Title of article :
Direct numerical simulation of unstable stratified turbulent flow under a magnetic field
Author/Authors :
Satake، نويسنده , , Shin-ichi and Chikamasa، نويسنده , , Hidenori and Kunugi، نويسنده , , Tomoaki and Takase، نويسنده , , Kazuyuki، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
5
From page :
1326
To page :
1330
Abstract :
Liquid-metals as coolant material in a fusion reactor have a significant role in the design of advanced reactors. To understand it better, investigation of thermal behavior under a magnetic field is needed, such as in the case of low Prandtl (Pr) number fluid flow with buoyancy effect. In the present study, direct numerical simulations (DNS) for low Pr number fluid flow of turbulent heat transfer with buoyancy effect has been carried out under a magnetic field. In this simulation the values of Hartmann number Ha were kept as 0 and 6, and Prandtl number was 0.06. Grashof numbers were 1.3 × 106 and 4.8 × 106. Using DNS the parameters such as mean temperature, turbulent heat flux, and temperature variant were quantified. The Reynolds number for channel flow based on friction velocity, viscosity, and channel half-width was set to be constant as Reτ = 150. A uniform magnetic field was applied in a direction perpendicular to the wall of the channel. Using the simulation we could see that with an increase in heat transfer, thermal plume by the effect of buoyancy filled the entire region of the channel. In case of an applied magnetic field, it was seen that the turbulence became weak with the magnetic field, although the thermal transport was also increased by the buoyancy effect of the thermal plume.
Keywords :
MHD , Turbulent heat transfer , Low Prandtl number , Thermal plume , DNS
Journal title :
Fusion Engineering and Design
Serial Year :
2010
Journal title :
Fusion Engineering and Design
Record number :
2356745
Link To Document :
بازگشت