A decontaminating system (100) comprising a decontaminant reservoir (152), a transport fluid source (160) and a mist generating apparatus (10). The mist generating apparatus (10) has a longitudinal axis and comprises a first fluid passage (38) having a first fluid inlet (18) in fluid communication w
A decontaminating system (100) comprising a decontaminant reservoir (152), a transport fluid source (160) and a mist generating apparatus (10). The mist generating apparatus (10) has a longitudinal axis and comprises a first fluid passage (38) having a first fluid inlet (18) in fluid communication with the decontaminant reservoir (152) and a first fluid outlet (84), and a second fluid passage (90) having a second fluid inlet (20) in fluid communication with the transport fluid source (160) and a second fluid outlet (94). The first passage (38) surrounds the second fluid passage (90) and the first and second outlets (84, 94) are oriented relative to one another such that they have an angle of incidence between (5) and (30) degrees. The second fluid passage (90) includes a throat portion (92) located between the second fluid inlet (20) and the second fluid outlet (94), the throat portion (92) having a smaller cross sectional area than that of either the second fluid inlet (20) or second fluid outlet (94).
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1. A decontamination system comprising: a decontaminant reservoir;a transport fluid source; anda mist generating apparatus having a longitudinal axis, the apparatus comprising:a curved divergent-convergent first fluid passage having a first fluid inlet in fluid communication with the decontaminant r
1. A decontamination system comprising: a decontaminant reservoir;a transport fluid source; anda mist generating apparatus having a longitudinal axis, the apparatus comprising:a curved divergent-convergent first fluid passage having a first fluid inlet in fluid communication with the decontaminant reservoir, the first fluid inlet defining an inlet area, an annular first fluid outlet defining an outlet area, and an intermediate portion defining an intermediate area greater than each of the inlet area and the outlet area, the curved divergent-convergent first fluid passage having an outer surface with a curved profile between at least the intermediate area and outlet area; anda convergent-divergent second fluid passage having a second fluid inlet in fluid communication with the transport fluid source and an annular second fluid outlet,wherein the first fluid passage surrounds the second fluid passage, and the first and second outlets are oriented relative to one another such that they have an angle of incidence between 5 and 30 degrees; wherein a cross-sectional area of the second fluid outlet is larger than a cross-sectional area of the first fluid outlet; andthe second fluid passage includes a throat portion located between the second fluid inlet and the second fluid outlet, the throat portion having a smaller cross sectional area than that of either the second fluid inlet or second fluid outlet. 2. The system of claim 1, wherein the area ratio between the throat portion and the second fluid outlet is between 2:3 and 1:4. 3. The system of claim 1, wherein the first and second passages are coaxial with the longitudinal axis of the apparatus. 4. The system of claim 1, wherein the mist generating apparatus further comprises a first fluid supply channel having a first end adapted to be connected to the decontaminant reservoir and a second end connected to the first fluid inlet, and a second fluid supply channel having a first end adapted to be connected to the transport fluid source and a second end connected to the second fluid inlet, wherein the first and second supply channels are substantially parallel to the longitudinal axis of the apparatus. 5. The system of claim 4, wherein the mist generating apparatus comprises a base member that contains the first and second supply channels. 6. The system of claim 5, wherein the mist generating apparatus further comprises a funnel member and an elongate plug member, wherein the funnel member has a bore and is adapted to coaxially locate upon the base such that the bore communicates with the second fluid supply channel, and wherein the plug member is adapted to be attached to the base member such that a portion of the plug lies within the bore and the second fluid passage is defined between the funnel and the plug. 7. The system of claim 6, wherein the mist generating apparatus further comprises a cover member which encloses the base member, the funnel member and the plug member such that the first fluid passage is defined between an outer surface of the funnel and an inner surface of the cover member. 8. The system of claim 7, wherein the cover member has a first end adapted to coaxially locate upon the base member and be attached thereto, and a second end having an outlet adapted to communicate with the first and second fluid outlets. 9. The system of claim 8, wherein the second end of the cover includes an axially projecting lip portion, the lip portion defining an aperture in communication with the first and second fluid outlets. 10. The system of claim 7, wherein the plug member has a first end which attaches to the base member and a second end which defines the second fluid passage, wherein the second end is concave. 11. The system of claim 7, wherein the funnel member includes a radially projecting flange portion, wherein the flange portion is sandwiched between the base member and the cover member to maintain the axial position of the funnel member relative to the base member. 12. The system of claim 7, wherein the axial position of the cover member may be adjusted relative to the base member. 13. The system of claim 6, wherein the plug member is threaded onto the base such that the axial position of the plug member may be adjusted relative to the base and the funnel member. 