Exhaust aftertreatment assembly with a mixer having a mixing plate that is crescent shaped

An exhaust aftertreatment assembly comprising:

• a tubular conduit including a central axis;
• and
• a mixer disposed in the tubular conduit, the mixer comprising:
• a crescent shaped first mixing plate including:
• a first plate convex edge attached to the tubular conduit, and
• a first plate concave edge that intersects the first plate convex edge at a first plate first point and a first plate second point;
• and
• a crescent shaped second mixing plate including:
• a second plate convex edge attached to the tubular conduit, and
• a second plate concave edge that intersects the second plate convex edge at a second plate first point and a second plate second point;
• wherein a first plane in which the first mixing plate extends and a second plane in which the second mixing plate extends are oblique to the central axis such that the first plane intersects the second plane inside of the tubular conduit.