Abstract
To detect the cavities formed behind the impeller blades, the electrical resistivity tech-nique was employed in this study. The transition conditions between large cavity and clinging cavity were easily detected by the proposed method and the reliabilty of the probe was confirmed by the comparison with literature. The characterististics of the cavities were observed as a function of impeller rotational speed and air flow rate. As the air flow rates increase, the type of cavities are changed from clinging cavities to large cavities. Large cavities were not observed in behind the impeller blades at high impeller speeds. In the region of the formation of alternate large and clinging cavities, the shapes of cavities were not changed and the positions of cavities were rarely shifted to other positions.
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Abbreviations
- D:
-
impeller diameter [mm]
- N:
-
impeller rotational speed [rps]
- NFl :
-
gas flow number (Q/ND) [-]
- NFr :
-
Froude number (ND/g) [-]
- NRe :
-
Reynolds number (ρND2μ) [-]
- Q:
-
gas flow rate [m3/s]
- T:
-
tank diameter [mm]
- ΔtB :
-
time duration which each blade passes by the tip of probe [s]
- Δtc :
-
time duration which signal is detected [s]
- ΔtMAX :
-
time duration which maximum voltage is maintained [s]
- ΔVMAX :
-
maximum voltage change [volts]
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Lee, HR., Huh, YJ., Choi, CS. et al. Cavity formation in turbine stirred gas-liquid dispersion system. Korean J. Chem. Eng. 9, 164–168 (1992). https://doi.org/10.1007/BF02705134
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DOI: https://doi.org/10.1007/BF02705134