Cohesive Powder Flow: Trends and Challenges in Characterisation and Analysis

IF 2.6 4区 材料科学 Q3 ENGINEERING, CHEMICAL KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI:10.14356/kona.2020018
M. Ghadiri, M. Pasha, Wenguang Nan, C. Hare, Vivacqua, U. Zafar, S. Nezamabadi, A. López, S. Nadimi
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引用次数: 38

Abstract

Powder processing and manufacturing operations are rate processes for which the bottleneck is cohesive powder flow. Diversity of material properties, particulate form, and sensitivity to environmental conditions, such as humidity and tribo-electric charging, make its prediction very challenging. However, this is highly desirable particularly when addressing a powder material for which only a small quantity is available. Furthermore, in a number of applications powder flow testing at low stress levels is highly desirable. Characterisation of bulk powder failure for flow initiation (quasi-static) is well established. However, bulk flow parameters are all sensitive to strain rate with which the powder is sheared, but in contrast to quasi-static test methods, there is no shear cell for characterisation of the bulk parameters in the dynamic regime. There are only a handful of instruments available for powder rheometry, in which the bulk resistance to motion can be quantified as a function of the shear strain rate, but the challenge is relating the bulk behaviour to the physical and mechanical properties of constituting particles. A critique of the current state of the art in characterisation and analysis of cohesive powder flow is presented, addressing the effects of cohesion, strain rate, fluid medium drag and particle shape.
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粘性粉末流动:特征和分析的趋势和挑战
粉末加工和制造操作是速度过程,其瓶颈是粘性粉末流动。材料特性、颗粒形式的多样性以及对环境条件(如湿度和摩擦充电)的敏感性使其预测非常具有挑战性。然而,这是非常理想的,特别是当处理只有少量可用的粉末材料时。此外,在许多应用中,在低应力水平下进行粉末流动测试是非常可取的。散装粉末流动起爆(准静态)失效的表征已经很好地建立起来。然而,体流参数都对剪切粉末的应变速率敏感,但与准静态测试方法相反,在动态状态下,没有剪切单元来表征体流参数。只有少数几种仪器可用于粉末流变学,其中运动的体积阻力可以量化为剪切应变率的函数,但挑战是将体积行为与构成颗粒的物理和机械性能联系起来。本文提出了对粘性粉末流动的表征和分析的当前状态的批评,解决了粘性、应变速率、流体介质阻力和颗粒形状的影响。
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来源期刊
KONA Powder and Particle Journal
KONA Powder and Particle Journal 工程技术-材料科学:综合
CiteScore
8.40
自引率
4.90%
发文量
35
审稿时长
>12 weeks
期刊介绍: KONA publishes papers in the broad field of powder science and technology, ranging from fundamental principles to practical applications. Papers describing technological experience and critical reviews of existing knowledge in special areas are also welcome.
期刊最新文献
Editor’s Preface The 54th Symposium on Powder Technology and Special Lecture for the 30th Anniversary of the Establishment of HPTF The KONA Award 2021 General Information Effects of DEM Parameters and Operating Conditions on Particle Dynamics in a Laboratory Scale Rotating Disc
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