US20150316329A1 - A grooved tube - Google Patents

A grooved tube Download PDF

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Publication number
US20150316329A1
US20150316329A1 US14/647,302 US201314647302A US2015316329A1 US 20150316329 A1 US20150316329 A1 US 20150316329A1 US 201314647302 A US201314647302 A US 201314647302A US 2015316329 A1 US2015316329 A1 US 2015316329A1
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US
United States
Prior art keywords
rib
roughened
grooved
tube
grooved tube
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.)
Abandoned
Application number
US14/647,302
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English (en)
Inventor
Yanping Lang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Luvata Alltop Zhongshan Ltd
Original Assignee
Luvata Espoo Oy
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 Luvata Espoo Oy filed Critical Luvata Espoo Oy
Assigned to LUVATA ESPOO OY reassignment LUVATA ESPOO OY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LANG, Yanping
Publication of US20150316329A1 publication Critical patent/US20150316329A1/en
Assigned to LUVATA ALLTOP (ZHONGSHAN) LTD. reassignment LUVATA ALLTOP (ZHONGSHAN) LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LUVATA ESPOO OY
Abandoned legal-status Critical Current

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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
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
    • F28F13/187—Heat-exchange surfaces provided with microstructures or with porous coatings especially adapted for evaporator surfaces or condenser surfaces, e.g. with nucleation sites

