2 edition of Gas-liquid mixing studies on hydrofoil impellers found in the catalog.
Gas-liquid mixing studies on hydrofoil impellers
Caroline Maria McFarlane
Thesis (Ph.D)-University of Birmingham, School of Chemical Engineering.
|Statement||by Caroline Maria McFarlane.|
mixing with a single impeller of diameter D i equal to a 1/4 to 1/2 the tank diameter D T, the height of liquid in the tank H L should be no more than to D T. Because the intensity of mixing decreases quickly as fluid moves away from the impeller zone, large. IMPELLERS • Propellers (high-speed, low viscosity) • Turbines (Moderate viscosity) • High-efficiency impellers Three-blade marine propeller Straight-blade turbine Disk turbine Concave-blade CD-6 impeller Pitched-blade turbine • For specific time of mixing, the best mixer is the one.
Global and local gas–liquid characteristics (gas hold-up, volumetric mass transfer coefficient), and flow field, mixing time of the liquid phase are investigated for various triple-impeller configurations. Four types of impellers (Rushton turbine (RT), hollow blade turbine (HBT), wide-blade hydrofoil impeller pumping down (WHd), and pumping up (WHu)) were used to form four . The advanced hydrofoil impeller for high mixing efficiency The impeller multitalent with a high mixing efficiency. Thanks to different blade angles (standard versions 25° and 53°) and number of blades, this impeller can be universally used for versatile mixing tasks: Including suspension, blending, heat transfer and dispersion, of low- to.
Modelling of Micro-Mixing. Simulation with validation of mixing effects in continuous and fed-batch reactors (G.K. Patterson, J. Randick). A computational and experimental study of mixing and chemical reaction in a stirred tank reactor equipped with a down-pumping hydrofoil impeller using a micro-mixing-based CFD model (O. Akiti, P.M. Armenante). Hydrofoil Impeller. In 95% of industrial mixing applications, a left hand (LH) propeller is used. Its rotation will be clockwise when viewed from the motor end. This creates a downward flow to produce optimal tank turnover or mixing. If a Right hand propeller is required please email us.
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Gas—liquid mixing studies with multiple up‐ and down‐pumping hydrofoil impellers: Power characteristics and mixing time Danawati Hari‐Prajitno The School of Chemical Engineering, The University of Birmingham, Birmingham B15 2TT, UKCited by: modern concave and hydrofoil impeller designs for gas–liquid mixing.
Liquid mixing time. Gas–liquid mass transfer, including correlations for the mass transfer factor k L a and also the correct mean for the concentration driving force “hot” and boiling systems.
Gas voidageCited by: Torque fluctuations are less than those with single or dual down pumping axial hydrofoils. Mixing time studies using decolourisation for dual impeller configurations of APV-B2 under unaerated and aerated conditions showed that the mixing times for those configurations are much shorter than those for dual 6DT and may be even shorter than with Author: W.
Bujalski, D. Hari-Prajitno, K. Takenaka, K. Takenaka, J. McKemmie, A. Nienow. This second part of a four‐part series of papers reports on the hydrodynamic and power characteristics of two commercial, high solidity ratio, hydrofoil impellers, the Prochem Maxflo T and the Lightnin A, in an air—water system.
Studies were conducted primarily in a mixing vessel of diameter by: Liquid- and gas-phase macromixing behavior was studied in gas−liquid high-aspect-ratio reactors stirred with multiple hydrofoil impellers pumping downward. Hydrofoil impellers are typically associated with turbulent-flow mixing.
Simple calculations, computational fluid dynamics, mixing software, and laboratory testing reveal that they are also effective in laminar-flow applications.
▲Figure 1. Mixing: Impeller performance in stirred tanks Article (PDF Available) in Chemical Engineering -New York- Mcgraw Hill Incorporated then Chemical Week Publishing Llc- (8) August with.
Low Shear Mixing With a Novel Impeller Design Chris Hibshman¹, Binxin Wu¹ and Wojtek Wyczalkowski¹ ¹Philadelphia Mixing Solutions, Ltd., E. Main Street, Palmyra, PAUSA ABSTRACT Hydrofoil impellers are considered to be low shear devices.
