Induction pump - QuickField simulation example
In the induction pump the alternating magnetic field induces eddy currents in the liquid metal. Interaction between the magnetic field and the currents generate the force which moves the metal through the pipe. The eddy currents value depends on the metal conductivity, which depends on temperature. Calculate the pump force and pressure as functions of temperature.
How to find electromagnetic force generation in induction pumps?
Answer Typical applications Geometry
Given
Task
Solution
Results
Reference: Inductive pump
Engineering question
Set up an axisymmetric QuickField AC Magnetics problem for an induction pump and evaluate electromagnetic force generation from computed field results.
electromagnetic induction pumps, magnetohydrodynamic pumps, liquid metal pumps
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Simulation problem
Problem Type
Axisymmetric problem of AC magnetics.
Winding current density j = 6 A/mm²
Frequency f = 50 Hz
Magnetic permeability of the steel core μ = 200;
Conductivity of the liquid metal σ - depends on temperature, as shown on the plot below;
Calculate the pump force and pressure as functions of temperature.
Due to the axial symmetry only the upper half is presented in the model.
As the induced current rapidly fades outside the inductor it is possible to limit the model z-length by 400 mm.
Conductivity vs. temperature dependency was specified for the 'liquid metal' block.
The series of problems was solved for the temperature range 600-900°C. The mechanical force acting on the liquid metal was calculated at each step.
Pressure [Pa] = Force [N] / Cross-section area [m²]
Eddy currents distribution in the liquid metal
Temperature, °C
Force, N
Pressure, kPa
100
41
14.5
200
30
10.5
600
23
8.1
900
18
6.5
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