Definitions

  • the present invention relates to a grooved tube, in particular, to a seamless grooved tube for heat transfer.
  • a seamless tube especially those made of materials of high heat-conductivity such as copper and aluminum, are used in a heat exchanger to circulate heat-carrying fluid to transfer heat.
  • the tube is internally grooved to increase the inner surface for larger heat exchange area between the heat-carrying fluid and the surface of the tube and to generate turbulence, which improves heat exchange efficiency.
  • the roughened surface of the rib increases the contact area between the heat-carrying fluid and the inner surface of the tube and thus improves the heat exchange efficiency. Moreover, the rough surface provides more spots for bubble formation—“nucleation sites”—in comparison with a smooth surface. Bubble formation speeds up heat exchange and thus also improves the heat exchange efficiency.
  • the grooved tube is seamless.
  • the roughened part of the at least one rib comprises a plurality of recesses, the plurality of recesses being dimensioned such that the depths of the recesses range from 0.0001 mm to 0.01 mm and the sizes of the openings of the recesses at the plane of the bottom of the rib range from 0.0001 mm to 0.01 mm.
  • the heights of the protrusions are in the range of 0.001 mm to 0.005 mm and the sizes of the cross-sections at the bases of the protrusions are in the range of 0.001 mm to 0.005 mm.
  • the at least one rib has a top, side surfaces, and a bottom, wherein the top and the side surfaces of the at least one rib are smooth, and at least a portion of the bottom of the at least one rib is roughened.
  • the tube is made of copper or copper alloy.
  • the high thermal conductivity of copper and copper alloys results in high heat exchange efficiency of the tube according to this embodiment.
  • the tube is made of copper.
  • the at least one rib is configured as a helix on the inner surface of the tube.
  • the helical rib causes turbulence in the fluid and thus also improves heat exchange efficiency.
  • the roughened part of the at least one rib is made by drawing the tube through a die, at least a part of the surface of the die being roughened so as to roughen the at least a part of the at least one rib during drawing.
  • the roughened part of the at least one rib is made by sintering metal particles onto the part of the at least one rib to be roughened.
  • FIG. 1 b shows the transverse cross-sectional view of the seamless grooved tube shown in FIG. 1 a;
  • FIG. 2 is a cross-sectional view of a seamless grooved tube according to one embodiment of the present disclosure, illustrating the roughened inner surface of the tube;
  • FIG. 3 is a cross-sectional view of a seamless grooved tube according to another embodiment of the present disclosure, illustrating the roughened inner surface of the tube.
  • FIG. 1 a shows the longitudinal cross-sectional view
  • FIG. 1 b shows the transverse cross-sectional view of a seamless grooved tube according to one embodiment of the present disclosure.
  • the tube is seamless as it is made through drawing a solid billet over a piercing rod to create a hollow shell (in contrast, a welded tube is made by rolling a plate and welding two edges of the plate); the tube, however, may also be a welded one.
  • the inner surface of the tube is grooved into a pattern.
  • the grooved pattern shown in FIGS. 1 a and 1 b includes at least one rib 1 , which comprises a top 2 , side surfaces 3 , and a bottom 4 .
  • the presence of the rib 1 increases the area of the inner surface of the tube, and thus increases the heat exchange area between the heat-carrying fluid and the inner surface of the tube, and consequently gives higher heat exchange efficiency.
  • the flow of the heat-carrying fluid is impacted by the rib 1 ; a portion of the fluid has to flow in conformity with the helical path along which the rib 1 extends, i.e., being guided by the rib 1 to flow in a helical manner, which causes turbulence in the fluid and thus also improves heat exchange efficiency.
  • the heat exchange efficiency of the seamless grooved tube can be further improved by having at least a part of the surface of the rib 1 roughened.
  • the roughened surface of the rib 1 can further increase the contact area between the heat-carrying fluid and the inner surface of the tube and thus further improves the heat exchange efficiency.
  • the rough surface provides more spots for bubble formation (bubble formation is a phase transition, which results from a process named “nucleation”, which usually happens on an interface such as a rough wall), whereby small bubbles will detach from the surface.
  • the roughness can be distributed on the surface of the rib 1 in any suitable pattern.
  • the whole surface of the rib 1 including the top 2 , the side surfaces 3 , and the bottom 4 , may be roughened; only the side surfaces 2 of the rib 1 is roughened; or the top 2 and the side surfaces 3 are roughened.
  • FIGS. 2 and 3 show two embodiments of the present disclosure where at least a portion of the bottom 4 of the rib 1 is roughened, yet the top 2 and the side surfaces 3 of the rib 1 are smooth.
  • FIG. 2 demonstrates one form, where the bottom 4 of the rib 1 comprises a plurality of recesses 5 .
  • the recesses 5 are irregularly distributed on the bottom 4 .
  • the recesses 5 can be of any shape; e.g., a recess's opening at the plane of the bottom may be a substantial circle, a square or any other regular or irregular shape, and the opening tapers while extending downward so that the recess is formed into a substantial spherical cap/cone, an inverted pyramid or any other regular or irregular shape.
  • the recesses 5 may be dimensioned such that the sizes of the openings (measured as the largest distance between two points of the circumference of the opening that are farthest from each other) of the recesses 5 at the bottom 4 range from 0.0001 mm to 0.01 mm, and the depths of the recesses (measured from the plane of the bottom 4 , i.e., the top of a recess 5 , to the bottom of a recess 5 ) range from 0.0001 mm to 0.01 mm.
  • the size of the openings of the recesses 5 may be 0.0001 mm, 0.001 mm, 0.005 mm, or any size falling between 0.0001 mm and 0.005 mm.
  • the depths of the recesses 5 may be 0.0001 mm, 0.001 mm, 0.005 mm, or any depth falling between 0.0001 mm and 0.005 mm.
  • the roughened surface of the seamless grooved tube described above can be made via any suitable process.
  • the roughened surface may be made by drawing the tube through a die with at least a part of the surface of the die roughened so as to roughen the at least a part of the at least one rib during drawing.
  • FIG. 3 demonstrates another embodiment of a roughened surface.
  • the bottom 4 of the rib 1 comprises a plurality of protrusions.
  • the protrusions 6 are irregularly distributed on the bottom 4 .
  • the protrusions 6 can be of any shape; e.g., the cross section of a protrusion 6 taken along a plane parallel to the bottom 4 may be a substantial circle, square, or any other regular or irregular shape, and the cross-section tapers towards the tip of the protrusion so that the recess is formed into a substantial cone, pyramid or any other regular or irregular shape.
  • the protrusions 6 may be dimensioned such that the sizes of the cross-section (measured as the largest distance between two points of the circumference of the cross-section that are farthest from each other) of at the respective bases of protrusions range from 0.0001 mm to 0.01 mm, and the heights of the protrusions 6 range from 0.0001 mm to 0.01 mm.
  • the sizes of the cross-sections of the bases of the protrusions may be 0.0001 mm, 0.001 mm, 0.005 mm or values between theses sizes.
  • the heights of the protrusions may be 0.0001 mm, 0.001 mm, 0.005 mm or values between theses sizes.
  • the roughened surface of the seamless grooved tube described above can be made via any suitable process.
  • it can be made by sintering metal particles onto the corresponding inner surface.
  • a core rod is inserted into the tube, with a gap reserved between the inner wall of the tube and the core rod; metal particles are filled into the part of the gap that corresponds to the roughened surface, and then the tube with the core rod and the metal particles are heated so that the metal particles are sintered on the part of the inner surface to be roughened.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Metal Extraction Processes (AREA)
  • Powder Metallurgy (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US14/647,302 2012-12-07 2013-11-06 A grooved tube Abandoned US20150316329A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201210523540.9A CN103851945B (zh) 2012-12-07 2012-12-07 具有粗糙内表面的内螺纹管
CN201210523540.9 2012-12-07
PCT/EP2013/073110 WO2014086543A1 (en) 2012-12-07 2013-11-06 A grooved tube

Publications (1)

Publication Number Publication Date
US20150316329A1 true US20150316329A1 (en) 2015-11-05

Family

ID=49546410

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/647,302 Abandoned US20150316329A1 (en) 2012-12-07 2013-11-06 A grooved tube

Country Status (9)

Country Link
US (1) US20150316329A1 (enExample)
EP (1) EP2929270A1 (enExample)
JP (1) JP2016509661A (enExample)
KR (1) KR20150092151A (enExample)
CN (1) CN103851945B (enExample)
BR (1) BR112015013309A2 (enExample)
CA (1) CA2893625A1 (enExample)
MX (1) MX2015007197A (enExample)
WO (1) WO2014086543A1 (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD837357S1 (en) * 2016-09-15 2019-01-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD837356S1 (en) * 2016-09-15 2019-01-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD841145S1 (en) * 2016-09-15 2019-02-19 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
US10436520B2 (en) * 2017-03-31 2019-10-08 Korea Advanced Institute Of Science And Technology Plate pulsating heat spreader with artificial cavities

