| 摘要 |
PURPOSE:To reduce the resistance to two-phase fluid flow of a medium to be evaporated, by arranging heat exchanger plates having corrugation with a constant pitch in the vertical direction to extend vertically and in parallel with each other, and forming cavities and grooves respectively at upward inclined sections and downward inclined sections of the corrugation on the side thereof facing the fluid passages of a work medium. CONSTITUTION:Each of heat exchanger plates 9 is formed with corrugation with a constant pitch P in the vertical direction. By connecting each two heat exchanger plates 9 facing toward each other by means of connecting plates 10, there are formed alternately medium liquid passages 11 formed with enlarged sections 11a and contracted sections 11b alternately and having an open top and a closed bottom and heating fluid passages 15 formed with contracted sections 15a and enlarged sections 15b alternately and having both of the upper and lower ends opened are formed alternately between the heat exchanger plates 9. Further, many cavities 12 are formed at upward inclined sections 9a of the passage 11, while a proper number of small grooves 14 capable of attracting liquid film 22 by the capillary action are formed at downward inclined sections 9b of the passage 11. |
