CN102636073B - Heat transfer element capable of generating longitudinal vortex and element pair thereof - Google Patents
Heat transfer element capable of generating longitudinal vortex and element pair thereof Download PDFInfo
- Publication number
- CN102636073B CN102636073B CN 201210116950 CN201210116950A CN102636073B CN 102636073 B CN102636073 B CN 102636073B CN 201210116950 CN201210116950 CN 201210116950 CN 201210116950 A CN201210116950 A CN 201210116950A CN 102636073 B CN102636073 B CN 102636073B
- Authority
- CN
- China
- Prior art keywords
- heat exchange
- rib
- heat transfer
- mentioned
- main shaft
- 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
Images
Abstract
The invention relates a heat transfer element capable of generating longitudinal vortex and an element pair thereof, and belongs to the field of strengthened heat transfer. The element is composed of a rib and a heat exchange surface, wherein the shape of the rib is a spiral cylinder with a square section; the element is obtained through the following manners that a straight line at the initial square center is a main axis, and one point outside the main axis rotates by an angle alpha clockwise around the main axis and advances for a length L along the main axis to obtain a spiral line, and the semidiameter of the spiral line is r; the initial square perpendicularly stretches by the length L so as to obtain a spiral cylinder; and the longitudinal vortex generated by the element has good quality; and compared with a discontinuous crossed rib, the heat transfer effect and the strengthened heat transfer property with same consumption are obviously improved.
Description
Technical field
It is right to the present invention relates to a kind of heat exchange element and element thereof that can produce vertical whirlpool, belongs to the enhanced heat exchange technical field.
Background technology
Since entering 21st century, energy problem has become the bottleneck of restriction China economic development.The energy consumption of China's industrial products is but far above industrially developed country, thus improve energy utilization rate and energy-conservation be the effective way that solves China energy problem.The using energy source of the overwhelming majority all realizes by heat energy and various heat exchanger, and augmentation of heat transfer can improve hot property, the reduction heat transfer temperature difference of heat-transfer equipment and reduce the pump power consumption, so augmentation of heat transfer plays a key effect for energy-conservation and raising energy utilization rate.
Different according to object and condition, people have researched and developed various augmentation of heat transfer technology, and wherein longitudinal whorl strengthened heat transfer technology is exactly wherein a kind of.When fluid crossed certain barrier, tend to circle round in the backside space generation of barrier, these vortexs are both advantageous and disadvantageous.If the lateral dimension of barrier is limited, and intersect suitable angle with the fluid of incoming flow, then the vortex of Chan Shenging will can not be stranded in a certain space, and can travel forward with main flow, thereby form a series of orderly longitudinal shrinking turbulence, i.e. vertical whirlpool.The strong movements of these longitudinal shrinking turbulences has promoted the momentum between near the fluid main flow area and the heat transfer wall and the exchange of energy, and strong disturbance is played the boundary layer and weakened or destruction, thereby makes to conduct heat and strengthen.In a word, adopting the heat conduction reinforced technology in vertical whirlpool, is a kind of approach of heat transfer efficiency of more effective raising heat exchanger.
There are a lot of Chinese scholars to carry out the research of longitudinal whorl strengthened heat transfer technology in recent years, Li Xiaowei has mentioned a kind of novel discontinuous cross-rib plate in its thesis for the doctorate, its numerical analysis and FLOW VISUALIZATION experiment show, produced between this fin plate and comprised vertically a series of vertical whirlpools such as whirlpool and main vertical whirlpool of preceding vertically whirlpool, back, disclosed the physical mechanism of its enhanced heat exchange, strengthened more than 25% with the power consumption heat exchange than herringbone plate commonly used at present.He also analyzes the influence of mobile and heat exchange the rib parameter with numerical computations and FLOW VISUALIZATION experimental technique, has provided the optimum structure parameter of discontinuous cross-rib plate.
