Time scales, dispersed multiphase flows

APPENDIX 4.1. TIME SCALES FOR DISPERSED MULTIPHASE FLOWS (FROM PEIRANO AND LECKNER, 1998)... 

During the last years tomography has obtained intensive research to characterise multiphase flows (Fransolet et al. 2001). EIT is a non-invasive technique that applies to opaque dispersions. In EIT experiments resistivities are measured between the electrodes that cover the part of the walls of the vessel. The continuous phase must be conductive and the difference in conductivity between the continuous phase and the dispersed phase must be distinct. The resistivity distributions are reconstructed to produce three-dimensional images of the resistivity field. Tomography techniques are relatively slow compared to the time scale of flow in a mixed tank so it is not suitable for the determination of BSDs. 

---