Abstract
Jet flow in a mixing vessel equipped with a nozzle rotating around an inner shaft which has the same axis as the vessel was visualized with a tracer technique. The expanding jet angle was measured to be 21°–24° regardless of the jet flow rate. The effects of the angle, rotating speed and direction of rotation of the nozzle on the flow pattern was observed, and the relation of flow pattern to mixing time was evaluated in reference to the measured mixing time reported in our previous paper. The minimum dimensionless mixing time occurred when the streak line of the jet turned smoothly from the radial direction to the tangential one by the rotation of the inner shaft, without impingement of the jet on the vessel wall.To estimate the flow pattern under optional conditions, a correlation equation of the streak line of the jet was derived theoretically from the differential equations of the radial and tangential velocity components of the jet.
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