates to energy consumption.The heat exchanging device is optimized design, improves its heat exchanger efficiency, is an important behave of energy-saving and emission-reduction.
Heat exchanger tube is one of critical piece of heat exchanger, and it is optimized design is the important channel of improving heat exchanger effectiveness.Can know that by the collaborative theory in field for fluid interchange, the plain tube design is not the heat exchange mode of optimizing the most.The thermal resistance of heat convection mainly concentrates on bottom, is emphasis so strengthen the heat exchange of bottom, improves in the pipe simultaneously and flows, and increases flow-disturbing in the pipe, is the direction of enhanced heat exchange.At present, the enhanced heat exchange of heat exchanger tube generally is to adopt finned surface designs such as screw thread, ripple to realize.This kind finned surface is the local dip that produces through in the fluid interchange zone, and having improved Hydrodynamic turbulence can intensity, has realized regenerating and having strengthened cold fluid and hot fluid heat transfer coefficient in the passage of heat transfer boundary layer, has improved the heat transfer property of heat exchanger tube.Yet the design of finned surfaces such as existing screw thread, ripple still fails to make full use of the space surface of heat exchanger tube, and, also lack and consider that fluid main flow flow pattern is to heat transmission influence in managing.
For this reason, the present invention becomes to have the fractal structure characteristic making full use of the space surface of heat exchanger tube with the heat exchanger tube surface design, and in pipe, inserts the field concertedness of special-shaped flow-disturbing body with the raising fluid interchange, and then reaches high efficient heat exchanging and purpose of energy saving.
Summary of the invention
Technical problem to be solved by this invention is the deficiency to above-mentioned prior art; Novel has the THE FRACTAL SURFACE characteristic and the heat exchanger tube of the special-shaped flow-disturbing body of insertion in its pipe and provide a kind of; This heat exchanger tube can improve the field concertedness of the fluid interchange in the heat exchanger tube, reaches high efficient heat exchanging and energy-conserving action.
Technical scheme
For solving the technical problem that exists on the heat exchange tube design, the technical scheme that the present invention adopts is:
A kind of THE FRACTAL SURFACE formula heat exchanger tube; Comprise shell, finned surface, special-shaped flow-disturbing body and connector; Be arranged in to the spirality of described finned surface streamwise the inwall of said shell, described special-shaped flow-disturbing body is arranged in heat exchanger tube inside, and described special-shaped flow-disturbing body is fixed on the described shell through described connector; It is characterized in that: described finned surface is the surface with fractal structure characteristic, and streamwise extends twist; Described special-shaped flow-disturbing external surface presents concavo-convex distribution, and its cross sectional shape streamwise is cyclically-varying.
Described finned surface with fractal structure characteristic adopts Cantor collection fractal structure, is furnished with two-stage finned surface structure at least.Consider actual processing request, the fractal progression of described finned surface structure is 2 to 10 grades.Cantor collection fractal structure has from affine topological characteristic, and the generative process of its fractal profile is:
(1) in the horizontal direction, the 0th grade of surface profile is divided into (2
s-1) section (s is protruding hop count) from left to right presses 1,22 with each section
s-1 ordering successively, wherein odd number section and odd number section are isometric, and even number Duan Zeyu even number section is isometric, odd number section length overall
L 1Be the initial surface profile length
L 01/
f x(
f x>1).In vertical direction, even number section height of projection keeps
h 0
(2) above-mentioned each odd number section respectively is divided into (2 once more as stated above
s-1) section, even number section height wherein
h 1Be upper level even number section height of projection
h 01/
f z(
f z>1);
(3) constantly repeat above step, according to the fractal profile that this method generates, its (
n+ 1) level cross-directional length and height of projection are respectively
(1)
Initial geometric height parameter
h 0Can and need the pipeline flow resistance of considering and decide with reference to the thickness of the diameter of heat exchanger tube, shell.Parameter
sFractal dimension with Cantor collection fractal structure
DWith proportionality coefficient
f x , f y Relation below existing:
?(
) (3)
In the formula (3),
f x , f y Be respectively the proportionality coefficient on length direction and the short transverse.
Described flow-disturbing body is axial arranged along heat exchanger tube, through whole heat exchanger tube.The parallel axes of described flow-disturbing body perhaps is in the axial location of heat exchanger tube in the axial location of heat exchanger tube.Described flow-disturbing body is by continuous mutually connection the before and after a plurality of olivas, and the cross sectional shape streamwise is cyclically-varying, and arranges continuous concavo-convex body on its outer surface.The cross sectional shape of described concavo-convex body is triangle, rectangle, arbitrary section shape such as trapezoidal.
Described flow-disturbing body is the periodic section variation of process in pipe; Make the fluid main flow change velocity gradient and thermograde condition current downflow repeatedly; Improved the field harmony of fluid interchange in the pipe; And Secondary Flow that changes of section produces and eddy current also help the thermal boundary layer on skiving heat exchanger tube fin surface, have played the effect of enhanced heat exchange.
