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Investigation on the flow characteristics of a novel multi‐blade combined agitator by time‐resolved particle image velocimetry and large eddy simulation
Author(s) -
Xu Yan,
Wu Bin,
Luo Peicheng
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16277
Subject(s) - agitator , particle image velocimetry , mechanics , microscale chemistry , turbulence , turbulence kinetic energy , axial compressor , large eddy simulation , velocimetry , flow (mathematics) , particle tracking velocimetry , materials science , physics , impeller , thermodynamics , mathematics , mathematics education , gas compressor
Abstract We investigated the flow characteristics in a tank of H / T = 1.5 stirred by a novel multi‐blade combined agitator (MBC) by using time‐resolved particle image velocimetry and large eddy simulation approach. The predictions were assessed by Y + values, Taylor microscale and power spectrum analysis, as well as experimental validation of velocity distributions. Results demonstrate that the MBC agitator can load the energy into the system effectively with a power number of 12.5 in a turbulent regime, resulting in improved axial and radial mass exchange. The upper and lower short blades produce an axial down‐flow in the top half and an axial up‐flow in the bottom half, respectively. Part of axial flows change to radial flows by the radial pumping of the long blades, meanwhile, the impingement of two axial flows improves the axial mass exchange. These flow characteristics lead to an obvious improvement in the turbulent kinetic energy distribution uniformity with higher turbulent intensity.