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Kato Y.,Nagoya Institute of Technology | Hiramatsu M.,Nagoya Institute of Technology | Ohtani S.,Nagoya Institute of Technology | Yoshida M.,Nagoya Institute of Technology | Shiobara K.,Satake Chemical Equipment Manufacturing Ltd
Kagaku Kogaku Ronbunshu | Year: 2015

The streak line visualization method developed by Inoue et al. (2009) is effective for evaluation of mixing performance in the laminar flow region. In the previous work, the mixing mechanism of large paddle impellers that can be used over a wide range of viscosity was clarified based on this method. In the present work, the geometry of a new impeller that has good mixing performance was optimized based on streak line observation. The new impeller has (1) simple geometry, (2) speedy mixing performance, and (3) stable operating characteristics. © 2015 The Society of Chemical Engineers, Japan.


Wong S.D.,University of Malaya | Ibrahim S.,University of Malaya | Zamzam Z.,SATAKE Chemical Equipment Manufacturing LTD | Kato Y.,SATAKE Chemical Equipment Manufacturing LTD | Sato M.O.,SATAKE Chemical Equipment Manufacturing LTD
Journal of Chemical Engineering of Japan | Year: 2015

Particle distribution and just-suspension speeds have been studied for SATAKE SUPERMIX® HR100 and HS604 impellers in comparison to a 45° pitched-blade turbine (4PBT) and propeller (3P) in a flat-base fully baffled cylindrical tank. The slurries were made up of 18.0 μm, 75.3 μm and 195.5 μm diameter PMMA particles in water, with solids loading ranging from 5 to 40% by weight. Points of last suspension were either from the center, side, or annular region, and are directly related to the flow on the tank base, which could result from primary discharge or induced flow. Increasing impeller clearance from the base reduces the extent of flow for the 4PBT and 3P, such that at high clearances the main flow completely separates into two recirculating loops, with weaker secondary loops in the lower half of the tank. This led to the accumulation of particles at the tank center. By comparison, the HR100 generates a strong axial flow that was maintained at all clearances, thereby making it more advantageous in clearing particles at the tank center. Njs increased with increasing C/D, particularly at high clearances for the 4PBT and 3P, while the HR100 is relatively less affected by clearance. At C/D=0.75 and 1.0, Njs for both the 4PBT and 3P are strongly affected by solids loading of 20 wt% and upwards. The HS604 has promising suspension performance in terms of stability with respect to changes in solids loading, and this is related to its discharge pattern that results from a very low clearance. © 2015 The Society of Chemical Engineers, Japan.


Kanamori H.,Satake Chemical Equipment Manufacturing LTD | Yamamoto T.,Satake Chemical Equipment Manufacturing LTD | Kato Y.,Satake Chemical Equipment Manufacturing LTD | Zamzam Z.,Satake Chemical Equipment Manufacturing LTD
Journal of Chemical Engineering of Japan | Year: 2011

With the object of developing a new measuring method of the heat transfer coefficient at the inside wall of an agitated vessel in high Reynolds number region, extensive investigation has been conducted using a model tank that holds two types of thermocouples attached on the surface wall of a test piece. This new method is verified experimentally by the confirmation on the linearity of temperature slope in the test piece, suitability of setting method of the thermocouples on the surface of the test piece and the correspondence between this new method and the extrapolation method. Then, this new method is practically applied to determine the heat transfer coefficient at the inside wall of an agitated vessel. The impellers used are a 3-bladed propeller, a 4-bladed pitched paddle, a 6-bladed flat turbine and Satake Supermix MR210 as a large scale impeller. The characteristics of each impeller are clarified by investigating the effects of the impeller speed, baffling conditions, and the clearance between the impeller and the vessel bottom on the heat transfer coefficient. Moreover, new information concerning the relations between the flow pattern and the flow velocity distribution on the heat transfer coefficient are also clarified. Finally, this new method is confirmed to provide beneficial information for new designs of mixing devices. © 2011 The Society of Chemical Engineers, Japan.


Ogawa K.,Tokyo Institute of Technology | Ogawa K.,Satake Chemical Equipment Manufacturing Ltd
Journal of Chemical Engineering of Japan | Year: 2012

By making use of information entropy, a new evaluation index of the mixing state of a local region in a mixing vessel in the case of multi-component mixing is presented. The newly defined index is more general than the old multi-component mixedness and has clear theoretical relationships with other mixing evaluation indices and separation evaluation indices which has been presented. Further, the usefulness of the newly defined index is clarified by application to an imaginary mixing situation which satisfies suitable conditions. © 2012 The Society of Chemical Engineers, Japan.


Ibrahim S.,University of Malaya | Wong S.D.,University of Malaya | Baker I.F.,University of Malaya | Zamzam Z.,SATAKE Chemical Equipment Manufacturing LTD. | And 2 more authors.
Chemical Engineering Research and Design | Year: 2015

Particle size, solids loading and impeller clearance from the base were all found to have significant effects on the just-suspension of fine particles in a stirred tank. At the higher end of particles size studied, where there is greater difference in settling velocities between particle sizes, the smaller the particles the less specific energy, ejs is required for just-suspension. But at the low end of particle size range, changes in the settling velocity are small while continued reduction in particle size corresponds to substantial increase in total particle surface area, leading to increased ejs possibly due to particles interactions. Just-suspension of PMMA particles of diameter 195.5μm required higher ejs than for 75.3μm particles, whereas ejs for 75.3μm particles was lower than that for 18.0μm diameter particles. Experiments were conducted in water in a 15.5cm cylindrical tank at an aspect ratio of 1:1 over a range of loadings from 5 to 40% by weight. The HR100 and HS604 SUPERMIX® impellers manufactured by SATAKE, generally showed better efficiencies compared to the conventional 4 pitched-blade turbine and 3-blade propeller, in addition to being less affected by changes in operational parameters. The HS604 performance proved that a radial impeller can be comparable to or better than a downward axial impeller in solid-liquid suspension if used at very low clearance. S factor values under different experimental conditions are presented. © 2014 The Institution of Chemical Engineers.


