Print Email Facebook Twitter Two-phase modelling for sediment water mixtures above the limit deposit velocity in horizontal pipelines Title Two-phase modelling for sediment water mixtures above the limit deposit velocity in horizontal pipelines Author Schouten, T.D. (TU Delft Offshore and Dredging Engineering) van Rhee, C. (TU Delft Offshore and Dredging Engineering; TU Delft Rivers, Ports, Waterways and Dredging Engineering) Keetels, G.H. (TU Delft Offshore and Dredging Engineering) Date 2021 Abstract In dredging applications, deep sea mining and land reclamation projects typically large amounts of sediments are transported through pipes in the form of hyper concentrated (40% sediment or more) sediment-water mixtures or slurries. In this paper it is investigated how well a generic Euler-Euler CFD-model is capable to model velocity, concentration profiles and the pressure gradient of sediment above deposition limit velocity in a pipeline. This Euler-Euler solver treats both phases as a continuum with its own momentum and continuity equations. The full kinetic theory for granular flows is accounted for (no algebraic form is used) and is combined with a buoyant k-ε turbulence model for the fluid phase. The influence of the mesh size has been checked and grid convergence is achieved. All numerical schemes used are of second-order accuracy in space. The pressure gradient was calibrated by adjusting the specularity coefficient in one calibration case and kept constant afterwards. Simulations were carried out in a wide range of slurry flow parameters, in situ volume concentration (9–42%), pipe diameter (0.05–0.90 m), particle diameter (90–440 μm) and flow velocity of (3–7 m/s). The model shows satisfactory agreement to experimental data from existing literature. Subject CFDKinetic theorySlurry flowTwo-phase modelling To reference this document use: http://resolver.tudelft.nl/uuid:73d33882-7ed8-48f0-a41f-a1e5e634925e DOI https://doi.org/10.2478/johh-2021-0011 ISSN 0042-790X Source Journal of Hydrology and Hydromechanics (Vodohospodarsky Casopis), 69 (3), 263-274 Part of collection Institutional Repository Document type journal article Rights © 2021 T.D. Schouten, C. van Rhee, G.H. Keetels Files PDF 10.2478_johh_2021_0011.pdf 2.09 MB Close viewer /islandora/object/uuid:73d33882-7ed8-48f0-a41f-a1e5e634925e/datastream/OBJ/view