Liquid purification or separation – Tangential flow or centrifugal fluid action
Reexamination Certificate
2001-07-05
2004-03-30
Reifsnyder, David A. (Department: 1723)
Liquid purification or separation
Tangential flow or centrifugal fluid action
C366S173200, C417S171000, C417S194000
Reexamination Certificate
active
06712968
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and apparatus for treating fluids and, more particularly, but not by way of limitation to a vortex nozzle assembly including improved vortex nozzles.
2. Description of the Related Art
U.S. Pat. No. 4,261,521 discloses a vortex nozzle assembly constructed with a pair of vortex nozzles positioned within a housing in opposed relationship. The housing maintains the axial alignments of the nozzles and their respective nozzle exits and, further, introduces fluid into the vortex nozzles. The fluid enters an interior tapered vortex tube of each vortex nozzle through a straight, round, port tangent to a toroidal cavity. The toroidal cavity is adjacent to a large end of the tapered, conical vortex tube, which is normal to the nozzle axis. The fluid departs from this toroidal section and progresses spirally out toward a nozzle exit as more fluid continuously enters the port. The transition from the toroidal shape to the conical shape is critical. If the inside edge of the cone is tangent to the outside of the toroid, the fluid exits too quickly to form complete coverage of the interior of the vortex tube. Conversely, if the inside edge of the cone starts at the bottom quadrant of the torrous, the exiting fluid interferes with the incoming flow and causes much turbulence.
As fluid is forced spirally out each vortex tube, centrifugal energy flattens a circular section of fluid against the side of the tapered vortex tube. This action accelerates the fluid as it spirals out toward the exit, creating a void inside the vortex tube chamber. When the fluid exits the walls of the vortex tube, it accelerates radially forming a hollow fluid cone. The hollow fluid cone from one vortex nozzle impacts with the hollow fluid cone from the other vortex nozzle inside the housing, which forms a liquid lined, closed chamber. This closed chamber develops a substantial vacuum due to the void caused by the centrifugal energy of the vortex. The energy from the impact of the two hollow fluid cones in the presence of this substantial vacuum effects changes to the fluid.
It is desirable and beneficial for the fluid to form a uniform and thin film, thus exposing the maximum amount of the surface area of the fluid to the effect of the vortex chamber. Additionally, this thin film of fluid becomes the interior liquid wall of the vortex reaction chamber. If the fluid is not uniformly distributed down the walls of the tapered vortex tube when it exits the nozzle, instabilities will develop in the impact pattern between the two nozzles leading to inefficiencies in nozzle performance. These irregularities in fluid distribution are inherent when one starts with a single, circular fluid cross-section entering normally to the axis of the nozzle and attempts to develop that fluid into a uniform, thin-filmed annular section.
Increasing the length of the vortex tube aids in the uniform film development by allowing the fluid more time to develop a stable flow pattern; unfortunately, the additional length greatly increases the frictional losses. These frictional losses lessen the impact energy when the two hollow fluid cones exiting the nozzles collide, thereby limiting the efficiency of the nozzle. The added length also decreases the centrifugal energy available, as the length must be added to the large end of the vortex tube. This makes the toroidal section larger and decreases the rotational speed for a given inlet velocity.
U.S. Pat. No. 5,435,913 adds another inline vortex tube to each nozzle to eliminate a singular entrance port. This has some beneficial effect, particularly when the paired vortex tubes are properly sized and positioned relative to each other. However, properly sizing and positioning of the tandem design nozzle pairs can prove challenging. One must carefully determine the relative sizes and placements as the vortex tube can interfere rather than amplify each other.
Accordingly, there is a long felt need for a vortex nozzle assembly that would provide for a more uniform film thickness in the vortex nozzle and allow for more application design latitude, but in a less complicated arrangement as was accomplished with either the single entry or the tandem nozzle design.
SUMMARY OF THE INVENTION
In accordance with the present invention, a method and apparatus for treating fluids includes a vortex nozzle assembly with improved vortex nozzles. Also provided are an improved overall system, system layout, elbow design, and methods for a vortex system. Also provided is an access port and methods for measuring physical properties at the fluid flows. Also provided is a frame assembly for a vortex system.
The vortex nozzle assembly includes a first vortex nozzle including a passageway therethrough and a port or ports that inlet a first fluid flow into the passageway. The first vortex nozzle imparts a rotation to the first fluid flow thereby creating a first rotated fluid flow. The vortex nozzle assembly further includes and a second vortex nozzle positioned in opposed relation the first vortex nozzle. The second vortex nozzle includes a passageway therethrough and a port or ports that inlet a second fluid flow into the passageway. The second vortex nozzle imparts a rotation to the second fluid flow thereby creating a second rotated fluid flow collided with the first rotated fluid flow. At least a segment of the passageway for each vortex nozzle is tapered, and the port or ports are tangential to the taper of the passageway and enter the passageway at an angle substantially equal to the angle of the taper of the passageway.
REFERENCES:
patent: 4261521 (1981-04-01), Ashbrook
patent: 4526324 (1985-07-01), Stephanoff et al.
patent: 5435913 (1995-07-01), Ashbrook
patent: 5556259 (1996-09-01), Hlavenka
patent: 6045068 (2000-04-01), Ashbrook
Lancer Partnership Ltd.
Makay Christopher L.
Reifsnyder David A.
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