WO2004099698A1 - Tube d'echange thermique intensif avec nervures discontinues - Google Patents

Tube d'echange thermique intensif avec nervures discontinues Download PDF

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Publication number
WO2004099698A1
WO2004099698A1 PCT/CN2003/000905 CN0300905W WO2004099698A1 WO 2004099698 A1 WO2004099698 A1 WO 2004099698A1 CN 0300905 W CN0300905 W CN 0300905W WO 2004099698 A1 WO2004099698 A1 WO 2004099698A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchange
tube
double
exchange tube
discontinuous
Prior art date
Application number
PCT/CN2003/000905
Other languages
English (en)
Chinese (zh)
Inventor
Ji'an Meng
Weilin Hu
Zhixin Li
Original Assignee
Tsinghua University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tsinghua University filed Critical Tsinghua University
Priority to JP2004571496A priority Critical patent/JP4355294B2/ja
Priority to AU2003280545A priority patent/AU2003280545A1/en
Priority to US10/555,837 priority patent/US20070000651A1/en
Publication of WO2004099698A1 publication Critical patent/WO2004099698A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element

Definitions

  • the invention relates to a discontinuous double-inclined inner rib reinforced heat exchange tube, which belongs to the technical field of enhanced heat exchange and heat exchangers. Background technique
  • Shell and tube heat exchangers have a wide range of applications in petroleum, chemical, power and many other fields.
  • Shell-and-tube heat exchangers usually use smooth round-section tubes, which have the advantages of simple manufacturing process, good safety, and low cost.
  • ordinary shell-and-tube replacement The heater has disadvantages such as large volume and many consumables.
  • people have invented various enhanced heat exchange tubes instead of ordinary round tubes.
  • convective heat transfer enhancement elements have been developed in the past 30 years.
  • the surface-roughened heat-exchanging tubes obtained by rolling have been widely and successfully applied in engineering, such as spirally grooved tubes and transverse grooved tubes.
  • the object of the present invention is to provide a new type of reinforced heat exchange tube-a "discontinuous double-inclined inner rib reinforced heat exchange tube", that is, a plurality of discontinuous, angled axes and inclined in two directions are provided in the tube.
  • a pair of oblique inner ribs Under the action of many double-inclined internal ribs, the fluid generates longitudinal vortices and / or other fluids in the tube, especially near the inner wall surface.
  • the radial flow inside the tube can significantly enhance heat exchange.
  • the invention is characterized in that there are discontinuous ribs on the inner wall surface of the reinforced heat exchange tube, which have a certain angle with the axis of the base tube and are inclined in two directions.
  • the rib and the right-handed oblique inner rib the height of the double oblique inner rib is equal to or less than 0.2d, the width is equal to or less than 0.5d, and the length of the double oblique inner rib is equal to or less than 2d, where d is the hydraulic inner diameter of the base pipe; preferably,
  • An included angle between the axis of the double-slanted inner rib and the axis of the base pipe is in the range of (5 ⁇ 85) degrees, a positive sign indicates a left-handed tilt, and a negative sign indicates a right-handed tilt; preferably, the double-slanted
  • the shape of the cross section of the inner rib is any one or a combination of the following: arc, rectangle, triangle, fan, streamline, and any shape composed of several curve
  • Examples 1 to 3 can generally increase the heat transfer coefficient by 80% to 150% for turbulent flow, which can be 30% higher than that of a horizontal grooved tube with good heat transfer effect, but its flow resistance is higher than that of a horizontal grooved tube.
  • the tube is 20% -50% smaller; for convective heat transfer in the transition zone, its enhanced heat transfer effect is also very significant, which has very important practical application value in engineering.
  • backflow transverse vortex
  • FIG. 1 to 3 can generally increase the heat transfer coefficient by 80% to 150% for turbulent flow, which can be 30% higher than that of a horizontal grooved tube with good heat transfer effect, but its flow resistance is higher than that of a horizontal grooved tube.
  • the tube is 20% -50% smaller; for convective heat transfer in the transition zone, its enhanced heat transfer effect is also very significant, which has very important practical application value in engineering.
  • backflow transverse vortex
  • FIG. 1 is a structural diagram of a discontinuous double-inclined inner rib reinforced heat exchange tube
  • FIG. 2 is a cross-sectional view taken along A_A in FIG. 1
  • FIG. 3 is a partially enlarged view of part B in FIG. 2
  • FIG. 5 is a schematic diagram of partly circumferential expansion structure of another discontinuous double-inclined-inner-rib reinforced heat-exchange tube.
  • the discontinuous double-inclined inner rib reinforced heat exchange tube is provided with a plurality of discontinuous rib-shaped protrusions on the inner wall surface of the heat exchange tube that have a certain angle with the axis and inclined in two directions.
  • the height of the double oblique inner rib is generally not more than 0.2d, and the width is generally not more than 0.5d.
  • the length is generally not greater than 2d (d is the hydraulic inner diameter of the base pipe).
  • the so-called "discontinuity" is a kind of rough element (ribbed protrusion) with a certain length compared with spiral grooved pipe (spiral continuous), threaded pipe (spiral continuous), and transverse grooved tube (circumferentially continuous). .
  • the manufacturing method of discontinuous double-inclined internal rib reinforced heat exchange tubes can be ordinary round tubes, low-rib tubes, threaded tubes, etc., which can be molded or rolled, or can be formed when rolling seamless tubes, and can also be welded with seams. Tubes take shape. The fluid in the tube generates multiple longitudinal vortices and / or other secondary flows under the action of multiple double-inclined internal ribs on the tube wall, and the vortices and / or other secondary flows are mainly concentrated near the tube wall surface, so that the turbulent heat exchange and The convection heat transfer process in the transition zone has a better strengthening effect.
