CN105115347A - Flow-guiding plug-in device in heat exchange tube - Google Patents
Flow-guiding plug-in device in heat exchange tube Download PDFInfo
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- CN105115347A CN105115347A CN201510448055.3A CN201510448055A CN105115347A CN 105115347 A CN105115347 A CN 105115347A CN 201510448055 A CN201510448055 A CN 201510448055A CN 105115347 A CN105115347 A CN 105115347A
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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 specifically, relate to the drainage type insertion apparatus in a kind of heat exchanger tube.
Background technology
Tube side heat transfer enhancement technology generally has following two kinds: a kind of is heat transfer enhancement technology based on surface, the shape tube that such as spiral grooved tube, shaped telescopic tube, bellows etc. are common, they carry out disturbance by different surface textures to near-wall fluid, and destroy the development in boundary layer, reach the object of augmentation of heat transfer.Another kind is the heat transfer enhancement technology based on fluid, and insert in the pipe that such as twisted strip, scroll bar, spiral winding etc. are common, they carry out disturbance by self-convection body region, makes fluid mass temperature evenly reach the object of augmentation of heat transfer as far as possible.The latter can be weaker than the former to the disturbance in boundary layer, and therefore the pressure loss can be smaller, thus has better augmentation of heat transfer combination property.
The design of traditional insert is generally based on following thinking: while causing strong disturbance, resistance can not too increase.The basic goal of disturbance to make in pipe temperature more even, thus reach the object of enhanced heat exchange, but insert is while significantly improving exchange capability of heat, the cost paid be cause larger along journey pressure drop.Thus the combination property of augmentation of heat transfer is restricted, and meanwhile, some inserts have higher reinforcing heat exchange capability at theoretical side, but is difficult to processing, support in practice, and thus range of application is restricted.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides the drainage type insertion apparatus in a kind of heat exchanger tube, wherein based on the consideration to flow-disturbing object, on the basis of traditional insert, propose to pass through drainage way, promote the mixing between different temperatures fluid more intuitively, thus make heat exchanger tube obtain more desirable exchange capability of heat, meanwhile, this novel insertion apparatus is easy to processing, and be easily welded on support bar, be more easily applied in practice.
For achieving the above object, the present invention proposes the drainage type insertion apparatus in a kind of heat exchanger tube, it is characterized in that, comprise support bar and multiple insert unit, wherein:
This support bar is located at the inside of heat exchanger tube, and axial arranged along described heat exchanger tube;
This insert unit comprises Drainage Section and two horizontal run, and described Drainage Section is obliquely installed, and described two horizontal run are arranged at the two ends up and down of described Drainage Section in the horizontal direction respectively, and are obtuse angle with the angle of described Drainage Section; Described insert unit is welded on described support bar by a described horizontal run; Spacing between described insert unit and described pipe wall of heat exchange pipe is H, and wherein, 0 < H≤0.15D, D are the internal diameter of described heat exchanger tube.
As preferred further, described insert unit is 24, and every two described insert unit are symmetricly set on the both sides of described support bar to form one group of flow-disturbing unit, often organize described flow-disturbing unit and arrange in in-line arrangement mode along described support bar.
As preferred further, described insert unit is 24, and every two described insert unit are symmetricly set on the both sides of described support bar to form one group of flow-disturbing unit, often organize described flow-disturbing unit and arrange to pitch row's mode along described support bar.
As preferred further, the cross sectional shape of described Drainage Section is rectangle, semicircle or circular.
As preferred further, the angle of inclination of described Drainage Section is preferably 45 °.
As preferred further, the cross sectional shape of described horizontal run is rectangle or circular arc.
In general, the above technical scheme conceived by the present invention compared with prior art, mainly possesses following technological merit:
1. each insert Unit Design becomes to be made up of Drainage Section and horizontal run by the present invention, and wherein the fluid in core flow region is directed near wall by Drainage Section, and horizontal run is washed away guiding the confines fluid of coming at near-wall, thus strengthens heat exchange.Insert unit is fixed by support bar, does not contact with the wall of heat exchanger tube, thus reduces the disturbance to wall velocity boundary layer, and flow resistance can not too increase, and heat transfer obtains obvious lifting.
2. the present invention's (such as twisted strip) compared with traditional insert, less with fluid contact area, flow resistance is little, simultaneously, the present invention can also form longitudinal Vortex under fork row arrangement mode, while making it have enhancing exchange capability of heat, do not make the good flow structure that resistance too increases.
