Study on Tangential Velocity Distribution for Radial Direction in a Fully Turbulent Agitated Vessel without Baffles

Shiobara, Katsumi; Hiraoka, Setsuro; Kato, Yoshihito; Iwata, Shuichi; Yamaguchi, Takao; Yamamura, Masaaki

doi:10.1252/kakoronbunshu.33.281

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…The sequential 1000 frames were analyzed statistically to evaluate the liquid motion, and the sampling interval was 0.005 seconds because the reproducible flow pattern was obtained from the same test conditions. [ 36 ] The experimental conditions for the PIV measurement are also shown in Table 3. The variables were blade angle and rotation speed.…”

Section: Methodsmentioning

confidence: 99%

“…The acrylic hemispherical vessel with an inner diameter of T (m) without baffles was surrounded by an acrylic cuboid vessel filled with tap water to decrease the optical refraction index. [33][34][35][36] Liquid was charged into the hemispherical vessel in order to become bath depth, H L (m) = (3/5)T. The off-bottom clearance, C (m), was defined as the distance between the impeller and vessel bottom. The shaft centre of the impeller was set on the central axis of the hemispherical vessel and the up-pumping impeller was used in this study.…”

Section: Visual Observationmentioning

confidence: 99%

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Suspension pattern and rising height of sedimentary particles with low concentration in a mechanically stirred vessel

et al. 2020

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In this study, the effects of impeller rotation speed, off-bottom clearance, blade angle, types of solid and liquid, etc., on the suspension pattern of sedimentary particles and particle rise height in liquid were investigated with a hemispherical vessel without baffles under low particle concentration. The transition conditions of suspension pattern between regimes I and II, and regimes II and III, were observed visually, and their non-dimensional equations were expressed with an acceptable correlation by varying the above operation factors a great deal. Here, regime I is stagnation of particles on a vessel bottom, II is partial suspension, and III is complete suspension in liquid. The non-dimensional equation of the maximum particle rise height was also successfully obtained. The combination of the non-dimensional equations of transition and maximum particle rise height permitted us to determine the adequate solid/liquid mixing operation conditions without collision of particles with device parts.

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Section: Methodsmentioning

confidence: 99%

Section: Visual Observationmentioning

confidence: 99%

Suspension pattern and rising height of sedimentary particles with low concentration in a mechanically stirred vessel

et al. 2020

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“…When m = 1.9 was used instead of 1.7, the profile of u ++ came into good agreement, as shown in Figure 5. Shiobara et al 45 showed that the parameter m can be expressed using the radius of a cylindrically rotating zone as = m r r 2.5( / ) c d 2 (10) They used the correlation equation of power consumption by Kamei et al 46 to calculate r c for paddle impellers having different configurations in their paper. This overestimation may come from the definition of m. As Tamburini et al 47 pointed out, at very large Re d , eddy−viscosity models including the SST k−ω model slightly overestimate the power consumption of the impeller due to the turbulence anisotropy.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…When m = 1.9 was used instead of 1.7, the profile of u ++ came into good agreement, as shown in Figure . Shiobara et al showed that the parameter m can be expressed using the radius of a cylindrically rotating zone as They used the correlation equation of power consumption by Kamei et al to calculate r c for paddle impellers having different configurations in their paper. This overestimation may come from the definition of m .…”

Section: Resultsmentioning

confidence: 99%

Friction Factor Distribution at the Side Wall of a Turbulent Agitated Vessel with Baffles Using a MAXBLEND Impeller

Ochi

Takenaka

Komoda

et al. 2022

Ind. Eng. Chem. Res.

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In analogy to momentum, heat, and mass transfer, the friction factor at the sidewall plays a crucial role in transport phenomena in chemical processes using agitated vessels. The present work numerically investigated the distribution of the friction factor in a turbulent agitated vessel with the aid of a computational fluid dynamics simulation. The numerically obtained velocity distribution for a paddle impeller showed a good agreement with experimental and theoretical values, which indicated that the numerical procedure was reliable. A circulation flow induced by a MAXBLEND impeller was deformed by adding baffle clearance, and a more complex flow pattern was observed. The friction factor in the baffled vessel using the MAXBLEND impeller had large-scale fluctuations upon installing baffle clearance, which may show the enhancement of heat/mass transfer at the sidewall of the vessel. H(3)

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Estimation of Boundary Layer Thickness at Side Wall of a Fully Turbulent Agitated Vessel without Baffles

Shiobara¹,

Hiraoka

Kato

et al. 2007

J. Chem. Eng. Japan

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Study on Tangential Velocity Distribution for Radial Direction in a Fully Turbulent Agitated Vessel without Baffles

Cited by 5 publications

References 10 publications

Suspension pattern and rising height of sedimentary particles with low concentration in a mechanically stirred vessel

Suspension pattern and rising height of sedimentary particles with low concentration in a mechanically stirred vessel

Friction Factor Distribution at the Side Wall of a Turbulent Agitated Vessel with Baffles Using a MAXBLEND Impeller

Estimation of Boundary Layer Thickness at Side Wall of a Fully Turbulent Agitated Vessel without Baffles

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