  • FIG. 1 shows a structure of a discontinuous double-inclined inner rib reinforced heat exchange tube.
  • the inside of the tube has a discontinuous two-way spiral protrusion (referred to as a "discontinuous two-way spiral internal rib"), and the outside of the tube has a discontinuous two-way spiral groove.
  • reference numeral 1 denotes a discontinuous bidirectional spiral rib inside the pipe
  • reference numeral 2 denotes a discontinuous bidirectional spiral groove outside the pipe; the spiral rib and the spiral groove are simultaneously formed during processing.
  • Reference numeral d in FIG. 1 is the hydraulic inner diameter of the heat exchange tube
  • P is the axial length of a single double-inclined internal rib
  • C is the helix angle of the double-inclined internal rib.
  • the reference mark h is the height of the double oblique inner rib.
  • P 0.3d
  • h 0.05d.
  • Embodiment 2 FIG.
  • FIG. 4 illustrates another partially unfolded structure of a discontinuous double-inclined inner rib reinforced heat exchange tube.
  • the inside of the tube has discontinuous two-way spiral protrusions (double oblique inner ribs), and the outside of the tube has a smooth wall surface.
  • reference numeral 3 denotes a discontinuous bidirectional spiral rib arranged symmetrically; One right-slanted rib and one left-slanted rib adjacent to the circumferential direction constitute a vortex generator; four inclined ribs in the same cross section in the circumferential direction constitute two vortex generators.
  • the reference sign C in FIG. 4 is the helix angle of the double oblique internal rib, 0 ⁇ 50 degrees; a positive value indicates a right-handed rotation, a negative value indicates a left-handed rotation, and C in the figure indicates a right-handed rotation angle.
  • reference numeral 4 schematically represents a longitudinal vortex generated by the fluid near the inner wall surface under the action of a discontinuous bidirectional spiral inner rib.
  • FIG. 5 shows a partially circumferentially unfolded structure of another discontinuous double-inclined inner rib reinforced heat exchange tube.
  • the inside of the tube has a discontinuous two-way spiral protrusion (double oblique inner rib), and the outside of the tube has a discontinuous two-way spiral groove.
  • reference numeral 5 represents an asymmetrically arranged discontinuous bidirectional spiral rib
  • reference numeral 6 represents an asymmetrically arranged discontinuous bidirectional spiral groove.
  • a right-handed diagonal rib and a left-handed oblique rib are adjacent to each other in the pipe.
  • the ribs constitute a vortex generator; there are six inclined ribs on the inner wall of a small section of tube (less than 0.5d) to form three vortex generators.
  • the best embodiment of the discontinuous double-inclined inner rib heat exchange tube is rolling or compression forming.
  • the rolling and forming process of bidirectional spiral ribs in discontinuous tubes and bidirectional spiral grooves in outer tubes is a rolling molding process.
  • Discontinuous low-cutting edges are provided on the forming surface of the rolls.
  • the outer wall surface of the heat pipe is formed into a discontinuous two-way spiral groove under the extrusion of a low rolling blade, and the pipe is formed into a discontinuous two-way spiral rib.
  • the tube has discontinuous two-way spiral ribs, and the outer wall of the tube is smooth.
  • One of its manufacturing processes is similar to the manufacturing process of the internally threaded and smooth outer tube.
  • the second manufacturing process is rolling or molding. Reprocessing of formed discontinuous bidirectional spiral ribs inside the tube and bidirectional spiral groove heat exchange tubes outside the tube (cold drawing, etc.).
  • the manufacturing efficiency of the rolling or die-molding method of the discontinuous double-inclined inner rib heat exchange tube is 5-10 times higher than that of ordinary spiral groove, horizontal groove and thread surface heat exchange tubes. This is due to the discontinuousness of the inclined ribs.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un tube d'échange thermique intensif s'opérant dans deux directions. L'invention couvre en outre le champ technique de l'échange thermique intensif et de l'échangeur thermique. Le tube d'échange thermique intensif de l'invention comprend quelques parties prismatiques saillantes, à savoir les nervures discontinues, inclinées dans deux directions. Ces nervures se situent sur la surface intérieure du tube, et forment un angle défini avec les axes du tube. Chaque nervure est égale ou inférieure à 0,2d en hauteur, égale ou inférieure à 0,5d en largeur, et égale ou inférieure à 2d en longueur, d représentant le diamètre intérieur hydraulique du tube de base. L'angle entre la nervure interne et les axes du tube de base se situe dans la plage ? (15-85) degrés. En cas d'écoulement turbulent, et avec le tube d'échange thermique intensif de l'invention, le coefficient de transfert de chaleur augmente de 80 à 150 %, ce qui représente 30 % de plus par rapport au tube rainuré transversal le plus efficace, la résistance à l'écoulement diminuant de 20 à 50 %. De plus, le tube d'échange thermique de l'invention peut incontestablement augmenter l'échange thermique et réduire la résistance à l'écoulement. Il est aussi facilement moulé. Par ailleurs, ce tube d'échange thermique empêche la production de retour d'écoulement autour des nervures internes ainsi que la formation d'une zone morte de flux, ce qui améliore l'effet d'échelle.
PCT/CN2003/000905 2003-05-10 2003-10-27 Tube d'echange thermique intensif avec nervures discontinues WO2004099698A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2004571496A JP4355294B2 (ja) 2003-05-10 2003-10-27 不連続の両方向傾斜内部リブ付き増強熱交換管
AU2003280545A AU2003280545A1 (en) 2003-05-10 2003-10-27 Intensive heat exchange tube with discontinuous ribs
US10/555,837 US20070000651A1 (en) 2003-05-10 2003-10-27 An enhanced heat transfer tube with discrete bidirectionally inclined ribs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB031251323A CN1211633C (zh) 2003-05-10 2003-05-10 不连续双斜内肋强化换热管
CN03125132.3 2003-05-10

