Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J37: Rheology I |
Hide Abstracts |
Chair: William Schultz, University of Michigan Room: 203AB |
Sunday, November 19, 2023 4:35PM - 4:48PM |
J37.00001: From steady flow to rest: percolation and rigidity in flow cessation of jammed suspensions Logan S Bayer, Emanuela Del Gado, Vinutha H. A. Under flow, jammed particle suspensions behave like yield stress fluids and display a complex stress relaxation when the flow is stopped. We have studied their stress relaxation upon flow cessation through large-scale computer simulations of soft, repulsive, and poly-disperse particles. Using a Voronoi analysis of the local packing during the stress relaxation, we construct a set of polyhedra to identify which local packing structures underpin the evolution toward mechanical stability. In particular, the time evolution of icosahedrally shaped Voronoi cells can be directly correlated to the stress relaxation in the the model jammed suspension. A time correlation analysis of the polyhedra dynamics upon flow cessation yields information on the characteristic timescales of relaxation within the jammed suspension. With a cluster analysis, we investigate the percolation of different types of polyhedral regions throughout the jammed suspension. Finally, we link the number of regions which maintain their icosahedral packing throughout relaxation to the suspension's residual stress. |
Sunday, November 19, 2023 4:48PM - 5:01PM |
J37.00002: Multiphase Poro-Viscohyperelastic Modeling of Soft Biological Cells Antonis Marousis, Yannis Dimakopoulos, John Tsamopoulos Soft biological cells exhibit intricate mechanical properties that arise from their complex composition and structure. Understanding and accurately modelling the mechanical behaviour of living cells has become a subject of utmost importance for a wide range of biomedical applications, including drug delivery, tissue engineering and medical image analysis. In this study, we have developed a multicomponent FEM that incorporates the Membrane that encloses the Cytoplasm and the Nucleus, located in the interior. The cytoplasm of soft cells exhibits both elastic and viscoelastic mechanical properties because of their deformable solid matrix, formed by organelles, which interacts with the entrapped cytosolic liquid [1], [2]. Provided that, the cytoplasmic space is represented as a biphasic material incorporating an incompressible visco-hyperelastic solid network and a Newtonian incompressible fluid. The nucleus, on the other hand, apart from a nonlinear stress-strain relationship, exhibits also time-dependent phenomena. At last, the cell membrane is modelled as a thin stiff hyperelastic layer. The cell is subjected to uniaxial tensile tests under different loading conditions including elongation, compression and loading/unloading cycles. The predictions of our numerical simulations are able to capture the key mechanical features of soft biological cells, such as the nonlinear stress-strain behaviour and the time-dependent viscoelastic response. Then, we examine the influence of various mechanical and viscoelastic properties in the tensile dynamics of the cell through a comprehensive parametric analysis. [1] E. Moeendarbary et al., Nat. Mater., vol. 12, no. 3, pp. 253–261, 2013, doi: 10.1038/nmat3517. [2] K. Psaraki et al. Phys. Fluids, vol. 35, no. 2, p. 21902, 2023, doi: 10.1063/5.0136707. |
Sunday, November 19, 2023 5:01PM - 5:14PM |
J37.00003: Unpicking the SECRETs of kinematically mixed rheology with Shear Extension Combined Rheology Experimental Techniques Richard Hodgkinson This flash presentation and poster presents foundation study results and introduces a new four year experimental research project to expand our understanding of "kinematically mixed" rheological flows - those that contain simultaneous shear and extension. |
Sunday, November 19, 2023 5:14PM - 5:27PM |
J37.00004: Rheology of suspensions of h-BN nanoparticles in xantham gum Monica F Naccache, Yago C Soares, Ricardo E Andrade, Helio Ribeiro Several industries are applying efforts to develop smart fluids, and rheology is an important tool to be used. In the oil & gas industry, new oilfields are being identified in complex reservoir environments, with high pressure and high temperature conditions. The development of smart drilling fluids with better properties to comply with the environmental requirements in deeper offshore regions are needed to improve the drilling and completion operations of oil wells. This work aims to study the rheology of oxidized nanostructures of hexagonal boron nitride (h-BN-oxi) directly dispersed in a polymeric system composed of deionized water and xanthan gum (XG). The effect of h-BN concentration, temperature and pressure on the nanofluid rheology is analyzed. The viscoelastic properties of the suspensions are obtained using a rotational rheometer. The thermal properties are acquired by the Modified Transient Plane Source. Techniques such as Transmission Electronic Microscopy, Scanning Electron Microscopy, Raman Spectroscopy, X-ray Diffraction, X-ray Photoelectron Spectroscopy, Thermogravimetric Analysis, Dynamic Light Scattering, Fourier Transform Infrared and Zeta Potential characterized morphologically and structurally the h-BN-oxi nanosheets. The experimental results helped to investigate the particle-particle and particle-fluid interactions mechanisms in the nanofluid, and allowed to understanding their effects on the rheological and thermal properties of the nanofluids. |