Accompanying drawing explanation
Fig. 1 (a) is insert unit of the present invention fork row arrangement mode schematic diagram;
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 that the temperature profile with different cross section under in-line arrangement arrangement mode arranged by fork;
Fig. 3 is the speed vector figure of fork row arrangement mode at cross section z=18mm;
Fig. 4 is the speed vector figure of in-line arrangement arrangement mode at cross section z=18mm;
Fig. 5 is the longitudinal Vortex of fork row's arrangement mode at z=18mm place, cross section;
Fig. 6 is the temperature profile of fork row's arrangement mode at z=18mm place, cross section;
Fig. 7 is the change of coefficient of heat transfer Nu with Re of light pipe and different arrangement mode;
Fig. 8 is the change of 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 mode.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The present invention proposes the drainage type insertion apparatus in a kind of heat exchanger tube, this drainage type insertion apparatus is installed in heat exchanger tube 4, it comprises insert unit and support bar 3, wherein: this insert unit comprises Drainage Section 1 and two horizontal run 2, described Drainage Section 1 is obliquely installed, described two horizontal run 2 are arranged at the two ends up and down of described Drainage Section 1 in the horizontal direction respectively, and are obtuse angle with the angle of described Drainage Section, axial arranged along heat exchanger tube of this support bar 3, it is used for welded insert unit and support, described insert unit is welded on described support bar 3 by a described horizontal run 2, wherein, spacing between the peak of the Drainage Section in insert unit and described pipe wall of heat exchange pipe is H, suitable H can avoid Drainage Section be too near to wall and cause resistance too to increase, can ensure that horizontal run constrain fluids is washed away strongly to wall simultaneously, too large H can make horizontal run from wall too away from, fluid is strong not to the souring of wall, and then affect the raising of exchange capability of heat, the present invention finds according to test, as 0 < H≤0.15D (D is the internal diameter of described heat exchanger tube), its exchange capability of heat is better.
The form of above-mentioned Drainage Section can be groove or pipe, and its size, cross sectional shape can be diversified, and angle of inclination also can change, and cross sectional shape can be rectangle, semicircle, circle or other optimised shape.The shape of horizontal run and size also can be optimized according to concrete heat exchanger tube, and can be rectangle, fan-shaped etc., its cross sectional shape be rectangle or circular arc etc.For groove, pipe or horizontal run equivalence or amendment also will be regarded as consistent with principle of the present invention.Described insert unit is multiple, its requirement according to exchange capability of heat, work operating mode, arrangement pitch and the length of heat exchanger tube select the quantity of suitable arrangement and arrangement mode to install along described support bar 3, insert unit can be arranged on support bar with in-line arrangement, fork row or other modes, and each pitch can be arranged one, two or more insert unit.
To be described in further detail, be shown the present invention by a calculated examples below, but example is only illustrative effect, specific embodiment of the present invention is not limited by this embodiment.
Embodiment:
The present embodiment adopts the pipe of heat exchanger tube internal diameter 18mm, length 500mm, at the given boundary condition reaching full-blown entrance velocity and inlet temperature of import department, and the given 2000W/m of wall
2determine heat-flux conditions, export as free discharge, insertion apparatus surface is adiabatic, and the distance of horizontal run and tube wall is 2mm.Adopt insertion apparatus model as shown in Figure 1, every two insert unit are symmetricly set on the both sides of described support bar 3 to form one group of flow-disturbing unit, pitch P=30mm between every two groups of flow-disturbing unit, according to the length of arrange pitch and heat exchanger tube, be provided with 12 groups of flow-disturbing unit altogether, totally 24 insert unit, but often group flow-disturbing unit also can arrange one or two above insert unit, it can carry out according to the actual needs selecting and limit, the wherein increasing number of flow-disturbing cell layout, exchange capability of heat can be improved, but resistance also can be caused suitably to increase.Often organizing flow-disturbing unit is arranged in each pitch, arrangement pitch is selected to be that 30mm can after last group of flow-disturbing unit produces wall souring and longitudinal Vortex decline, allow fluid enter next group flow-disturbing unit, make disturbance and wash away and continue to recover, flow-disturbing good effect of heat exchange.The Drainage Section part of insert unit adopts rectangle skewed slot, drainage length l=5.6mm, high h=1mm, groove width w=3mm, angle of inclination x=45 °; This example adopts the horizontal run of rectangle, the size a=b=2mm of horizontal run.The material thickness of insertion apparatus is 1mm, and the insert unit in flow-disturbing unit is welded on the quadrate support bar 3 of cross section 3*3mm according to the arrangement mode of in-line arrangement, fork row.
