BibTex format
@article{Sommer:2020:10.1016/j.mineng.2020.106410,
author = {Sommer, A-E and Ortmann, K and Van, Heerden M and Richter, T and Leadbeater, T and Cole, K and Heitkam, S and Brito-Parada, PR and Eckert, K},
doi = {10.1016/j.mineng.2020.106410},
journal = {Minerals Engineering},
pages = {1--10},
title = {Application of Positron Emission Particle Tracking (PEPT) to measure the bubble-particle interaction in a turbulent and dense flow},
url = {http://dx.doi.org/10.1016/j.mineng.2020.106410},
volume = {156},
year = {2020}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - In a flotation cell, turbulence influences the motion of solid particles relative to the bubble surface, and, thus,affects the recovery rate. But, the impact of turbulence on the probability of a bubble-particle aggregationis still difficult to measure, especially in a dense flow. Therefore, the focus of this work was to applyPositron Emission Particle Tracking (PEPT) as a method to investigate the effect of turbulence on theparticle movement and bubble-particle interaction in an opaque flow. Single air bubbles (db = 2.5 mm) weregenerated on a needle in a water flow channel. Upstream, a grid produced an isotropic turbulent flow with5 % to 15 % turbulence intensity and a Kolmogorov microscale of 20 µm. Depending on the distance to thegrid, the flow near the captive bubble (Reb ≈ 450) was characterized by eddies of different length scalesand magnitude with tomographic Particle Image Velocimetry (PIV). The solid suspension contained up to0.3 % polymethylmethacrylate (PMMA) particles (dp = 200 µm–400 µm) and up to six radiolabelled particles(dp = 300 µm–400 µm) coated with PMMA. The trajectories of the labelled particles were used to determinethe average particle distribution in the turbulent field and describe the bubble-particle interactions. Theseresults provide valuable information on the applicability of PEPT in turbulent and dense flow fields as wellas on particle trajectories close to bubbles, enhancing our understanding of key flotation phenomena.
AU - Sommer,A-E
AU - Ortmann,K
AU - Van,Heerden M
AU - Richter,T
AU - Leadbeater,T
AU - Cole,K
AU - Heitkam,S
AU - Brito-Parada,PR
AU - Eckert,K
DO - 10.1016/j.mineng.2020.106410
EP - 10
PY - 2020///
SN - 0892-6875
SP - 1
TI - Application of Positron Emission Particle Tracking (PEPT) to measure the bubble-particle interaction in a turbulent and dense flow
T2 - Minerals Engineering
UR - http://dx.doi.org/10.1016/j.mineng.2020.106410
UR - https://www.sciencedirect.com/science/article/pii/S0892687520302302?via%3Dihub
UR - http://hdl.handle.net/10044/1/79637
VL - 156
ER -