Abstract: An improved device for acting upon fluids by means of a pressure jump is disclosed. The device consists of a nozzle which receives an active fluid. A passive fluid is provided to the nozzle such that it mixes with active fluid to form a two-phase mixture flowing with subsonic velocity. The passive fluid when mixed with the active fluid partially evaporates thereby increasing the stagnation pressure of the mixture and decreasing its stagnation temperature. An expansion chamber is joined with the nozzle where the two-phase mixture is accelerated. An outlet channel with constant cross-sectional area is connected to the expansion chamber. In the outlet channel, the mixture is accelerated to its supersonic velocity so as to create a pressure jump. The nozzle of the device comprises at least one working section and at least one control section. In the working section, the passive fluid is provided into the flow of the active fluid to create a two-phase mixture.

Abstract: A two-phase mixture of at least two fluids which is supplied with subsonic velocity through associated feed lines (4, 3) is accelerated to sound velocity by means of a nozzle (2). Upon the exit from the narrowest cross-sectional area (6) of the nozzle (2) the two-phase mixture is expanded in an expansion chamber (10) to supersonic velocity. The two-phase mixture expanded to supersonic velocity is thereafter brought to ambient pressure substantially as a one-phase mixture after flowing off through a diffuser passage (9) by means of a shock wave built up in an outlet channel (8). The outlet channel (8) has a constant cross-sectional area the hydraulic diameter of which is as great as the hydraulic diameter of the narrowest cross-sectional area (6) of the nozzle (2) or amounts to up to the three-fold of this hydraulic diameter. An outlet (11) provided with a relief valve (22) is connected to the expansion chamber (10).

Abstract: A two-phase mixture of at least two fluids which is supplied with subsonic velocity through associated feed lines (4, 3) is accelerated to sound velocity by means of a nozzle (2). Upon the exit from the narrowest cross-sectional area (6) of the nozzle (2) the two-phase mixture is expanded in an expansion chamber (10) to supersonic velocity. The two-phase mixture expanded to supersonic velocity is thereafter brought to ambient pressure substantially as a one-phase mixture after flowing off through a diffuser passage (9) by means of a shock wave built up in an outlet channel (8). The outlet channel (8) has a constant cross-sectional area the hydraulic diameter of which is as great as the hydraulic diameter of the narrowest cross-sectional area (6) of the nozzle (2) or amounts to up to the three-fold of this hydraulic diameter. An outlet (11) provided with a relief valve (22) is connected to the expansion chamber (10).