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arXiv 1105.4249cond-mat.softphysics.bio-ph
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非牛顿流体和牛顿流体在压力作用下在固体基质上的铺展

Spreading of Non-Newtonian and Newtonian Fluids on a Solid Substrate under Pressure

Moutushi Dutta Choudhury, Subrata Chandra, Soma Nag, Shantanu Das, Sujata Tarafdar

摘要:

强非牛顿流体,即淀粉的水凝胶,显示出粘弹性行为,当受到负载。我们研究了葛粉和马铃薯淀粉凝胶。当流体的液滴被夹在两个玻璃板之间并被压缩时,流体和板之间的接触面积以振荡的方式增加。这与牛顿流体不同,在牛顿流体中,面积在类似情况下单调增加。此外,外围发展出一种不稳定性,看起来类似于Saffman Taylor手指。这在压缩状态下通常不会出现。加载历史也被发现影响的方式蔓延。我们试图描述的非牛顿流体的性质,通过一个粘弹性模型,将广义微积分。这是示出再现定性的表面应变的振荡变化。

英文摘要:

Strongly non-Newtonian fluids namely, aqueous gels of starch, are shown to exhibit visco-elastic behavior, when subjected to a load. We study arrowroot and potato starch gels. When a droplet of the fluid is sandwiched between two glass plates and compressed, the area of contact between the fluid and plates increases in an oscillatory manner. This is unlike Newtonian fluids, where the area increases monotonically in a similar situation. The periphery moreover, develops an instability, which looks similar to Saffman Taylor fingers. This is not normally seen under compression. The loading history is also found to affect the manner of spreading. We attempt to describe the non-Newtonian nature of the fluid through a visco-elastic model incorporating generalized calculus. This is shown to reproduce qualitatively the oscillatory variation in the surface strain.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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