Designs of Rotary Devices Described in Scientific Literature

1 Designs of Rotary Devices Described in Scientific Literature 

Rotary devices are generally used to apply centrifugal and shear forces to foam to produce film rupture. As we discuss in Section 7.2.2, understanding of precisely how 

Deshpande and Barigou [14] have tabulated a useful summary of the many published empirical studies of defoaming using various rotary devices. In Appendix 7.1, Table 7.A1, we produce an updated version of that table where later studies are included and an error in a citation is rectified. Whether performance has been studied in either bubble colunms or stirred vessels is indicated. Most of the reported studies are at laboratory scale, concerned with controlling the foam of dilute aqueous surfactant solutions in sparged vessels of 0.5 m diameter. Only two reported studies concern pilot scale with practical systems—Kraft (paper) mill effluent [15] and recombinant Bacillus fermentation [16]. 

FIGURE 7.2 Designs of rotary foam breakers, (a) Six-blade turbine, (b) Six-blade vaned disc, (c) Two-blade paddle. (From Takesono, S., Onodera, M., Ito, A., Yoshida, M., Yamagiwa, K., Ohkawa, A., J. Chem. Technol. Biotechnol. 2003. 78. 48. Copyright Wiley-VCH Verlag GmbH Co. KGaA. Reproduced with permission.) 

---