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Analysis of pressure transducer data from screw extruders
Author(s) -
McKelvey James M.,
Wheeler Norton C.
Publication year - 1963
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760030209
Subject(s) - materials science , transducer , pressure sensor , isothermal process , plastics extrusion , extrusion , newtonian fluid , mechanics , flow (mathematics) , acoustics , volumetric flow rate , viscosity , mechanical engineering , composite material , thermodynamics , physics , engineering
Based on the simplified, flat‐plate, isothermal, Newtonian flow model of the screw pump, an expression for pressure as a function of time at a fixed point on the extruder barrel has been derived. This expression predicts a periodic saw tooth pressure cycle under most flow conditions. It also establishes the flow conditions under which an inversion of the saw tooth cycle will occur. Pressure transducer data, in conjunction with extrusion rate data, can be used to calculate the average fluid viscosity in a region near the transducer.