Two-phase velocity and density in finite pipes by intrusive and nonintrusive instrumentation
Abstract
As part of the search for two phase flow measurement standards, an experimental study was conducted to compare several promising two phase instruments capabilities to measure nitrogen-water flow rates, velocities and densities at high pressure. Two phase quantities in large diameter finite length pipes (in the vicinity of bends) were measured by two nonintrusive means, (1) pulsed neutron activation (PNA) and (2) the gamma beam attenuation densitometer, and by three intrusive devices, (1) drag-disc turbine transducer rake (DTT rake), (2) a traversing turbine, and (3) a full flow turbine. Pipes of this large size are used in the loss-of-fluid test (LOFT) experimental reactor. The measured results indicated pronounced finite flow length effects, as well as an agreement between instruments used. The PNA technique showed promise as a standard method for two phase flow measurements. The nonintrusive methods produced accurate density and velocity values indicating that completely nonintrusive techniques can be used to measure mass flow.
- Publication:
-
Presented at the 27th Intern. Instrumentation Symp
- Pub Date:
- May 1981
- Bibcode:
- 1981inin.symp.....C
- Keywords:
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- Densitometers;
- Flow Measurement;
- Flow Velocity;
- Neutron Activation Analysis;
- Pipe Flow;
- Two Phase Flow;
- Gamma Ray Beams;
- Reactor Safety;
- Transducers;
- Turbines;
- Fluid Mechanics and Heat Transfer