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A heat pipe has an evaporator portion, a condenser portion, and at least one flexible portion that is sealingly coupled between the evaporator portion and the condenser portion. The flexible portion has a flexible tube and a flexible separator plate held in place within the flexible tube so as to di

A heat pipe has an evaporator portion, a condenser portion, and at least one flexible portion that is sealingly coupled between the evaporator portion and the condenser portion. The flexible portion has a flexible tube and a flexible separator plate held in place within the flexible tube so as to divide the flexible tube into a gas-phase passage and a liquid-phase artery. The separator plate and flexible tube are configured such that the flexible portion is flexible in a plane that is perpendicular to the separator plate.

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1. A heat pipe, comprising: an evaporator portion;a condenser portion; andat least one flexible portion sealingly coupled between the evaporator portion and the condenser portion, the at least one flexible portion comprising:a flexible tube comprising an interior volume and a plurality of inner edge

1. A heat pipe, comprising: an evaporator portion;a condenser portion; andat least one flexible portion sealingly coupled between the evaporator portion and the condenser portion, the at least one flexible portion comprising:a flexible tube comprising an interior volume and a plurality of inner edges; anda flexible separator plate comprising two lateral edges that are disposed proximate to the inner edges of the tube,wherein the interior volume comprises a gas-phase passage on a first side of the flexible separator plate and a liquid-phase artery on an opposing second side of the flexible separator plate, the separator plate further comprising a first plane that passes through the two lateral edges when the separator plate is flat,wherein the separator plate and flexible tube are configured such that the at least one flexible portion is flexible in at least a second plane that is perpendicular to the first plane,wherein the first plane comprises a centerline that is midway between the two lateral edges when the separator plate is flat,wherein the flexible portion is flexible in any plane that passes through the centerline of the separator plate,wherein the evaporator portion comprises a separation plate, a gas-phase passage, a liquid-phase artery, and a vent hole formed through the separator plate so as to connect the gas-phase passage to the liquid-phase artery, the vent hole comprising a diameter that is greater than or equal to a diameter of the largest circle that can be inscribed within the liquid-phase artery in a cross-section of the evaporator portion taken perpendicular to a centerline of the evaporator portion,wherein the flexible tube comprises a bellows tube that comprises a plurality of individual bellows each comprising an opening defined by the lateral edge of the separation plate and an inner surface of the individual bellows, andwherein each opening has a respective hydraulic diameter that is less than the diameter of the vent hole. 2. The heat pipe of claim 1, wherein: the first plane comprises a centerline that is midway between the two lateral edges when the separator plate is flat; andthe flexible portion is flexible in any plane that passes through the centerline of the separator plate. 3. The heat pipe of claim 1, further comprising a coil spring disposed in the gas-phase passage of the flexible portion. 4. The heat pipe of claim 3, wherein: the coil spring comprises a plurality of coils;at least one of the plurality of coils is in contact with at least one of the inner edges of the flexible tube; andat least one of the plurality of coils is in contact with the separation plate.