Abstract: A tube heat exchanger comprising at least one tube extending along a certain axial direction, each tube being provided with heat exchange fins (4) spaced apart from one another along said axial direction and extending radially from said tube, each fins (4) being relief structured to form dimples and a groove/rib (5) arranged at a first distance from said tube, characterized in that said dimples (6) are placed on the outside of the groove/rib and arranged in at least one line surrounding the said groove/rib structure at a second distance from said tube greater than said first distance and in that said groove/rib (5) has a depth along said axial direction greater than the depth of said dimples (6).