Bulletin of the American Physical Society
75th Annual Meeting of the Division of Fluid Dynamics
Volume 67, Number 19
Sunday–Tuesday, November 20–22, 2022; Indiana Convention Center, Indianapolis, Indiana.
Session U23: Porous Media Flows: Application |
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Chair: Jian Sheng, Texas A&M Univ.–Corpus Christi Room: 231 |
Tuesday, November 22, 2022 8:00AM - 8:13AM |
U23.00001: On Pore-size Graded Membrane Networks Binan Gu, Lou Kondic, Linda J Cummings Pore-size gradients are often used in the design of membrane filters to increase filter lifetime and ensure fuller use of the initial membrane void volume. In this work, we model pore-size gradients in the setting of a membrane filter with an internal network of interconnected pores, and study the influence on membrane performance measures such as total filtrate throughput and accumulated contaminant concentration at the membrane downstream pore outlets. Within the limitations of our modeling assumptions we find that there is an optimal pore-radius gradient that maximizes filter efficiency independent of maximal pore length (an input parameter that influences membrane geometry), and that membrane pore networks with longer characteristic pore length perform better. |
Tuesday, November 22, 2022 8:13AM - 8:26AM |
U23.00002: Microfluidic study and modeling of end-point permeability of multiphase flow Shaken Kenzhekhanov, Xiaolong Yin, Iskander Gussenov At the endpoint of a multiphase flow in a porous medium, only a single phase is flowing and the other phases are stationary. The permeability of the medium to the flowing phase, the end-point permeability, sometimes is extremely low, despite that the flowing phase may still have an appreciable saturation. As an example, we note that flowing water or oil through porous media that have been previously infilled with polymer solution can be very difficult. In this study, we used microfluidics porous media micromodels to visualize the distribution of fluids at the endpoints of multiphase flows. These micromodels have close-to-real-rock pore dimensions and porosities. We found that the end-point relative permeability of water/oil after polymer flow was disproportionally low because these fluids must flow through highly tortuous pathways. A mathematical model was developed to describe the correlation between the pore-scale fluid distribution function and the end-point relative permeability; it can successfully predict the end-point relative permeability of all studied flows. |
Tuesday, November 22, 2022 8:26AM - 8:39AM |
U23.00003: Multi-stage filtration with feed containing multiple species of particles. YIXUAN SUN, Lou Kondic, Linda J Cummings Membrane filtration of feed containing multiple species of particles is a common process in the industrial setting. In this work we propose a model for filtration of a suspension containing multiple particle species (concrete examples of our model are shown in two and three species), each with different affinities for the material of the porous filter membrane. Using the pore shape within the membrane as a design objective, we formulate a number of optimization problems pertaining to effective separation of desired and undesired particles in the special case of two particle species and we present results showing how properties such as feed composition affect the optimal filter design. In addition, we propose a novel multi-stage filtration strategy, which provides a significant mass yield improvement for the desired particles, and, surprisingly, higher purity of the product as well. |
Tuesday, November 22, 2022 8:39AM - 8:52AM |
U23.00004: Vortical cleaning of oil-impregnated porous surfaces siddhant Jain, Shubham Sharma, Durbar Roy, Saptarshi Basu Vortex rings are found in many natural and industrial processes. The most fascinating thing about vortex rings are their self-propelling and sustaining feature that distinguishes it from fluid jets. Here, we work towards a novel idea of vortical cleaning where vortex rings of various strengths are utilized to clean oil-laden porous surfaces. Although there exist few literatures on the interaction of vortex rings with porous surfaces, to the best of authors' knowledge, no study has investigated the vortex interaction with an oil impregnated porous surface. We explore the physics behind the interaction process by changing the Reynolds number of the vortex ring till the turbulent regime using high-speed shadowgraphy images, Planar Laser-Induced Fluorescence (PLIF) and Particle Image Velocimetry (PIV) techniques. The interaction reveals interesting insights which have been discussed under three regimes: 1) Penetration, 2) Bag formation, and 3) Bag breakup. The interaction results in the formation of droplets via Rayleigh-Taylor and Rayleigh-Plateau type instabilities. Moreover, due to the rotational nature of the vortex ring, oil is taken out from both the sides of the porous surface. Although, vortex rings with higher strength are able to expunge more oil, the physics depends much on the shape of the porous surface. The present method can be applied to clean various porous surfaces, including industrial filters and surgical masks |
Tuesday, November 22, 2022 8:52AM - 9:05AM |
