Comparison of Mixing Performances among Several Spatial Chaotic Mixing Methods

Takahashi, Koji; Takeno, Yohei; Takahata, Yasuyuki

doi:10.1252/jcej.14we208

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…In another development, [31] posited that "while the chaotic degree could be efficiently increased by the temporal terms such as co-reverse periodic rotational impeller speed and timeperiodic fluctuation of rotational impeller, speed, the approach is never the less limited in practical applications because of the restriction of the motor and the speed reducer machine". Hence, [31] measured "the mixing times and power consumptions for several different spatial chaotic mixing methods, such as an off-centre impeller, inclined impeller and inserting an object in identical agitated vessels agitated by the same impeller, and the comparison of mixing performances among these methods". Consequent on the foregoing, [31] found that "the inserting of an object is the best method among the spatial chaotic mixing methods to achieve a short mixing time at low power consumption".…”

Section: Type I -Mixer With Onementioning

confidence: 99%

“…Hence, [31] measured "the mixing times and power consumptions for several different spatial chaotic mixing methods, such as an off-centre impeller, inclined impeller and inserting an object in identical agitated vessels agitated by the same impeller, and the comparison of mixing performances among these methods". Consequent on the foregoing, [31] found that "the inserting of an object is the best method among the spatial chaotic mixing methods to achieve a short mixing time at low power consumption". Also [32] studied "the effect of impeller modification in addition to eccentricity.…”

Section: Type I -Mixer With Onementioning

confidence: 99%

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Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

Okpighe

Shadrack

Nwosu

2022

CJAST

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An in dept review of the Development of Operating Model for the Design of Stirrer Arms of Slurries is reported. The works of several authors were reviewed. These works covered research on the importance of slurries, application of different slurries in the area of Agriculture and agricultural farming, construction and allied industries, foods and pharmaceutical industries, chemical and paints industries. Also considered were the research works on the design, fabrication and test investigation of performance of different stirrer arms. From the review, three key outcomes from three set of researchers were identified thus: Researcher team 1: the TTP propeller was the most efficient in liquid phase mixing; Researcher team 2: the TEET geometry contributed the best quality of the mixing and significantly reduced the cost of the mixing process; Researcher team 3: the two Z blade stirrer arm was considered as the best in terms of mixing effectiveness. These three outcomes appear as standalone and do not give the user(s) information on comparative advantages for deployment of stirrer arms. Consequent on the above, further theoretical and empirical research will need to be done to evaluate the Order of Merit of these stirrer arms to be called to bar.

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Section: Type I -Mixer With Onementioning

confidence: 99%

Section: Type I -Mixer With Onementioning

confidence: 99%

Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

Okpighe

Shadrack

Nwosu

2022

CJAST

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“…Under spatial chaotic mixing method was investigated. The impeller with inserted object gave the shortest mixing time at low power consumption [5]. Also the mixing hydrodynamics in a double planetary mixer was investigated using numerical and experimental approach over crosslinking reaction.…”

Section: Literaturementioning

confidence: 99%

Development of Operating Model for the Design of Stirrer Arms of Slurries: Empirical Evaluation of Stirrer Arms

Okpighe

Shadrack

Nwosu

2022

CJAST

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The “Development of Operating Model for the Design of Stirrer Arms of Slurries: Empirical Evaluation of Stirrer Arms” is reported. Previous work reviewed the “Operating Model for the Design of Stirrer Arms of Slurries” and identified the Two Z and TETE stirrer arms as the most effective. Furthermore, subsequent work “Development of Operating Model for the Design of Stirrer Arms of Slurries: Design and Fabrication of Stirrer Arms” designed and fabricated the Two Z and TETE stirrer arms, evaluated the theoretical (expected) Slurry Mixing Power and Order of Merit Analysis. The current work did the empirical evaluation of the Two Z and TETE stirrer arms and also the hybrid Two Z - TETE stirrer arms. The Objectives of this research were: to do the mixing performance tests in terms of mixing time, power and energy consumed by the Two Z blade, TETE blade and Two Z – TETE hybrid blade using the constituted slurry; to validate the theoretical (predicted or expected) mixing power for the Two Z blade, TETE blade and Two Z – TETE hybrid blade by comparison with the empirical power using the Chi Square; to do the Power, Time and Energy order of merit analysis for the Two Z blade, TETE blade and the Two Z – TETE hybrid blade. Using the Philips HR 1565 mixer with the Akamu (pap) (Viscosity calibrated) slurries, the time and current drawn for complete and consistent slurry mixing by each type of stirrer arm (namely: Two Z, TETE and Two Z – TETE) was recorded. Results obtained were analyzed using the Chi Square and the Order of Merit. There was excellent agreement between the adjusted predicted (expected) slurry mixing power (E’) and Observed slurry mixing power (O) at 5% confidence level. Empirical model was developed to predict expected slurry mixing power. The Order of Merit analysis revealed the TETE stirrer arm as the most energy efficient.

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“…3 Yao et al 4 indicated that increasing the amplitude of fluctuation of stirring speeds and enhancing the frequency of periodic co-reverse rotation can make better mixing. Takahashi et al 5,6 experimentally found that inserting an object into a vessel to destroy the IMRs can achieve a short mixing time compared to an offcenter impeller and inclined impeller methods. Yu and Gunasekaran 7 indicated that a larger blade induces a better mixing effectiveness due to the increment of strain rate in the mixing system.…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of the effects of blade’s geometric parameters on the power consumption of the twin-blade planetary mixer

Jiang

Zhan

Yang

et al. 2016

Advances in Mechanical Engineering

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Blades act as key components for twin-blade planetary mixer; their geometric parameters (blade-blade clearance and helical angle) and two different rotating modes (counter-rotating mode and co-rotating mode) were investigated numerically via commercial software ANSYS Fluent 14.5 to reveal the effects on the power or torque consumption. The results indicate that decreasing the blade-blade clearance or increasing the helical angle increases the power consumption of the twin-blade planetary mixer. The proportionality constant of power curves depends on the geometry of the blades.

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Comparison of Mixing Performances among Several Spatial Chaotic Mixing Methods

Cited by 5 publications

References 12 publications

Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

Development of Operating Model for the Design of Stirrer Arms of Slurries: A Review

Development of Operating Model for the Design of Stirrer Arms of Slurries: Empirical Evaluation of Stirrer Arms

A numerical investigation of the effects of blade’s geometric parameters on the power consumption of the twin-blade planetary mixer

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