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Temperature development in the leakage flow of screw extruders
Author(s) -
Meyer H. E. H.,
Housz J. F. Ingen,
Gorissen W. C. M.
Publication year - 1978
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.760180409
Subject(s) - leakage (economics) , péclet number , materials science , mechanics , drag , thermal , flow (mathematics) , thermodynamics , physics , economics , macroeconomics
Temperature distribution at the exit of the leakage gap is of interest for a number of problems. For the calculation of temperatures, the leakage flow may be considered to be a pure drag flow to a good approximation. In the Newtonian case, thermal development length may be expressed in terms of gap height as L ≈ 3/8 Pe · δ;usually this is less than the available gap length. Pe is the Peclet number and δ the height of leakage gap. Therefore the existing flow may be considered fully developed. For power law fluids, numerical calculations lead to results of the same order. Martin's results therefore may be applied to the flow at the exit of the leakage gap.