INNER SURFACE GROOVED HEAT TRANSFER TUBE

PROBLEM TO BE SOLVED: To provide an internal surface grooved heat transfer tube with improved heat exchange efficiency by preventing to the utmost a boundary layer from being produced in the vicinity of a bottom surface of a groove, and further preventing heat insulation action by the boundary layer...

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Bibliographische Detailangaben
Hauptverfasser:	FUKATAMI TAKAO, KOUCHI TETSUYA, KIKUCHI SHIN
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION HEAT EXCHANGE IN GENERAL HEATING LIGHTING MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WEAPONS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an internal surface grooved heat transfer tube with improved heat exchange efficiency by preventing to the utmost a boundary layer from being produced in the vicinity of a bottom surface of a groove, and further preventing heat insulation action by the boundary layer. SOLUTION: Many spiral long fins 2 are formed in parallel on an internal peripheral surface of a metal tube 1, each fin taking an axis of the metal tube 1 as a spiral axis. A first groove 6 is formed between these fins 2, and a short fin 4 is formed at least in a part of the aforementioned groove 6 while extending in parallel with the longer fins 2. There is further formed a second groove 8 having a narrower opening width than the first groove 6 between the longer fin 2 and the shorter fin 4.