Abstract A novel method is proposed to evaluate the interparticle forces and particle-wall interactions based on the pressure drop measurements at incipient fluidization. In the first experiment, we used the liquid bridge force as the model interparticle force of the glass ballotini (53 μm–105 μm). The theoretical relationship between the model liquid bridge force and the liquid addition volume was successfully presented. In the second part of experiment, the interparticle forces and the particle-wall interaction of cornstarch powders in a Perspex cylinder are determined. While the particle-wall interaction shows a linear relationship with the apparent bed-wall contact area, the interparticle force follows a logarithm relation with the bed mass for the Warren-Spring-type cornstarch powders. The results were also compared to the cohesion values obtained by a conventional shear tester. The results conclude that our method serves as an economically and accurate alternative to conventional shear testers.

中文翻译：

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通过初始流化时的粉末床压降分析颗粒间力和颗粒壁相互作用

摘要 基于初始流化时的压降测量，提出了一种评估颗粒间力和颗粒-壁相互作用的新方法。在第一个实验中，我们使用液桥力作为玻璃巴洛蒂尼 (53 μm–105 μm) 的模型粒子间力。成功地提出了模型液桥力与液体添加量之间的理论关系。在实验的第二部分，确定了有机玻璃圆柱体中玉米淀粉粉末的颗粒间作用力和颗粒-壁相互作用。虽然颗粒-壁相互作用与表观床-壁接触面积呈线性关系，但对于 Warren-Spring 型玉米淀粉粉末，颗粒间力与床质量呈对数关系。结果还与通过传统剪切测试仪获得的内聚力值进行了比较。结果得出结论，我们的方法可作为传统剪切测试仪的经济且准确的替代方案。