Abstract: An LED lamp cooling apparatus (10) includes a substrate (11), a plurality of LEDs (13) electrically connected with the substrate, a heat sink (19) for dissipation of heat generated by the LEDs and a pulsating heat pipe (15) thermally connected with the heat sink. The pulsating heat pipe includes a plurality of heat receiving portions (154) and a plurality of heat radiating portions (155), and contains a working fluid (153) therein. The substrate is attached to the heat receiving portions of the pulsating heat pipe and the heat sink is attached to the heat radiating portions of the pulsating heat pipe. The heat generated by the LEDs is transferred from the heat receiving portions to the heat radiating portions of the pulsating heat pipe through pulsation or oscillation of the working fluid in the pulsating heat pipe.

Abstract: A heat pipe (10) includes a casing (11), a plurality of grooves (12, 13) defined in the casing, and working fluid contained in the casing. The casing includes a first portion (14) and a second portion (15) having a smaller diameter than the first portion. The grooves (12) at the first portion of the casing have greater apex angles and smaller groove width than those of the grooves (13) at the second portion. A method for manufacturing the heat pipe includes the steps of: providing a casing with a plurality of grooves defined in an inner wall thereof; shrinking a diameter of one portion of the casing to enable the portion to function as an evaporator section of the heat pipe; vacuuming and placing a predetermined quantity of working fluid in the casing; sealing the casing to obtain the heat pipe.

Abstract: A loop heat pipe (10) includes an evaporator (11) thermally connected with a heat generating electronic component and including a wick structure (112) disposed therein, a condenser (12) thermally connected with a heat dissipating component, a vapor line (13) and a liquid line (14) connecting the evaporator with the condenser to form a closed loop, a predetermined quantity of bi-phase working medium contained in the closed loop, and an artery mesh (15) located within the liquid line.

Abstract: A pulsating heat pipe (10) includes an elongate capillary tube (11), a working fluid (15) disposed within the elongate tube and an artery mesh (13) disposed in the elongate tube. The capillary tube includes a plurality of heat receiving portions (112) located on a first predetermined part of the elongate tube, and a plurality of heat radiating portions (114) located on a second predetermined part of the elongate tube. The heat receiving and heat radiating portions are alternatively disposed on the elongate tube. The working fluid is propelled to flow between the heat receiving and heat radiating portions via a first channel (132) defined in the artery mesh and a second channel (133) defined between the artery mesh and the elongate tube.

Abstract: A heat pipe (10) includes a longitudinal casing (12) having an evaporator section (121) and a condenser section (122), a major wick structure (14) disposed in an inner wall of the casing, at least one assistant wick structure (16) contacting with an inner wall of the major wick structure and extending between the evaporator section and the condenser section, and working medium filling the casing and saturating the major and assistant wick structures. A diameter of a cross section of the assistant wick structure is smaller than a diameter of a cross section of the major wick structure. The assistant wick structure cooperates with the major wick structure to form a composite wick structure, which increases the capillary force inside the heat pipe and further increases the heat transfer capability of the heat pipe.