Download E-books Numerical and experimental investigations of Newtonian and non-Newtonian flow in Annular Gaps with Spraper Blades PDF

By Stranzinger M.

This paintings offers numerical and experimental investigations of slender annular hole flows utilizing an gear with an internal cylinder as rotor, with connected scraper blades, and an outer cylinder actin g as stator (with a rotor/stator cylinder ratio of 0.8). functions in are Barrow hole - scraped floor beat exchangers (NG-SSHE) or slim hole - shear crystallizers (NC-SC) built via the Laboratory of nutrition approach Engineering at ETH Ziirich. slender annular hole equipment with wall scraping instruments are the root of a newtype of constant reactor precept for the mechanical and thelmaI therapy of fluid structures. This precept combines some great benefits of slender mechanical rigidity distribution, slender place of dwelling time distribution, optimized "thin layer" warmth and mass transfer.A finite quantity process (FVM; the numerical half) and a digital-particle snapshot velocimetry technique (D-PIV; the experimental half) are hired within the research. quite a few rotor velocities represented via a rotational Reynolds quantity (parameter Re) and numerous scraper blade angles among 30º and 150º (parameter ) are thought of for Newtonian and inelastic non-Newtonian shear-thinning fluids (modelled with power-law exponents among n=0.2 and 1.0).Two-ditnensional numerical stream simulations in a attribute axial go sectional airplane are in comparison to experimentally precipitated two-dimensional speed fields measured with DPIV in an annular hole reactor (AGR, built by means of the Laboratory of nutrients procedure Engineering at ETH Z;iirich) as a functionality of the selected parameters Re, and n. The comparisons are in solid contract. A numerical particle monitoring strategy (NPT) is used to additional study the movement fields made out of the simulations.Based at the gathered circulation fields, for varied approach parameters Re, and n, the mechanisms which impression the macroscopic movement structuring behaviour of viscous fluid structures with regards to foodstuff purposes are mentioned. those comprise the hydrodynamic strain, secondary flows, non-Newtonian viscosity, shear tension, power dissipation and anisotropic circulate structuring deformation behaviour because of natural elongational and natural shear pressure (E.e, move structuring deformations, stream structuring energies and native flowstructuring efficiencies).

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