A cyclone includes a hollow cylindrical upper portion and a hollow conical lower portion having an inclined wall and a base wall. The base wall and the inclined wall are continuous contact with each other, and the inclined wall of the hollow conical lower portion is in continuous contact with an outer wall of the hollow cylindrical upper portion. A total cyclone height is from about 10 to about 30 millimeters, and a ratio of the total cyclone height to an inner diameter of the hollow cylindrical upper portion is from about 0.7 to about 1.3. An angle between an inner surface of the base wall and an inner surface of the inclined wall is from about 110 to about 130 degrees.

A cyclone includes a hollow cylindrical upper portion and a hollow conical lower portion having an inclined wall and a base wall. The base wall and the inclined wall are continuous contact with each other, and the inclined wall of the hollow conical lower portion is in continuous contact with an outer wall of the hollow cylindrical upper portion. A total cyclone height is from about 10 to about 30 millimeters, and a ratio of the total cyclone height to an inner diameter of the hollow cylindrical upper portion is from about 0.7 to about 1.3. An angle between an inner surface of the base wall and an inner surface of the inclined wall is from about 110 to about 130 degrees.

A system for purifying a fibrous suspension consists of multiple hydro-cyclones arranged adjacent to one another in a row, each of the hydro-cyclones having at least one feed connection, one accepted stock connection and one reject material connection, and having at least one supply manifold which is connected to multiple feed connections and/or having at least one accepted stock manifold which is connected to multiple accepted stock connections and/or having at least one reject material manifold which is connected to multiple reject material connections, the manifold being elongated and the corresponding connections discharge at their longitudinal side into the corresponding manifold. At an end of at least one manifold which follows the final hydro-cyclone, a fluid or a suspension is guided via at least one flushing connection into or out of the manifold.

A system for purifying a fibrous suspension consists of multiple hydro-cyclones arranged adjacent to one another in a row, each of the hydro-cyclones having at least one feed connection, one accepted stock connection and one reject material connection, and having at least one supply manifold which is connected to multiple feed connections and/or having at least one accepted stock manifold which is connected to multiple accepted stock connections and/or having at least one reject material manifold which is connected to multiple reject material connections, the manifold being elongated and the corresponding connections discharge at their longitudinal side into the corresponding manifold. At an end of at least one manifold which follows the final hydro-cyclone, a fluid or a suspension is guided via at least one flushing connection into or out of the manifold.

This invention relates to a process and apparatus for growing agricultural products with a reduced abundance of radioactive carbon-14 (.sup.14C) by employing centrifugal separation of atmospheric gases to selectively remove carbon dioxide (CO.sub.2) with .sup.14C. Agricultural products with reduced .sup.14C content can be grown in controlled environments with filtered atmospheric gases for the benefit of reducing harmful damage to human DNA that is unavoidable with our current food chain, due to the natural abundance of .sup.14C in atmospheric gases. Bilateral and unilateral compression helikon vortex apparatus provide efficient and economical removal of CO.sub.2 with .sup.14C from atmospheric gases with a single filtration pass, which is ideally suited for large scale agricultural production.

This invention relates to a process and apparatus for growing agricultural products with a reduced abundance of radioactive carbon-14 (.sup.14C) by employing centrifugal separation of atmospheric gases to selectively remove carbon dioxide (CO.sub.2) with .sup.14C. Agricultural products with reduced .sup.14C content can be grown in controlled environments with filtered atmospheric gases for the benefit of reducing harmful damage to human DNA that is unavoidable with our current food chain, due to the natural abundance of .sup.14C in atmospheric gases. Bilateral and unilateral compression helikon vortex apparatus provide efficient and economical removal of CO.sub.2 with .sup.14C from atmospheric gases with a single filtration pass, which is ideally suited for large scale agricultural production.

One illustrative cyclone separator disclosed herein includes an outer body, an inner body positioned at least partially within the outer body, an internal flow path within the inner body, the internal flow path having a fluid entrance and a fluid outlet, a first fluid flow channel between the inner body and the outer body, and a re-entrant fluid opening that extends through the outer body and is in fluid communication with the fluid flow channel, wherein the re-entrant fluid opening is positioned at a location upstream of the fluid entrance of the internal flow path in the inner body.

One illustrative cyclone separator disclosed herein includes an outer body, an inner body positioned at least partially within the outer body, an internal flow path within the inner body, the internal flow path having a fluid entrance and a fluid outlet, a first fluid flow channel between the inner body and the outer body, and a re-entrant fluid opening that extends through the outer body and is in fluid communication with the fluid flow channel, wherein the re-entrant fluid opening is positioned at a location upstream of the fluid entrance of the internal flow path in the inner body.

A hand vacuum cleaner with a finger grip area that is provided between a forward side of the handle and a rear side of the main body, and wherein the suction motor is positioned between the cyclone and the finger grip area and an axis that extends between the front of the cyclone and the handle extends through the suction motor.

A hand vacuum cleaner with a finger grip area that is provided between a forward side of the handle and a rear side of the main body, and wherein the suction motor is positioned between the cyclone and the finger grip area and an axis that extends between the front of the cyclone and the handle extends through the suction motor.