Heat pipe

A heat transfer device comprising:

• a tubular member closed at both ends to form an enclosed chamber for containing a quantity of working fluid operable to be in a liquid state and a vapor state at the working temperature of the device, said tubular member having a generally horizontally extending evaporator section at a first end and a condenser section at a second end in spaced relationship to the first end, said condenser section forming an angular extension upwardly of the evaporator section, a flow separator means for dividing the tubular member into adjust passage surrounded by a second passage, the first passage being formed a distance of not less than 90% of the inner dimension of the tubular member from the tubular member's first and second closed ends for open communication with the second passage, said first passage having an inner dimension defining the cross section of said flow path at least 45% of the inner dimension of the said tubular member, said first passage operative to pass working fluid in the vapor state from the evaporator section into the second passage at the condenser section for condensation to the liquid state and return through the second passage to the evaporator section whereby during operation of said heat pipe heat is transferred between said sections.