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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-483-0

ISBN Online: 978-1-56700-482-3

4th Thermal and Fluids Engineering Conference
April, 14–17, 2019 , Las Vegas, NV, USA

CFD SIMULATION OF 90° PIPE BEND FOR MULTIPHASE FLOW OF ZINC TAILING-WATER SLURRY

Get access (open in a dialog) pages 1507-1517
DOI: 10.1615/TFEC2019.nmf.027203

Аннотация

The present study is focused on the slurry flow of mono-dispersed particles through pipe bend at high concentrations using CFD technique. The geometry of pipe bends is varied by modifying the R/d ratio (1.0-3.0). Numerical simulations are carried out by using the Eulerian multiphase model. The modeling results are validated with experimental data. The Standard k-ε model shows a most appropriate comparison with experimental results and hence used in the further investigation. The hexagonally shaped cooper type three dimensional non-uniform grid is chosen to discretize the entire domain. The mesh is refined at the boundaries so as to achieve the y+ value to 30. The contours of turbulence intensity, volume fraction and flow velocity are obtained at the various locations of bend geometry that have never been measured experimentally at such higher concentrations. The solid concentration is varied in the range of 25-55% for flow velocity range of 2-5 m/s. The pressure drop is found to be minimum for bend having R/d ratio 2.0 for low flow rates. For high flow rates pipe bend having R/d ratio 2.5 is optimum. From the results, it is observed that flow velocity dragged the solid particles from the bottom of the pipe along the outer periphery of bend wall. Also, from the velocity contours, it is revealed that an increase in flow velocity results in flow separation along the pipe bend. The increase in R/d ratio leads to suppression of secondary flows as well as reduce pressure drop.