CN105115347B - Flow-guiding plug-in device in heat exchange tube - Google Patents

Flow-guiding plug-in device in heat exchange tube Download PDF

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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
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flow
heat exchanger
exchanger tube
support bar
plug
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CN105115347A (en
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刘志春
李鹏霄
刘伟
杨金国
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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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

A kind of drainage type insertion apparatus in heat exchanger tube
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.
CN201510448055.3A 2015-07-27 2015-07-27 Flow-guiding plug-in device in heat exchange tube Active CN105115347B (en)

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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

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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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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

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