Sunday, November 19, 2023 5:27PM - 5:40PM |
J37.00005: Hardening phenomenon in wormlike micellar solutions Rossana Pasquino, Ilaria Cusano, Nino Grizzuti Surfactant solutions containing Cetylpyridinium Chloride (CPyCl), a classical ionic surfactant, and Sodium Diclofenac (Diclo), a non-steroidal anti-inflammatory drug used as a binding salt1, were prepared in a wide range of concentrations. More specifically, solutions were made at different concentrations of CPyCl, i.e. 5.0, 16.7, 33.0, 100 and 200 mM, and various Diclo contents. Linear and nonlinear rheological experiments were performed at 25°C with a strain-controlled ARES rheometer (TA instruments, USA), using a 50 mm - 0.017rad cone-plate geometry. |
Sunday, November 19, 2023 5:40PM - 5:53PM |
J37.00006: Bayesian uncertainty quantification for the squeeze flow of soft matter Aricia Rinkens, Clemens V Verhoosel, Nick O Jaensson Soft matter have a microstructure due to which the constitutive behavior is dependent on its state (e.g., deformation or stress). The characterization of the flow is essential to optimize industrial processes such as additive manufacturing. Because of the increase in complexity of the flow settings and the materials, the calibration of the constitutive models can be a daunting task. |
Sunday, November 19, 2023 5:53PM - 6:06PM |
J37.00007: Smoothed-Particle Hydrodinamics simularions of viscoelastic integral fractional models Luca Santelli, Adolfo Vázquez-Quesada, Marco Ellero In order to capture specific characteristics of non-Newtonian fluids, during the past years fractional constitutive models have become increasingly popular. Indeed, these models are able to capture in a simple and compact way the complex behaviour of viscoelastic materials, such as the change in power-law relaxation pattern during the relaxation process of some materials [1]. |
Sunday, November 19, 2023 6:06PM - 6:19PM |
J37.00008: Oscillatory Extensional Rheometry William W Schultz, Subramaniam Balakrishna We continue to analyze a promising method to measure fluid parameters kinematically with oscillatory extensional rheometry. The axisymmetric free surface is optically determined and its shape is fit to linear theory to determine viscosity, surface tension and relaxation and retardation times. Now we time march the 1D nonlinear equations to determine the limits of linearity, challenges in reaching a steady limit cycle, symmetry and effect of perturbations. Our 1D Crank-Nicolson model is second-order in space and time and often requires very small time steps and sometimes backward differencing. We also extend our linear model by using multiple frequencies to obtain multiple relaxation times. |
Sunday, November 19, 2023 6:19PM - 6:32PM |
J37.00009: Investigating the degradation of the uniaxial rheology of polymers in the presence of dyes Marufa Akter Upoma, Ziwen He, Huy Tran, Min Y Pack Extensional rheology is an important factor to determine the polymer behavior in various applications. Dye and polymer are used together in many industrial applications such as in inkjet printing, and food additives. However, despite the numerous applications of dye-polymer interactions, how dye affects the extensional rheology of polymers is still unclear. In this study, we investigated the effect of cationic Methylene Blue (MB) dye and anionic Fluorescein (Fl) dye on the extensional rheology of polyethylene oxide (PEO), xanthan gum (XG), and Boger fluids (BF). The capillary thinning dynamics of the dye-polymer solution was observed by the Dripping onto Substrate (DOS) method. The experimental results showed that the Fl dye had no effect on the inertio-capillary regime of PEO. However, in the elasto-capillary regime, the addition of Fl dye accelerated the pinch-off dynamics of PEO, causing a 40% and 50% reduction in the extensional viscosity, ηE and relaxation time, λE. Although adding Fl dye decreased the ηE and λE of the PEO, it had minimal effects on the ηE and λE of XG and BF. On the other hand, ηE and λE of PEO-MB dye solution did not change significantly (i.e., 10-20% decrease). However, in the presence of MB dye, the λE of XG decreased by 50% - indicating strong molecular interactions of the dye-polymer pairs when they are oppositely charged. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700