Print Email Facebook Twitter Improvement of the Richardson-Zaki liquid-solid fluidisation model on the basis of hydraulics (PPT) Title Improvement of the Richardson-Zaki liquid-solid fluidisation model on the basis of hydraulics (PPT) Author Kramer, O.J.I. (TU Delft Sanitary Engineering; Hogeschool Utrecht; Waternet) Date 2018 Abstract One of the most popular and frequently used models for describing homogeneous liquid-solid fluidised suspensions is the model developed by Richardson & Zaki in 1954. The superficial fluid velocity and terminal settling velocity together with an index, make it possible to determine the fluid porosity in a straightforward way. To maintain optimal process and control conditions in multiphase drinking water treatment processes, the porosity is kept relatively low. Unfortunately, the Richardson-Zaki index models tend to overestimate the minimum fluidisation velocity and therefore also result in less accurate predictions with respect to porosity values. We extended the Richardson-Zaki model with proven hydraulics-based models. The proposed models are compared with data from expansion experiments with grains applied in drinking water softening using the fluidised bed process. The porosity prediction error decreases from 15% to 3% and the minimum fluidisation velocity error from 100% to 12%. To reference this document use: http://resolver.tudelft.nl/uuid:2e4a753a-9c8a-4768-bbfc-8093c443ae01 Event 16th Multiphase Flows conference and shore course, 2018-11-13 → 2018-11-16, HZDR Dresden , Dresden, Germany Part of collection Institutional Repository Document type other Rights © 2018 O.J.I. Kramer Files PDF 181115_Presentation_18101 ... Kramer.pdf 4.98 MB Close viewer /islandora/object/uuid:2e4a753a-9c8a-4768-bbfc-8093c443ae01/datastream/OBJ/view