Analysis of magnetic-thermal-fluid coupling characteristics in electromagnetic induction heating devices
The method of multivariate coupling field simulation of magnetocaloric in flow was adopted to studied multiphysics related eigenvalues in the induction heating system such as different coil structures,driving conditions influence wall ohmic losses,temperature eigenvalues,and magnetic field strength.The results indicate that coil structure and driving conditions have various degrees of influence on the magnetic field and temperature field.The wall ohmic losses are positively correlated with current amplitude,current frequency,and coil turns,and negatively correlated with the distance between the coil and the pipeline center.As the current amplitude increases from 100 A to 180 A,the heating power increases from 167 W to 3 223 W,and the average outlet temperature increases from 20.5 ℃ to 28.6 ℃.The current density and magnetic flux density in the pipe wall are more concentrated in the thin layer of the pipe wall with the current frequency increasing in the coil,and the maximum current density in the stainless steel surface increases from 1.29 × 106 A/m2 to 1.25 × 108 A/m2 with the coil frequency increasing from 0.05 kHz to 20 kHz.When the current frequency is 0.05 kHz,the maximum magnetic flux density is 0.5 T,and when the current frequency is 20 kHz,the maximum magnetic flux density is 4.8 T.
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