Can analyze through above, this diagonal ribs is easy to process, can produce high-quality longitudinal shrinking turbulence, and the enhanced heat exchange effect is relatively good, be a kind of advanced longitudinal whorl strengthened heat exchange turbulent element at present, yet it still have the significantly rising space with power consumption heat exchange index.All have such problem in the process of most of augmentation of heat transfers: the heat exchange effect is good more, and the pressure loss is just big more, and it also is like this adopting the heat conduction reinforced technology in vertical whirlpool.It is less how when improving the coefficient of heat transfer pressure loss to be increased, and promptly improves it with power consumption enhanced heat exchange index, is the key that improves the heat exchanger overall efficiency.This shows, be necessary to propose a kind of new longitudinal shrinking turbulence and produce unit, the geometric shape of this element can be improved on the basis of discontinuous right-angled intersection rib, and the heat exchange effect will be significantly better than traditional discontinuous diagonal ribs, and also will significantly improve with the power consumption heat exchange property.
Summary of the invention
The objective of the invention is to propose a kind of new longitudinal shrinking turbulence turbulent element, the quality of the longitudinal shrinking turbulence that this element produced will be got well, and compares heat exchange effect and all obviously improve with power consumption enhanced heat exchange performance with discontinuous diagonal ribs.
This element is a kind of element that is used for enhanced heat exchange that can produce vertical whirlpool, the helical form cylinder that is shaped as square sectional of this element.If crossing the straight line at initial square center is main shaft, main shaft is outer a bit around this main shaft anglec of rotation α and obtain a helix along the main shaft length L of advancing at the uniform velocity clockwise, and the helix radius is r; Above-mentioned initial square along this helix quadrature tensile elongation L, can be obtained the spiral cylinder; Above-mentioned helix promptly is the axis of spiral cylinder.The parameter effective range of this heat exchange element be α/L within 10～60, unit is degree/mm, the square when set to stretch stopping is with initial square identical, then α must be 90 ° integral multiple; The height that rib protrudes heat exchange surface and the ratio e of rib height are within 0.25～1; Above-mentioned rib comes flow path direction to become angle of attack β in 0 °～90 ° scopes with fluid.Above-mentioned heat exchange element is raised in heat exchange surface inside, and heat exchange surface is parallel with above-mentioned main shaft.
Right according to the described formed element of enhanced heat exchange element that can produce vertical whirlpool, it is characterized in that: it is made up of two enhanced heat exchange elements that overlap up and down, and integral form is the right-angled intersection formula.
The general effect of new enhanced heat exchange element will significantly be better than traditional straight rib, in effective α/L, e, β, is 30%～40% with power consumption enhanced heat exchange index raising scope.The heat exchange effect and the pressure loss situation of novel reinforced heat exchange element are as follows: α/L is within 10～60, unit is degree/mm, square sectional when stopping for guaranteeing to rotate resets with initial square, α is 90 ° a integral multiple, under the same flow velocity with the increase of α/L, the pressure loss of skimming over fluid behind this rib reduces and coefficient of heat transfer fluctuation is little, so increase with power consumption enhanced heat exchange index; Leap ahead rate is more little more for α/L, and when α/L was 60, growth trend was bordering on level.The actual parameter scope of projection ratio e is 0.25 to 1, increases with e in the actual parameter scope, and the pressure loss increases rapidly; the coefficient of heat transfer also slightly increases, and e is more little, and is high more with power consumption enhanced heat exchange index; e increases very slow less than after 0.25 with power consumption enhanced heat exchange index.Effectively the β parameter area is 0～90 °, increases with β, and coefficient of heat transfer fluctuation is less, and the pressure loss increases, and especially sharply increases after β surpasses 30 °; During β=30 ° with power consumption enhanced heat exchange desired value optimum.
