1. n. [Production Logging]

A laboratory instrument for investigating the characteristics of fluid flow in pipes and for studying the response of production logging instruments to this flow. The fluids are circulated continuously in a loop, passing through one main measurement section that can be placed at different deviations from vertical through horizontal. Fluid properties, holdups and velocities can all be varied. Flow loops are essential for the study of multiphase flow and the development of new production logging measurements.

See: flow regime,  flow structure,  fluid flow,  holdup,  multiphase flow,  production log,  velocity