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A flow model for non‐newtonian liquids inside a slot die
Author(s) -
Yuan SinhLuh
Publication year - 1995
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.760350704
Subject(s) - non newtonian fluid , newtonian fluid , shear thinning , mechanics , viscosity , reynolds number , power law , materials science , flow (mathematics) , power law fluid , die (integrated circuit) , thermodynamics , physics , mathematics , turbulence , statistics , nanotechnology
A one‐dimensional flow model for non‐Newtonian liquids inside a dual‐cavity slot die is presented. The model is capable of analyzing slot dies of any cavity shape, cavity taper, slot‐length variations, and slot‐gap variations. The proposed model incorporates a truncated‐power‐law model for the viscosity of non‐Newtonian liquids. According to flow models with power‐law approximation for liquid viscosity, the distribution of non‐Newtonian liquid through a slot die depends on the slot Reynolds number only. With our model, we find that the zero shear viscosity and the relaxation time of a non‐Newtonian liquid have large effects on its distribution. For non‐Newtonian liquids which are expected to experience shear‐thinning over portion of a slot die, it is concluded that a flow model with a truncated‐power‐law approximation for liquid viscosity be used to predict the liquid distribution from the die.