After fluid skimmed over this novel heat exchange element, velocity attitude rotated skew, has caused secondary flow; Based on the spinning behaviour of this heat exchange element, and longitudinal shrinking turbulence not of uniform size has appearred.The strong movements of these longitudinal shrinking turbulences, destroy and skiving thermal boundary layer and velocity boundary layer, strengthened momentum and energy exchange between main flow area and the Boundary-Layer Zone fluid, improved the velocity field of heat convection and the collaborative degree of heat flow field, so the heat exchange effect obviously improves.
Description of drawings
Fig. 1 is that the spiral cylinder generates schematic diagram;
Fig. 2 is single wall surface helix cylinder geometry figure;
Fig. 3 is the spiral ribs vertical view after the right-angled intersection;
Fig. 4 is that spiral ribs after the right-angled intersection is to the placement schematic diagram in rectangular channel.
The number in the figure title: 1. the original stretching of rib cross section, 2. helix, 3. spiral ribs, 4. dull and stereotyped heat exchange surface, 5. rectangular channel, 6. spiral ribs is right, 7. fluid inlet, 8. fluid issuing.
The specific embodiment
With reference to accompanying drawing 1, describe the structure thinking of single-screw rib in detail.Square [1] is stretched as a spiral helicine cylinder [3] along this helix [2] quadrature.Helix by axis outer a bit with this straight line be the axle center clockwise at the uniform velocity the anglec of rotation α rib length L of advancing obtain.Under the condition of L=9mm, effectively alpha parameter is 90 °, 180 °, 270 °, 360 °, 450 °, 540 °.Increase with α under the same flow velocity, fluid skims over behind this rib that the pressure loss reduces and coefficient of heat transfer fluctuation is little, so increase with power consumption enhanced heat exchange index; Leap ahead rate is more little more for α, and when α was 540 °, growth trend was bordering on level; α=540 ° have increased 8% with power consumption enhanced heat exchange index during than α=90 °.
With reference to accompanying drawing 2, describe the geometric shape and the placement location on heat exchange surface [4] of single-screw rib [3] in detail.Rib is raised in heat exchange surface, and fin and fluid come flow path direction β at an angle, is 0 ° when coming flow path direction consistent with fin and fluid, and heat exchange surface is rotated counterclockwise at the rib place.Effectively the β parameter area is 0 ~ 90 °, increases with β, and coefficient of heat transfer fluctuation is less, and the pressure loss increases, and especially sharply increases after β surpasses 30 °; Best with power consumption enhanced heat exchange index during the β=30 ° of back as calculated.The actual parameter scope of projection ratio e is 0.25 to 1, increases with e, and the pressure loss increases, and the coefficient of heat transfer also slightly increases, and e is more little, and is high more with power consumption enhanced heat exchange index.
With reference to accompanying drawing 3, describe the up and down plan view from above during the stagger arrangement right-angled intersection of two novel reinforced heat exchange elements in detail.Two spiral ribs stagger arrangement right-angled intersections up and down, incline direction is opposite, embeds upper and lower heat exchange inner surface respectively.
With reference to accompanying drawing 4, describe in detail can produce vertical whirlpool spiral ribs to [6].Through to the flow field analysis of single rib, as can be known, fluid skims over the velocity that has produced behind single rib perpendicular to wall, can produce the vortex greater than 180 °.After two novel ribs are right-angled intersection, can produce continuous go-ahead longitudinal shrinking turbulence.This spiral ribs is opposite in the rectangular channel [5], and fluid flows into [7] from the left side, skims over this rib [8] are flowed out by the right side in the back.When fluid flow through this spiral ribs to after, produce the axle center vortex consistent with fluid flow direction, flow field and the formed flow field of discontinuous right-angled intersection rib are similar, but more complicated, are comprising little whirlpool in the Maelstrom, and can have influence on very wide zone, downstream.This novel heat exchange element rib pair is compared with the straight rib of the discontinuous right-angled intersection of tradition, and the pressure loss has improved 35.3%, and the coefficient of heat transfer has improved 29.4%, has improved 17% with power consumption enhanced heat exchange index.
