Flowmeters, axial flow transverse momentum

Axial-Flow Transverse-Momentum Mass Flowmeter. 10-19... 

General Principles There are two main types of mass flowmeters (1) the so-called true mass flowmeter, which responds directly to mass flow rate, and (2) the inferential mass flowmeter, which commonly measures volume flow rate aud flmd density separately. A variety of types of true mass flowmeters have been developed, including the following (a) the Maguus-effect mass flowmeter, (b) the axial-flow, transverse-momentum mass flowmeter, (c) the radial-flow, transverse-momentum mass flowmeter, (d) the gyroscopic transverse-momentum mass flowmeter, aud (e) the thermal mass flowmeter. Type b is the basis for several commercial mass flowmeters, one version of which is briefly described here. 

Axial-Flow Transverse-Momentum Mass Flowmeter This type is also referred to as an augiilar-momeutum mass flowmeter. One embodiment of its principle involves the use of axial flow through a driven impeller aud a turbine in series. The impeller imparts augiilar momentum to the fluid, which in turn causes a torque to be imparted... 

Axial-Flow Transverse Momentum Mass Flowmeter. Figure 8.15 shows a schematic of an axial flow transverse momentum flowmeter. Substantially all of the fluid flows through both the impeller and the turbine. The impeller and the turbine are geometrically similar cylinders mounted in a cylindrical flow conduit on an axis coinciding with the conduit centerline. Each element is mounted on a separate shaft. Both the impeller and turbine are composed of several straight vanes located at the periphery of the elements and parallel to the centerline of the conduit. A means is provided for measuring the torque on the turbine shaft. If the impeller were locked (not rotating), the torque on the turbine shaft would be zero. 

Fig. 8.15. Axial flow transverse momentum mass flowmeter.

Elbow Axial Flow Transverse Momentum Flowmeter. If Eq. (8.18) is... 

All such meters are direct mass flowmeters since the reaction of their primary element is proportional to the momentum of the stream. Each of these flowmeters imposes a momentum on the fluid stream at right angles to the axial (longitudinal) flow of the stream. These transverse momentum flowmeters can be classified as either axial flow, radial flow, or gyroscopic. Since each of these classes is basic, several variations in mechanical design and primary element reaction-detection have been devised. Some variations will be discussed under each class. 

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