水の微小発熱球周りの自然対流による非軸対称の流れ場と温度場の近赤外測定

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  • Near-infrared measurement of non-axisymmetric temperature and flow fields formed by free convection around a small heating sphere in water

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<p>This paper presents a method for measuring simultaneously non-axisymmetric three-dimensional (3D) temperature and flow fields in water formed by free convection surrounding a 1-mm-diameter heated sphere. This method is based on the temperature dependence of the absorption coefficient of water at a wavelength of 1150 nm. In the experiment, two-dimensional (2D) images of absorbance in two orthogonal directions were acquired. To reconstruct the 3D temperature distribution, we applied a non-axisymmetric Abel inverse transform to the 2D images. In addition, the flow velocity distribution was obtained by using a particle tracking method with the Lucas-Kanade algorithms. The results demonstrated that the evolution of the non-axisymmetric temperature distributions involved with free convection, and the flow velocities and directions reflected circulating flow with an upward plume.</p>

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  • 年次大会

    年次大会 2020 (0), J05224-, 2020

    一般社団法人 日本機械学会

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