Document Type


Date of Award


Degree Name

Master of Science in Chemical Engineering - (M.S.)


Chemical Engineering and Chemistry

First Advisor

Wing T. Wong

Second Advisor

Gordon Lewandowski

Third Advisor

Chen-Chong Lin


Polymer processing, involving two or more components, has become more popular recently in industrial plants. However, product Quality is affected very much by the fluid stability. Some theoretical and experimental results concerning Newtonian and non-Newtonian flow in rectangular coordinates, have been published, and the fluid-fluid interfaces were observed to be unstable by some researchers.

In this paper, the linear stability of bicomponent non-Newtonian fluids flowing in a cylindrical tube was investigated by using the Ellis model. Only the very long wave and the axisymmetric disturbances were considered. The Ellis zero-shear-rate viscosity ratio, m( = η02 / η01 )destabilizing. The half-zero-shear-rate-viscosity stress ratio, γ ( = τ01 /τ02), was shown to have a stabilizing effect. The power factor, α1 and α2, have monotonous destabilizing effects. Surface tension, in general, will play a stabilizing role at the fluid-fluid interfaces.



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