What type of flow metering device consists of a body, flow straightener, hub, and rotor?

The type of flow metering device that consists of a body, flow straightener, hub, and rotor is the turbine flowmeter. Turbine flowmeters operate on the principle of measuring the flow rate of a fluid by utilizing a rotor that spins as fluid flows through the device. The components mentioned—such as the body that houses the internal parts, the flow straightener to provide a uniform flow profile, the hub that supports the rotor, and the rotor itself that rotates with the flow—are essential for the accurate measurement of fluid flow.

In operation, the speed of the rotating turbine is directly proportional to the flow rate, enabling precise measurement of fluid volume passing through it. This design allows for high accuracy and is commonly used in various industries where precise flow measurement is needed, such as in water, chemical, and oil applications.

Other flow metering devices, such as vortex shedding flowmeters, magnetic flowmeters, and Parshall flumes, utilize different principles and constructions which do not include the specific combination of components listed in the question. For instance, vortex shedding flowmeters rely on the principle of the generation of vortices, magnetic flowmeters measure flow of conductive liquids using magnetic fields, and Parshall flumes are open channel flow measurement devices shaped