The ornamental design for a heatexchangertube, as shown and described.
FIG. 1 is a front view of a heat exchanger tube, the opposite side being a mirror image of the side shown herein;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top view thereof, the opposite side being an identical image of the side shown herein;
FIG. 5 is an enlarged view of part 5-5 in FIG. 1 thereof;
FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 1; and,
FIG. 7 is an enlarged view of part 7-7 in FIG. 6 thereof.
In the drawings, the broken lines depict portions of the heat exchanger tube that are environmental subject matter only and form no part of the claimed design.
The broken lines on the ends of the heat exchanger tube in the drawings indicate that any portion of the article beyond what is shown forms no part of the claimed design.