Abstract
Hydroabrasion in particulate flows plays an important role in various industrial and natural processes. To predict the effects of particulate flow and the resulting phenomena such as erosion/abrasion in a pipeline, channel or a fitting, it is essential to characterize the effects in a simple standardized geometry. For this purpose, it is vital to initially understand the particulate flow behavior and motion in such geometries. In the present work, two series of experimental works by application of the LDA measurement technique were successfully conducted. First, the particulate flow behavior at downstream of a flow conditioner inside a channel with square cross-section was investigated. Shorter lengths for fully development of velocity profile by using the self-constructed flow conditioner were observed. Moreover, the flow at downstream of the conditioner was modeled with the CFD tool (ANSYS-CFX V. 14.57) and the simulation results were compared and validated by the LDA experimental data. Better agreement between the simulation results and experimental data was observed in the fully developed region. However, there are some deviations due to the actual pressure loss through the experimental loop and the calculated pressure loss value, which includes some assumptions for the loss coefficients. Furthermore, the particulate flow behavior and vortex generation inside the deformed locations of a channel surface were studied in detail. With the help of the Matlab program, it was possible to calculate and visualize the velocity vectors for each measured point inside the channel accurately.
Highlights
Particulate flows are responsible for accelerated erosion/abrasion in pipelines and plant equipment, which canHow to cite this paper: Azimian, M. and Bart, H.-J. (2015) LDA Study of Particulate Flow in a Channel with Deformed Surface Locations and with Flow Conditioner
For the second series of the LDA experiments, the particulate flow behavior and vortex generation inside the deformed locations of a channel surface were studied in detail
In the case of abrasive solid particles presence in the flow, the particles can rotate in such vortex fields multiple times and can have multi impacts with the surface
Summary
Particulate flows are responsible for accelerated erosion/abrasion in pipelines and plant equipment, which can. Azimian et al [7] have recently measured the velocity profiles of solid particles and the deviation compared to the liquid phase, velocity fluctuations and the particles size distribution with LDA/PDA technique for solid-liquid flows in a channel with an obstacle positioned perpendicular to the flow direction. The effects of a flow conditioner on the flow behavior (velocity and turbulence profiles) in a channel were experimentally and numerically investigated. The velocity profiles were measured by three various volumetric feed flows at different axial locations with and without installation of the flow conditioner. 50 mm - 100 mm 100 mm - 150 mm 150 mm - 200 mm 200 mm - 250 mm 250 mm - 300 mm 300 mm - 350 mm 350 mm - 400 mm Without flow conditioner
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