14. A system for decontaminating an enclosed space, wherein the system includes the system of claim 1. 15. A decontamination room or enclosure including a decontaminating system as claimed in claim 1. 16. A decontaminating system comprising: a decontaminant reservoir;a transport fluid source; anda mist generating apparatus having a longitudinal axis, the apparatus comprising:a curved divergent-convergent first fluid passage having a first fluid inlet in fluid communication with the decontaminant reservoir, the first fluid inlet defining an inlet area, an annular first fluid outlet defining an outlet area, and an intermediate portion defining an intermediate area greater than each of the inlet area and the outlet area, the curved divergent-convergent first fluid passage having an outer surface with a curved profile between at least the intermediate area and outlet area; anda convergent-divergent second fluid passage having a second fluid inlet in fluid communication with the transport fluid source and an annular second fluid outlet,wherein the first fluid passage surrounds the second fluid passage, andthe first and second fluid outlets are oriented relative to one another such that they have an angle of incidence of less than 90 degrees; wherein a cross-sectional area of the second fluid outlet is larger than a cross-sectional area of the first fluid outlet; andthe second fluid passage includes a throat portion located between the second fluid inlet and the second fluid outlet, the throat portion having a smaller cross sectional area than that of either the second fluid inlet or the second fluid outlet such that the area ratio between the throat portion and the second fluid outlet is between 2:3 and 1:4. 17. The system of claim 16, wherein the first and second passages are coaxial with the longitudinal axis of the apparatus. 18. The system of claim 16, wherein the mist generating apparatus further comprises a first fluid supply channel having a first end adapted to be connected to the decontaminant reservoir and a second end connected to the first fluid inlet, and a second fluid supply channel having a first end adapted to be connected to the transport fluid source and a second end connected to the second fluid inlet, wherein the first and second supply channels are substantially parallel to the longitudinal axis of the apparatus. 19. The system of claim 18, wherein the mist generating apparatus comprises a base member that contains the first and second supply channels. 20. The system of claim 19, wherein the mist generating apparatus further comprises a funnel member and an elongate plug member, wherein the funnel member has a bore and is adapted to coaxially locate upon the base such that the bore communicates with the second fluid supply channel, and wherein the plug member is adapted to be attached to the base member such that a portion of the plug lies within the bore and the second fluid passage is defined between the funnel and the plug. 21. The system of claim 20, wherein the mist generating apparatus further comprises a cover member which encloses the base member, the funnel member and the plug member such that the first fluid passage is defined between an outer surface of the funnel and an inner surface of the cover member. 22. The system of claim 21, wherein the cover member has a first end adapted to coaxially locate upon the base member and be attached thereto, and a second end having an outlet adapted to communicate with the first and second fluid outlets. 23. The system of claim 22, wherein the second end of the cover includes an axially projecting lip portion, the lip portion defining an aperture in communication with the first and second fluid outlets. 24. The system of claim 20, wherein the plug member has a first end which attaches to the base member and a second end which defines the second fluid passage, wherein the second end is concave. 25. The system of claim 21, wherein the funnel member includes a radially projecting flange portion, wherein the flange portion is sandwiched between the base member and the cover member to maintain the axial position of the funnel member relative to the base member. 26. The system of claim 21, wherein the axial position of the cover member may be adjusted relative to the base member. 27. The system of claim 20, wherein the plug member is threaded onto the base such that the axial position of the plug member may be adjusted relative to the base and the funnel member. 28. A method of generating a decontaminating mist, the method comprising: passing a decontaminant fluid through a curved divergent convergent first fluid passage of a mist generating apparatus, wherein the first fluid passage has an annular first fluid outlet defining an outlet area, and an intermediate portion defining an intermediate area greater than each of an inlet area and the outlet area, the curved divergent-convergent first fluid passage having an outer surface with a curved profile between at least the intermediate area and outlet area;passing a transport fluid through a convergent-divergent second fluid passage of the mist generating apparatus, wherein the second fluid passage has an annular second fluid outlet and a throat portion, the throat portion having a smaller cross sectional area than the second fluid outlet, wherein the first and second outlets are oriented relative to one another such that they have an angle of incidence between 5 and 30 degrees; wherein a cross-sectional area of the second fluid outlet is larger than a cross-sectional area of the first fluid outlet;accelerating the flow of transport fluid through the throat portion of the second fluid passage; andejecting the decontaminant and transport fluids from their respective outlets such that a stream of accelerated transport fluid issuing from the second fluid outlet imparts a shear force on a stream of decontaminant fluid issuing from the first fluid outlet, thereby at least partially atomising the decontaminant fluid to create a dispersed droplet flow regime. 