power number for agitator

Agitator Power Requirement

Agitator Power Calculates agitator speed and power requirement for a given reactor geometry and mixture properties. Reactor Geometry Power Number (Np) Power, P is calculated using definition of power number. Power (P) = Np.ρ.N 3.D 5. Assuming loading of 80%, motor power required

Power number Wikipedia

The 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: = with P: power; ρ: fluid density; n: rotational speed; D: diameter of stirrer

Power Number an overview ScienceDirect Topics

For various values of power number Po and corresponding agitator speeds N beyond the laminar flow region calculate values of shear rate from equation 5.1. Read the corresponding values of apparent viscosity μ a from the log–log plot of μ a against and calculate the Reynolds number for mixing Re M for each value of N and Po.

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CHAPTER 9. AGITATION AND MIXING

POWER 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 (W/D 0.87 a)=1/6 Marine propellers (square pitch) 0.5 N Q Impeller (Power number) 2 2 2

[How To] Design an agitator Pharma Engineering

Power number = 0.5 [as per agitator curves] Power = Np x ⍴ x N^3 x d^5 = 0.5 x 1500 x (60/60)^3 x (1.6^5) = 7862.84 watts = 10.54 HP, Considering losses which might occur due to transmission, gland losses, coupling losses, they would attribute to ~ 25%, the efficiency would reduce to 75 %,

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Mechanical Agitator Power Requirements for Liquid Batches

Mechanical Agitator Power Requirements for Liquid Batches _____ Application Equations Mechanical agitator power requirements for liquid batches are calculated by determining the power number, N P, for a given system and correcting for motor, gearing and bearing losses. Design specification of the motor is then determined by

Effect of Agitator’s Types on the Hydrodynamic Flow in an

May 01, 2020· A comparison was present in Figure 14 of the variation of the power number N P, according to the baffle height (L/H = 0.83, 0.67, 0.5 and 0.33) of four agitator’s types (RT, CTB, DTBT and CTBT), the N P values almost constant for agitators (DTBT, CBT and RT) with (L/H = 0.33, 0.5 and 0.67) then increases slightly, one can also see, an

Types of Agitators, Agitator's Design and Significance

Number of agitators = (Maximum liquid height x specific gravity) / Diameter of tank. Gap between two Agitators = Liquid height / (Number of impellers 0.5). Basic Design Equations for a Vertical Vessel and Agitator: Vessel Volume = (pi x vessel dia x vessel dia x vessel length) / 4.0

Agitator Speed an overview ScienceDirect Topics

In fully turbulent conditions, with Reynolds number greater than 10,000, the agitator's power is proportional to fluid density, rotational speed, and impeller diameter. At small values of Reynolds number, below about 10, laminar conditions exist and power is proportional to fluid viscosity, rotational speed, and impeller diameter.

Mixing Expert :Power Number Unique Mixers & Furnaces Pvt Ltd

Jun 10, 2012· N p = Power number ρ = Density of liquid, kg/m 3 n Agitator speed measured in revolutions / second D a Impeller diameters in meters. Power number data for different type of impellers, under a give set of conditions are documented in technical literature.

Effect of Agitator’s Types on the Hydrodynamic Flow in an

Mixing Impeller Power ProQuip Mixers

May 13, 2019· The Fixed Mount agitator above produces 5 times the torque of the Portable. Accordingly, this agitator will have much larger components such as gearbox and shafting, and will provide a greater degree of agitation. For More Information on Mixing Impeller Power

Agitator Speed an overview ScienceDirect Topics

Calculated Power Number (Np) for turbines

P = Turbine power, Watts N p = Power Number ρ = Density of liquid, kg/m 3 n 3 = Agitator speed measured in revolutions / second D 5 = Impeller diameters in meters. Power Number data for different type of rotors turbines, under a give set of conditions are documented in various technical literature. Typical values of Power Number (N p) are:

Mixing Chemical Processing Expert Forum: Re: How do you

The calculation is easy. Getting good data to use in the calculation can be hard. The power number is a dimensionless group, so you need to be sure that the units cancel. For SI Metric: Np = P / (rho N^3 D^5) where P is power in Watts, rho is liquid density in kg/m^3, N is rotational speed in rev/s, D is impeller diameter in

Correlation of Power Consumption for Several Kinds of

3.5. Pitched Paddle and Propeller Impellers with Partial Baffle. The effects of the baffle length on the power consumption of a mixing vessel with several impellers were studied as shown in Figure 3.The power number was generally correlated with the baffle length, the number of baffles, and the baffle width [].The power number of the pitched paddle and the propeller impellers was

SCALE-UP OF MIXING SYSTEMS

The power required for mixing is P = N pρN3D5 A, where the Power number (N P) is a function of the Reynolds number [i.e., N P = f(N Re)]: N ND A Re = ρ µ 2 The plant must be provided with the viscosity of the product and its density after addition of the pigments. Example 8-5 A turbine agitator with six flat blades and a disk has a diameter

Short Term Training Programme On “Process Engineering

2. Agitator Design ..31 a. Introduction to Mixing Process Evaluation b. Calculation of Power requirement for Newtonian fluid c. Introduction to non-Newtonian fluid and power requirement for non-Newtonian fluids d. Problems and Solution on power number e. Shaft, Hub and Key Design By: Mihir P.Shah, DDU, Nadiad 3.