The described fractal finned surface of Cantor collection with fractal structure characteristic has made full use of the tube wall surface space, makes and in the confined space, arranges heat exchange surface to greatest extent.And the helical design of the fractal finned surface streamwise of Cantor collection has reduced the fluid velocity vector and the hot-fluid direction vector angle on heat exchanger tube surface, has improved the field concertedness of fluid interchange.The multistage stagger arrangement of peak valley on Cantor fin surface is arranged, has influenced the local flow of fluid at the near wall place, because the minimizing of circulation area makes flow velocity increase, helps strengthening heat convection in cross section, fin peak; Main is that the existence of peak valley has caused regenerating of thermal boundary layer, can promote increasing of local Nu-number greatly, has reached high efficient heat exchanging and energy-conservation purpose.
Described heat exchanger tube can be selected material different according to condition of work, fluid properties etc., can select carbon steel, low-alloy steel, stainless steel, copper (alloy), aluminium (alloy), nickel materials such as (alloys) for use.
A kind of THE FRACTAL SURFACE formula heat exchanger tube provided by the invention, its inner fluid can be fluid working substance arbitrarily such as water, ammonia, ethanol, propyl alcohol, acetone, organic matter, cold-producing medium; Heat exchange mode in the pipe can be forced-convection heat transfer, boiling/condensation phase-change heat-exchange mode.And outer surface can adopt the fractal finned surface of Cantor collection of the same type, and this type heat exchanger tube also can be processed coil pipe, polytype such as snakelike, and concrete shape can be confirmed according to operating mode and service condition, regardless of being which kind of type, can both work normally and efficiently.
Beneficial effect:
A kind of THE FRACTAL SURFACE formula heat exchanger tube that the present invention relates to; This heat exchanger tube inwall has been arranged the fractal finned surface of Cantor collection with fractal structure characteristic twist on streamwise; Made full use of the inner surface of tube wall space, made and in the confined space, arrange heat exchange surface to greatest extent.And the peak valley on Cantor fin surface is multistage stagger arrangement to be arranged, has reduced the fluid velocity vector and the hot-fluid direction vector angle on heat exchanger tube surface, has improved the field concertedness of fluid interchange.In addition; The special-shaped flow-disturbing body that in pipe, inserts; It through periodic section variation, makes the fluid main flow change velocity gradient and thermograde condition current downflow repeatedly in pipe, and Secondary Flow and eddy current that changes of section produces also help the surperficial thermal boundary layer of skiving heat exchanger tube fin.More than these factors strengthened this type exchange performance greatly, and then reach high efficient heat exchanging, compact conformation, purpose of energy saving.
Description of drawings
Fig. 1 THE FRACTAL SURFACE formula heat exchange tube structure sketch map.
Fig. 2 heat exchanger tube part sectioned view of the present invention
The fractal finned surface sketch map of Cantor collection among Fig. 3 the present invention.
The enforceable several kinds of modes of finned surface among Fig. 4 the present invention.
The finned surface partial structurtes sketch map of fractal structure characteristic among Fig. 5 the present invention.
Among the figure, 1. shell; 2. finned surface; 3. concavo-convex body; 4. special-shaped flow-disturbing body; 5. connector
6. the 0th grade of fin; 7. the 1st grade of fin; 8. the 2nd grade of fin; 9. 3rd level fin.
The specific embodiment
Carry out detailed description further below in conjunction with accompanying drawing:
Fig. 1 has provided the structural representation of described THE FRACTAL SURFACE formula heat exchanger tube.A kind of thermoexcell of arranging the fractal finned surface of Kang Tuo (Cantor) collection is made up of shell 1, finned surface 2, special-shaped flow-disturbing body 4 and connector 5.The fractal finned surface 2 of Cantor collection with fractal structure characteristic is arranged along shell 1 inwall.Abnormity flow-disturbing body 4 was fixed on the shell 1 through connector 5, through whole heat exchanger tube by continuous mutually connection the before and after a plurality of olivas.The cross sectional shape streamwise of said special-shaped flow-disturbing body is cyclically-varying, and arranges said continuous concavo-convex body on its outer surface.Because the flow-disturbing body section is periodic variation; Make the fluid main flow change velocity gradient and thermograde condition current downflow repeatedly; Improved the field harmony of fluid interchange in the pipe; And Secondary Flow that changes of section produces and eddy current also help the thermal boundary layer on skiving heat exchanger tube fin surface, have reached high efficient heat exchanging and energy-conservation purpose.
Fig. 2 has provided the part sectioned view of said THE FRACTAL SURFACE formula heat exchanger tube.Fig. 2 (a) is the partial schematic diagram that supports with connector.The cross sectional shape of said concavo-convex body is arbitrary section shapes such as triangle, rectangle, trapezoidal, circle.
