SwePub - sökning: L773:9781118291412

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1.	Kennedy, Mark W., et al. (författare) Improved short coil correction factor for induction heating of billets 2012 Ingår i: 3rd International Symposium on High Temperature Metallurgical Processing. - Hoboken, NJ, USA : John Wiley & Sons, Inc.. - 9781118291412 ; , s. 373-382 Konferensbidrag (refereegranskat)abstract To determine the heating rate of billets using 'short coils', an appropriate correction factor must be applied to the theoretical relationship. In 1945, Vaughan and Williamson published a semi-empirically modified Nagaoka coefficient applicable for moderate frequency induction heating processes (10 kHz). Recently it was demonstrated that the method of Vaughan and Williamson gives <10% error in the estimated power when heating aluminum billets at 50 Hz. In the present study, experiments have been conducted on aluminum billets in order to verify an empirical frequency corrected 'short coil' equation. Measurements of electrical conductivity (<± 0.5%), current (± 1%), heat (± 1-3%), and magnetic flux density (± 1-2%) have been performed. The results are compared with 1D analytical calculations, and 2D axial symmetric FEM modeling using COMSOL 4.2®. The frequency corrected equation has proven to provide accurate predictions of power (<4% error) within the frequency range 50 Hz to 500 kHz.

Kennedy, Mark W., et al. (författare)
Improved short coil correction factor for induction heating of billets
2012
Ingår i: 3rd International Symposium on High Temperature Metallurgical Processing. - Hoboken, NJ, USA : John Wiley & Sons, Inc.. - 9781118291412 ; , s. 373-382
Konferensbidrag (refereegranskat)abstract
- To determine the heating rate of billets using 'short coils', an appropriate correction factor must be applied to the theoretical relationship. In 1945, Vaughan and Williamson published a semi-empirically modified Nagaoka coefficient applicable for moderate frequency induction heating processes (10 kHz). Recently it was demonstrated that the method of Vaughan and Williamson gives <10% error in the estimated power when heating aluminum billets at 50 Hz. In the present study, experiments have been conducted on aluminum billets in order to verify an empirical frequency corrected 'short coil' equation. Measurements of electrical conductivity (<± 0.5%), current (± 1%), heat (± 1-3%), and magnetic flux density (± 1-2%) have been performed. The results are compared with 1D analytical calculations, and 2D axial symmetric FEM modeling using COMSOL 4.2®. The frequency corrected equation has proven to provide accurate predictions of power (<4% error) within the frequency range 50 Hz to 500 kHz.

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