Effects of the Blade Shape on the Trailing Vortices in Liquid Flow Generated by Disc Turbines

Zhao, Jing; Gao, Zhengming; Bao, Yuyun

doi:10.1016/s1004-9541(11)60160-2

Cited by 36 publications

(21 citation statements)

References 24 publications

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“…7 the intensity of λ 2 linearly decreases in the log scale. Similar trends were also reported in Zhao et al [33]. In the case of DES simulation the strength of the trailing vortices close to the blade is remarkably higher.…”

Section: Identification Of the Trailing Vorticessupporting

confidence: 83%

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Study of fluid flow in baffled vessels stirred by a Rushton standard impeller

Chára

Kysela

Konfršt

et al. 2016

Applied Mathematics and Computation

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Section: Identification Of the Trailing Vorticessupporting

confidence: 83%

“…8). The experimental and simulated data are compared to the data of Yianneskis et al [32], Escudié et al [13] and Zhao et al [33]. The positions of the trailing vortices simulated by DES are more distant from the impeller than the measured ones.…”

Section: Identification Of the Trailing Vorticesmentioning

confidence: 96%

Study of fluid flow in baffled vessels stirred by a Rushton standard impeller

Chára

Kysela

Konfršt

et al. 2016

Applied Mathematics and Computation

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“…The LES results with the WALE model give the best estimation of radial velocity at 2z/w 5 1.0, as shown in Figures 5d-f and Table 1, while the predictions of radial velocity at 2z/w 5 0 and r/R > 1.2 deviate significantly from the SPIV data (see Figures 5a-c and Table 1). Good and bad agreement presented by this model can also be observed simultaneously in the predictions of axial and tangential velocities (see Figures 6,7 and Table 1). In Figure 8, the LES results with the WALE model agree well with the SPIV data except for some local deviations (see Figures 8c, d), and the WALE model gives the smallest averaged standard deviation of the TKE difference of the four SGS models, as listed in Table 1.…”

Section: Comparison Of Four Sgs Modelssupporting

confidence: 64%

“…However, compared with the numerous research on the characteristics of gas dispersion, [1][2][3][4] few studies have been conducted on the flow hydrodynamics of such stirred tanks. [5][6][7] Experimental investigation is the fundamental method to reveal the flow characteristics in stirred tanks. Up to now, a large number of studies on the flow fields in stirred tanks with radial flow impellers have been carried out by using nonintrusive techniques, such as laser Doppler velocimetry (LDV) and particle image velocimetry (PIV).…”

Section: Introductionmentioning

confidence: 99%

Stereo‐PIV experiments and large eddy simulations of flow fields in stirred tanks with Rushton and curved‐Blade turbines

Song

Bao

et al. 2013

AIChE Journal

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The flow characteristics in pilot-scale stirred tanks with Rushton and curved-blade turbines were investigated by using stereoscopic particle image velocimetry (SPIV) experiments and large eddy simulation (LES) methods. The velocity and turbulent kinetic energy (TKE) in the impeller discharge regions were carefully resolved with a high resolution SPIV system, and the detailed phase-resolved velocity and TKE profiles were used to validate the LES results. The effects of Reynolds number and blade shape on the flow characteristics were discussed. The LES results of velocity, TKE, and the evolution of trailing vortices were compared with the SPIV experimental data, and good agreement was obtained at various phase angles. The effects of subgrid scale model and hybrid grid with different mesh resolutions on the LES results were investigated. LES is a computationally affordable method for the accurate predictions of the complex flow fields in pilot-scale stirred tanks is presented.

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“…The flow generated by the impeller is influenced by various factors including the shapes and number of impeller (Muharam & Kurniawan, 2016), the impeller size, the impeller type (Zhao et al, 2011;Sossa-Echeverria & Taghipour, 2015), the location and layout of the impeller (Rahimi, 2005) and rotational speed.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of the Time-dependent Flow Field of a Water-Molasses Mixture Inside a Stirred Vessel

Madhania

Nurtono

Winardi

et al. 2019

IJTech

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Detailed information on the flow field in the operation of a mixing unit is necessary for the optimal design of the reactor. The flow field characteristic is an essential factor in obtaining an optimal stirred vessel design. The efficiency of the stirred vessel system depends on, for example, the stirred vessel geometry, the flow induced by the impeller, the working fluid properties and the operating condition. The aim of this study is to exhibit the time-dependent flow field of the mixing process inside a stirred vessel for different propeller rotational speeds using computational fluid dynamics methods. The working fluid in question is molasses and water, which is a miscible liquid. The stirred vessel is a conical-bottomed cylindrical vessel (D = 0.28 m and H = 0.395 m) equipped with a three-blade propeller (d = 0.036 m). The transient calculation was conducted using ANSYS Fluent version 18.2. The Mixture multiphase flow model coupled with the Reynolds-averaged Navier-Stokes Standard − (SKE) turbulence model was applied to capture the information on the time-dependent flow fields at various propeller rotational speeds inside the stirred vessel. The flow generated by the propeller was compared at 1000 rpm, 1300 rpm and 1500 rpm. The Multiple Reference Frame method was used to solve the moving domain and stationary domain multiple frames case. The results revealed the local velocity, flow pattern, molasses volume fraction value, density gradient distribution, power number and flow number. The profile of all the variables determines the optimal operating conditions for the degree of mixing required.

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Effects of the Blade Shape on the Trailing Vortices in Liquid Flow Generated by Disc Turbines

Cited by 36 publications

References 24 publications

Study of fluid flow in baffled vessels stirred by a Rushton standard impeller

Study of fluid flow in baffled vessels stirred by a Rushton standard impeller

Stereo‐PIV experiments and large eddy simulations of flow fields in stirred tanks with Rushton and curved‐Blade turbines

Computational Study of the Time-dependent Flow Field of a Water-Molasses Mixture Inside a Stirred Vessel

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