Abstract
Experiments with a copper-water wickless heat pipe were carried out. The influence of working fluid fill charge and inclination angle on the heat transfer coefficients of the evaporator and the condenser was studied. The following results are summarized. (1) The heat transfer of the evaporator does not depend on the inclination angle. (2) As the heat transfer coefficient in the case of the liquid film is larger than that in the case of the liquid pool, the more the liquid fill ratio decreases, the more the evaporation heat transfer coefficient increases. (3) In the region of nucleate boiling, if dry spots do not exist on the evaporator, the evaporation heat transfer characteristics agree with Kutateladze's correlation in the cases of V+=0.283 and 0.455. (4) The condensation heat transfer agrees with Nusselt's equation at the inclination angle of 90 degrees. However, the equation does not agree with the condensation heat transfers at the other inclination angles.
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