Claims (2)
1. enhanced heat exchange element that can produce vertical whirlpool is characterized in that:
Form by rib and heat exchange surface;
The helical form cylinder that is shaped as square sectional of above-mentioned rib, it is to obtain in the following manner: the straight line of establishing initial square center is a main shaft, main shaft is outer a bit around this main shaft anglec of rotation α and obtain a helix along the main shaft length L of advancing at the uniform velocity clockwise, and the helix radius is r; Above-mentioned initial square along this helix quadrature tensile elongation L, can be obtained a spiral cylinder; Helix is the axis of spiral cylinder; Above-mentioned α is 90 ° a integral multiple, and α/L is within 10～60, and unit is degree/mm;
Above-mentioned rib is embedded in the described heat exchange surface, and heat exchange surface is parallel with above-mentioned main shaft; The height of above-mentioned rib protrusion heat exchange surface and the ratio e of rib height are between 0.25～1; Above-mentioned rib comes flow path direction to become angle of attack β in 0 °～90 ° scopes with fluid.
2. the formed element of enhanced heat exchange element that can produce vertical whirlpool according to claim 1 is right, it is characterized in that: it is made up of two enhanced heat exchange elements that overlap up and down, and integral form is the right-angled intersection formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210116950 CN102636073B (en) | 2012-04-20 | 2012-04-20 | Heat transfer element capable of generating longitudinal vortex and element pair thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210116950 CN102636073B (en) | 2012-04-20 | 2012-04-20 | Heat transfer element capable of generating longitudinal vortex and element pair thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102636073A CN102636073A (en) | 2012-08-15 |
| CN102636073B true CN102636073B (en) | 2013-07-24 |
Family
ID=46620564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210116950 Active CN102636073B (en) | 2012-04-20 | 2012-04-20 | Heat transfer element capable of generating longitudinal vortex and element pair thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102636073B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3394736A (en) * | 1966-02-21 | 1968-07-30 | Acme Ind Inc | Internal finned tube |
| CN1636128A (en) * | 2002-03-12 | 2005-07-06 | 特雷菲梅特奥克斯公司 | Slotted tube with reversible usage for heat exchangers |
| CN101532798A (en) * | 2009-03-31 | 2009-09-16 | 华北电力大学 | Reinforced heat transfer element of truncated cylindrical surface wing type vortex generator |
| CN102095332A (en) * | 2011-02-24 | 2011-06-15 | 华东理工大学 | Heat exchange tube internally provided with spiral fins and application thereof |
| CN202547480U (en) * | 2012-04-20 | 2012-11-21 | 南京航空航天大学 | Heat exchange element capable of generating longitudinal vortex and element pair thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009053579A1 (en) * | 2009-11-17 | 2011-05-19 | Arup Alu-Rohr Und Profil Gmbh | Flat tube with turbulence insert for a heat exchanger, heat exchanger with such flat tubes, and method and apparatus for producing such a flat tube |
-
2012
- 2012-04-20 CN CN 201210116950 patent/CN102636073B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3394736A (en) * | 1966-02-21 | 1968-07-30 | Acme Ind Inc | Internal finned tube |
| CN1636128A (en) * | 2002-03-12 | 2005-07-06 | 特雷菲梅特奥克斯公司 | Slotted tube with reversible usage for heat exchangers |
| CN101532798A (en) * | 2009-03-31 | 2009-09-16 | 华北电力大学 | Reinforced heat transfer element of truncated cylindrical surface wing type vortex generator |
| CN102095332A (en) * | 2011-02-24 | 2011-06-15 | 华东理工大学 | Heat exchange tube internally provided with spiral fins and application thereof |
| CN202547480U (en) * | 2012-04-20 | 2012-11-21 | 南京航空航天大学 | Heat exchange element capable of generating longitudinal vortex and element pair thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102636073A (en) | 2012-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101245974A (en) | Finned heat exchanger | |
