Journal of Fluid Science and Technology
Online ISSN : 1880-5558
ISSN-L : 1880-5558
Papers
Vortex Structures around a Flat Paddle Impeller in a Stirred Vessel
(Vortex Structures and Reynolds Stresses)
Shinsuke MOCHIZUKIKazumi SUZUKAWAKeisuke SAGAHideo OSAKA
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2008 年 3 巻 2 号 p. 241-249

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Vortex structures and Reynolds stresses around a flat paddle in a mixing vessel have been investigated experimentally by two-component LDV measurement. Phase-averaged mean velocity and Reynolds stresses were obtained to observe the relative relation between the vortical structures and momentum transport. Development of Reynolds shear stress can be recognized along with the separated shear layer released from a flat paddle. Discharge and inflow induced by the roll vortex affect the magnitude of Reynolds shear stress in the separated shear layer. A four-quadrant analysis was applied to find the turbulent motions contributing to the production of the Reynolds shear stress. Most of the Reynolds shear stresses were found to be produced by two turbulent motions, namely, inflow just behind the paddle and large-scale-motion passing from behind the paddle vertically. The two turbulent motions are closely associated with the roll vortex.

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© 2008 by The Japan Society of Mechanical Engineers
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