Numerical study of laminar magneto-convection in a differentially heated square duct

34th UIT Heat Transfer Conference 2016

Tassone, A.^1 ; Giannetti, F.^1 ; Caruso, G.^1

Department of Astronautical, Electrical and Energy Engineering, Nuclear Section, Sapienza, Università di Roma, Corso Vittorio Emanuele II 244, Roma

00186, Italy^1

关键词: Constant temperature;    Fully developed flows;    Hartmann numbers;    High velocity jet;    Liquid metal blanket;    Magneto convection;    Numerical results;    Uniform magnetic fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/796/1/012004/pdf
DOI  :  10.1088/1742-6596/796/1/012004

来源: IOP

【 摘 要 】

Magnetohydrodynamic pressure drops are one of the main issues for liquid metal blanket in fusion reactors. Minimize the fluid velocity at few millimeters per second is one strategy that can be employed to address the problem. For such low velocities, buoyant forces can effectively contribute to drive the flow and therefore must be considered in the blanket design. In order to do so, a CFD code able to represent magneto-convective phenomena is required. This work aims to gauge the capability of ANSYSCFX-15 to solve such cases. The laminar flow in a differentially heated duct was selected as validation benchmark. A horizontal and uniform magnetic field was imposed over a square duct with a linear and constant temperature gradient perpendicular to the field. The fully developed flow was analyzed for Gr = 105and Hartmann number (M) ranging from 102to 103. Both insulating and conducting duct walls were considered. Strong dampening of the flow in the center of the duct was observed, whereas high velocity jets appeared close to the walls parallel to the magnetic field. The numerical results were validated against theoretical and numerical results founding an excellent agreement.