Advanced two-phase instrumentation program. Quarterly progress report, October--December 1977

Studies were conducted on three different instrument systems. One case involved the determination of the effect of screens and ramp orifices on the signal output from a drag disk, a turbine meter, and a gamma densitometer in an 8.9-cm-ID (3.5-in.) spool piece. Best results were obtained when only screens were used. In the second case, tests on the Auburn model 1080 conductance gauge indicated that it satisfactorily measured the void fraction of a two-phase mixture when no obstruction was placed upstream of the gauge. However, the placement of a ramp orifice upstream had a significant detrimental effect on the gauge. Finally, a fluidic device developed by Harry Diamond Laboratories was tested. This first-generation device was unsatisfactory because of large drifts in the signal which were caused by small changes in the fluid temperature.