Abstract
A mixing performance of an inner baffle was investigated in shear thinning fluid. The inner baffle was placed with a clearance between baffle and vessel wall. A traditional two-bladed paddle impeller was used. Four planar baffles were vertically placed in two ways: 1) standard baffle condition 2) inner baffle condition. The standard baffle condition was that the baffle was placed on the mixing vessel wall. A mixing pattern was visualized by decolorization method based on an oxidation-reduction reaction with sodium thiosulfate and iodine. Flow field for shear thinning fluid in mixing vessel was measured by particle image velocimetry and was shown as stream line. A pair of isolated mixing regions (IMR) like doughnut-ring formed above and below the impeller under standard baffle condition. However, IMR dissipated under inner baffle condition. As a result, a mixing time under the inner baffle condition was drastically decreased. This study suggested that inner baffle promoted mixing in shear thinning fluid.
Highlights
Agitation and mixing are used in chemical, polymer and pharmaceutical industries
Laminar mixing using a traditional paddle impeller is difficult because an isolated mixing region (IMR) like doughnut-ring appears above and below the impeller (Metzner and Taylor, 1960; Lamberto et al, 1996)
In our previous study (Furukawa et al, 2018), we found that a baffle placed with a clearance between the baffle and the mixing vessel promoted laminar mixing in Newtonian fluid
Summary
Agitation and mixing are used in chemical, polymer and pharmaceutical industries. These industries sometimes treat high viscous Newtonian fluid and non-Newtonian fluid. In our previous study (Furukawa et al, 2018), we found that a baffle placed with a clearance between the baffle and the mixing vessel promoted laminar mixing in Newtonian fluid. We investigated an effect of the baffle placed with a clearance on mixing performance in shear thinning fluid. Pure Chemical Corporation) aqueous solution was used as shear thinning fluid in this study.
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