超音波流速分布計測法による液体金属流動計測 : 第2報,液体ガリウム層における熱対流運動の可視化(流体工学,流体機械)

概要

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Thermal convection in liquid gallium layer was investigated as a fundamental study for Rayleigh-Benard convection in low Prandtl number fluid using ultrasonic velocity profiler, UVP. Temperature dependence of sound speed in liquid gallium was measured for a velocity profile measurement by UVP. Measured velocity profiles visualized a convective motion in the liquid gallium layer, and it is a roll shape motion. Spatio-temporal velocity profile showed that there are two types of spatial fluctuation of the convection roll, and there are 3 modes on the number of convection rolls in the fluid layer, 2, 3 or 4 rolls. Two axes-simultaneous velocity profile measurement clarified that expand and contraction of convection roll has a phase delay on the direction of the rotating axis of the roll.
社団法人日本機械学会の論文
2006-06-25