Abstract
Pool boiling heat transfer experiments were preformed for the diameter D of 1.0 mm 〜 20.0 mm by using ethanol at 0.1 MPa. The trend of the nucleate boiling was well expressed with the Rohsenow correlation for D = 20, 3 and 2 mm. In the case of D = 1.0 mm, the increasing rate of the wall super-heat with an increase in the heat flux was larger than that of the Rohsenow correlation. The heat transfer surface was covered with a large bubble as the heat flux was increased. The heat flux at which the large bubble began to cover the heat transfer surface started to decrease as the diameter of the heat transfer surface became smaller than 2 mm. The CHF of D = 20 mm agreed well with the value predicted with the Kutateladze correlation. The CHF began to decrease as the diameter of the heat transfer surface became smaller than 2 mm.
