1. Numerical and CFD-Based Modelling of Concentrated Domestic Slurry in Turbulent Flow Through Circular Pipes
- Author
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Mehta, D., Thota Radhakrishnan, A.K., van Lier, J.B., Clemens, F.H.L.R., and Mannina, Giorgio
- Subjects
Petroleum engineering ,Turbulence ,business.industry ,Flow (psychology) ,Herschel–Bulkley fluid ,Computational fluid dynamics ,Law of the wall ,Urban drainage ,Non newtonian flow ,Newtonian fluid ,Slurry ,Environmental science ,Non-Newtonian flow ,Herschel-Bulkley fluid ,Concentrated domestic slurry ,business - Abstract
The concentration of domestic slurry has two advantages, it promotes resource recovery (nutrients and biomass) and saves water. But the design of a relevant sewerage requires a clear understanding of the frictional losses incurred during the transport of the slurry. This abstracts describes numerical & CFD-based methods to estimate losses while the concentrated slurry flows through circular pipes in a fully-turbulent flow. To model turbulent flows through circular pipes, one can rely on either the Newtonian Moody Charts appropriate for engineering applications or a computational fluid dynamics (CFD)-based analysis, made possible through the Newtonian universal law of the wall. However, our studies reveal that concentrated domestic slurry behaves like a non-Newtonian fluid, of the Herschel-Bulkley type. Therefore, the analysis of such a slurry would require modifications to both, existing engineering models and CFD methods. This abstract summarises a modified law of the wall suitable for Herschel-Bulkley fluids, which has been validated against experiments on concentrated domestic slurry. It further details possible non-Newtonian numerical engineering models that could be modified to assess frictional losses incurred by Herschel-Bulkley fluids. The latter will be a quicker and perhaps reliable alternative to computationally expensive CFD-analyses.
- Published
- 2018