Application of Fast Fourier Transform in thermo-magnetic convection analysis

21st Fluid Mechanics Conference

物理学;力学

Pyrda, L.^1

AGH University of Science and Technology, Faculty of Energy and Fuels, Department of Fundamental Research in Energy Engineering, Poland^1

关键词: Augmented heat transfers;    Heat transfer characteristics;    Magnetic convection;    Magnetic induction gradients;    Magnetic Rayleigh number;    Paramagnetic fluid;    Strong magnetic fields;    Transition to turbulence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/530/1/012060/pdf
DOI  :  10.1088/1742-6596/530/1/012060

学科分类：力学，机械学

来源: IOP

【 摘 要 】

Application of Fast Fourier Transform in thermo-magnetic convection is reported. Cubical enclosure filled with paramagnetic fluid heated from below and placed in the strong magnetic field gradients was investigated. The main aim of study was connected with identification of flow types, especially transition to turbulence. For this purpose the Fast Fourier Transform (FFT) analysis was applied. It was followed by the heat transfer characteristic for various values of magnetic induction gradient. The analysis was done at two Rayleigh numbers 7.89·105and 1.86·106with thermo-magnetic Rayleigh numbers up to 1.8·108and 4.5·108respectively. The presented results clearly indicate flow types and also demonstrate augmented heat transfer in dependence on magnetic induction gradient. Detailed analysis of flow transition to turbulent state was compared with transition line for natural convection reported in literature. The transition to turbulence in the case of thermo-magnetic convection of paramagnetic fluid was in very good agreement with transition in the case of natural convection.