The overall traffic of droplets in a network of microfluidic channels is strongly influenced by the liquid properties of the moving droplets. In particular, the effective hydrodynamic resistance of individual droplets plays a key role in their global behavior. We here propose two simple and low-cost experimental methods for measuring this parameter by analyzing the dynamics of a regular sequence of droplets injected into an "asymmetric loop" network. The choice of a droplet taking either route through the loop is influenced by the presence of previous droplets which modulate the hydrodynamic resistance of the branches they are sitting in. We propose to extract the effective resistance of a droplet from easily observable time series, namely from the choices the droplets make at junctions and from the inter-droplet distances. This becomes possible when utilizing a recently proposed theoretical model, based on a number of simplifying assumptions. We here present several sets of measurements of the hydrodynamic resistance of droplets, expressed in terms of a "resistance length". The aim is twofold, (1) to reveal its dependence on a number of parameters, such as the viscosity, the volume of droplets, their velocity as well as the spacing between them. At the same time (2), by using a standard measurement technique, we compare the limitations of the proposed methods. As an important result of this comparison we obtain the range of validity of the simplifying assumptions made in the theoretical model.
Dynamics of a droplet migration in oscillatory and pulsating microchannel flows and prediction and uncertainty quantification of its lateral equilibrium position using Multi Fidelity Gaussian processes
A numerical lift force analysis on the inertial migration of a deformable droplet in steady and oscillatory microchannel flows at different Capillary numbers and oscillation frequencies
Deformation and breakup of a ferrofluid compound droplet migrating in a microchannel under a magnetic field: A phase-field-based multiple-relaxation time lattice Boltzmann study
Quantifying the Biophysical Properties of Red Blood Cells in Gaucher Disease
Brown University（布朗大学）；Université Paris Saclay（巴黎萨克雷大学）；CNRS UMR 8000（法国国家科学研究中心第8000联合研究单位）；Institut de Chimie Physique（物理化学研究所）；Université Paris Cité（巴黎西岱大学）；INSERM（法国国家健康与医学研究院）；EFS（法国血液服务机构）；BIGR U1134（BIGR第1134联合研究单位）；Team BioTiGR（BioTiGR团队）；Initiatives IdEx Globule Rouge d’Excellence (InIdex GR-Ex)（卓越红细胞倡议（InIdex GR-Ex））；Team PAMS（PAMS团队）