(a)-(d) provided the sketch map of the finned surface of fractal dimension D=1.2 from 0 grade to 3 grades generative process among Fig. 3.In the horizontal direction, the 0th grade of surface profile is divided into 5 sections, from left to right by 1,25 ordering successively, wherein odd number section and odd number section are isometric with each section, and even number Duan Zeyu even number section is isometric, in vertical direction, even number section height of projection is kept
h 0Above-mentioned each odd number section respectively is divided into 5 sections once more as stated above, even number section height wherein
h 1Be upper level even number section height of projection
h 01/
f z(
f z>1); Repeat above step once more, according to 3 grades of fractal profiles of this method generation.
Fig. 4 has provided the enforceable several kinds of modes of finned surface of the present invention.Wherein, fractal dimension is 1～2.(a) profile of fractal finned surface during fractal dimension D=1.2; The profile of fractal finned surface when (b) being fractal dimension D=1.5; The profile of fractal finned surface when (c) being fractal dimension D=1.65.
Fig. 5 has provided said finned surface partial structurtes sketch map with fractal structure characteristic.In this embodiment, adopt the fractal finned surface of fractal dimension D=1.2.Owing to utilized the fractal finned surface of Cantor collection of fractal structure characteristic, arranged heat exchange surface to greatest extent in the confined space in the pipe.The fractal finned surface streamwise of Cantor collection has reduced the fluid velocity vector and the hot-fluid direction vector angle on heat exchanger tube surface by helical design, has improved the field concertedness of fluid interchange.
Claims (3)
1. THE FRACTAL SURFACE formula heat exchanger tube; Comprise shell, finned surface, special-shaped flow-disturbing body and connector; Be arranged in to the spirality of described finned surface streamwise the inwall of said shell, described special-shaped flow-disturbing body is arranged in heat exchanger tube inside, and described special-shaped flow-disturbing body is fixed on the described shell through described connector; It is characterized in that: described finned surface is the surface with fractal structure characteristic, and streamwise extends twist; Described special-shaped flow-disturbing external surface presents concavo-convex distribution, and its cross sectional shape streamwise is cyclically-varying; Described flow-disturbing body is continuous mutually being formed by connecting before and after a plurality of olivas; The cross sectional shape streamwise is cyclically-varying; Be furnished with continuous concavo-convex body on its outer surface, the cross sectional shape of described concavo-convex body is the combining structure of triangle, rectangle, trapezoidal, circular or above-mentioned three kinds of shapes.
2. THE FRACTAL SURFACE formula heat exchanger tube according to claim 1 is characterized in that: described finned surface with fractal structure characteristic adopts health holder collection fractal structure, is furnished with two-stage finned surface structure at least.
3. THE FRACTAL SURFACE formula heat exchanger tube according to claim 2 is characterized in that: the fractal dimension of described health holder collection fractal structure is 1～2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105979123A CN102032828B (en) | 2010-12-21 | 2010-12-21 | Fractal surface structure type heat exchange tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105979123A CN102032828B (en) | 2010-12-21 | 2010-12-21 | Fractal surface structure type heat exchange tube |
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| Publication Number | Publication Date |
|---|---|
| CN102032828A CN102032828A (en) | 2011-04-27 |
| CN102032828B true CN102032828B (en) | 2012-05-23 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252540B (en) * | 2011-08-23 | 2013-02-27 | 东南大学 | Heat exchanger of Cantor set fractal structure type |
| CN104457392B (en) * | 2014-09-01 | 2017-07-04 | 无锡特莱姆气体设备有限公司 | A kind of vaporizer with flow-disturbing function |
| CN106643267A (en) * | 2016-12-27 | 2017-05-10 | 苏州博墨热能产品有限公司 | Flue gas disturbed flow pipe |
| CN112177681B (en) * | 2020-09-21 | 2022-03-15 | 西北工业大学 | Fractal intermittent rib structure suitable for internal cooling of turbine blade |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6173763B1 (en) * | 1994-10-28 | 2001-01-16 | Kabushiki Kaisha Toshiba | Heat exchanger tube and method for manufacturing a heat exchanger |
| CN101551214A (en) * | 2008-04-03 | 2009-10-07 | 北京化工大学 | Rotating piece type automatic-cleaning and heat-transfer enhancing device |
| CN201892469U (en) * | 2010-12-21 | 2011-07-06 | 东南大学 | Fractal surface structured heat exchange pipe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040069467A1 (en) * | 2002-06-10 | 2004-04-15 | Petur Thors | Heat transfer tube and method of and tool for manufacturing heat transfer tube having protrusions on inner surface |
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2010
- 2010-12-21 CN CN2010105979123A patent/CN102032828B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6173763B1 (en) * | 1994-10-28 | 2001-01-16 | Kabushiki Kaisha Toshiba | Heat exchanger tube and method for manufacturing a heat exchanger |
| CN101551214A (en) * | 2008-04-03 | 2009-10-07 | 北京化工大学 | Rotating piece type automatic-cleaning and heat-transfer enhancing device |
| CN201892469U (en) * | 2010-12-21 | 2011-07-06 | 东南大学 | Fractal surface structured heat exchange pipe |
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Granted publication date: 20120523 Termination date: 20171221 |