Fig. 2 is the comparison to fork row, in-line arrangement arrangement mode temperature field on axially different cross section.As seen from the figure, pitching row can make temperature more even sooner.The present embodiment model is-50mm along the starting point of the location parameter z of heat exchanger tube axis, when can observe z=82mm in the drawings, high-temperature region is there is not, because this distribution form can faster to the high-temperature hot boundary layer perturbation at nearly wall place, and then make it fade away in fork row model at wall place; Therefore temperature is more even than in-line arrangement model, thermal boundary layer is thinner, and in-line arrangement form has two pieces of high-temperature regions at nearly wall place, disappearance slow, and according to core flow augmentation of heat transfer theory, the heat exchange of fork row model can be better.
Fig. 3, Fig. 4 are that fork row, in-line arrangement arrangement mode are at the speed vector figure of cross section z=18mm.Fig. 3, Fig. 4 illustrate that drainage type insertion apparatus can make fluid under the drainage of Drainage Section, and component velocity is in the cross-direction very large, make fluid produce strong washing away to wall.From the temperature field pattern of Fig. 2, the two pieces of wall area washed away, fluid temperature (F.T.) is lower, and thermograde is larger, and heat exchange property is good.Simultaneously visible by comparing two kinds of arrangement modes, fork row can also forming multipair longitudinal Vortex perpendicular on insert drainage direction, and under the disturbance of this multipair longitudinal Vortex, the boundary layer in longitudinal Vortex region is disturbed, and thermal boundary layer is thin, and exchange capability of heat is good.And in-line arrangement mode is perpendicular to drainage direction there is no the very strong longitudinal Vortex of formation, thus do not having the region Local Heat Transfer ability of insert not as fork row mode, in pipe, temperature is even not as fork row mode.
Fig. 5, Fig. 6 respectively illustrate the longitudinal Vortex of fork row mode at z=18mm place, cross section and temperature field.As above-mentioned analysis, fork row can form obvious multipair longitudinal Vortex, and Fig. 6 more clearly shows to have at wall place the longitudinal Vortex that multipair intensity is high, and under their effect, the more uniform temperature in these regions, exchange capability of heat improves.
The heat exchange of this example and drag characteristic result of calculation are as shown in figs. 7-9.Fig. 7 is visible, no matter what arrangement mode, drainage type insert all significantly can improve the exchange capability of heat of heat exchanger tube, and Nu all increases along with reynolds number Re and increases.By comparing, the exchange capability of heat of fork row improves 24.2%-37.1% than in-line arrangement, be the 4.22-4.87 of light pipe exchange capability of heat doubly.Fig. 8 illustrates that resistance only improves 6.2%-11.1% when pitching the heat exchange of parallelism in-line arrangement and improve 24.2%-37.1%.Shown in Fig. 9, the PEC of fork row can 25.1%-32.9% larger than the PEC of in-line arrangement, illustrates that drainage type insert is pitched and arranges arrangement mode and can obtain better combination property.The PEC of fork row arrangement mode can reach 1.96-2.09 under simulation Reynolds number, illustrates that drainage type insertion apparatus effectively can promote the combination property of heat exchanger tube under laminar flow operating mode.