PUMPING CAPACITY OF PITCHED BLADE MULTI-STAGE

The effects of the blades number (six 6PBT and three 3PBT) and the distance between the impellers H 3 /d = 0.5 ÷ 1.25 of pitched blade multi- stage impellers (see Fig. 2) on the pumping ability have been investigated.

Process Engineering Don't get mixed up by scale-up

Aug 04, 2005· (Power number corrections differ with type of impeller.) Now suppose we want to duplicate our process results in an 84.0 in.-dia. tank with a 3,000 gal capacity using four-blade, pitched-blade turbines. As we will see while doing the calculations, the tank geometry and impeller type both change in the scale-up process. Such changes are common.

Information for Agitator / Mixer

Power required for agitation: Power depends on diameter of impeller, revolutions of agitator shaft, power number of impeller, number of impellers, density, content of solids and viscocity of liquid. Overhang of shaft and lower fixed bearing : The shaft is supported at the top end by bearing housing assembly.

Consider Hydrofoil Impellers for Laminar-Flow Mixing AIChE

The selection of an agitator impeller for mixing fluids in tanks is a widely researched field, with many resources available to study fluid flow. Conventional wisdom holds that medium-viscosity fluids in transitional flow are best mixed with a pitched-blade turbine power number, N P = P/ρN 3 D 5; pumping

Study the Effect Of Impeller Design On Power Consumption

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 only in the most general terms. this is partly due to the

Reliable agitators from EKATO tailored to your application

For more than 85 years, EKATO has stood for the highest level of development and manufacturing expertise in the field of agitator technology. Irrespective of size and complexity, the customer benefits and reliability of agitators is always the first priority.

Correlation of Power Consumption for Several Kinds of

Consider Hydrofoil Impellers for Laminar-Flow Mixing AIChE

Impellers EKATO

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.

chemineer

The last three designs listed in Table 1 are for an agitator run at a lower speed. The diameter of Aeration Number FIGURE 2. Comparison of the power W also increases, its rise is less than that of the narrow required to suspend solids in the blade impeller styles. If

Reliable agitators from EKATO tailored to your application

Washers With An Agitator Vs No Agitator: Which One To Choose?

Jun 23, 2020· Washing cycles involve the number of rotations required to remove dirt from clothes altogether. Washers with agitators can do up to 50% fewer cycles than those without agitators. This is because more water is used by a washer with an agitator. Without Agitators

Agitators by De Dietrich Process Systems

One-Piece Construction Agitators Product Description One-piece construction agitators have a restricted field of application because they need a large opening to be installed, and encounter additional issues including sealing problems, difficulty cleaning, and mandatory dismantling of

Propeller Turbine Mixer Design Calculator Mixing

power requirement (turbulent flow) Reynolds number >10000: mixing constant (turbulent flow) fluid mass density: rotation speed revolutions per second (turbulent flow) impeller diameter (turbulent flow)

PUMPING CAPACITY OF PITCHED BLADE MULTI-STAGE

The effects of the blades number (six 6PBT and three 3PBT) and the distance between the impellers H 3 /d = 0.5 ÷ 1.25 of pitched blade multi- stage impellers (see

AGITATION AND MIXING OF FLUIDS

Power characteristics of cl o se clearance agitators 1 ± anchor agitator (CVS 69 1014), 2 ± helical screw agitator with draught tube (CVS 69 1028), 3 ± e ccentrically placed helical screw agitator,4 ± h elical ribbon agitator (CVS 69 1029), 5 ± leaf agitato r (CVS 60 1016), 6 ± multi stage agitator

How do I calculate impeller speed of a bioreactor from

The ungassed power number (Np) of a single impeller is 5.2 and for the two impeller system the power number can be assumed to be twice that value. Power consumption of agitation is reduced when

Information for Agitator / Mixer

VisiMix Laminar. Example 1. 1

Nov 01, 2015· Circulation Power. After the main initial data are entered, simulation can be started. In order to evaluate general flow conditions in the tank, we start hydrodynamic simulation with pressing one of the Calculate> Flow characteristics menu options, for example Calculate>Flow characteristics> Reynolds number for flow (Fig.9). Figure 9.

Mixing Expert :Anchor Agitator Unique Mixers & Furnaces

What is an anchor agitator / impeller?. The anchor agitator/impeller is close clearance, radial flow impeller used for mixing of viscous liquids. The sweep diameter of the anchor impeller is generally 90 to 95 percent of the diameter of the vessel. Anchor-shaped impellers are used for liquid viscosities between 5000 and 50,000 cP.