Abstract: Based on the principle of microturbulence’s genera- tion, the turbulent characteristic and parameters of the paper pulp flow inside microturbulence generators are investigated. The modeling and numerical equations of the flow medium — paper pulp are presented via proper assumptions on the pulp flow. Considering the microturbulence intensity and scale as parameters of the cost function, the computer fluid dynamics (CFD)-based optimal method for the structural design of microturbulence generators is proposed and applied in the design of two classical structure types: round changed to square pipes, and expanded ladder pipes. The results show that the microturbulent characteristic using expanded ladder pipes generators is better than that using round changed to square pipes generators. The numerical method and the conclusion are applicable and useful for the new design of microturbulence generators.

Key words: Computtion fluid dynamics (CFD), Microturbulence generator, Microturbulence intensity, Microturbulence scale, Numerical simulation, Optimal mechanical structure design