Gas/liquid mixing device for diesel exhaust aftertreatment

An exhaust gas treatment system for an internal combustion engine comprising:

• an exhaust gas conduit configured to receive exhaust gas from an exhaust port of an internal combustion engine and to deliver the exhaust gas downstream to a plurality of exhaust treatment devices comprising:
• a selective catalytic reduction device configured to reduce oxides of nitrogen in the exhaust gas;
• an injector bay extending outwardly from the exhaust gas conduit upstream of the selective catalytic reduction device;
• an exhaust fluid injector mounted through an opening in the injector bay, in fluid communication with the exhaust gas in the exhaust gas conduit, and oriented in an upstream direction to deliver an ammonia reductant to the downstream flowing exhaust gas in the upstream direction;
• and
• an exhaust flow baffle extending outwardly from the injector bay into the exhaust gas in an upstream direction, the exhaust flow baffle located upstream of the exhaust fluid injector and configured to define a turbulent, low pressure, low velocity field downstream thereof proximate to the exhaust fluid injector.