Journal
POWDER TECHNOLOGY
Volume 392, Issue -, Pages 619-631Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2021.07.052
Keywords
Hydraulic conveying; Bend; Wear; Pressure drop; CFD-DEM
Categories
Funding
- Australian Research Council (ARC) [IH140100035, LP160100819]
- Australian Research Council [LP160100819] Funding Source: Australian Research Council
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This paper presents a numerical study of hydraulic bends in a conveying pipeline system, focusing on the interaction between pipe orientation and flow regime. The results show significant differences in pressure drop and erosion rate for different pipe orientations and conveying speeds. Among the three simulated pipe orientations, the inclined bend performs the best under various flow regimes, with minimal impact from pressure drop, pressure fluctuation, and erosion rate.
Bends are potentially most problematic in a hydraulic conveying pipeline system. This paper presents a numerical study of hydraulic bends, with special reference to the interaction between pipe orientation and flow regime. This is done by the combined approach of computational fluid dynamics and discrete element method facilitated with a wear model. The validity of the model has been verified by comparing the measured and predicted flow properties and erosion depth. On this basis, three pipe orientations: 0 degrees (i.e. horizontal-vertical bend), 45 degrees (i.e. inclined bend), and 90 degrees (i.e. vertical-horizontal bend) are simulated for the conveying speeds of 1.2 m/s, 2.0 m/s and 4.0 m/s. It covers typical flow regimes in a horizontal pipe. Via the simulation outputs, the bend performance is assessed in terms of pressure loss, conveying instability and bend erosion. The results reveal that the pressure drop and erosion rate differ for various pipe orientations and conveying speeds involving different flow regimes. The acceleration/de-acceleration of the particles exiting the bend does not result in a significant additional pressure. The vertical-horizontal bend has low erosion rates benefiting from cluster formation and low pressure, which is not the case at high conveying speeds. By contrast, the inclined bend gives the highest elevation height and does not suffer significant pressure drop, pressure fluctuation, and erosion rate under all the flow regimes considered. (c) 2021 Elsevier B.V. All rights reserved.
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