Grooved heat pipe and method for manufacturing the same

A method for manufacturing a heat pipe comprising the steps of:

• providing a casing with a plurality of tiny grooves axially extending along an inner wall thereof;
• shrinking a diameter of one portion of the casing via a shrinkage tool to enable it to function as an evaporator section of the heat pipe;
• placing at least an artery mesh to contact with the inner wall of the casing;
• vacuuming the casing and placing a predetermined quantity of working fluid in the casing;
• and
• sealing the casing to obtain the heat pipe;
• wherein each of the grooves at the evaporator section has a smaller width than each of the grooves at another section of the heat pipe.

A heat pipe comprising:

• a metal casing having an evaporator section for absorbing heat and a condenser section for dissipating heat, the evaporator section having a diameter smaller than that of the condenser section;
• a plurality of grooves being formed in an inner wall of the metal cashing and extending from the evaporator section to the condenser section, wherein each of the grooves at the evaporator section has a width and an apex angle smaller than those of each of the grooves at the condenser section;
• and
• working fluid filled in the casing.