Publicado 12 números por año
ISSN Imprimir: 1091-028X
ISSN En Línea: 1934-0508
Indexed in
Dynamic Compaction of Soft Compressible Porous Materials: Experiments on Air-Solid Phase Interaction
SINOPSIS
An experiment has been designed to examine the generation of dynamic lift forces during compaction of soft highly compressible fibrous materials in a piston/cylinder apparatus. Novel experimental techniques have been developed to simultaneously measure and separate out the dynamic forces acting on the compressing piston by the air and solid phases, respectively. The measurements clearly demonstrate that the excess pore pressure builds up inside the porous material and reaches its maximum before there is any significant rise in the solid-phase force. The air pressure subsequently decays due to air venting into the ambient environment at the edges of the testing apparatus as the solid phase force rapidly rises. We also examine the internal stresses and strains within the solid phase that develop as a result of friction forces along the sidewalls of the cylinder and show that these lead to important hysteresis effects when the loads on the piston are gradually removed. The experiments are performed on a polyester material with a trace of silk, which has recently been proposed for a soft porous track wherein a high-speed train is supported by a large planing surface or ski that rides within a confined channel in which this venting is substantially reduced or eliminated (Mirbod et al, 2009).
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Crawford Robert, Jones Gerard F., You Lidan, Wu Qianhong, Compression-dependent permeability measurement for random soft porous media and its implications to lift generation, Chemical Engineering Science, 66, 3, 2011. Crossref
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Akaydin H.D., Pierides A., Weinbaum S., Andreopoulos Y., Permeability of soft porous media under one-dimensional compaction, Chemical Engineering Science, 66, 1, 2011. Crossref
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Crawford Robert, Nathan Rungun, Wang Liyun, Wu Qianhong, Experimental study on the lift generation inside a random synthetic porous layer under rapid compaction, Experimental Thermal and Fluid Science, 36, 2012. Crossref
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Popescu Cristian S., Dynamic permeability of highly compressible porous layers under squeeze at constant velocity and under impact, Tribology International, 44, 3, 2011. Crossref
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Ling Bowen, Tartakovsky Alexandre M., Battiato Ilenia, Dispersion controlled by permeable surfaces: surface properties and scaling, Journal of Fluid Mechanics, 801, 2016. Crossref
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Wu Qianhong, Santhanam Sridhar, Nathan Rungun, Wang Qiuyun, A biphasic approach for the study of lift generation in soft porous media, Physics of Fluids, 29, 4, 2017. Crossref
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Gacka T., Zhu Z., Crawford R., Nathan R., Wu Q., From red cells to soft lubrication, an experimental study of lift generation inside a compressible porous layer, Journal of Fluid Mechanics, 818, 2017. Crossref
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Zhu Zenghao, Wang Qiuyun, Wu Qianhong, On the examination of the Darcy permeability of soft fibrous porous media; new correlations, Chemical Engineering Science, 173, 2017. Crossref
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Mirbod Parisa, Wu Zhenxing, Ahmadi Goodarz, Laminar flow drag reduction on soft porous media, Scientific Reports, 7, 1, 2017. Crossref
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Wu Zhenxing, Mirbod Parisa, Experimental analysis of the flow near the boundary of random porous media, Physics of Fluids, 30, 4, 2018. Crossref
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Zhu Zenghao, Weinbaum Sheldon, Wu Qianhong, Experimental study of soft porous lubrication, Physical Review Fluids, 4, 2, 2019. Crossref