The gravity heat pipe includes a hollow sealed body with at least evaporation and condensation zones, partially filled with a liquid coolant, and a layer of capillary structure made on the inner surface of the body in the evaporation zone as one with it in the form of protrusions and depressions alternately arranged with a fine pitch along the longitudinal axis of the body. The hollow sealed body at least in the evaporation zone is made with at least one flat edge.
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