Effect of gas permeation and consolidation stress evolution on powder flow properties in the gas pressurization process

IF 2.4 3区工程技术 Granular Matter Pub Date : 2023-03-30 DOI:10.1007/s10035-023-01315-0

Bing Luo, Xin Wang, Minghao You, Cai Liang, Daoyin Liu, Jiliang Ma, Xiaoping Chen

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引用次数: 1

Abstract

Gas permeation and consequent powder consolidation during gas pressurization process easily cause deterioration of powder flowability. The effects of pressurization rate and powder properties on gas permeation and powder consolidation were investigated to reveal the change mechanism of powder flow properties in a sealed silo. The permeation time and gas velocity within the powder were examined to acquire the gas permeation characteristics at different pressurization rates. The distribution and evolution laws of powder stress were explored during the gas pressurization process. The powder stress during gas pressurization was more than 100 times that without aeration. A formula was derived for calculating the powder stresses and the results were compared with experimental data to confirm the consolidation mechanism. Based on the evolution of consolidation stress, the variation of the powder flow properties at different pressurization rates was revealed. The tensile strength of the powder and its change law in the gas pressurization process were examined with an adhesion force model.

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气体加压过程中气体渗透和固结应力演化对粉末流动特性的影响

气体加压过程中气体的渗透和粉末的固结容易导致粉末流动性的恶化。为了揭示密闭筒仓内粉末流动特性的变化机理，研究了加压速率和粉末性能对气体渗透和粉末固结的影响。通过对粉末内部渗透时间和气体流速的测定，获得了不同增压速率下粉末内部气体渗透特性。探讨了气体加压过程中粉末应力的分布和演化规律。加压时粉末的应力是不充气时的100倍以上。推导了粉末应力计算公式，并与试验数据进行了对比，验证了粉末的固结机理。基于固结应力的演化，揭示了不同增压速率下粉末流动特性的变化规律。采用附着力模型研究了粉末的抗拉强度及其在气体加压过程中的变化规律。

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.