Effect of Blade Shape on the Performance of Six-Bladed Disk Turbine Impellers
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- 作者：Jorge M. T. Vasconcelos ; Sandra C. P. Orvalho ; Ana M. A. F. Rodrigues ; and Sebastiã ; o S. Alves
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2000
- 出版时间：January 2000
- 年：2000
- 卷：39
- 期：1
- 页码：203 - 213
- 全文大小：165K
- 年卷期：v.39,no.1(January 2000)
- ISSN：1520-5045
文摘
Different modifications of the Rushton turbine were studied in a dual-impeller agitated tank (T= 0.4 m), to find the effect of blade form on power draw, turbulent dispersion, gas handlingcapacity, mixing, gas holdup, and mass-transfer rate performance under turbulent agitation inan air-water system. Blade streamlining was found to lead to a lower ungassed power number,a higher gas flow number before flooding, and increased insensitivity of impeller power dissipationto the gassing rate. This is consistent with the formation of smaller trailing vortices andventilated cavities behind the blade. At the same power input and superficial gas velocity,however, the different impellers provided the same mixing time t0.05, gas holdup 
G, and specificmass-transfer coefficient KLa. Each of these variables correlates with the specific power inputPG/VL, clearly suggesting that a better performance may be expected after retrofitting of Rushtonturbines with streamlined impellers.
G, and specificmass-transfer coefficient KLa. Each of these variables correlates with the specific power inputPG/VL, clearly suggesting that a better performance may be expected after retrofitting of Rushtonturbines with streamlined impellers.