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The purpose of the present study is to observe the effect of the blade attack angle on the roll and trailing vortex structures in a stirred vessel via laser-Doppler velocimetry (LDV). In this investigation, four-bladed paddle impellers with four attack angles, which were 45∘, 60∘, 75∘ and 90∘, respectively, were used. By synchronizing LDV with a rotary encoder coupled to the impeller shaft, angle-resolved...
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