From breakup to coiling and buckling regimes in buoyant viscoplastic injections

S Akbari, SM Taghavi - Journal of Fluid Mechanics, 2022 - cambridge.org
We study the injection flow of a heavy viscoplastic fluid into a light Newtonian fluid, via
modelling and experiments. The injection is carried out downward, via an eccentric inner …

Soft glassy materials with tunable extensibility

S Sen, RR Fernandes, RH Ewoldt - Soft Matter, 2024 - pubs.rsc.org
Extensibility is beyond the paradigm of classical soft glassy materials, and more broadly,
yield-stress fluids. Recently, model yield-stress fluids with significant extensibility have been …

Immersed buoyant viscoplastic injections

S Akbari, SM Taghavi - Journal of Non-Newtonian Fluid Mechanics, 2022 - Elsevier
In this study, the injection of a viscoplastic (yield stress) fluid into a quiescent Newtonian
medium is experimentally investigated, using a range of experimental methods, including …

Rheology and dispensing of real and vegan mayo: the chickpea or egg problem

NN Nikolova, CDVM Narváez, L Hassan, RA Nicholson… - Soft Matter, 2023 - pubs.rsc.org
The rheology, stability, texture, and taste of mayonnaise, a dense oil-in-water (O/W)
emulsion, are determined by interfacially active egg lipids and proteins. Often mayonnaise is …

Extensional gravity-rheometry (EGR) for yield stress fluids

A Geffrault, H Bessaies-Bey, N Roussel… - Journal of Rheology, 2021 - pubs.aip.org
In order to measure the extensional rheological properties of yield stress fluids, we
developed a rheometrical approach based on the analysis of the deformations of a fluid …

Investigation of the extensional properties of elasto-visco-plastic materials in cross-slot geometries

A Kordalis, S Varchanis, G Ioannou… - Journal of Non …, 2021 - Elsevier
The generation of a wide region of shear-free, strong extensional flow near a stagnation
point has been proven to be a great challenge, especially when considering yield-stress …

Droplet formation of yield stress fluids in asymmetric parallelized microchannels

X Xiang, Z Wang, Y Dong, C Zhu, T Feng, Y Ma… - Chemical Engineering …, 2024 - Elsevier
The microemulsion method is limited due to low productivity. Using Carbopol gel (0.05%,
0.13%, 0.2%) and mineral oil as dispersed phase and continuous phase respectively (3≤ Q …

Dynamics of elastoviscoplastic filament stretching

P Moschopoulos, E Kouni, K Psaraki, Y Dimakopoulos… - Soft Matter, 2023 - pubs.rsc.org
We study theoretically the stretching dynamics of a yield stress material that exhibits both
elastic and viscoplastic behavior. The material is confined between two coaxial disks …

An improved capillary breakup extensional rheometer to characterize weakly rate-thickening fluids: Applications in synthetic automotive oils

J Du, H Ohtani, CE Owens, L Zhang, K Ellwood… - Journal of Non …, 2021 - Elsevier
We describe a customized Capillary Breakup Extensional Rheometer (CaBER) with
improved dynamic performance and added features for temperature control over the range …

Computational modeling and experiments of an elastoviscoplastic fluid in a thin mold-filling geometry

J McConnell, W Ortiz, JC Sutherland, P Newell… - Journal of Non …, 2022 - Elsevier
Materials which exhibit elastic and yielding behavior are present in many industrial
processes including thin-film coating, oil extraction, manufacturing of consumer products …