サスペンションにおける自然対流の可視化画像計測 : 速度場, 温度場, 界面形状の同時計測による流動機構の解明

概要

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Natural convection of suspension was studied experimentally using both refractive index matching and laser induced fluorescent (LIF) technique. A rectangular test section was filled with particle suspension and was heated from a horizontal bottom, and two facing vertical walls were kept at the constant temperature. The images of the fluorescent particles were captured by a CCD camera through a sharp cut filter which separates emitted fluorescence from scattered excitation light. The flow velocity fields were analyzed quantitatively using PTV. Interface between particle-free fluid and suspension as well as temperature field were visualized simultaneously. It was suggested that two-layer convection cells were driven by heating and sedimentation of particles which drives convection in the overlying layer due to the release of the heated clear fluid at the interface.
社団法人日本機械学会の論文
1998-09-25