An exhaust treatment system for a work vehicle , the system including a selective catalytic reduction (SCR) system configured to react a mixture of exhaust reductant and engine exhaust with a catalyst to generate a treated exhaust flow, the SCR system including an SCR outlet for expelling the treated exhaust flow therefrom, the system further including a flow conduit in fluid communication with the SCR outlet for receiving the treated exhaust flow expelled from the SCR system , and an exhaust sensor positioned within the flow conduit downstream of the SCR outlet , the exhaust sensor being configured to detect an amount of an emission gas present in the treated exhaust flow, the system being characterized by : a flow mixer positioned upstream of the exhaust sensor , the flow mixer comprising: an end wall defining sector openings extending in a circumferential direction (CD1) of the flow mixer between a first sector side and a second sector side and in a radial direction (R1) of the flow mixer between a radially inner sector end and a radially outer sector end ; and a plurality of swirler vanes , each of the plurality of swirler vanes extending in the circumferential direction (CD1) from the first sector side of a respective one of the sector openings and in the radial direction (R1) between a radially inner vane end and a radially outer vane end , the radially outer vane end of each of the plurality of swirler vanes being spaced apart in the radial direction (R1) from the radially outer sector end of the respective one of the sector openings , wherein the plurality of swirler vanes is configured to impart a spiraling flow trajectory to the treated exhaust flow flowing from the SCR to the exhaust sensor . a flow mixer positioned upstream of the exhaust sensor , the flow mixer comprising: an end wall defining sector openings extending in a circumferential direction (CD1) of the flow mixer between a first sector side and a second sector side and in a radial direction (R1) of the flow mixer between a radially inner sector end and a radially outer sector end ; and a plurality of swirler vanes , each of the plurality of swirler vanes extending in the circumferential direction (CD1) from the first sector side of a respective one of the sector openings and in the radial direction (R1) between a radially inner vane end and a radially outer vane end , the radially outer vane end of each of the plurality of swirler vanes being spaced apart in the radial direction (R1) from the radially outer sector end of the respective one of the sector openings , an end wall defining sector openings extending in a circumferential direction (CD1) of the flow mixer between a first sector side and a second sector side and in a radial direction (R1) of the flow mixer between a radially inner sector end and a radially outer sector end ; and a plurality of swirler vanes , each of the plurality of swirler vanes extending in the circumferential direction (CD1) from the first sector side of a respective one of the sector openings and in the radial direction (R1) between a radially inner vane end and a radially outer vane end , the radially outer vane end of each of the plurality of swirler vanes being spaced apart in the radial direction (R1) from the radially outer sector end of the respective one of the sector openings , wherein the plurality of swirler vanes is configured to impart a spiraling flow trajectory to the treated exhaust flow flowing from the SCR to the exhaust sensor . <EOS>