29. A method of generating a decontaminating mist, the method comprising: passing a decontaminant fluid through a curved divergent-convergent first fluid passage of a mist generating apparatus, wherein the first fluid passage has an annular first fluid outlet defining an outlet area, and an intermediate portion defining an intermediate area greater than each of an inlet area and the outlet area, the curved divergent-convergent first fluid passage having an outer surface with a curved profile between at least the intermediate area and outlet area;passing a transport fluid through a convergent-divergent second fluid passage of the mist generating apparatus, wherein the convergent-divergent second fluid passage has an annular second fluid outlet and a throat portion, the throat portion having a smaller cross sectional area than the second fluid outlet such that the area ratio between the throat portion and the second fluid outlet is between 2:3 and 1:4, wherein the first and second fluid outlets are oriented relative to one another such that they have an angle of incidence of less than 90 degrees; wherein a cross-sectional area of the second fluid outlet is larger than a cross-sectional area of the first fluid outlet;accelerating the flow of transport fluid through the throat portion of the second fluid passage; andejecting the decontaminant and transport fluids from their respective outlets such that a stream of accelerated transport fluid issuing from the second fluid outlet imparts a shear force on a stream of decontaminant fluid issuing from the first fluid outlet, thereby at least partially atomising the decontaminant fluid to create a dispersed droplet flow regime. 30. The method of claim 28, wherein the method comprises the further step of creating a turbulent region in the transport fluid downstream of the outlets; and passing the dispersed droplet flow regime through the turbulent region, thereby further atomising the dispersed droplet flow regime. 31. The method of claim 28, wherein the method comprises the further step of controlling the momentum flux ratio between the decontaminant fluid and the transport fluid by varying the velocity and/or density of the decontaminant fluid and the transport fluid. 32. The method of claim 28, wherein the method comprises the further step of adjusting the cross sectional area of the first fluid outlet in order to vary the exit velocity of the decontaminant fluid stream. 33. The method of claim 32, wherein the exit velocity is supersonic. 34. A method for decontaminating an enclosed space by generating a decontaminating mist according to the method of claim 28. 35. A method of providing a decontamination system comprising: providing a decontaminant reservoir;providing a transport fluid source; andproviding a mist generating apparatus having a longitudinal axis, the apparatus comprising:a curved divergent-convergent first fluid passage having a first fluid inlet in fluid communication with the decontaminant reservoir, the first fluid inlet defining an inlet area, an annular first fluid outlet defining an outlet area, and an intermediate portion defining an intermediate area greater than each of the inlet area and the outlet area, the curved divergent-convergent first fluid passage having an outer surface with a curved profile between at least the intermediate area and outlet area; anda convergent-divergent second fluid passage having a second fluid inlet in fluid communication with the transport fluid source and an annular second fluid outlet,wherein the first fluid passage surrounds the second fluid passage, and the first and second outlets are oriented relative to one another such that they have an angle of incidence between 5 and 30 degrees; wherein a cross-sectional area of the second fluid outlet is larger than a cross-sectional area of the first fluid outlet; andthe second fluid passage includes a throat portion located between the second fluid inlet and the second fluid outlet, the throat portion having a smaller cross sectional area than that of either the second fluid inlet or second fluid outlet. 36. A method of providing a decontaminating system comprising: providing a decontaminant reservoir;providing a transport fluid source; andproviding a mist generating apparatus having a longitudinal axis, the apparatus comprising:a curved divergent-convergent first fluid passage having a first fluid inlet in fluid communication with the decontaminant reservoir, the first fluid inlet defining an inlet area, an annular first fluid outlet defining an outlet area, and an intermediate portion defining an intermediate area greater than each of the inlet area and the outlet area, the curved divergent-convergent first fluid passage having an outer surface with a curved profile between at least the intermediate area and outlet area; anda convergent-divergent second fluid passage having a second fluid inlet in fluid communication with the transport fluid source and an annular second fluid outlet,wherein the first fluid passage surrounds the second fluid passage, andthe first and second outlets are oriented relative to one another such that they have an angle of incidence of less than 90 degrees; wherein a cross-sectional area of the second fluid outlet is larger than a cross-sectional area of the first fluid outlet; andthe second fluid passage includes a throat portion located between the second fluid inlet and the second fluid outlet, the throat portion having a smaller cross sectional area than that of either the second fluid inlet or the second fluid outlet such that the area ratio between the throat portion and the second fluid outlet is between 2:3 and 1:4.
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