In general, the present invention integrates drainage, flow-disturbing, generation longitudinal Vortex function, and insert only carrys out augmentation of heat transfer by wherein any or at 2 in traditional pipe, this Novel drainage formula insertion apparatus makes Bottomhole pressure and heat transfer have following characteristics: under the effect of Drainage Section, the fluid of core flow is directed into wall, the fluid chemical field of two bursts of different temperatures, adds heat exchange amount; At Drainage Section end, fluid velocity is very large, and under the constraint of horizontal run, the wall of this part is subject to strongly washing away of fluid, and boundary layer is destroyed, and Local Heat Transfer ability improves; Under the flow-disturbing of Drainage Section, form longitudinal Vortex, longitudinal Vortex make region, whirlpool fluid temperature (F.T.) evenly, wall place thermograde becomes large, and Local Heat Transfer ability improves.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the drainage type insertion apparatus in heat exchanger tube, is characterized in that, comprises support bar (3) and multiple insert unit, wherein:
This support bar (3) is located at the inside of heat exchanger tube, and axial arranged along described heat exchanger tube;
This insert unit comprises Drainage Section (1) and two horizontal run (2), described Drainage Section (1) is obliquely installed, described two horizontal run (2) are arranged at the two ends up and down of described Drainage Section (1) in the horizontal direction respectively, and are obtuse angle with the angle of described Drainage Section (1); Described insert unit is welded on described support bar (3) by a described horizontal run (2); Spacing between described insert unit and described pipe wall of heat exchange pipe is H, and wherein, 0 < H≤0.15D, D are the internal diameter of described heat exchanger tube.
2. the drainage type insertion apparatus in a kind of heat exchanger tube as claimed in claim 1, it is characterized in that, described insert unit is 24, every two described insert unit are symmetricly set on the both sides of described support bar (3) to form one group of flow-disturbing unit, often organize described flow-disturbing unit and arrange in in-line arrangement mode along described support bar (3).
3. the drainage type insertion apparatus in a kind of heat exchanger tube as claimed in claim 1, it is characterized in that, described insert unit is 24, every two described insert unit are symmetricly set on the both sides of described support bar (3) to form one group of flow-disturbing unit, often organize described flow-disturbing unit and arrange in the row's of pitching mode along described support bar (3).
4. the drainage type insertion apparatus in a kind of heat exchanger tube as described in any one of claim 1-3, is characterized in that, the cross sectional shape of described Drainage Section (1) is rectangle, semicircle or circular.
5. the drainage type insertion apparatus in a kind of heat exchanger tube as claimed in claim 4, is characterized in that, the angle of inclination of described Drainage Section (1) is preferably 45 °.
6. the drainage type insertion apparatus in a kind of heat exchanger tube as claimed in claim 5, is characterized in that, the cross sectional shape of described horizontal run (2) is rectangle or circular arc.
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| CN201510448055.3A CN105115347B (en) | 2015-07-27 | 2015-07-27 | Flow-guiding plug-in device in heat exchange tube |
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| CN201510448055.3A CN105115347B (en) | 2015-07-27 | 2015-07-27 | Flow-guiding plug-in device in heat exchange tube |
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| CN105115347B CN105115347B (en) | 2017-04-12 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352732A (en) * | 2016-08-22 | 2017-01-25 | 华中科技大学 | Plug-in heat exchange enhancement assembly suitable for heat exchange tube and enhanced heat exchange tube |
| CN106438014A (en) * | 2016-08-26 | 2017-02-22 | 南京航空航天大学 | Intensified combustion device for internal combustion wave rotor |
| CN108050875A (en) * | 2017-11-14 | 2018-05-18 | 华中科技大学 | A kind of sheet eddy generator insert structure and heat exchanger tube suitable for heat exchanger tube |
| CN108079929A (en) * | 2018-01-31 | 2018-05-29 | 四川普思瑞新材料有限公司 | A kind of production of resins system |
| CN113639578A (en) * | 2021-03-18 | 2021-11-12 | 武汉科技大学 | To wearing vortex generator and having heat exchange tube to wearing 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 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352732A (en) * | 2016-08-22 | 2017-01-25 | 华中科技大学 | Plug-in heat exchange enhancement assembly suitable for heat exchange tube and enhanced heat exchange tube |
| CN106438014A (en) * | 2016-08-26 | 2017-02-22 | 南京航空航天大学 | Intensified combustion device for internal combustion wave rotor |
| 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 |
| CN108050875A (en) * | 2017-11-14 | 2018-05-18 | 华中科技大学 | A kind of sheet eddy generator insert structure and heat exchanger tube suitable for heat exchanger tube |
| CN108079929A (en) * | 2018-01-31 | 2018-05-29 | 四川普思瑞新材料有限公司 | A kind of production of resins system |
| CN108079929B (en) * | 2018-01-31 | 2023-08-15 | 四川普思瑞新材料有限公司 | Resin production system |
| CN113639578A (en) * | 2021-03-18 | 2021-11-12 | 武汉科技大学 | To wearing vortex generator and having heat exchange tube to wearing vortex generator |
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