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impeller
First, the internal flow field of each impeller was calculated.
      
Second, the concurrent working point of each impeller was approximately estimated.
      
Finally, a calculation was performed considering the influence on each impeller.
      
Although both impellers had the same blade cross-section, one impeller had a two-dimensional blade, while the other had a leaned blade.
      
The average cavitation performance of each impeller was satisfactorily predicted by the numerical simulations.
      
The results show that the miniature pumps have similar cavitation performances as an ordinary-size pump, with the cavitation performance of the semi-open impeller reduced by increased axial tip clearances.
      
Also, both the hydraulic and cavitation performance of the semi-open impeller were improved by the leaned blade.
      
The results also show that uniform flow upstream of the impeller inlet will improve the cavitation performance of a miniature pump.
      
Minimum-drag cascade design for an "impeller-directing vanes-unchoked convergent nozzle" system
      
Effect of Impeller Blade Geometry on Drop Size in Stirring of Immiscible Liquids
      
The stirring of immiscible liquids is considered, and the effect of impeller geometry on the dynamic equilibration of the emulsion and on the maximum drop size is analyzed.
      
The dissipation rate of turbulent energy in the wake of an impeller blade is estimated.
      
The sound excitation inside a centrifugal pump by a source of pressure oscillations positioned in the inlet cross-section of the impeller is considered theoretically.
      
The specific feature of the problem formulation is that the blade channels and the channel between the impeller and the pump casing (the open diffuser) are considered as a single acoustic system.
      
Cavitation may cause three different and undesirable effects: (1) a drop in head-capacity and efficiency curves, (2) damage to the impeller by pitting and erosion, and (3) structure vibration and resulting noise.
      
The effect of a radially nonuniform steady-state liquid flow in the outlet of a centrifugal pump on the excitation of sound waves in it by a source of oscillations positioned in the inlet cross section of the impeller is analyzed.
      
The angle β2 at which the flow of liquid leaves the centrifugal pump impeller is optimized.
      
A column, made from permanent magnet, is jointed to an impeller in a concentric way to form a "rotor-impeller".
      
Supported by a hanging shaft cantilevered in the center of a rigid cage, the rotor-impeller can be turned by the magnetic field in the surrounding space.
      
In the present prototype, the rotor is 8 mm in diameter and 15 mm in length, the impeller has 3 vanes with an outer diameter of 18 mm.
      
 

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