| 摘要 |
<p>Apparatus and method for measuring mass flow rate of fluid materials including a rotationally oscillating probe attached to a support at one of its ends and adapted for extension into a flow stream. The fluid flowing thereabout interacts with the probe to produce an oscillatory Magnus lift force that is distributed along the portion of the probe exposed to the fluid stream and is directed substantially perpendicular to both the direction of fluid flow and to the rotational axis of the probe. The amplitude of the rotational oscillation is related to the fluid's mass flow rate and is determined using motion-responsive sensors. Electronic circuitry and processor means convert electrical signals generated by the sensors to develop an output signal proportional to mass flow rate. The probe assembly can be implemented in various forms including 'concentric tuning fork', 'linear rotational tuning fork' and 'parallel rotational tuning fork' arrangements. In alternative embodiments, additional sensing means integral to the probe assembly allow determination of the fluid's flow velocity (based on vortex shedding), fluid density, and fluid viscosity.</p> |
