texture etc to promote condensation and to wick (without a rope) condensed liquid back to the hot point are also used in heat pipes. I agree with the other com

texture etc to promote condensation and to wick (without a rope) condensed liquid back to the hot point are also used in heat pipes. I agree with the other commenters that "vapor chamber" is a kind of heat pipe, since "heat pipe" doesn't really impose constant radii by definition.