Flow structure, heat transfer and scaling analysis in the case of thermo-magnetic convection in a differentially heated cylindrical enclosure

21st Fluid Mechanics Conference

物理学;力学

Fornalik-Wajs, E.^1 ; Filar, P.^2 ; Wajs, J.^3 ; Roszko, A.^1 ; Pleskacz, L.^1 ; Ozoe, H.^4

AGH University of Science and Technology, Department of Fundamental Research in Energy Engineering, Al. Mickiewicza 30, 30-059 Krakow, Poland^1

Siltronic AG, Hanns-Seidel-Platz 4, 81737 München, Germany^2

Gdansk University of Technology, Department of Energy and Industrial Apparatus, ul. Narutowicza 11/12, 80-233 Gdansk, Poland^3

Kyushu University, Kasuga Koen 6 1, 816 8580 Fukuoka, Japan^4

关键词: Cylindrical enclosure;    Magnetic convection;    Magnetic Rayleigh number;    Nusselt number correlation;    Paramagnetic fluid;    Scaling equations;    Thermal measurements;    Two-dimensional flow;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/530/1/012041/pdf
DOI  :  10.1088/1742-6596/530/1/012041

学科分类：力学，机械学

来源: IOP

【 摘 要 】

The experimental, numerical and scaling analysis in the case of thermo-magnetic convection in a thermosyphon-like enclosure filled with a paramagnetic fluid is presented. Visualization of temperature field together with the numerical simulation gave an information about the flow structure, which indicated "finger-like" structures of hot and cold streams advecting each other. Their number depended on the Rayleigh number and also on the magnetic induction. In the basis of thermal measurements the average Nusselt number was determined for various strength of magnetic field and in presented configuration increasing magnetic field caused increase in the Nusselt number. With the assumptions of two dimensional flow and the constant fluid properties, in the studied temperature range, the scaling analysis led to the Nusselt number correlation in dependence on the thermo-magnetic Rayleigh number. Very good agreement between the experimental results and scaling equation was observed.