Zamzam Z.,Tokyo Institute of Technology | Zamzam Z.,SATAKE Chemical Equipment Manufacturing LTD | Yoshikawa S.,Tokyo Institute of Technology | Ookawara S.,Tokyo Institute of Technology | Kato Y.,SATAKE Chemical Equipment Manufacturing LTD
Journal of Chemical Engineering of Japan | Year: 2016

A new model for estimation of just-suspension speed in a stirred tank is proposed based on the forces acting on a single stationary particle on a flat plate in the presence of a simple shear flow. We suggested that if the lift force acting on the particle is greater than the difference between gravitational force and buoyancy force, particle lifts off. However, if the lift force is smaller than the difference of these two forces, particle settles. In order to estimate the lift force component acting on the particle, a simple 3-dimensional of CFD model is generated. By simulated lift force component, the representative flow velocity subjected to the radius of the solid particle for just-suspension is determined. For estimation of the representative flow velocity, flow velocity distributions inside stirred tank is employed at the inlet of the CFD model as a customized boundary condition. The boundary condition is determined based on direct measurement of flow velocity close to the tank base using L.D.V. It is showed also that flow visualization close to the tank bottom using P.T.V. agrees well with the L.D.V. results. The representative flow velocity obtained from the CFD model is verified and compared with the experimental value at just-suspension speed for a wide range of particle densities, 0.03≤/ρlρ1≤▵1.5. The results showed that the calculated value agrees reasonably well with the experimental value within the error of ±15% at a given system using a 4 bladed pitched paddle impeller. The determination of the effect of lift force acting on a solid particle for solid-liquid suspension in a stirred tank may overcome the limitation of the conventional experimental method by visual observation for characterizing the just-suspension speed. Moreover, the new proposed model also offers physical understanding in regards to explaining the mechanism of just-suspension which has not been reported by earlier workers. © 2016 The Society of Chemical Engineers, Japan.


Patent
Hado Co. and SATAKE CHEMICAL EQUIPMENT Manufacturing LTD. | Date: 2012-07-17

To provide a crystallization device with a simple structure and high classification performance in crystallization at a center part of an upper part in a vertical container having a classification leg on a bottom portion, rotor blade unit for generating a swirling flow of a raw material liquid of a suspension slurry in the container along an inner circumferential surface of the container is provided, and at a center part on a bottom surface of the container, liquid-flow direction changing unit for causing the raw material liquid to flow upward at the center part of the container is provided, and the liquid-flow direction changing unit is formed of baffles, each being made of a band-shaped plate, provided radially on the bottom surface.


Patent
Satake Chemical Equipment Manufacturing Ltd. and Hado Co. | Date: 2015-05-27

[Object] To provide a crystallization device with a simple structure and high classification performance in crystallization. [Solution] At a center part of an upper part in a vertical container 2 having a classification leg 3 on a bottom portion 2b, rotor blade means 5 for generating a swirling flow of a raw material liquid of a suspension slurry in the container 2 along an inner circumferential surface of the container 2 is provided, and at a center part on a bottom surface of the container, liquid-flow direction changing means 6 for causing the raw material liquid to flow upward at the center part of the container 2 is provided, and the liquid-flow direction changing means 6 is formed of baffles 6a, each being made of a band-shaped plate, provided radially on the bottom surface.


Patent
SATAKE CHEMICAL EQUIPMENT Manufacturing LTD. | Date: 2010-02-12

An up/down movable diaphragm is disposed to an upper surface portion of a stirring vessel so as to airtightly cover the upper surface portion, a drive shaft passing through the diaphragm is fixed and vertically disposed to the diaphragm, and a stirring blade coupled with and fixed to a lower end portion of the drive shaft so as to be orthogonal thereto is composed of a laterally long and oval sheet-shaped member having a major axis and a minor axis passing through a center thereof, and a stirring is performed by moving the stirring blade up and down. With this arrangement, there are provided a stirring blade and a stirring apparatus which do not apply a strong shearing force to a stirring liquid, do not have an anxiety of polluting the stirring liquid, and can sufficiently fluidize, mix, disperse, and homogenize the stirring liquid in a stirring blade and a stirring apparatus for performing a stirring in fields of medicine and food.


Furukawa H.,Nagoya Institute of Technology | Kato Y.,Nagoya Institute of Technology | Nagumo R.,Nagoya Institute of Technology | Tada Y.,Nagoya Institute of Technology | Sato M.,Satake Chemical Equipment Manufacturing Ltd
Kagaku Kogaku Ronbunshu | Year: 2014

To improve mixing performance, a cone-type draft tube based on the wind lens used in a wind power plant was proposed. Observation and measurement of the mixing pattern and power consumption with the cone-type draft tube revealed that it provided better mixing with lower power consumption. © 2014 The Society of Chemical Engineers, Japan.

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