Heat transfer device

In a heat pipe structure, the combination of a first elongated hollow body of relatively high thermal conductivity, said first body being sealed at opposite ends thereof and having an inside wall surface and an outside wall surface, said first body having an elongated chamber therewithin extending coaxially therewith from one sealed end thereof to an opposite sealed end thereof, said chamber being bounded by said inside wall surface of said first hollow body, a second elongated hollow body of wicking material situated in said chamber, said second body being open at opposite ends thereof, said wicking material having a thermal conductivity which is less than that of said first body, said second hollow body having an inside wall surface contacting said chamber and an outside wall surface contacting the inside wall surface of said first body, said second elongated body of wicking material having a plurality of elongated slots therein extending from one open end of said second body in a direction toward the opposite end of said second body so as to expose an elongated area of the inside wall surface of said first body, each of said elongated slots being tapered such that each slot is wider at said one open end of said second body and becomes narrower as the slot extends longitudinally in a direction toward said opposite end of said second body, the elongated area so exposed extending from one sealed end of said first body in a direction toward the opposite end of said first body, said second elongated body of wicking material formed into a plurality of strips between said elongated slots, the strips truncated at their respective ends, and a vaporizable liquid occupying at least said chamber of said first body.