Loop heat pipe with fluid slug pipe

A loop heat pipe with fluid slug pipes, comprising:

• an evaporation chamber having a casing and a wick disposed in the casing, the wick not occupying the casing fully so as for a vapor space to be formed between the wick and the casing;
• a return line having two ends defined as a vapor end and a liquid end, respectively, the vapor end connecting to the casing and thereby being in communication with the space, and the liquid end connecting to the casing and thereby being in communication with an inside of the casing;
• and
• a working fluid filling the evaporation chamber;
• wherein a condensation segment is defined as a predetermined length of a body of the return line, allowing a heat-dissipating unit to be disposed on a surface of the condensation segment, a vapor segment is defined as a portion of the return line, the portion extending from the condensation segment to the vapor end, and a liquid segment is defined as another portion of the return line, the another portion extending from the condensation segment to the liquid end, with at least one partition element disposed in an inside of the liquid segment of the return line to thereby divide the liquid segment of the return line into at least two fluid slug pipes not in communication with each other but in communication with the condensation segment and the casing, wherein the at least two fluid slug pipes each have a smaller diameter than the return line.