Homogenization efficiency of helical ribbon agitators

Rieger, F.; Novák, V.; Havelková, Dagmar

doi:10.1016/0300-9467(86)80013-2

Cited by 30 publications

(16 citation statements)

References 6 publications

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“…Eq. (20) enables a decision to be made on which agitator exhibits the lowest specific power consumption in mixing a given fluid in a vessel of a given volume and required mixing intensity [10,46,52]. For present purposes, it allows one to determine which pumping mode of the helical ribbon impeller has the higher homogenization efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…To understand these results better, two measures available in literature to evaluate agitator efficiency are presented below, the mixing time number and the homogenization efficiency. The mixing time number, K m , is a constant for a specific geometry of close clearance impellers such as helical ribbons in the laminar flow regime [4,10,46,51]:…”

Section: Resultsmentioning

confidence: 99%

“…Shervin et al [5], Niedzielska and Kuncewicz [7], Guerin et al [8], Takahashi et al [9], and Reiger et al [10] have attempted to compare different helical ribbon agitator geometries to decide on the design of helical ribbon most suitable for the mixing operation under consideration. In most of these cases, the basis of comparison has included power consumption, mixing times, and circulation times.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Using CFD and Ultrasonic velocimetry to Study the Mixing of Pseudoplastic Fluids with a Helical Ribbon Impeller

Ihejirika

Ein‐Mozaffari

2007

Chem Eng & Technol

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A commercial CFD package was used to simulate the 3D flow field generated in a cylindrical tank by a helical ribbon impeller. The study was carried out using a pseudoplastic fluid with yield stress in the laminar mixing region. Ultrasonic Doppler velocimetry (UDV), a noninvasive fluid flow measurement technique for opaque systems, was used to measure xanthan gum velocity. From flow field calculations and tracer homogenization simulations, power consumption and mixing time results were obtained. The torque and power characteristics remain the same for upward and downward pumping of the impeller, but the mixing times are considerably longer for the downward pumping mode. Overall, the numerical results showed good agreement with experimental results and correlations developed by other researchers. From the power and mixing time results, two efficiency criteria were utilized to determine the best pumping mode of the impeller.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Using CFD and Ultrasonic velocimetry to Study the Mixing of Pseudoplastic Fluids with a Helical Ribbon Impeller

Ihejirika

Ein‐Mozaffari

2007

Chem Eng & Technol

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“…Therefore, for mixing of a highly viscous liquid, either ribbon or screw impellers are usually applied. These impellers guarantee relatively high heat transfer coefficients from the vessel wall to the mixing liquid (Carreau et al, 1976;Ishibashi et al, 1979;Kuriyama et al, 1981Kuriyama et al, ,1983Nagata, 1975) and short mixing times (Rieger et al, 1986). However, due to a large diameter (ribbon impellers) and small clearance between the impeller edge and the tank wall, these impellers require high power; hence, it is very important to know exactly the power demand in this case (Takahashi et al, 1982a).…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and power consumption for ribbon impellers. Mixing efficiency

Niedzielska

Kuncewicz

2005

Chemical Engineering Science

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“…Table 1 gives also geometry of the ribbon impellervessel system and measuring method which was used to determine the time of homogenization. Table 1 refer only to ribbon impellers because according to many authors (Bakker and Gates, 1995;Coyle et al, 1970;Rieger et al, 1986;Shiue and Wong, 1984) this type of impeller is most suitable for mixing liquids with high viscosity.…”

Section: Introductionmentioning

confidence: 99%

Optimization of geometric parameters of a ribbon impeller

Kuncewicz¹,

Stelmach²

2017

Chemical and Process Engineering

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Geometric parameters of a ribbon impeller were optimized on the basis of numerical calculations obtained from the solution of our own 3D/2D hybrid model. The optimization was made taking into account mixing power and homogenization time for ribbon impellers with a different number of ribbons and width operating in a laminar motion for Newtonian fluid. Due to minimum mixing energy required to stir a unit volume of liquid the most efficient impeller appeared to be that with one ribbon of width equal to 0.1 to 0.15 of the mixing vessel diameter. Impellers with more than one ribbon needed much higher mixing power but did not increase significantly secondary circulation in the vessel. These impellers increased first of all primary circulation, i.e. they increased only circular motion of liquid in the vessel.

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Homogenization efficiency of helical ribbon agitators

Cited by 30 publications

References 6 publications

Using CFD and Ultrasonic velocimetry to Study the Mixing of Pseudoplastic Fluids with a Helical Ribbon Impeller

Using CFD and Ultrasonic velocimetry to Study the Mixing of Pseudoplastic Fluids with a Helical Ribbon Impeller

Heat transfer and power consumption for ribbon impellers. Mixing efficiency

Optimization of geometric parameters of a ribbon impeller

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