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1. Progress and challenges in suspension rheology

   https://doi.org/10.1007/s00397-023-01421-z  

   Morris, Jeffrey F. (November 2023, Rheologica Acta)

   Coussot, P. (Ed.)

   Developments in the last century, and especially in the last 50 years, have advanced understanding of suspension rheology greatly. Here, a limited review of suspension work over this period is presented, emphasizing advances over the last three decades in understanding of the particle pressure and strong shear thickening, which were motivated by crucial experimental observations, computational advances, and a critical review, all from the 1980s. This review serves as a preview to some outstanding challenges in suspension mechanics. This article considers primarily dispersions of spherical particles, which serve not only as a model material for understanding the rheology of more complex fluids of practical relevance, but also as a basic system for the study of nonequilibrium statistical physics. 

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2. Particulate suspension coating of capillary tubes

   https://doi.org/10.1039/D2SM01211A  

   Jeong, D.-H.; Xing, L.; Boutin, J.-B.; Sauret, A. (November 2022, Soft Matter)

   The displacement of a suspension of particles by an immiscible fluid in a capillary tube or in porous media is a canonical configuration that finds application in a large number of natural and industrial applications, including water purification, dispersion of colloids and microplastics, coating and functionalization of tubings. The influence of particles dispersed in the fluid on the interfacial dynamics and on the properties of the liquid film left behind remain poorly understood. Here, we study the deposition of a coating film on the walls of a capillary tube induced by the translation of a suspension plug pushed by air. We identify the different deposition regimes as a function of the translation speed of the plug, the particle size, and the volume fraction of the suspension. The thickness of the coating film is characterized, and we show that similarly to dip coating, three coating regimes are observed, liquid only, heterogeneous, and thick films. We also show that, at first order, the thickness of films thicker than the particle diameter can be predicted using the effective viscosity of the suspension. Nevertheless, we also report that for large particles and concentrated suspensions, a shear-induced migration mechanism leads to local variations in volume fraction and modifies the deposited film thickness and composition. 

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3. Surface Bubble Growth in Plasmonic Nanoparticle Suspension

   https://doi.org/10.1021/acsami.0c05448  

   Zhang, Qiushi; Neal, Robert Douglas; Huang, Dezhao; Neretina, Svetlana; Lee, Eungkyu; Luo, Tengfei (June 2020, ACS Applied Materials & Interfaces)
4. Particle segregation in falling polydisperse suspension droplets

   https://doi.org/10.1017/jfm.2015.111  

   Faletra, Melissa; Marshall, Jeffrey S.; Yang, Mengmeng; Li, Shuiqing (April 2015, Journal of Fluid Mechanics)

   The problem of a suspension droplet falling under gravity was examined for polydisperse droplets composed of a mixture of particles with different densities and sizes. The study was conducted using both simulations based on oseenlet particle interactions and laboratory experiments. The hydrodynamic interactions of the particles within the suspension droplet allow a polydisperse collection of particles to fall as a coherent droplet, even for cases where the difference in particle terminal velocity would cause them to separate quickly from each other in the absence of hydrodynamic interactions. However, a gradual segregation phenomenon is observed in which particles with lower terminal velocity preferentially leave the suspension droplet by entering into the droplet tail, whereas particles with higher terminal velocity remain for longer periods of time within the droplet. When computations and experiments are performed for bidisperse mixtures, a point is eventually reached where all of the lighter/smaller particles are ejected into the droplet tail and the droplet continues to fall with only the heavier/larger particles. 

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5. Topologically mixing suspension flows over shift spaces

   https://doi.org/10.3934/dcds.2025013  

   Day, Jason (January 2025, Discrete and Continuous Dynamical Systems)