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Abstract. This research analyzes the influence of UREA SCR System's mixer. The simplified modeling was facilitated to interpret current exhaust system. ANSYS of commercial program was utilized to analyze the fluid effects. Parameters were set up of four variable at 1,000rpm from 1,000rpm to 4,000rpm and three models were used for the analysis. Low pressure was measured at the end-central part of the mixer since the pressure is distributed from the central axis and towards the outside. By assessing the degree of uniformity, the uniformity expanded faster at high RPM and in low RPM, the flux itself is low so the uniformity gradually increase as it reached the latter part.

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