Suppose the speed of sound in the static fluid is c, the speed of fluid flow is u, and the propagation distance is L. When the sound wave is in the same direction as the fluid flow (that is, the direction of the flow), its propagation speed is c+u; otherwise, the propagation speed is cu .Place two sets of ultrasonic generators and receivers (T1, R1) and (T2, R2) at two places …
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