Next Article in Journal
TiO2 Assisted Photodegradation for Low Substrate Concentrations and Transition Metal Electron Scavengers
Previous Article in Journal
Controlling the Synthesis Conditions for Tuning the Properties of Hydrotalcite-Like Materials at the Nano Scale
Article Menu

Export Article

Open AccessArticle
ChemEngineering 2018, 2(3), 32; https://doi.org/10.3390/chemengineering2030032

Experimental and CFD Studies of the Hydrodynamics in Wet Agglomeration Process

1
Department of Process Engineering, Stellenbosch University, Banghoek & Bosman Road, Stellenbosch 7600, South Africa
2
Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
*
Author to whom correspondence should be addressed.
Received: 28 May 2018 / Revised: 2 July 2018 / Accepted: 10 July 2018 / Published: 19 July 2018
Full-Text   |   PDF [7838 KB, uploaded 19 July 2018]   |  

Abstract

In this study, an experimentally validated computational model was developed to investigate the hydrodynamics in a rotor-stator vortex agglomeration reactor RVR having a rotating disc at the centre with two shrouded outer plates. A numerical simulation was performed using a simplified form of the reactor geometry to compute the 3-D flow field in batch mode operations. Thereafter, the model was validated using data from a 2-D Particle Image Velocimetry (PIV) flow analysis performed during the design of the reactor. Using different operating speeds, namely 70, 90, 110, and 130 rpm, the flow fields were computed numerically, followed by a comprehensive data analysis. The simulation results showed separated boundary layers on the rotating disc and the stator. The flow field within the reactor was characterized by a rotational plane circular forced vortex flow, in which the streamlines are concentric circles with a rotational vortex. Overall, the results of the numerical simulation demonstrated a fairly good agreement between the Computational Fluid Dynamics (CFD) model and the experimental data, as well as the available theoretical predictions. The swirl ratio β was found to be approximately 0.4044, 0.4038, 0.4044, and 0.4043 for the operating speeds of N = 70, 90, 110, and 130 rpm, respectively. In terms of the spatial distribution, the turbulence intensity and kinetic energy were concentrated on the outer region of the reactor, while the circumferential velocity showed a decreasing intensity towards the shroud. However, a comparison of the CFD and experimental predictions of the tangential velocity and the vorticity amplitude profiles showed that these parameters were under-predicted by the experimental analysis, which could be attributed to some of the experimental limitations rather than the robustness of the CFD model or numerical code. View Full-Text
Keywords: wet agglomeration; flocculation; hydrodynamics; turbulence wet agglomeration; flocculation; hydrodynamics; turbulence
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Oyegbile, B.; Akdogan, G.; Karimi, M. Experimental and CFD Studies of the Hydrodynamics in Wet Agglomeration Process. ChemEngineering 2018, 2, 32.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
ChemEngineering EISSN 2305-7084 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top