Abstract
To improve the measuring accuracy of the ultrasonic flowmeter for gaseous hydrogen, the effect of flow channel geometry on the internal flow has been investigated. The internal flow fields were analyzed by numerical analysis, verified by experiments using PIV. For the same flow rate, the distribution of the axial velocity has no difference between the straight and exponential channel models. For the same channel model, the velocity distributions in the cross-sectional and streamwise directions are independent of the channel diameter.
