Hydrodynamic Performance of a Ring‐Style High‐Shear Impeller in Newtonian and Shear‐Thinning Fluids,Chemical Engineering & Technology

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Hydrodynamic Performance of a Ring‐Style High‐Shear Impeller in Newtonian and Shear‐Thinning Fluids
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2020-08-28 , DOI: 10.1002/ceat.201900569
Román Guadarrama-Pérez ₁ , Valaur E. Márquez-Baños ₂ , Aarón D. De La Concha-Gómez ₁ , José J. Valencia-López ₃ , Alejandra Vengoechea-Pimienta ₄ , Gastón Martínez de Jesús ₅ , Jorge Ramírez-Muñoz ₆

Affiliation

Laminar mixing of Newtonian and shear‐thinning fluids induced by a Hockmeyer®‐type impeller was investigated. Two unbaffled tanks at three impellers off‐bottom clearances (c) were studied. Six geometric combinations, i.e., two d/T and three c/T, were examined where d and T are the impeller and tank diameters, respectively. Determination of the Metzner‐Otto constant (K_s) was undertaken. The effects of d/T, c/T, and fluid rheology on K_s, power demand, pumping, shear and viscous dissipation were analyzed. The evaluated geometric ratios and rheology do not significantly affect K_s and power demand, only the rheology had an impact on the remaining hydrodynamic parameters. Pumping was favored with the Newtonian fluid, and shear and viscous dissipation increased with the shear‐thinning fluid.

中文翻译：

环形高剪切叶轮在牛顿流体和剪切稀化流体中的流体力学性能

研究了由Hockmeyer®型叶轮引起的牛顿流体和剪切稀化流体的层流混合。研究了三个叶轮底部间隙（c）处的两个无挡板的水箱。检查了六个几何组合，即两个d / T和三个c / T，其中d和T分别是叶轮直径和水箱直径。进行了Metzner-Otto常数（K _s）的测定。的效果d / T，C / Ť上，并且流体流变学ķ_小号，分析了功率需求，抽运，剪切和粘性耗散。评估的几何比和流变性不会显着影响K _s和功率需求，仅流变性会影响其余的流体动力学参数。牛顿流体有利于泵送，而剪切稀化流体则增加了剪切力和粘性耗散。

更新日期：2020-10-20

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