Recent research indicates that hydrofoils may produce very. Mixing impellers fall into one of two categories: Radial Flow or Axial Flow. Radial flow impellers have multiple flat blades mounted parallel to the axis of the mixing shaft.
The blades can be attached to a disc forming a “closed” impeller or on a simple hub making an “open” style impeller. Typical uses are gas/liquid dispersion, liquid. The ﬂuid dynamic and mixing characteristics of a new hydrofoil impeller (termed Narcissus) for gas–liquid mixing are reported.
This impeller provides signiﬁcant energy-savings in bioreactor applications. Dye-tracer visualization and CFD simulation have been used to uncover the prevailing ﬂow patterns and the impeller liquid ﬂow map.
Hydrofoil impellers are based on Bernoulli's principle; which dictates that when the speed of a fluid in motion increases, the pressure of the fluid decreases. The majority of the energy is converted into motion rather than shear. Radial flow impellers are efficient in applications like gas/liquid mixing and dispersion.
Selecting An Impeller. Gas–Liquid Mass TransferA Comparison of Down- and Up–pumping Axial Flow Impellers with Radial Impellers. Chemical Engineering Research and Design82 (12), DOI: /cerd R SARDEING, J AUBIN, M POUX, C XUEREB.
Gas–Liquid Mass TransferInfluence of Sparger Location. Adapted from Z. Jaworski, A.W. Nienow, and K.N. Dyster,An LDA study of the turbulent flow field in a baffled vessel agitated by an axial, down-pumping hydrofoil impeller. Can. Impellers. If there were only one mixing job to do, only one impeller would be required.
However, there is a very wide range of problems in agitation, and the best impeller for one application may not be the best impeller for another.
The descriptions and discussions below are intended as a guide for impeller. Subsidiary of Fusion Fluid Equipment, LLC Silver Creek Road Whitehall, MI Toll Free: Office: Fax: Gas-liquid mixing studies with multiple upand down-pumping hydrofoil impellers: Power characteristics and mixing time.
Canadian Journal of Chemical Engineering, 76, – DOI: /cjce CAS Article Google Scholar. The 3 bladed SS high-efficiency hydrofoil impellers offer the greatest pumping per horsepower in the Mixer Direct impeller line.
They are used in a variety of. A study of three parts was conducted to characterize the effect of the spacing between impellers on the most important parameters that related to biological contactor performance: oxygen mass transfer coefficient from the gas phase (air) to the liquid phase (water), mixing time, and power consumption for different operating rotational speeds (– rps) and for three different spacing positions.
Most of the recent studies on the up-pumping concept have concentrated mainly on power characteristics and mixing times, and have shown that by applying up-pumping impellers to gas-liquid systems torque and flow instabilities are reduced, flooding is less likely to occur and there is no loss in power upon gassing The video shows a ProQuip HiFlow TM Impeller (axial flow hydrofoil impeller), center mounted in a lab scale baffled tank.
The liquid is water. For more information about mixing impeller flow patterns, email [email protected], call us at or view our blog on mixing impeller types.
Share this entry. Conclusion u The Chemineer BT-6 is the latest innovation in radial flow gas dispersion impeller technology. u Experimental data was gathered with high gas flow rates in tanks with diameters up to m: Ø The patented impeller disperses more gas than all other designs.
Ø The effect of gas flow rate on power draw is reduced compared to all preceding designs. Mixing Flow Patterns & Impellers Mixing Flow Patterns & Impeller Types. In our article on 4 Impeller Types and Their Applications, we provided an overview on the most common types of impellers used in industrial we’ll go into more detail about each impeller type and their influences on the mixing process.In recent years, the requirements for mixing systems in industrial applications have increased steadily.
The design of the impellers, the selection of a suitable mixing system, as well as the arrangement of the individual components on the agitator have a decisive influence on the process engineering and mechanical properties.