Patent ID: 6843308

Claim:
A flat sheet structured thermal device using a two-phase active fluid, wherein the device comprises at least four sheets ( 2 , 3 , 4 ) comprising a top sheet ( 4 ), at least two intermediary sheets ( 3 ), and a back sheet ( 2 ) stacked longitudinally on top of one another, wherein each intermediary sheets ( 3 ) has at least one zone etched through its entire thickness in order to contribute to the formation of at least one gas transport channel ( 6 ), the etched zone being longitudinally bordered by at least one groove formed on the same sheet, said at least one groove contributing to the formation of at least one capillary channel ( 9 ) when said sheet ( 3 ) is covered by another sheet ( 3 , 4 ), said at least one capillary channel ( 9 ) communicating longitudinally over its entire length with said at least one gas transport channel ( 6 ), wherein said at least one capillary channel ( 9 ) is of a section adapted to enable the liquid phase of the fluid to be pumped therein by capillary forces; wherein the at least one gas transport channel ( 6 ) has a section greater than that of said at least one capillary channel ( 9 ), and wherein said device allows fluid to pass reversibly between said at least one capillary channel ( 9 ) and said at least one gas transport channel ( 6 ) during the liquid/gas or gas/liquid transition due to temperature variations to which at least one zone of the device ( 50 ) is subjected.