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frictional behavior of a Micro-sized Superconducting Fiber in a Low-Temperature Medium： Experimental and Computational Analysis

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Acta Mechanica Solida Sinica 2018年第4期31卷 405-415页

作者： Shiren La Jun Wang Xingyi Zhang Youhe Zhou Department of Mechanics and Engineering Sciences College of Civil Engineering and Mechanics Lanzhou University Lanzhou 730000 China Key Laboratory of Mechanics on Disaster and Environment in Western China Attached to the Ministry of Education of China Lanzhou University Lanzhou 730000 China

The purpose of the current study is to explore the frictional behavior of a micro- sized superconducting fiber at the low-temperature condition. At first, a highly precise tribometer composed of a superconducting fiber wrapping around a cylinder made of pure Cu was immersed in liquid nitrogen. The force and displacement resolutions of the experimental system were as high as 0.01 mN and 0.03 ~m, respectively. The NbTi fibers with diameters ranging from 22.9 to 115 ~m were used in the experiments, and their frictional behaviors in three media, i.e., liquid nitrogen, air and water, were systemically investigated. It was found that the frictional force in air showed a remarkable size effect. The existence of water medium could significantly reduce the frictional force, but could not eliminate the size effect. For the samples with the same diameter, the frictional force in liquid nitrogen was about 1.4 times of that in air, accompanied with remark- able stick-slip phenomenon. Notably, the fiber＇s frictional behavior in liquid nitrogen showed no dependence on diameter. In order to interpret these phenomena, the frictional behaviors of the fibers in air, water and liquid nitrogen were simulated using a modified spring-slider model, by taking into account the influence of hydrophilicity on surface roughness, and the influence of surface roughness on the fiber＇s frictional behavior. The simulation results were consistent with the experimental data qualitatively.

关键词： Micro-sized superconducting fiber frictional behavior Surface roughness Hydrophilic-ity Stick-slip Size effect Modified spring-slider model

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The effect of hemicellulose on the interparticle frictional behavior of lignocellulosic biomass particulates

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Particuology 2021年第2期19卷 16-22页

作者： Ekramul Haque Ehite Eric Drumm Nourredine Abdoulmoumine Biosystems Engineering and Soil Science Department University of TennesseeKnoxvilleTN 37996USA Center for Renewable Carbon University of TennesseeKnoxvilleTN 37996USA

Lignocellulosic biomass material sourced from plants and herbaceous sources is considered as a prospective feedstock of inexpensive,potentially carbon-neutral *** biomass is structurally built on cellulose,hemicellulose,and lignin,which are present in varying concentrations based on the feedstock type and play distinct and not well understood mechanical functions in the flow *** frictional characteristics of lignocellulosic biomass particulates influence their flow behavior in ***,it is important to fundamentally investigate the relative contribution of cellulose,hemicellulose,and lignin to the frictional ***,these three biopolymers are interwoven into a complex matrix in the lignocellulosic biomass,thus making it hard to quantify the contribution of each *** this study,we selectively remove hemicellulose from switchgrass and investigate the effects of its diminishing concentration on the coefficient of *** observed that the angle of repose and,therefore,the coefficient of friction for a loose assembly of the control and treated switchgrass samples decrease with decreasing hemicellulose *** indicates the frictional resistance to flow for biomass particulate assemblies is at least proportional to the hemicellulose *** also established that the observed changes in the frictional behavior were not due to particle morphological characteristics.

关键词： Lignocellulosic biomass frictional behavior Angle of repose Hot water extraction Switchgrass Hemicellulose removal

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