Thanks to the advancements in computer power and capability of Computational Fluid Dynamics codes, the amount of research work on the numerical simulation of slurry flows in pipelines has increased exponentially in few years, opening the way to the use of this approach for engineering purposes. The Two Fluid Model (TFM), in which both phases are interpreted as interpenetrating continua and solved in the Eulerian, cell-based framework, allows the best compromise considering the engineering requirements of computational efficiency, applicability, and accuracy. However, the solution of this model is affected by several numerical and modelling factors, and, even if good agreement is achieved between simulation results and experimental measurements, it might be difficult to trust the predictions outside the validation conditions, thereby limiting the engineering potential of the two-fluid approach. The fully-suspended slurry flow in horizontal pipes was numerically simulated using the TFM recently developed by one of the authors of this paper, and the computational results were compared to experimental data reported in the literature. It has been clearly demonstrated that, even in this simple geometry, many possible sources of inaccuracy and uncertainty come into play. Whilst assessing their role, best practice guidelines and consistency checks were proposed to improve the accuracy of the estimates and increase the reliability of the TFM solution. Afterwards, pipe size-up scaling tests and a careful specification of the applicability conditions provided further confidence to the use of the TFM as a tool for engineering design.

Analysis and discussion of two fluid modelling of pipe flow of fully suspended slurry

Messa, Gianandrea Vittorio;Matoušek, Václav
2020

Abstract

Thanks to the advancements in computer power and capability of Computational Fluid Dynamics codes, the amount of research work on the numerical simulation of slurry flows in pipelines has increased exponentially in few years, opening the way to the use of this approach for engineering purposes. The Two Fluid Model (TFM), in which both phases are interpreted as interpenetrating continua and solved in the Eulerian, cell-based framework, allows the best compromise considering the engineering requirements of computational efficiency, applicability, and accuracy. However, the solution of this model is affected by several numerical and modelling factors, and, even if good agreement is achieved between simulation results and experimental measurements, it might be difficult to trust the predictions outside the validation conditions, thereby limiting the engineering potential of the two-fluid approach. The fully-suspended slurry flow in horizontal pipes was numerically simulated using the TFM recently developed by one of the authors of this paper, and the computational results were compared to experimental data reported in the literature. It has been clearly demonstrated that, even in this simple geometry, many possible sources of inaccuracy and uncertainty come into play. Whilst assessing their role, best practice guidelines and consistency checks were proposed to improve the accuracy of the estimates and increase the reliability of the TFM solution. Afterwards, pipe size-up scaling tests and a careful specification of the applicability conditions provided further confidence to the use of the TFM as a tool for engineering design.
Slurry flows
Two fluid model
Sensitivity analysis
Validation
Hydraulic conveying
File in questo prodotto:
File Dimensione Formato  
MessaMatousek_PT19_AAM_2.pdf

Accesso riservato

Descrizione: AAM
: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 1.22 MB
Formato Adobe PDF
1.22 MB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1129481
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 12
social impact