| 摘要 |
PURPOSE:To be able to make the thickness of liquid films supplied and formed on the vaporizing surface of a vaporizer carrying out film vaporization thin and stable, and also make a film area large and improve the performance of the vaporizer by using inclined surfaces slanting downward and having a waveform which is designated by a specific formula for one pitch. CONSTITUTION:Vaporizing tubes 1 having corrugated surfaces at their undersides are horizontally arranged. This wave has a shape designated by a formula 1 when co-ordinates in pipe axial direction and vertical direction are taken as x and z respectively. However, the height of the wave is allowed to take 1/2-2 times the value shown by the formula. Fluid as high temp. heat source 2 (for example, fron R 113) is forced to flow in the tubes 1 and at the outside of the tubes 1 vaporizing liquid 3 is dripped from the upper side of a tube group to supply vaporizing liquid at their tube walls. The shape of liquid film 4 adhering and hanging vertically downward on wall surfaces is stabilized by the balance between their surface tension and gravity when the formula is satisfied. Therefore, when cross-sectional shape is conformed to that of a liquid film, increase in vaporizing area due to unevenness in a corrugated surface 1a and stabilization of liquid film thickness provide high vaporizing performance even if liquid films 4 are thin.
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