The measuring principle of a movable tube flowmeter is based on Newton's law of motion, namely, the time rate of the momentum increase of a system is equal to the force acting on it. Under the assumption that the velocity at the ends of the movable tube are uniform, the flow rate may be calculated theoretically regardless of viscosity of the fluid.
In the flowmeter, here reported, which we have named the perpendicular type, the inlet and outlet directions are perpendicular to each other. A flowmeter of this type has the merit that the flow rate is independent of the flow conditions (momentum, pressure, density and so on of the fluid) at one end of the movable tube. The merit seems to be especially useful for measurement of a compressible fluid.
Two trial flowmeters of different kinds are examined experimentally by differential pressure measuring method and force measuring method, and the results of experiments are in good agreement with the theory.
抄録全体を表示