Ultrasound propagation in two-layer gas flow

Mahjabin Taskin, Takuya Kido, Masahiro Inoue, Yoshimine Kato

    研究成果: ジャーナルへの寄稿学術誌査読

    2 被引用数 (Scopus)


    The ultrasonic signal propagation in two-layer gas flow was studied. The intensity degradation of the signal was observed while the signal was propagating through the air-hydrogen-air two-layer gas flowing system. The concentration of flowing hydrogen (H2) gas was measured using ultrasound from the exterior of the pipe, and it was calculated that the intensity degradation of signal did not simply depend on the H2 concentration, however, the intensity varied every second. Schlieren photography was taken to visualize the motion of H2 gas after injecting into the flowing air of 2 m/s. It was observed that high concentration H2 gas was flowing in the middle of the airflow without quick diffusion into the air. A two-dimensional air-H2-air gas flow model was considered where 100% H2 was flowing in the middle of the airflow, and the gas layers were separated by two fluctuated interfaces. According to the calculation using this model, only limited conditions of the signals can reach to the receiver due to the refraction at the fluctuating air-H2-air gas interfaces while propagating. It was found that the receiver could hardly detect the signals; hence, the intensity of the signal looked degraded.

    ジャーナルInternational Journal of Hydrogen Energy
    出版ステータス出版済み - 10月 18 2019

    !!!All Science Journal Classification (ASJC) codes

    • 再生可能エネルギー、持続可能性、環境
    • 燃料技術
    • 凝縮系物理学
    • エネルギー工学および電力技術


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