Heat transmission tube

Abstract

According to the invention, there is provided a heat transmission tube having a tube body, first grooves formed at a predetermined pitch therebetween on an outer surface of the tube body continuously along a circumferential direction, the first grooves open to an outside, and having an opening portion, a width of which is narrower than that of a bottom portion thereof, and second grooves formed at a predetermined pitch therebetween on the outer surface of tube body continuously along an axial direction, the second grooves having a depth shallower than that of the first grooves, and connecting opening portions of the adjacent first grooves to each other, wherein a projecting member is provided on a bottom surface of each of the first grooves so as to connect a side wall of each of the first grooves to another is brought into contact with the tube body. This heat transmission tube exhibits a high and stable heat transmissibility in both high and low heat flux cases.

Dependencies are inferred from the claim text.