Study of various curved-blade impeller geometries on power consumption in stirred vessel using response surface methodology

Ghotli, Reza Afshar; Aziz, Abdul; Ibrahim, Shaliza; Baroutian, Saeid; Arami-Niya, Arash

doi:10.1016/j.jtice.2012.10.010

Cited by 35 publications

(12 citation statements)

References 37 publications

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“…The response surface function is used in the next step to fit the actual analysis data characterized by the DOE and sample a surrogate model. The response surface optimisation is used to perform an indirect optimisation analysis and evaluate the optimum candidate design predicted by various methods [47]. It provides a smooth and continuous mathematical formulation by interpolating between discrete design points of the DOE.…”

Section: Numerical Optimisation Of the Outward Flow Radial Turbinementioning

confidence: 99%

“…It solves different response surfaces in parallel, analyses them regarding their accuracy and the stability in the cross-validation and can be a single response surface or a combination of several different response surfaces [46]. In the optimisation step, the genetic algorithm was used as the optimiser which is a well-known approach in turbomachinery design optimisation) [44,45,47]. In the genetic algorithm, feasible solutions are specified according to the bounds of the optimisation problem and the optimal solution is explored by analysing the maximum allowable Pareto front [48].…”

Section: Numerical Optimisation Of the Outward Flow Radial Turbinementioning

confidence: 99%

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Design Optimisation of a Unidirectional Centrifugal Radial-Air-Turbine for Application in OWC Wave Energy Converters

et al. 2019

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Research on employing unidirectional air turbines for oscillating water columns (OWC) has received much attention in the last few years. Most unidirectional turbine topologies considered to date use axial flow unidirectional turbines. The radial turbine offers an alternative with increased resistance to backflow. However, in general, the efficiency of radial turbines is lower than axial turbines. This study describes a computational fluid dynamics (CFD)-based design optimisation of an outflow radial turbine for the intended application in an OWC system configured to enable primarily unidirectional flow through the turbine. The rotor blade geometry is parametrically described in addition to other turbine components. The central composite design (CCD) and genetic algorithm were used to explore an optimum design of a centrifugal radial turbine for a maximum total-to-static efficiency. Seven computer aided design (CAD) parameters were investigated as the design variables, and the optimum turbine design was identified in a population of 79 design points. The optimum outflow turbine was found to have a peak steady-state efficiency of 72%, and the leading-edge angle, guide vane angle, trailing edge angle, and the chord length were found to have the highest sensitivity. Compared to an inflow radial turbine, the geometrical features of the outflow turbine permit higher absolute velocities of the flow at the rotor entrance and increase the dynamic pressure changes across the rotor. Therefore, the optimised outflow radial turbine can obtain acceptable rotor energy transfer despite having a negative centrifugal energy transfer term.

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Section: Numerical Optimisation Of the Outward Flow Radial Turbinementioning

confidence: 99%

Section: Numerical Optimisation Of the Outward Flow Radial Turbinementioning

confidence: 99%

Design Optimisation of a Unidirectional Centrifugal Radial-Air-Turbine for Application in OWC Wave Energy Converters

et al. 2019

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“…In mixing with the TBT and ABT impeller, no surface aeration in the same range of impeller speeds was detected. Therefore, why the ABT power curve stabilizes at a higher Re number can be attributed to its hollow blade shape; these types of impellers develop fully turbulent regime in the baffled tank at higher impeller speeds [23]. …”

Section: Mixing Power In Watermentioning

confidence: 99%

“…If an additional enlarged amount of air needs to be dispersed in some fermentation processes [8], at a minimum, the lowest impeller must be replaced with a more capable one in terms of preserving the pumping capacity and the small power reduction as much as possible by gassing. There are many studies in which Rushton turbine modifications [21] and [22] and disk impellers of various blade shapes [19] and [23] to [26] were used to enhance the lowest impeller characteristics.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Blade Disc Turbine for High Aeration Rate in a Fermenter

2018

SV-JME

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Highlights: High efficiency of the newly developed and patented asymmetrically folded blade turbine (ABT) during dispersing of air into water by single impeller stirring.  Low power number of the ABT impeller in water mixing (1.75).  High pumping capacity by air dispersing at very small power draw reduction (less than 16 %).  Capable of dispersing much greater amounts of air (up to 53 %) than the Rushton turbine is.  The shortest mixing time by the same impeller energy dissipation.  Some CFD analysis results included for better insight into inhomogeneity in the liquid. INTRODUCTIONAir dispersion in tall, slim fermenters is mostly carried out with multistage impellers to provide high air flow intake, which must be supplied in some fermentation processes in the pharmaceutical industry. Such an impeller can be assembled of two equal impellers, such as dual Rushton turbines in parallel, merging, and diverging flow conditions [1], power consumption [2], mixing rate [3] or flow patterns [4]. The higher the ratio between tank height and its diameter H/T, the higher the number of impellers equidistantly placed to ensure as much uniform void fraction distribution as possible [5] to [8]. Nowadays, a combination of axial and radial impellers [7] and [9] predominates. The choice of a proper impeller for the given geometric configuration of the mixing vessel is of prime importance for the optimal achievement in the fermentation process: a fermenter must have a flow field that provides the organisms with air throughout the entire volume of the liquid. Any dead zone can cause an improperly fermented product due to lack of air. A multi-stage impeller with a proper configuration provides the circulation of substances in the fermenter and most evenly distributes the air throughout the liquid volume [10]. To determine these conditions, it is necessary to know the main characteristics of the individual impeller, such as the mixing power [11] and [12] Each impeller dispersing air is limited by the maximum amount of air to be dispersed. Further increasing of the air flow rate causes flooding.

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“…Besides this Rushton turbine turns out to be a poor gas handler at high aeration rates, they experience significant power drop upon gassing which influences the mass transfer. Disk turbines with curved blades are extensively studied [1,8,9].They are found to be better gas handlers and experience lesser loss in power upon aeration. This blade shape also contributes to lesser cavity formation behind the blades and hence improves the mass transfer capabilities.…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer Studies in an Agitated Vessel With Radial-Axial Impeller Combination

Karanth¹

2015

IJRET

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Study of various curved-blade impeller geometries on power consumption in stirred vessel using response surface methodology

Cited by 35 publications

References 37 publications

Design Optimisation of a Unidirectional Centrifugal Radial-Air-Turbine for Application in OWC Wave Energy Converters

Design Optimisation of a Unidirectional Centrifugal Radial-Air-Turbine for Application in OWC Wave Energy Converters

Asymmetric Blade Disc Turbine for High Aeration Rate in a Fermenter

Mass Transfer Studies in an Agitated Vessel With Radial-Axial Impeller Combination

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