Construction of slender flexible filamentous particle model and numerical simulation method thereof

Abstract

The invention provides construction of a slender flexible filamentous particle model and a numerical simulation method thereof. According to the invention, a slender flexible filamentous particle model is constructed according to the physical characteristics of slender flexible filamentous biomass and is coupled with open source OpenFoam software; numerical simulation of the slender flexible filamentous particles in the fluidization processing process is realized; a numerical simulation result can be used for holographic simulation of motion characteristics of the slender flexible filamentousparticles in a fluidization processing process; the fluidization form and the mass and heat transfer efficiency of the slender flexible filamentous particles under different working conditions are vividly represented; tests prove that the simulation result of the method basically tends to be consistent with that of field experiment data; the reliability is high, the interaction mechanism of the long and thin flexible filamentous particles in the fluidization process is conveniently and efficiently captured and reproduced and is truly and objectively reflected, an effective solution is providedfor improvement and optimization design of fluidization processing equipment of the long and thin flexible filamentous particles, and the method has important theoretical significance and practical value.

Description

technical field [0001] The invention belongs to the technical field of computer numerical simulation, and in particular relates to the construction of a slender and flexible filamentous particle model and a numerical simulation method thereof. Background technique [0002] Elongated and flexible filamentous particles widely exist in the fields of tobacco, food processing, agriculture, biomass combustion, medicine, and environmental protection. The process broadly involves the flow of particles in two-phase or multiphase flows. Especially in the tobacco industry, the fluidized processing of shredded tobacco widely exists in operation units such as threshing and redrying, air drying, stem separation, loose cooling, impurity and dust removal, and material transportation. Its own motion characteristics are more complex than spherical particles, and the situation in two-phase or multi-phase flow is more complicated, involving many aspects such as material mechanics, fluid mechan...

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Problems solved by technology

[0003] However, shredded tobacco is soft, easily deformed, and its motion is complex and changeable. If traditional experimental methods are used to explore the motion characteristics of shredded tobacco during fluidization, the experimental period is long, the data collected is limited, and the cost is expensive.

In recent years, the simulation of gas-solid two-phase flow based on computational fluid dynamics has made great progress, but the simulation of elongated and flexible filamentous particles represented by shredded tobacco is mostly based on the assumption of spherical particles, ignoring the particle size The change of geometric structure characteristics greatly simplifies the fluidization motion state and mutual influence factors of the slender and flexible filamentous particles, and the spatial motion characteristics of the slender and flexible filamentous particles are also lost during the simulation process. The results cannot well characterize the complex motion characteristics of the slender and flexible filamentous particles and the lack of mass and heat transfer processes, which are far from the real shape of tobacco, and it is difficult to truly show the motion characteristics of tobacco

In this way, the accuracy of the simulation is greatly reduced in the process of numerical simulation.

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