System and method for mixing of fluids

An aftertreatment system housing comprising:

• an exhaust inlet configured to receive an exhaust flow;
• a Selective Catalytic Reduction (SCR) module disposed within the housing, wherein the SCR module is configured to introduce a reductant into the exhaust flow;
• a nitrogen oxide sensor disposed downstream of the SCR module, the nitrogen oxide sensor configured to measure a nitrogen oxide content of the exhaust flow exiting the housing;
• an exhaust outlet configured to emit the exhaust flow out of the housing;
• and
• a mixing element disposed between the SCR module and the nitrogen oxide sensor, the mixing element being disposed in fluid communication with the exhaust outlet, wherein the mixing element is configured to substantially homogenize the exhaust flow upstream of the nitrogen oxide sensor, the mixing element comprising:
• a base plate having an upper surface and a lower surface, the base plate configured to deflect a portion of a flow of a fluid around the upper surface thereof;
• and
• a plurality of vanes attached to the lower surface of the base plate, the plurality of vanes being provided in a spaced apart arrangement, wherein the plurality of vanes is configured to induce a swirling effect in a flow of the fluid received therebetween.