Patent ID: 8499548

Claim:
A flow device for an exhaust system comprising: a body including a first axial end and an oppositely disposed second axial end, the body defining an inlet port and an outlet port, the body having a central longitudinal axis and defining an interior cavity, the interior cavity including a transition space disposed adjacent to the second axial end; a first exhaust passage disposed in the interior cavity for directing exhaust out of the transition space, the first exhaust passage-being extending along the central longitudinal axis of the body; a second exhaust passage disposed in the interior cavity for directing exhaust into the transition space, the second exhaust passage-circumferentially surrounding at least a portion of the first exhaust-passage; a doser disposed at the second axial end of the body, the doser being adapted to inject reductants into the transition space of the body so that the reductants are injected in a direction that extends along the central longitudinal axis of the body; and a mixer disposed in the interior cavity adjacent to the second axial end of the body, the mixer being adapted to swirl exhaust gases within the transition space about the central longitudinal axis of the body.