Mixer assembly

A mixer assembly for mixing an injected reductant with an exhaust gas output from a combustion engine, comprising:

• a tubular housing including a reductant inlet, an exhaust gas inlet and an exhaust gas outlet, the tubular housing defining a longitudinal axis along which the exhaust gas enters the housing, wherein the reductant inlet is positioned on a side of the tubular housing longitudinally between the exhaust gas inlet and the exhaust gas outlet;
• an upstream mixing element positioned within the tubular housing upstream from the reductant inlet;
• a downstream mixing element positioned within the tubular housing downstream from the reductant inlet and the upstream mixing element, wherein the upstream mixing element and the downstream mixing element at least partially define a reductant receiving mixing chamber in which the injected reductant and the exhaust gas mix;
• and
• a divider positioned within the tubular housing downstream from the upstream mixing element to split the exhaust gas into two divided flow streams prior to exiting through the exhaust gas outlet, wherein the divider includes a longitudinally extending ridge separating two concave surfaces.

A method of mixing an injected reductant with an exhaust gas output from a combustion engine, comprising;

• receiving exhaust gas in an exhaust gas inlet of a tubular housing;
• positioning an upstream mixing element within the tubular housing upstream from a reductant inlet of the tubular housing;
• positioning a downstream mixing element within the tubular housing downstream from the upstream mixing element and the reductant inlet, wherein the upstream mixing element and the downstream mixing element at least partially define a reductant receiving mixing chamber, the reductant inlet being positioned on a side of the tubular housing longitudinally between the exhaust gas inlet and an exhaust gas outlet;
• injecting reductant into the reductant receiving mixing chamber;
• positioning a divider within the tubular housing downstream from the upstream mixing element;
• directing the exhaust gas to flow radially within the tubular housing to impact the divider;
• splitting the exhaust gas into two divided flow streams as the exhaust gas flows over the divider;
• mixing the injected reductant with the exhaust gas;
• and
• outputting a mixture of exhaust gas and injected reductant through the exhaust gas outlet.