Rotary atomization of Newtonian and viscoelastic liquids

Capillary thinning of elastic and viscoelastic threads: From elastocapillarity to phase separation

“…These results open the way to a better understanding of the correspondence between fluid-mechanical theories that operate in a Lagrangian frame of reference and elasticity theory that uses the Eulerian reference frame. In addition, the understanding and control of the surface instabilities can have important repercussions for both fiber spinning of regular polymers [4,5] and a wealth of instabilities observed for biopolymer systems similar to the one studied here [35,48].…”

“…In particular, the formation of viscoelastic filaments has attracted much attention. The obvious importance of viscoelastic filaments for fiber spinning [4,5] has become a benchmark problem for testing viscoelastic fluid mechanics [6][7][8][9][10][11][12]. When pushing a polymeric liquid out of a syringe, instead of breaking off at the orifice by a Rayleigh-Plateau instability to form a drop as a Newtonian fluid does [13,14], long and slender filaments form that are very long lived.…”

Fragmentation versus Cohesion

“…. The process was already visible in Plateau's experiments with olive oil (Plateau 1849) and it has been since then identified in related contexts involving viscous fluids (Brenner et al 1994;Wong et al 2004;Villermaux et al 2013), not to mention viscoelastic fluids where the phenomenon is the rule (Oliveira & McKinley 2005;Keshavarz et al 2020). The consequence of this scenario is the typically bimodal character of the drop size distribution (the small drops are called 'satellites'), which present two broad but well-separated peaks (see e.g.…”

Tunable Harmonic Flow Patterns in Microfluidic Systems through Simple Tube Oscillation

“…The simplicity, controllability, versatility, and biocompatibility of the newly described technology make it highly suitable for multiple applications. These include important applications in physics (e.g., studying complex fluids and soft materials [5][6][7] and generation of droplets [58,59] ), chemistry (e.g., synthesis of various molecules and compounds [11,12] ), and biology (e.g., manipulation of cells, [60,61] performing multistep assays, [13] diagnostics, [62] and developing organ-on-a-chip platforms [63] for studying the mechanobiology of cells [64,65] and the human circulatory system [17,19,66] ). Notably, both customized harmonic and disturbed flow patterns can be created and studied using the newly described technology.…”

“…Generation of disturbed flows enhances the exchange of mass, momentum, and heat in microfluidic systems benefiting a variety of applications in physics, chemistry, biology, materials sciences, and bioengineering. This includes studying mechanical and rheological properties of complex fluids and soft materials such as polymers, emulsions, colloids, liquid crystals, and their biological counterparts, [5][6][7][8][9][10] chemical synthesis of hazardous chemical compounds, pharmaceutical agents, and micro/nanomaterials, [11][12][13][14] and mimicking harmonic/disturbed flows occurring in the natural systems, such as the human circulatory system, where they may cause dysfunction or disease. [15][16][17][18][19] Passive and active mechanisms have been used to generate disturbed flow patterns in microfluidic systems.…”