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The flow of any fluid (liquid or gas) through a continuous container (process vessel) or conduit (piping or tubing).



Related Terms

AREA METER

A mechanism to measure fluid flow rate through a fixed-area conduit by the movement of a weighted piston or float supported by the flowing fluid; includes rotameters and piston-type meters.

MASS FLOW RATE

The mass of fluid flowing through the cross-section of a conduit in unit time.

FLOW VISUALIZATION

Method of making visible the disturbances that occur in fluid flow, using the fact that light passing through a flow field of varying density exhibits refraction and a relative phase shift among different rays.

SUPERFICIAL PHASE VELOCITY

The flow velocity of one phase of a multiphase flow, assuming that the phase occupies the whole conduit by itself. It may also be defined by the relationship (Phase volume flow rate / Pipe cross-section).

PLUMMET

A loose-fitting metal plug in a tapered rotameter tube which moves upward (or downward) with an increase (or decrease) in fluid flow rate upward through the tube. Also known as float.

THREE-WAY VALVE

Multi-orifice (opening) flow control valve with three fluid flow openings.

ANEROID FLOWMETER

A mechanism to measure fluid flow rate by pressure of the fluid against a bellows counterbalanced by a calibrated spring.

BYPASS FILTRATION

A system of filtration in which only a portion of the total flow of a circulating fluid system passes through a filter at any instant or in which a filter having its own circulating pump operates in parallel to the main flow.

SAYBOLT UNIVERSAL SECONDS (SUS)

The time in seconds required for 60 cubic centimeters of a fluid to flow through the orifice of the Standard Saybolt Universal Viscometer at a given temperature under specified conditions. (ASTM Designation D 88.

VOLUME FLOW RATE

The volume of fluid flowing through the cross- section of a conduit in unit time at the pressure and temperature prevailing in that section.

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