| 摘要 |
PURPOSE:To increase the heat transmit quantity in a boiling region, by providing many concave and convex surfaces in a heat transmit surface, and lifting the heat flux in a nucleate boiling region in the increasing direction by the effect of an electric field. CONSTITUTION:Many concave and convex parts are provided in the heat transmit surface 12. Then bubbles 14 are generated in the concave part 13. In order to increase the heat flux at the time of the nuclear boiling, it is better that said bubble should leave the heat transmit surface 12 quickly. When the high voltage electric field is imparted by an electrode 15, a force E1, which weakens surface tension T1 at a lower end G of the bubble 14, is acted. Therefore, the bubble 14 becomes easy to leave the heat transmit surface 12, and the heat transmit coefficient at the time of nuclear boiling is increased by that amount. |
