Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 27626-27634 |
| Number of pages | 9 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 44 |
| Issue number | 50 |
| DOIs | |
| Publication status | Published - Oct 18 2019 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology
Cite this
Ultrasound propagation in two-layer gas flow. / Taskin, Mahjabin; Kido, Takuya; Inoue, Masahiro; Kato, Yoshimine.
In: International Journal of Hydrogen Energy, Vol. 44, No. 50, 18.10.2019, p. 27626-27634.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ultrasound propagation in two-layer gas flow
AU - Taskin, Mahjabin
AU - Kido, Takuya
AU - Inoue, Masahiro
AU - Kato, Yoshimine
PY - 2019/10/18
Y1 - 2019/10/18
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85072562152&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072562152&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2019.08.192
DO - 10.1016/j.ijhydene.2019.08.192
M3 - Article
AN - SCOPUS:85072562152
VL - 44
SP - 27626
EP - 27634
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 50
ER -