Simulation Analysis for HB-Line Dissolver Mixing

摘要

In support of the HB-Line Engineering agitator mixing project, flow pattern calculations have been made for a 90(sup o) apart and helical pitch agitator submerged in a flat tank containing dissolver baskets. The work is intended to determine maximum agitator speed to keep the dissolver baskets from contacting the agitator for the nominal tank liquid level. The analysis model was based on one dissolver basket located on the bottom surface of the flat tank for a conservative estimate. The modeling results will help determine acceptable agitator speeds and tank liquid levels to ensure that the dissolver basket is kept from contacting the agitator blade during HB-Line dissolver tank operations. The numerical modeling and calculations have been performed using a computational fluid dynamics approach. Three-dimensional steady-state momentum and continuity equations were used as the basic equations to estimate fluid motion driven by an agitator with four 90(sup o) pitched blades or three flat blades. Hydraulic conditions were fully turbulent (Reynolds number about 1 x 10(sup 5)). A standard two-equation turbulence model ((kappa),(var-epsilon)), was used to capture turbulent eddy motion. The commercial finite volume code, Fluent (5), was used to create a prototypic geometry file with a non-orthogonal mesh.