脉动剪切中的压力位移：一种探测复合流体正应力响应的微流体方法
摘要
presented a microfluidic approach to probing the first normal stress difference from single-point pressure measurements in transient shear flows. Using an original experimental design, we examine the near-zero-mean pulsatile flow of polymeric solutions in a straight microchannel at low Reynolds and Womersley numbers. An important aspect of this work is that the enhanced fluid elastic stresses can be efficiently determined via the pressure shift measured from pressure-controlled pulsatile shear experiments. We find a scaling law that collapses pressure-shift data from viscoelastic fluids of different molecular weights onto a single master curve that can then be used to predict this phenomenology. Taken together, these results could help shed light on our understanding of the non-linear normal stress responses in time-dependent flows.
引用
@article{arxiv.2509.20248,
title = {Pressure shifts in pulsatile shear: A microfluidic method to probe the normal stress response of complex fluids},
author = {T. Rodrigues and F. J. Galindo-Rosales and L. Campo-Deaño},
journal= {arXiv preprint arXiv:2509.20248},
year = {2026}
}
备注
Final pre-publication version