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Inquiry OnlineMixing Impeller Power ProQuip Mixers . May 13, 2019 The value of the dimensionless power number Np depends on several factors including impeller design, number of impellers and location within a tank, tank baffling and fluid viscosity Typically the power number is shown for mixing in fully turbulent flow
Get PricePo is the impeller s power number and it is a drag coef- ficient that is determined by the geometry of the impeller blade width, blade angle, number of blades and so on..
Get Price2017-8-8Po is the impellers power number and it is a drag coef-ficient that is determined by the geometry of the impeller blade width, blade angle, number of blades and so on.. The primary flow generated by an impeller is calculated from Equation 2 QFl N D3 2 Fl is the impellers flow, or pumping number.
Get PriceEstimation of the power consumption of mixing impel-lers in Newtonian liquids has been made possible by Rushton et al.10 and Nagata et al.9. For non-Newtonian liquids, however, only a few re-ports have been presented236 and no reports are found for a ribbon impeller that is effective for the mixing
Get Price2020-1-8A power number is a characteristic of an impeller geometry that can be used to calculate the impeller power. Knowing the impeller power number, fluid density, rotational speed, and impeller diameter, the impeller power can be calculated for any size impeller with the same geometry number of blades, blade width, etc.
Get Price2013-7-19Design of Multiple Impeller Stirred Tanks for the Mixing of Highly Viscous Fluids Using CFD Jolle Aubin Catherine Xuereb Laboratoire de Gnie Chimique UMR CNRS 5503 5 rue Paulin Talabot, BP-1301, 31106 Toulouse Cedex 1, France Aubin J. and Xuereb C., Desgin of Multiple Impeller Stirred Tanks for the Mixing of Highly Viscous
Get PriceThe quality of mixing depends on the effective energy input by unit mass or unit volume of fluid. It has been found, for example, that the rate of oxygen transfer in aerated fermentors equipped with turbine mixers is nearly proportional to the net mixing power input per unit volume of broth Hixson and Gaden, 1950.The relationship between mixing power and the type, dimensions and operation ...
Get PriceKey Words Mixing, Mixing Vessel, Impeller, Mixing Time, Power Number, Discharge Flow Rate Interrelations amongthe non-dimensionalmixing time, the powernumberand the discharge flow rate numberfor baffled mixing vessels are experimentally investigated for paddles and
Get Price2015-9-22Design of multiple impeller stirred tanks for the mixing of highly viscous fluids using CFD ... Concerning power consumption, a comparison of the product of the power number, Np , and ReNp Re shows that the downpumping and up-pumping congurations are ...
Get Price2006-10-5Impeller design for mixing of suspensions Tom Jirout, Frantiek Rieger Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technick 4, 166 07 Prague 6, Czech Republic Abstract This paper deals with effect of impeller type on off-bottom particle suspension. On the
Get PricePropeller turbine mixer design calculator solving for power requirement given laminar flow, mixing constant, fluid dynamic viscosity, revolution per second and impeller diameter
Get PriceButterfly impellers used for processing of viscoelastic fluids. Low impeller Power number Po due to low blade area.. Maximum shear rates of 17 s 1 in region between impeller and wall at N60 rpm.. Mixing times longer in viscoelastic fluids due to elastic effects.
Get Price2020-1-6Impellers. 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.
Get PricePower number data for different type of impellersturbines, under a give set of conditions are documented in various technical literature. Typical values of power number N p are Radial flow turbines, such as Rushton, Jacobs, Smith, Hjorth, Bakker 2,5 to 6,5 Power Number decreases with an increase in Reynolds number.
Get Price2019-12-12The power number N p also known as Newton number is a commonly used dimensionless number relating the resistance force to the inertia force. The power-number has different specifications according to the field of application. E.g., for stirrers the power number is defined as
Get PriceEffect of the type and number of high-speed impellers installed on a common shaft on the power characteristics was investigated in water and glucose solutions of different concentration. Different configurations of the Rushton or Smith turbines, pitched blade turbines, propeller, and A 315 impeller
Get Price2012-8-14reverse mixing ReFR ranged from 4 to 150. The oscillation frequency f was as follows f 0.115 Hz, f 0.23 Hz and f 0.46 Hz On the basis of changes in torque the average value of the torque for forward-reverse mixing TFR, average impeller rotational speed NFR, forward-reverse mixing power PFR and power number PoFR for unsteady forward-reverse agitation were determined.
Get PriceReynolds number is a basic principle of fluid mechanics and plays a prominent role in industrial mixing. The Reynolds number concept was first introduced over 150 years ago by George Gabriel Stokes, a mathematics professor at Cambridge.
Get PriceImpellers Impellers are most widely used Agitatiors, among all types, Straight Blade and InterMig Impellers are discussed in this post. Straight Blade Impeller Cleveland Eastern offers a wide range of mixing impeller designs for laboratory, pilot plant and production blending. Sizes range from 3 diameter propellers to 10 diameter special purpose impellers.
Get Price2013-4-18Another dimensionless quantity commonly used to characterize impellers is the power number, NP. It has been shown through experimental data that the power consumption of an impeller, P, is proportional to the cube of the rotational speed of the impeller, the fifth power of the impeller diameter, and the density of the fluid.
Get PriceImpellers. INDCO offers a multitude of mixing impeller designs for industrial mixing and high shear dispersion. Hydrofoil impellers, marine style mixing propellers, axial flow turbines, and radial flow turbines are all flow-producing impeller designs. Dispersion blades convert energy primarily to shear and, therefore, produce a different result. At high tip-speeds driven by sufficient ...
Get Price2016-3-31number is about 30. The Impeller Reynolds number is about 10 times greater. Therefore, if you had this parameter only at our disposal, you may have supposed that you are close to the transitional flow regime. For a laminar flow regime, one of the most important characteristics of mixing is the Circulation flow rate .
Get Price2012-8-14rotational speed of the impeller is limited by mechanical vibration and air entrainment so the bench scale flow regime is often limited to transitional instead of turbulent flow. The jar test uses a large paddle impeller with a peak energy dissipation, or mixing intensity, 4-6 times higher in the impeller zone than in the bulk of the tank.
Get PricePropeller turbine mixer design calculator solving for Reynolds number given impeller diameter, fluid dynamic viscosity, revolution per second and liquid mass density Propeller Turbine Mixer Design Calculator - Mixing Reynolds Number
Get Price2003-10-7POWER CONSUMPTION OF AGITATORS Flow number 1 tan 3 3 a Q a a a nD q N q nD q K D n k D W v S E S It is a function of the volumetric flow rate and the kinetic energy Values of N Q HE-3 high-efficiency impeller 0.47 Disk turbine 1.3 Four-blade 45q turbine WD 0.87 a16 Marine propellers square pitch 0.5 N Q Impeller Power number 2 2 2 ...
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