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Methods, systems, and apparatus for mass flow are provided. The apparatus can include a housing, an inlet disposed at a first end of the housing, and an outlet disposed at a second end of the housing. The housing can include a first section and a second section. The second section can have at least

Methods, systems, and apparatus for mass flow are provided. The apparatus can include a housing, an inlet disposed at a first end of the housing, and an outlet disposed at a second end of the housing. The housing can include a first section and a second section. The second section can have at least one tapered sidewall that slopes away from an inner surface of the first section toward the outlet. The apparatus can also include a divider disposed at least partially within the first and second sections of the housing. The divider can have at least one tapered surface disposed proximate the at least one tapered sidewall of the second section. An edge of the divider can be located between the outlet and a point within the second section where the cross-sectional area of the second section is about three times or less a cross-sectional area of the outlet.

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1. An apparatus of mass flow, comprising: a housing having an inlet, an outlet, an internal volume, and a first section that transitions to a tapered second section;a pipe disposed in the internal volume, the pipe having a first end extending through a wall of the first section and a second end that

1. An apparatus of mass flow, comprising: a housing having an inlet, an outlet, an internal volume, and a first section that transitions to a tapered second section;a pipe disposed in the internal volume, the pipe having a first end extending through a wall of the first section and a second end that extends axially along the internal volume, the second end having at least one fluid distribution conduit in which at least one aeration hole is formed; anda divider that includes at least one plate extending from the pipe, the at least one plate disposed at least partially within the first section and the second section of the housing, wherein the plate has at least one tapered surface disposed adjacent to at least one tapered sidewall of the second section. 2. The apparatus of claim 1, wherein an inner surface of the first section is a cylindrical inner surface and an inner surface of the second section is a frustoconical inner surface, wherein the second section transitions from a cross-sectional area of the first section to a reduced cross-sectional area at the outlet, and wherein a side of the divider is secured to at least one of: (i) the inner surface of the first section, and (ii) the inner surface of the second section. 3. The apparatus of claim 1, wherein the at least one tapered sidewall of the second section slopes at an angle ranging from about 60° to about 85° with respect to a longitudinal central axis of the housing, wherein the divider extends from a first location on an inner surface of the second section to a second location on the inner surface of the second section. 4. The apparatus of claim 1, wherein one or more edges of the at least one plate are disposed within one or more guides, wherein each of the one or more guides comprises two or more parallel plates protruding from the inner surfaces of the first section, an inner surface of the second section, or both, and wherein the one or more guides are configured to align the divider within the first and second sections. 5. The apparatus of claim 1, wherein the at least one plate comprises a first plate disposed transverse to a second plate. 6. The apparatus of claim 1, wherein the divider comprises four plates disposed radially from the pipe to one of: (i) a location adjacent to an inner surface of the first section, (ii) to a location adjacent to an inner surface of the second section, and wherein the pipe is approximately centered within the housing. 7. The apparatus of claim 1, wherein the at least one fluid distribution conduit is positioned to direct air along a horizontal edge of the at least one plate, the horizontal edge being disposed in the second section. 8. The apparatus of claim 1, wherein the divider includes a plurality of plates extending from the pipe, each plate being disposed at least partially within the first section and the second section of the housing, wherein each plate has at least one tapered surface disposed adjacent to the at least one tapered sidewall of the second section. 9. The apparatus of claim 1, wherein the divider centers the pipe in the housing and the is pipe supported in the internal volume by one of (i) a hanger disposed in the upper section, and (ii) a support disposed in the upper section. 10. The apparatus of claim 1, further comprising a guide disposed on the sidewall of the second section and supporting the at least one plate.