air and helium. Calculate the duct length required to accelerate flow to Mach 1 for air and helium. Analyze and plot the duct length against Mach number at intervals of 0.1 (0.1 ≤ M ≤ 1). figures/: ...

His experiments in air duct flow measurements, which previously delved into ultrasonic flow measurement, led him to try mechanical means. That calls for some kind of turbine producing a signal ...