JPS5464059A - Formation of heating tube - Google Patents

Formation of heating tube

Info

Publication number
JPS5464059A
JPS5464059A JP13119777A JP13119777A JPS5464059A JP S5464059 A JPS5464059 A JP S5464059A JP 13119777 A JP13119777 A JP 13119777A JP 13119777 A JP13119777 A JP 13119777A JP S5464059 A JPS5464059 A JP S5464059A
Authority
JP
Japan
Prior art keywords
tube
piriger
projections
dents
axial direction
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.)
Pending
Application number
JP13119777A
Other languages
Japanese (ja)
Inventor
Takuyuki Sato
Tomio Higo
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP13119777A priority Critical patent/JPS5464059A/en
Publication of JPS5464059A publication Critical patent/JPS5464059A/en
Pending legal-status Critical Current

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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

PURPOSE: To obtain a heating tube of a raised overall coefficent of heat transfer by the procedure in which tunnel-shaped cavities are formed on the inner and outer walls of tube by forming dents and projections in mandrel or roll and then by rolling it with piriger -mill rolling in order to accelerate boiling phenomenon.
CONSTITUTION: The dents 10 and the projections 9 are formed in the axial direction of the mandrel 7 or in the diametral direction of the piriger roll 5, and then piriger -mill rolling is made to form grooves matching with the dents and the projections on the inner or outer wall of tube. Then, it is drawn to a fixed final diameter, whereupon the grooves formed suffer compressive stress in its diametral and thicker direction and also suffer tensile stress in its axial direction to deform, forming tunnel-shaped cavities connected in the axial direction of tube. The formation of the cavities enables boiling phenomenon in heating tube to take place very readily, thus giving excellent haet transmission effect.
COPYRIGHT: (C)1979,JPO&Japio
JP13119777A 1977-10-31 1977-10-31 Formation of heating tube Pending JPS5464059A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13119777A JPS5464059A (en) 1977-10-31 1977-10-31 Formation of heating tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13119777A JPS5464059A (en) 1977-10-31 1977-10-31 Formation of heating tube

Publications (1)

Publication Number Publication Date
JPS5464059A true JPS5464059A (en) 1979-05-23

Family

ID=15052290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13119777A Pending JPS5464059A (en) 1977-10-31 1977-10-31 Formation of heating tube

Country Status (1)

Country Link
JP (1) JPS5464059A (en)

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