Channeled reductant mixing device

An impingement device, comprising:

• an impingement pin and a device body, the device body being coaxial with a longitudinal axis of the impingement pin, and being disposed at a distal end of the impingement device,
• wherein the impingement pin comprises a convex surface disposed at a proximal end of the impingement device, and
• wherein the device body comprises:
• a first surface;
• a second surface opposite the first surface;
• a plurality of inner channels connecting the first surface and the second surface, the plurality of inner channels being disposed in a first circular array at a first radial distance from the longitudinal axis of the impingement pin;
• and
• a plurality of outer channels connecting the first surface and the second surface, the plurality of outer channels being disposed in a second circular array at a second radial distance from the longitudinal axis of the impingement device, the first radial distance being less than the second radial distance.

An exhaust system, comprising:

• an exhaust pipe configured to receive exhaust from an engine;
• a compressed air source;
• a reductant source;
• and
• a nozzle fluidly connected with the exhaust pipe, the nozzle being configured to receive compressed air from the compressed air source and reductant from the reductant source, the nozzle having a nozzle body and an impingement device disposed within the nozzle body, the nozzle body comprising:
• a proximal end defining a first inlet and a second inlet that is distinct from the first inlet, an axis of the first inlet being disposed parallel to a longitudinal axis of the nozzle, an axis of the second inlet being disposed at an angle perpendicular to the longitudinal axis of the nozzle;
• a distal end disposed opposite the proximal end along the longitudinal axis of the nozzle, the distal end comprising an outlet defining a plurality of outlet orifices therethrough;
• and
• an interior disposed between the proximal end and the distal end, the interior including:
• a fluid impingement chamber fluidly connected with the first inlet and the second inlet, and
• a mixing chamber,
• the impingement device comprising an impingement pin and an impingement device body extending radially outward from the impingement pin along a radial direction, the radial direction being transverse to the longitudinal axis of the nozzle,
• the impingement device body defining a plurality of impingement body orifices therethrough, the mixing chamber being fluidly coupled to the fluid impingement chamber via the plurality of impingement body orifices,
• the impingement pin extending away from the impingement device body along the longitudinal axis of the nozzle, the impingement pin including a convex surface disposed at an end of the impingement pin, wherein the convex surface is concentric with the longitudinal axis of the nozzle
• the plurality of outlet orifices being fluidly coupled with the plurality of impingement body orifices via the mixing chamber.