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104197753A (zh) * 2014-09-18 2014-12-10 苏州新太铜高效管有限公司 冷凝器用换热管
CN105806114A (zh) * 2016-04-28 2016-07-27 汤勇 一种新型多尺度铝平带热管的制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6308775B1 (en) * 1996-03-28 2001-10-30 Km Europa Metal Ag Heat exchanger tube
WO2002084197A1 (en) * 2001-04-17 2002-10-24 Wolverine Tube, Inc. Improved heat transfer tube with grooved inner surface
US6925711B2 (en) * 2000-10-27 2005-08-09 Alcoa Inc. Micro-textured heat transfer surfaces

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JPS604797A (ja) * 1983-06-21 1985-01-11 Kobe Steel Ltd 内面溝付伝熱管とその製造方法
JP2524983B2 (ja) * 1986-09-01 1996-08-14 古河電気工業株式会社 小径伝熱管
JPH0572785A (ja) * 1991-09-17 1993-03-26 Mitsubishi Kasei Corp 電子写真感光体用基体及びその製造方法
JPH0875384A (ja) * 1994-07-01 1996-03-19 Hitachi Ltd 非共沸混合冷媒用伝熱管とその伝熱管を用いた熱交換器及び組立方法及びその熱交換器を用いた冷凍・空調機
DE19510124A1 (de) * 1995-03-21 1996-09-26 Km Europa Metal Ag Austauscherrohr für einen Wärmeaustauscher
TW327205B (en) * 1995-06-19 1998-02-21 Hitachi Ltd Heat exchanger
JP3331518B2 (ja) * 1997-01-13 2002-10-07 株式会社日立製作所 内面フィン付き伝熱管及び熱交換器
US6176301B1 (en) * 1998-12-04 2001-01-23 Outokumpu Copper Franklin, Inc. Heat transfer tube with crack-like cavities to enhance performance thereof
US8573022B2 (en) * 2002-06-10 2013-11-05 Wieland-Werke Ag Method for making enhanced heat transfer surfaces
MXPA06004459A (es) * 2003-10-23 2006-06-20 Wolverine Tube Inc Metodo y herramienta para fabricar superficies de transferencia de calor mejorada.
JP4550451B2 (ja) * 2004-03-11 2010-09-22 古河電気工業株式会社 内面溝付伝熱管及び内面溝付伝熱管を用いた熱交換器
JP5208562B2 (ja) * 2008-04-04 2013-06-12 住友軽金属工業株式会社 継目無管
JP2011021844A (ja) * 2009-07-17 2011-02-03 Sumitomo Light Metal Ind Ltd 内面溝付伝熱管及び蒸発器用のクロスフィンチューブ型熱交換器
JP2011075122A (ja) * 2009-09-29 2011-04-14 Sumitomo Light Metal Ind Ltd アルミニウム製内面溝付伝熱管
JP5534777B2 (ja) * 2009-10-28 2014-07-02 株式会社Ｕａｃｊ 銅合金継目無管

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6308775B1 (en) * 1996-03-28 2001-10-30 Km Europa Metal Ag Heat exchanger tube
US6925711B2 (en) * 2000-10-27 2005-08-09 Alcoa Inc. Micro-textured heat transfer surfaces
WO2002084197A1 (en) * 2001-04-17 2002-10-24 Wolverine Tube, Inc. Improved heat transfer tube with grooved inner surface

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD837357S1 (en) * 2016-09-15 2019-01-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD837356S1 (en) * 2016-09-15 2019-01-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD841145S1 (en) * 2016-09-15 2019-02-19 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD841142S1 (en) 2016-09-15 2019-02-19 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD895094S1 (en) 2016-09-15 2020-09-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD901663S1 (en) 2016-09-15 2020-11-10 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
US10436520B2 (en) * 2017-03-31 2019-10-08 Korea Advanced Institute Of Science And Technology Plate pulsating heat spreader with artificial cavities

Also Published As

Publication number Publication date
CN103851945A (zh) 2014-06-11
MX2015007197A (es) 2016-08-18
EP2929270A1 (en) 2015-10-14
CA2893625A1 (en) 2014-06-12
WO2014086543A1 (en) 2014-06-12
CN103851945B (zh) 2017-05-24
BR112015013309A2 (pt) 2017-07-11
KR20150092151A (ko) 2015-08-12
JP2016509661A (ja) 2016-03-31

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AS Assignment

Owner name: LUVATA ESPOO OY, FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LANG, YANPING;REEL/FRAME:036182/0653

Effective date: 20150619

AS Assignment

Owner name: LUVATA ALLTOP (ZHONGSHAN) LTD., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LUVATA ESPOO OY;REEL/FRAME:041183/0848

Effective date: 20170126

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION