AMPLITUDE REDUCTION AND PHASE LAG IN FLUIDIZED-BED PRESSURE MEASUREMENTS

Dual static pressure probes (DSPPs) provide detailed information on fluidized-bed hydrodynamics. However, the geometry of the DSPP and the type of transducer across which the probe stems are connected have a profound influence on the measured differential pressure. Analysis shows that it is important to choose a transducer with low dead volumes and even more important to ascertain that the dead volumes associated with each transducer tapping are equal. Partial blockage of one of the tubes will also precipitate erroneous data collection. Experimental results support the analysis.