抄録
Usual thermosyphons can only transport heat, from lower to higher positions because they utilize the gravitational force for condensed liquid to flow down from an upper condenser to a lower evaporator. On the other hand, top-heat-type thermosyphons must employ some means to pump up the condensed liquid from the lower condenser to the upper evaporator without consuming any power from outside. In the present report, we first describe the design points of usual heat pipe and thermosyphon, and secondly, as the main subject of this report, review the studies on the top-heat-type thermosyphons which have been published so far. Especially, we pick up four kinds of the top-heat-type thermosyphons and explain briefly about them, because they seem to have more practical applicability.
