Answer :

Final answer:

Fixed-bore metering devices include capillary tubes and orifice meters, which are used for measuring flow rate and viscosity in various industrial applications.

Explanation:

Two types of fixed-bore metering devices are capillary tubes and orifice meters. Capillary tubes are widely used when working with Newtonian fluids to measure flow rate through a narrow tube, usually made of glass, and can determine the viscosity coefficient using pressure differences. Orifice meters, commonly found in industries like oil, consist of a reservoir, an orifice, and a receiver to measure viscosity in units of efflux time. They are also used in flow measurement by creating a constriction in the discharge pipe to determine flow rates, especially for larger pumping rates.

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