NEW ARTICLE
Flow rate–pressure drop relations for shear-thinning fluids in deformable configurations: Theory and experiments
SungGyu Chun, Evgeniy Boyko, Ivan C. Christov, and Jie Feng
Phys. Rev. Fluids 9, 043302 (2024)The flow rate–pressure drop relations for laminar flow of Newtonian fluids in common geometries are well understood. However, a complete understanding of how the interplay between shear-thinning rheology and wall compliance sets the flow rate–pressure drop relation for a deformable configuration is still lacking. Here, we provide detailed quantitative comparisons between theory and experiments for the flow rate–pressure drop relation for Newtonian and shear-thinning fluids in two common deformable configurations: a rectangular channel and an axisymmetric tube. Such a comparison is of fundamental importance since it provides insight into the adequacy of the constitutive model used.
EDITORS' SUGGESTION
Robust microstructure of self-aligning particles in a simple shear flow
Neeraj S. Borker, Abraham D. Stroock, and Donald L. Koch
Phys. Rev. Fluids 9, 043301 (2024)A self-aligning particle (SAP) attains near perfect alignment with the fluid lamellae of a low Reynolds number simple shear flow without application of external torques in contrast with the continuous rotation exhibited by most rigid bodies including thin fibers and disks. We characterize the robustness of the flow alignment of SAPs to secondary perturbations such as flow disturbances, Brownian motion, inter-interparticle interactions, and the presence of a wall using dynamic simulations of ring-shaped SAP geometries. The robust flow alignment of SAPs provides an alternative route to access highly aligned microstructures that are inaccessible to suspensions of traditional particle geometries.
LETTER
Straight to zigzag transition of foam pseudo-Plateau borders on textured surfaces
Alexis Commereuc, Sandrine Mariot, Emmanuelle Rio, and François Boulogne
Phys. Rev. Fluids 9, L041601 (2024)The structure of liquid foams follows simple geometric rules formulated by Plateau 150 years ago. On smooth surfaces, the foam liquid channels, also called pseudo Plateau borders, are straight between vertices. We demonstrate experimentally that on rough surfaces and under some conditions that we establish, the bubble footprint exhibits a morphological transition. The footprint can adopt a zigzag shape between vertices. We rationalize the number of zigzag segments by a geometric distribution describing the observations made with the footprint perimeter and the mesh size of the asperities.
NEW ARTICLE
Flow induced by the rotation of two circular cylinders in a viscous fluid
E. Dormy and H. K. Moffatt
Phys. Rev. Fluids 9, 044102 (2024)Stokes flow driven by rotation of two parallel cylinders inside a cylinder of large radius is investigated, and the flow in this triply-connected domain is determined numerically, with particular focus on the narrow-gap situation, when the local behavior is well described by lubrication theory. The asymptotic situation for infinite is inferred (i) when the cylinder axes are unconstrained, and (ii) when they are held fixed. Contributions to the far-field are identified: a torquelet and a radial quadrupole in the counter- and co-rotating cases, respectively. In the former case, when the cylinders make contact (zero gap) a contact force acting on the cylinder pair is identified.
NEW ARTICLE
Sedimentation of a single soluble particle at low Reynolds and high Péclet numbers
Nan He et al.
Phys. Rev. Fluids 9, 044502 (2024)We report experiments on the dissolution of a single particle during its sedimentation in a quiescent aqueous solution in the regime of low Reynolds and high Péclet numbers. We use butyramide, a chemical which does not change the density of water when it dissolves. The particle shrinks at a rate independent of its initial radius, in agreement with the model that we derive assuming Stokes drag and a mass transfer rate given by Levich (1962). This model becomes quantitative when including two correction factors to account for the non-sphericity of the particle and for the inclusions of air bubbles inside the particle.
COLLECTION
2023 Invited Papers Collection
COLLECTION
Frenkiel Award for Fluid Mechanics
NEW ARTICLE
Direct comparison of density-driven convective mixing in a three-dimensional porous medium using experiments and simulation
Rebecca Liyanage, Xiaojing Fu, Ronny Pini, and Ruben Juanes
Phys. Rev. Fluids 9, 043802 (2024)
NEW ARTICLE
Extended spreading of saline droplets upon impact on a frosty surface
Hao Zeng, Feng Wang, and Chao Sun
Phys. Rev. Fluids 9, 044001 (2024)
NEW ARTICLE
Degrees of freedom and the dynamics of fully developed turbulence
Diego Donzis and Shilpa Sajeev
Phys. Rev. Fluids 9, 044605 (2024)
NEW ARTICLE
Electrocapillary, thermocapillary, and buoyancy convection driven flows in the Melcher-Taylor experimental setup
Alexander Yu. Gelfgat and Gerrit Maik Horstmann
Phys. Rev. Fluids 9, 044101 (2024)
EDITORS' SUGGESTION
Turbulence modulation by suspended finite-sized particles: Toward physics-based multiphase subgrid modeling
S. Balachandar, C. Peng, and L.-P. Wang
Phys. Rev. Fluids 9, 044304 (2024)
NEW ARTICLE
Particle hydrodynamics in acoustic fields: Unifying acoustophoresis with streaming
Xiaokang Zhang, Jake Minten, and Bhargav Rallabandi
Phys. Rev. Fluids 9, 044303 (2024)
NEW ARTICLE
Floquet stability analysis of pulsatile flow in toroidal pipes
J. Simon Kern, Valerio Lupi, and Dan S. Henningson
Phys. Rev. Fluids 9, 043906 (2024)
NEW ARTICLE
Internally heated and fully compressible convection: Flow morphology and scaling laws
Whitney T. Powers, Evan H. Anders, and Benjamin P. Brown
Phys. Rev. Fluids 9, 043501 (2024)
EDITORS' SUGGESTION
Lagrangian coherent structures control solute dispersion in heterogeneous poroelastic media
Junhong Wu, Daniel Lester, Michael G. Trefry, and Guy Metcalfe
Phys. Rev. Fluids 9, 044501 (2024)
NEW ARTICLE
Transient energy growth in channel flow with compliant walls
Frédéric Alizard, Benoît Pier, and Smail Lebbal
Phys. Rev. Fluids 9, 043905 (2024)
NEW ARTICLE
Effects of wall conductivities on magnetoconvection in a cube
Hai-Tao Zhu, Long Chen, and Ming-Jiu Ni
Phys. Rev. Fluids 9, 043701 (2024)
EDITORIAL
Editorial: Introduction to the 40th Annual Gallery of Fluid Motion (Indianapolis, IN, USA 2022)
November 16, 2023
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