Abstract
Axial velocity fluctuation zone (AVFZ) is a transition region between primary vortices in hydrocyclones that may influence the separation process, but its flow pattern and functions are not fully understood yet. This study focuses on the flow field characteristics of AVFZ using physical and numerical methods to reveal the flow pattern from a novel perspective. Based on the approximate scope of AVFZ outlined by LDA, RSM and LES models were used to compare the time-averaged and instantaneous flow fields within the AVFZ, revealing that the latter is more effective at capturing its essence. The AVFZ is characterized by substantial secondary vortices with an approximate extent where the LZVV oscillates. Finally, a mathematical definition for the AVFZ is proposed along with analyses of its spatial and flow rate distributions. The results demonstrated that the AVFZ is inevitable and occupies such a large separation space that is bound to affect separation process.
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