Newtonian and Inelastic Non-Newtonian Flow across Tube Banks

Abstract

Newtonian and inelastic non-Newtonian fluid flows across tube banks are analyzed by using two parallel-plate channel models. A simple parallel-plate channel model correlates the present and previous literature data on non-Newtonian fluids successfully, giving a single-valued correlation independent of tube spacings and the fluid rheology. Separate correlations are developed for staggered and inline arrangements. A comparison of a second model, the periodically converging-diverging channel flow, with experimental data shows that the flow does not expand from a minimum clearance to the maximum possible available space between tubes due to interaction of flow between them. It is further observed that the flow behavior index, n, has a marked effect on expansion ratio, D2/D1; the higher the pseudoplasticity of the fluid, the higher is the expansion. © 1987, American Chemical Society. All rights reserved.