| CN204346219U (en) | A kind of heat exchange jackets | |
| CN202547480U (en) | Heat exchange element capable of generating longitudinal vortex and element pair thereof | |
| CN206269336U (en) | A kind of air conditioner air deflector | |
| CN102636073B (en) | Heat transfer element capable of generating longitudinal vortex and element pair thereof | |
| CN104142084B (en) | A kind of heat exchanger for power station 1,000,000 unit indirect air cooling system | |
| CN203349680U (en) | Double-shell side shell-and-tube heat exchanger | |
| CN205119854U (en) | Cooling air flow field guiding device in air cooling condenser unit | |
| CN203534300U (en) | Gravity assisted heat pipe with spiral groove | |
| CN207439230U (en) | A kind of radiator flat tube with recess eddy generator | |
| CN203053293U (en) | Heat transmission sheet for quadrangular heat exchanger | |
| CN206291771U (en) | One kind combination tooth heat exchange copper tube | |
| CN103940283B (en) | A kind of longitudinal turbulence works in coordination with generating polynomial heat transfer element | |
| CN105758249B (en) | The cascade-type cooling air guiding device of direct air cooling unit | |
| CN204346234U (en) | A kind of heat exchange tube assemblies utilizing annular space to carry out heat exchange | |
| CN204142065U (en) | A kind of filler coupling disc heat exchange tube sheet filler special | |
| CN204461180U (en) | A kind of heat exchanger fin | |
| CN206739955U (en) | Fin spiral heat exchange tube and heat exchanger | |
| CN100334415C (en) | Shell-and-tube heat exchanger of vortx net plate support pipe bundle and its forced heat transfer method | |
| CN111578770A (en) | Cooling device used under high-strength heat flux density | |
| CN106643271B (en) | A kind of pentodont heat exchange copper tube | |
| CN204718454U (en) | A kind of heat exchanger | |
| CN201803635U (en) | High-efficiency heat exchange tube for electrical chiller set condenser | |
| CN218524004U (en) | Pyramid-type combined enhanced heat transfer pipe with built-in airfoil vortex generators | |
| CN105241292B (en) | A kind of more longitudinal Vortexes are just（It is remaining）Raised line design augmentation of heat transfer pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Han Dong Inventor after: Chen Hui Inventor after: Zhao Jinjie Inventor after: Zhou Lei Inventor after: Tian Zhiyun Inventor after: Yue Chen Inventor after: Pu Wenhao Inventor after: He Weifeng Inventor after: Shen Yaoyang Inventor after: Lu Peng Inventor after: Liang Lin Inventor after: Jiao Weiqi Inventor after: Guo Xinxian Inventor before: Shen Yaoyang Inventor before: Zhao Jinjie Inventor before: Zhou Lei Inventor before: Tian Zhiyun Inventor before: Han Dong Inventor before: Yue Chen Inventor before: Pu Wenhao Inventor before: Lu Peng Inventor before: Liang Lin Inventor before: Jiao Weiqi Inventor before: Guo Xinxian Inventor before: Chen Hui |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: SHEN YAOYANG HAN DONG YUE CHEN PU WENHAO LU PENG LIANG LIN JIAO WEIQI GUO XINXIAN CHEN HUI ZHAO JINJIE ZHOU LEI TIAN ZHIYUN TO: HAN DONG YUE CHEN PU WENHAO HE WEIFENG SHEN YAOYANG LU PENG LIANG LIN JIAO WEIQI GUO XINXIAN CHEN HUI ZHAO JINJIE ZHOU LEI TIAN ZHIYUN |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NANTONG CSEMS MACHINERY MANUFACTURE CO., LTD. Free format text: FORMER OWNER: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS Effective date: 20140320 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 210016 NANJING, JIANGSU PROVINCE TO: 226010 NANTONG, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140320 Address after: 226010 No. 118 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Patentee after: Nantong CSEMC Machinery Manufacture Co.,Ltd. Address before: Yudaojie Baixia District of Nanjing City, Jiangsu Province, No. 29 210016 Patentee before: Nanjing University of Aeronautics and Astronautics |