Sizing a Mixer. The diameter of the blade should be 1/3 the diameter of the tank. For heavier materials, the blade diameter should be increased to allow maximum flow for the most efficient mixing.
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How do I choose a tank agitator?
For proper mixing and suspension of solids, the mud agitator must be properly sized and installed. 2. Determine available electric power – 440V/460V/380，60HZ , 380V/400V/415V，50HZ or customized.
How do you calculate energy mix?
Power = Np * n3 * d5 * sg * K
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.
How is torque calculated in a mixer?
The torque is in inch-pounds, the coefficient is 6.8 times 10 to the -8 power (0.000000068) includes your viscous power number, times the viscosity in centipoise, times the rotational speed in rpm, times the impeller diameter in inches cubed.
What should be the distance of impeller from the bottom of the tank?
The ratio C/T indicates the amount of clearance at the bottom of the tank. The normal range of C/T is between 0.1 – 0.4. Bottom clearance may also be defined by the impeller diameter. For high shear mixing, 1 D off bottom is optimal.
How do you size a tank agitator?
Things you need to know is the Batch Volume ( V ), Type of Agitator, Agitator to vessel dia ratio ( D/T ), Scale of Agitation, Fluid Density ( rho ) and Fluid viscosity ( myu ). Agitator Dia ( D ) = D/T x Teq. Bulk Velocity ( Vc ) = 6 x Scale of Agitation ft/min. = 0.03048 x Scale of Agitation m/sec.
How do you size an agitator motor?
Agitator speed is then determined using relation Nq = Q/ND3, where N is the Agitator speed. Reynolds number is calculated using relation, Re = D2Nρ/μ and a new Pumping number is determined using generic agitator curves.
How much power does a mixer consume?
The rated power of a mixer grinder is approximately 500 watt. If you use your mixer grinder for 1 hour daily it will consume 0.5 kWh of electricity in a day and 15 kWh of electricity in the entire month.
How do you find power per unit volume?
P/V can be converted from the impeller power number using the following equation: P/V = (Np × p × N³ × d5)/V with Np being the impeller power number, p the density of water (1,000 kg/m³), N the agitation speed (rps), d the impeller outer diameter (m), and V the vessel’s full working volume (m³).
What is the unit of power density?
Power density is quantified as the amount of power processed per unit volume or unit area. The most typical units are Watts per cubic meter (W/m3), Watts per cubic inch (W/in3), Watts per square meter (W/m2), or Watts per square inch (W/in2).
How much torque do I need?
To calculate load torque, multiply the force (F) by the distance away from the rotational axis, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.
What is the formula to calculate torque?
The magnitude of torque is equal to the product of the magnitude of the force and the lever arm. The dimensional formula for force is [M¹L¹T⁻²] while for a lever arm it is [L]. Hence, the dimensional formula for torque is [M¹L²T⁻²].
What is mixing torque?
If the driving force of a mixer is rotational, then horsepower is secondary to torque as the force that drives the pumping and performs the actual mixing. Therefore torque, or torque per equivalent volume, is what you are investing in when purchasing a mixer.
How many blades should an impeller have?
The number of blades for radial impeller of centrifugal pump is taken up to 12. In this paper the numerical analysis has been carried out for a number of impeller using different number of blades, but the impeller size, speed and blade angle being identical.
How does impeller size affect flow rate?
The speed and diameter of the impeller determines the head or pressure that the pump can generate. The rotational speed and height of the impeller blades determines the flow that the pump can accommodate [4, 5]. The design of the impeller diameter is critical because it affect the performance of the centrifugal pump.
How do you calculate the power of an agitator?
All replies (3)
- For required power calculations of Agitators,selection of the type of impeller is very important to achieve required agitation power.
- Re = ρ*N*d5/ µ
- From generic agitator curve, as shown in attached figure .
- Also ,Agitator Speed , N =Q / ( Nq x D x D x D ),
What is agitation scale?
The basic premise of the “scale of agitation” is that a value of 1 represents the minimum intensity necessary for complete motion of the liquid; a value of 10 represents the maximum practical intensity, although higher intensities might be used for extreme cases.
How do you calculate agitation speed?
Reynolds number, Froude Number, Power per Volume, Pumping Rate, Pumping Velocity, Scale of Agitation. Reynolds Number: Nre = D x D x N x rho / myu. Pumping Velocity: Vs = Q / A.
S = ( V2 / V1 ) ^ (1/3).
| PARAMETER | SCALING EXPONENT |
|---|---|
| Power per Volume | 2/3 |
| Froude Number | 1/2 |
| Shaft Speed |
What is power number of agitator?
Power Number is a dimensionless parameter based on the power in Watt consumed by the agitating rotor = impellers for the SUB and turbines for the SUF.
What is d’t ratio agitator?
Under normal competitive bidding situations, an agitator vendor will tend to quote the lowest capital cost design, which in this case would be about a D/T of 0.3. However, when the present worth of electric power is taken into account, a D/T ratio of 0.4 or 0.5 may be a better choice.
What is agitator sweep diameter?
Diameter of Agitator: Usually the diameter of agitator depends on the Diameter of the vessel, It is generally 1/3rd the diameter of the tank for Marine Propeller, Axial flow turbine, Turbo Propeller, Disc Blade turbine, Flat Blade turbine, Backward Blade turbine.