Publications (1)

Publication Number Publication Date
WO2004099698A1 true WO2004099698A1 (fr) 2004-11-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2003/000905 WO2004099698A1 (fr) 2003-05-10 2003-10-27 Tube d'echange thermique intensif avec nervures discontinues

Country Status (5)

Country Link
US (1) US20070000651A1 (fr)
JP (1) JP4355294B2 (fr)
CN (1) CN1211633C (fr)
AU (1) AU2003280545A1 (fr)
WO (1) WO2004099698A1 (fr)

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CN103940283A (zh) * 2014-04-02 2014-07-23 中国科学院广州能源研究所 一种纵向涡流协同发生式传热元件

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JP5513738B2 (ja) * 2008-12-24 2014-06-04 東芝キヤリア株式会社 熱交換器およびヒートポンプ式給湯機
CN102435087A (zh) * 2011-09-21 2012-05-02 西安交通大学 一种e型轴对称强化换热元件
CN102570696A (zh) * 2012-03-20 2012-07-11 中科盛创（青岛）电气有限公司 胀管型电机水冷机座
CN102706180A (zh) * 2012-05-25 2012-10-03 南京白云化工环境监测有限公司 沉浸式蛇管换热器
DE102012022363A1 (de) * 2012-11-15 2014-05-15 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Interner Wärmetauscher für eine Kraftfahrzeug-Klimaanlage
CN105509534A (zh) * 2014-09-25 2016-04-20 天津市华春新能源技术发展有限公司 一种斜锥形低阻力翅片管
CN104833256B (zh) * 2015-04-30 2016-10-05 湖南众合节能环保有限公司 管内复合强化传热元件及设有其的换热管
CN104930880B (zh) * 2015-06-06 2017-04-05 浙江工业大学 一种脉动流管壳式换热器及其换热方法
CN105115338B (zh) * 2015-08-31 2017-08-25 东南大学 一种相变蓄热装置
CN105486143A (zh) * 2015-12-18 2016-04-13 重庆东京散热器有限公司 一种散热管结构
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CN107270763B (zh) * 2017-03-23 2023-09-05 托普工业(江苏)有限公司 一种内翅片管换热器
CN109724448B (zh) * 2017-10-27 2021-04-13 中国石油化工股份有限公司 强化传热管、裂解炉以及常减压加热炉
CN109029020A (zh) * 2018-06-27 2018-12-18 芜湖盘云石磨新能源科技有限公司 一种二氧化碳制冷用气体冷却器
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CN111250028B (zh) * 2020-03-26 2022-02-08 河南城建学院 一种大豆加工中精馏塔釜液再利用的美拉德反应器
CN113701137B (zh) * 2020-11-03 2022-07-26 中北大学 一种均温板分布优化的蒸汽锅炉
CN114100539A (zh) * 2021-11-02 2022-03-01 中国石化工程建设有限公司 一种管内强化传热插件及裂解炉

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Also Published As

Publication number Publication date
JP4355294B2 (ja) 2009-10-28
US20070000651A1 (en) 2007-01-04
CN1211633C (zh) 2005-07-20
CN1451937A (zh) 2003-10-29
AU2003280545A1 (en) 2004-11-26
JP2006514733A (ja) 2006-05-11

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