7 research outputs found

    Data on the mixing of non-Newtonian fluids by a Rushton turbine in a cylindrical tank

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    The paper focuses on the data collected from the mixing of shear thinning non-Newtonian fluids in a cylindrical tank by a Rushton turbine. The data presented are obtained by using Computational Fluid Dynamics (CFD) simulation of fluid flow field in the entire tank volume. The CFD validation data for this study is reported in the research article ‘Numerical investigation of hydrodynamic behavior of shear thinning fluids in stirred tank’ (Khapre and Munshi, 2015) [1]. The tracer injection method is used for the prediction of mixing time and mixing efficiency of a Rushton turbine impeller. Keywords: Non-Newtonian fluids, Rushton turbine, Mixing time, Mixing efficiency, Cylindrical tan

    Study on residence time distribution of CSTR using CFD

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    114-120The mixing of fluid in a CSTR in presence/absence of impeller and baffles is investigated numerically using Computational fluid dynamics software package, Ansys Fluent. At the inlet of the CSTR, tracer (KCl) is injected by step change and the tracer concentration at the exit is noted with time to determine the age distribution function <i style="mso-bidi-font-style: normal">I(θ). The study helps to understand the residence time distribution (RTD) of CSTR. The CFD simulated predictions are compared with the literature data and a good agreement is found. The mixing performance of CSTR is studied using system parameters like tank Reynolds number and impeller rotation. The mixing characteristics such as Holdback, Segregation, mean residence time, variance and number of ideal CSTR in series equivalent to single actual CSTR are also determined and all these study ensures that the flow behaviour changes from dispersion to ideal mixing with increasing the tank Reynolds number and impeller speed. </span

    Study on residence time distribution of CSTR using CFD

    No full text
    The mixing of fluid in a CSTR in presence/absence of impeller and baffles is investigated numerically using Computational fluid dynamics software package, Ansys Fluent. At the inlet of the CSTR, tracer (KCl) is injected by step change and the tracer concentration at the exit is noted with time to determine the age distribution function I(θ). The study helps to understand the residence time distribution (RTD) of CSTR. The CFD simulated predictions are compared with the literature data and a good agreement is found. The mixing performance of CSTR is studied using system parameters like tank Reynolds number and impeller rotation. The mixing characteristics such as Holdback, Segregation, mean residence time, variance and number of ideal CSTR in series equivalent to single actual CSTR are also determined and all these study ensures that the flow behaviour changes from dispersion to ideal mixing with increasing the tank Reynolds number and impeller speed

    A numerical study of the wall effects for Newtonian fluid flow over a cone

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    The effect of blockage ratio i.e. ratio of diameter of cone, d and flow channel, D on the drag coefficients due to Newtonian fluid flow over cone is studied numerically by solving the CFD equations in Ansys FLUENT. The drag coefficients (CD) as a function of Reynolds number (Re) and d/D are reported in the range of Re: 0.01–30,000 and d/D: 0.0015–0.9. The obtained CD values are higher for confined flow (high d/D) than unconfined flow. Validity of CDRe2=constant is ascertained for the confined Newtonian fluid flow over the cone. The variations of angle of separation and its effect on the drag coefficients are examined and justified. The comparative studies among the drag coefficients of sphere, cylinder and cone are carried out in terms of wall effect, re-circulation length and slope of axial velocity profile. The observations revealed the order of CD as cylinder > cone > sphere. The hydrodynamic interactions between wall and fluid medium are presented with the help of velocity contour plots. More asymmetric flow is observed around the particle at higher Reynolds number and for higher wall effect. The simulated results presented herein for unconfined flow are in good agreement with the literature data
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