| 摘要 |
DISCLOSED IS A HEAT TRANSFER TUBE WITH GROOVES IN AN INNER SURFACE THEREOF, WHICH IS EXCELLANT IN BOTH EVAPORATION PERFORMANCE AND CONDENSATION PERFORMANCE. IN THE HEAT TRANSFER TUBE WITH GROOVES IN AN INNER SURFACE THEREOF ACCORDING TO THE PRESENT INVENTION, GROOVE PROCESSING REGIONS (1) HAVING A WIDTH W1 AND GROOVE PROCESSING REGIONS (2) HAVING A WIDTH W2 ARE ALTERNATELY ARRANGED IN THE INNER SURFACE THEREOF, AND A LINEAR GROOVE REGION (3) HAVING A WIDTH W3 EXTENDING IN A LONGITUDINAL DIRECTION OF THE TUBE IS ARRANGED BETWEEN THE GROOVE PROCESSING REGION (1) AND THE GROOVE PROCESSING REGION (2).THE WIDTH W1 IS LARGER THAN THE WIDTH W2. A GROUP OF GROOVES WITHIN THE GROOVE PROCESSING REGION (1) ARE HELICALLY FORMED AT A TORSIONAL ANGLE Ǿ1 WITH RESPECT TO A LONGITUDINAL DIRECTION OF THE TUBE, AND A GROUP OF GROOVES WITHIN THE GROOVE PROCESSING REGION (2) ARE AT A TORSIONAL ANGLE Ǿ2 DIFFERENT FROM Ǿ1 WITH RESPPECT TO THE LONGITUDINAL DIRECTION OF THE TUBE AND HELICALLY FORMED SO THAT A TORSIONAL DIRECTION THEREOF IS REVERSED TO A TORSIONAL DIRECTION OF THE GROOVE PROCESSING REGION (1).
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