| 摘要 |
A HEAT EXCHANGER TUBE INCLUDES RIBS (5) FORMED IN PROTRUSION ON AN INTERNAL SURFACE OF THE TUBE AND EXTENDING SPIRALLY WITH A SUITABLE DISTANCE BETWEEN ADJACENT RIBS (5), CONCAVITIES (2) FORMED ON THE EXTERNAL SURFACE OF THE TUBE AND EXTENDING SPIRALLY WITH A SUITABLE DISTANCE BETWEEN ADJACENT CONCAVITIES (2),AND A PLURALITY OF INDEPENDENT PROJECTIONS (6) FORMED ON THE EXTERNAL SURFACE OF THE TUBE AND LAID OUT SPIRALLY. THE PROJECTIONS (6) ARE FORMED WITH A RECESS (8) ON THEIR TOP SURFACES IN SUCH A WAY THAT A PORTION (8) ALIGNED WITH THE RIBS (5) ON THE INTERNAL SURFACE OF THE TUBE IS LOWER THAN A PORTION (7) ALIGNED WITH AN AREA BETWEEN THE RIBS (5). FUTHER, THE CONTAVITIES (2) ON THE EXTERNAL SURFACE OF THE TUBE AND THE RIBS (5) ON THE EXTERNAL SURFACE OF THE TUBE ARE FORMED AT MUTUALLY ALIGNED POSITIONS.FIGURE 1
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