Submerged jet shearing of visco-plastic sludge

We present a well-resolved numerical analysis of submerged jet mixing (sludge recirculation) of municipal sludge. Using an augmented Lagrangian algorithm, we accurately identify the position of true inactive unmixed regions. The analysis includes inertial and viscoplastic effects in laminar flow reg...

Full description

Saved in:
Bibliographic Details
Published in:Journal of non-Newtonian fluid mechanics 2018-02, Vol.252, p.19-27
Main Authors: Maleki, A., Hormozi, S.
Format: Article
Language:English
Subjects:
Algorithms
Laminar flow
Nozzles
Numerical analysis
Shearing
Sludge
Submerged jets
Yield strength
Yield stress
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a well-resolved numerical analysis of submerged jet mixing (sludge recirculation) of municipal sludge. Using an augmented Lagrangian algorithm, we accurately identify the position of true inactive unmixed regions. The analysis includes inertial and viscoplastic effects in laminar flow regimes. We find that inertial mixing flows are more effective in mobilizing sludge when they mix sludge that has a small yield stress. For sludge with a high yield stress, we offer other means to reduce or even fully eliminate the inactive unmixed regions, which rely on redesigning the shape of digester tank. In addition, we look at the effect of nozzle diameter and position on the efficiency of mixing.
ISSN:0377-0257
1873-2631
DOI:10.1016/j.jnnfm.2017.12.006