|
|
|
" Real Time Three-Dimensional Tomography and the Discrete Computations for Multiphase Flow Systems " This presentation will discuss a new image reconstruction scheme based on the neural network multi-criterion optimization approach for an application of electric capacitance tomography (ECT) to multiphase flow research. Comparisons of the ECT measurements with other non-intrusive techniques, such as particle imaging velocimetry, are made which validate the accuracy of the image reconstruction scheme developed for the ECT. The ECT is applied to explore flow structures of complex multiphase flow systems such as gas-liquid bubble columns and gas-solid and gas-liquid-solid fluidized beds. In a parallel study, a discrete computation is conducted based on the level-set technique which accounts for such free surface variations as those characterized by gas bubble motion in liquid or liquid droplet deformation upon impact with a particle. The volume-averaged Navier-Stokes equation and the Lagrangian formulation are used to describe the motion of liquid phase and particles, respectively. Results of the discrete computation for gas-liquid-solid fluidization and liquid droplet collisions with a particle under the film-boiling regime are presented. Comparisons of the computation results with the ECT results are also made. |