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Characterization of mixing in a simple paddle mixer using experimentally derived velocity fields

Bohl, D, Mehta, A, Santitissadeekorn, N and Bollt, E (2011) Characterization of mixing in a simple paddle mixer using experimentally derived velocity fields Journal of Fluids Engineering, Transactions of the ASME, 133 (6).

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The flow field in a cylindrical container driven by a flat bladed impeller was investigated using particle image velocimetry (PIV). Three Reynolds numbers (0.02, 8, 108) were investigated for different impeller locations within the cylinder. The results showed that vortices were formed at the tips of the blades and rotated with the blades. As the blades were placed closer to the wall the vortices interacted with the induced boundary layer on the wall to enhance both regions of vorticity. Finite time lyapunov exponents (FTLE) were used to determine the lagrangian coherent structure (LCS) fields for the flow. These structures highlighted the regions where mixing occurred as well as barriers to fluid transport. Mixing was estimated using zero mass particles convected by numeric integration of the experimentally derived velocity fields. The mixing data confirmed the location of high mixing regions and barriers shown by the LCS analysis. The results indicated that mixing was enhanced within the region described by the blade motion as the blade was positioned closed to the cylinder wall. The mixing average within the entire tank was found to be largely independent of the blade location and flow Reynolds number. © 2011 American Society of Mechanical Engineers.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mathematics
Authors :
Bohl, D
Mehta, A
Bollt, E
Date : 27 June 2011
DOI : 10.1115/1.4004086
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:20
Last Modified : 10 Jun 2019 13:01

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