mixing impeller power number

mixing impeller power number

Industrial Mixing Basics: Mixing Impeller Power - ProQuip

2019-5-13 · Power = Np * n3 * d5 * sg * K. The value of the dimensionless power number (Np) depends on several factors including impeller design, number of

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CHARACTERIZING IMPELLER PERFORMANCE IN STIRRED

2019-3-5 · POWER INPUT BY AN IMPELLER • In pipe flow: • Substitute Tip Speed for Velocity (U) as for Reynolds number: X is the Impeller Power number, Po. It is determined by geometry and flow regime: –Reynolds number –Impeller diameter / Blade width / Number of blades –Impeller position (relative to vessel base) –Baffles P PC1 = U3 X D2 N3D5

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Power Number - an overview | ScienceDirect Topics

Symbol as shown in Fig. 5.19 are as follows:. b—the width of impeller, m.. B W —the width of the baffle, m.. D—the diameter of the mixing chamber, m.. d—the diameter of the impeller, m.. f—the friction coefficient.. H—the height of the liquid level in the mixer, m.. N P —power number.. N P0 —power number without baffle.. N Pmax —power number with baffle.. r—the rotating ...

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Mixing Fundamentals - Mixing Fundamentals

graph below shows the relationship between viscosity and a mixing impellers power response - power draw increases with increasing viscosity. Every impeller has a Power Number vs. Reynolds Number curve similar to the one show below. The straight line portion at the left hand side is the laminar range which develops into the transition

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Mixing Power - an overview | ScienceDirect Topics

The power number P 0 is therefore constant: (7.3) P 0 = C o n s t a n t = P d 5 N 3 ... In this region, mixing power is proportional to the cube of the rotation speed and to the fifth power of impeller diameter. It is proportional to the fluid density but insensitive to viscosity. In high-power industrial mixers, more than one type of impeller ...

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Mixing: Impeller Performance in Stirred Tanks

2019-9-15 · Fl is the impeller’s flow, or pumping number. Both the power and flow numbers are measured ex-perimentally and typical values for commonly used im-pellers are given in Table 1. The average velocity in the impeller discharge can be calculated from Equation (3): U = Q A DIS (3) ADIS is the area through which the primary flow is pumped.

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Power Number (Np) examples for impellers - CerCell

Power Number is a dimensionless parameter used for estimating the power consumed by the agitating turbine and lost in the media. The lower the Power Number the better ability to disperse gas into the media without flooding or

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Study the Effect Of Impeller Design On Power

2020-11-17 · the impeller in the tank can have a significant impact on the power number in industrial mixing applications, the power consumption per unit volume of fluid is used extensively for scale-up, scale-down and design. in spite of its widespread use, the dependence of power consumption on impeller and tank geometry is dependent

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Mechanical Agitator Power Requirements for Liquid

2012-5-29 · Power number constants are listed in Table 2 for the various impeller types shown in Figure 3. Figure 5 and Table 1 are references for the various shape parameters that impact the power number. The example that follows will demonstrate how to determine motor power requirements for agitated liquid batches.

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Cell Culture Scale-Up in Stirred-Tank Single-Use

2019-1-9 · The power input/volume ratio (P/V) can influence oxygen transfer and culture mixing, as well. P/V can be converted from the impeller power number using the following equation: P/V = (N p × p × N³ × d5)/V with N p being the impeller power number, p the density of water (1,000 kg/m³), N the agitation speed (rps), d the impeller outer ...

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Power Number (Np) examples for impellers -

Power Number is a dimensionless parameter used for estimating the power consumed by the agitating turbine and lost in the media. The lower the Power Number the better ability to disperse gas into the media without flooding or

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MASTERING MIXING FUNDAMENTALS

2020-7-16 · relationship between viscosity and a mixing impellers power response - power draw increases with increasing viscosity. Every impeller has a Power Number vs. Reynolds Number curve similar to the one show below. The straight line portion at the left hand side is the laminar range which develops into

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Relationship between power number and

Based on the relationship between the power number and Reynolds number (power curve) of a rotationally reciprocating impeller operated at A=π/2, the power number is decreased inversely ...

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Consider Hydrofoil Impellers for Laminar-Flow Mixing |

2 天前 · The power number (N P) and the laminar power number constant (K L) act as a foundation to calculate the power. The literature gives values for K L of 27.4 for a typical hydrofoil and 43.2 for a pitched-blade turbine (1). The pumping number (N Q) is used to calculate impeller pumping; the published value of N Q is 0.214 for hydrofoils and 0.2954 ...

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(PDF) Mixing: Impeller performance in stirred

2022-2-8 · Po 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.).

