| 摘要 |
PURPOSE:To obtain a uniform high heat transfer rate in a low heat flux range, by a method wherein a tape form thin plate provided with side extension parts and comprising a stack of a plurality layers of a plurality of longitudinal-type hollow belts arranged in parallel with each other is provided with communicating parts for the hollow parts and large and small restricted openings by utilizing adjacent extension parts. CONSTITUTION:The size of the restricted opening becomes maximum when the ratio of the effective diameter or the tooth pitch of a gear roll 15 to the pipe diameter of a heat-transmitting pipe blank 16 coincides with a peak part of the extension part 12, and the minimum opening is obtained when the ratio and the peak part are staggered from each other by 1/2. When a heat-transmitting wall is continuedly overheated and the pressure of vapor bubbles in the hollow parts 20 exceeds the pressure of an external liquid, the vapor bubbles are converted into bubbles at the restricted opening 22a where flow resistance is small, and the bubbles are released. On the other hand, due to the reduction in pressure in the interior of the hollow parts 20 accompanied by growth and release of bubbles at the larger restricted opening 22b, the external liquid penetrates in through the smaller restricted opening 22a, whereby the liquid is supplied into the hollow parts 20. In addition, since all of the adjacent hollow parts 20 are communicated with each other through the communicating parts 27, all of the hollow parts are activated, the vapor bubbles 28 and a liquid film 29 can be formed in each of the hollow parts even in a low heat flux range, and a uniform high heat transfer rate can be obtained. |