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POWER CONSUMPTION OF MIXING IMPELLERS IN

Estimation 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 presented2'3>6) and no reports are found for a ribbon impeller that is effective for the mixing of viscous liquids8\

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Mechanical Agitator Power Requirements for Liquid

2012-5-29 · Power number constants are listed in Table 2 for the various impeller types shown in Figure 3. Figure 5 and Table 1 are references for the various shape parameters that impact the power number. The example that follows will demonstrate how to determine motor power requirements for agitated liquid batches.

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Power Number calculation - CerCell

P = Rotor power, Watt N p = Power Number ρ = Density of liquid, kg/m 3 n 3 = Rotor/agitator speed measured in revolutions / second D 5 = Rotor/impeller diameters in meters. Remember that Power Number decreases with an increase in Reynolds number. Read articles to be downloaded on the first page.

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I. Stirred Tank Reactor

2014-1-8 · c power number P Pg N ρnd = 3 qd discharge flow number for the impeller qd N nd == Nnmm=⋅=θ dimensionless mixing time qd = discharge flow rate in (cm3/s) θm = mixing time A. Re ≤ 10. Observed by tracers that the liquid in the impeller

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Cell Culture Scale-Up in Stirred-Tank Single-Use

2019-1-9 · The power input/volume ratio (P/V) can influence oxygen transfer and culture mixing, as well. P/V can be converted from the impeller power number using the following equation: P/V = (N p × p × N³ × d5)/V with N p being the impeller power number, p the density of water (1,000 kg/m³), N the agitation speed (rps), d the impeller outer ...

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MASTERING MIXING FUNDAMENTALS

2020-7-16 · relationship between viscosity and a mixing impellers power response - power draw increases with increasing viscosity. Every impeller has a Power Number vs. Reynolds Number curve similar to the one show below. The straight line portion at the left hand side is the laminar range which develops into

Read More

Power Number (Np) examples for impellers - CerCell

Power Number is a dimensionless parameter used for estimating the power consumed by the agitating turbine and lost in the media. The lower the Power Number the better ability to disperse gas into the media without flooding or

Read More

Impeller Mixing Simulations of Transitional Flow

2021-3-4 · with an A200 impeller at various Reynolds numbers. Power number and mixing time predictions are calculated and compared with available data and correlations. Conclusions Simulations for impeller mixing have a wide variety of applications, but must be tuned to produce meaningful results. The results

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POWER CONSUMPTION OF MIXING IMPELLERS IN

Estimation 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 presented2'3>6) and no reports are found for a ribbon impeller that is effective for the mixing of viscous liquids8\

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Mixing | Chemical Processing Expert Forum: Regarding an ...

2020-9-2 · The power number is based on the power required to turn the impeller, which could be measured in your case, but is likely to be less than 0.1 hp in a low viscosity fluid. An anchor impeller in a tank without baffles could have a turbulent power number of about 2.5. A power number of 0.6 is typical of a three-blade hydrofoil impeller. A ...

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Influence of Spacing of Multiple Impellers on Power Input ...

2019-11-13 · For comparison of the impeller performance of different systems and in scale up, a nondimensional method using the power number Po and Reynolds number Re is employed since the relationship between these two numbers normalizes the power input to the characteristics of an impeller 29. The power number is defined as

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I. Stirred Tank Reactor

2014-1-8 · c power number P Pg N ρnd = 3 qd discharge flow number for the impeller qd N nd == Nnmm=⋅=θ dimensionless mixing time qd = discharge flow rate in (cm3/s) θm = mixing time A. Re ≤ 10. Observed by tracers that the liquid in the impeller

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Propeller Turbine Mixer Design Calculator - Mixing ...

Reynolds number 10000. mixing constant (turbulent flow) fluid mass density.

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Cell Culture Scale-Up in Stirred-Tank Single-Use

2019-1-9 · The power input/volume ratio (P/V) can influence oxygen transfer and culture mixing, as well. P/V can be converted from the impeller power number using the following equation: P/V = (N p × p × N³ × d5)/V with N p being the impeller power number, p the density of water (1,000 kg/m³), N the agitation speed (rps), d the impeller outer ...

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AGITATION AND MIXING OF FLUIDS - cvut.cz

2018-5-1 · Impeller power consumption for mixing of suspension Po fPo Re su n3d5 P U su P nd U Re 2 U su c v U s 1 c v U. Scale-up of mixing processes. EXAMPLE: Blending efficiency of impellers Select type of high-speed impeller with minimum energetic requirements for continual blending (homogenization) of two miscible liquids A + B ( = 5

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