U23.00005: Traveling Viscosity Waves and Mild Viscous Fingering : the Unexpected Role of Shear Thinning Revealed by Data Driven Modeling of Shear-Thinning Polymer Flooding Prabir Daripa Modeling multiphase multicomponent immiscible porous media flows is a challenging task due to the interaction of interfaces and multiple simple and complex fluids of varying properties. We have developed a framework for incorporating shear thinning effects of polymer in a surfactant-polymer flooding simulator developed by Daripa and Dutta. The model, although is based on a very basic power law model, is data driven and implements the values of power-law coefficients empirically guided by the local values of concentration and shear rate. Since the concentration and shear rates are spatio-temporal variables, this model can predict physically accurate variable viscosity in the flow field based on local parameters. We demonstrate the importance of such a data-driven model and the potential it holds for improved modeling of polymer flooding to make an informed decision while choosing a polymer for a given flood simulation. Simulation reveals unexpected role of data driven shear thinning effect such as traveling viscosity waves and very mild viscous fingering, Participation of Rohit Mishra in simulating flows during early stages of this project is gratefully acknowledged. |
Tuesday, November 22, 2022 9:05AM - 9:18AM |
U23.00006: Passive Control of Non-Canonical Flows with Anisotropic Porous Materials Sasindu N Pinto, Louis N Cattafesta, YANG ZHANG, Charles Meneveau, Rajat Mittal, Jung-Hee Seo, Mostafa Aghaeijouybari We examine the characteristics of flow through high-porosity anisotropic porous material (APM) lattices. In particular, we analyze periodic cubic lattice samples with isotropic and anisotropic projected area porosities along the principal axes of the sample. A 1-inch cube sample fabricated using stereolithography is installed at the end of a long square duct that can produce fully developed laminar flow up to Re=2000, based on the hydraulic diameter and bulk velocity of the duct. The Darcy-Forchheimer model is used for data analysis with consideration to nonlinear inertial effects at high Re. Pressure drop data for isotropic specimens are first measured to verify the repeatability of the experiments. Data are then acquired and analyzed for various designs with high (~0.85), medium (~0.50) and low (~0.15) projected area porosities and compared with select Direct Numerical Simulations (DNS). The data are used to determine scaling laws that may be useful for APM designs in future flow control applications. |
Tuesday, November 22, 2022 9:18AM - 9:31AM |
U23.00007: Fluid mediated assembly of pixelated materials Christopher M Ushay, Mohamed Badaoui, Grace V Kresge, Joel Marthelot, Pierre-Thomas Brun Capillary imbibition plays a critical role in a number of natural and engineering systems, from drinking strategies and plant vasculature to transport in porous media and emulsion generation. Here we fabricate novel soft materials by harnessing this phenomenon to draw curing elastomers through confined geometries. We first rationalize the fluid mechanics at play: as a pressure gradient drives flow from an inlet into a Hele-Shaw cell, we predict the dynamics and final state of the system as a function of interfacial tension, viscous effects, and curing properties of the chosen material. When inlets are close enough for their respective flows to interact, we observe the formation of connected networks, including angular structures such as polyhedra. We then explore the inverse case in which we determine the inlet configuration necessary to achieve a desired pattern. Extending this methodology to different types of materials opens the door for the fabrication of architected soft sheets, whose structure can provide superior properties and functionality. |
Tuesday, November 22, 2022 9:31AM - 9:44AM |
U23.00008: Skin Tissue Deformation and Permeability related to Pressure Driven Flow Mary-Jo W Weir Weiss, Boris Stoeber Skin tissue is a porous, permeable, fluid filled, and deformable media. However, currently there is limited understanding of the characteristics of fluid flow through skin tissue. There are several motivations for gaining a better understanding of how fluid flows through skin tissue. The fundamental knowledge of how fluid flows through skin tissue can be useful to improve intradermal injection technologies, to provide a reference for comparison when designing artificial skin grafts, and for future skin tissue related biomedical applications and inventions. |
Tuesday, November 22, 2022 9:44AM - 9:57AM |
U23.00009: Effect of porous structures in zeolite/geopolymer composites on flow fields using GPU accelerated volumetric lattice Boltzmann method Xiaoyu Zhang, Yulan Li, Floyd Hilty, Proust Vanessa, Agnes Grandjean, Robert Montgomery, Hanno Z Loye, Huidan Yu, Shenyang Hu Nuclear waste containing radionuclei such as cesium (Cs) and strontium (Sr) isotopes are hazardous to the environment. Composites with porous structures are usually used to immobilize Cs/Sr by uptake from radioactive effluent streams. For the development of nuclear waste materials devoted to Cs/Sr absorption, it is important to understand the effect of porous structures in composites on flow fields. In this work, we used volumetric lattice Boltzmann method (VLBM) to solve complex flow in porous structures. A MATLAB code was developed to reconstruct 3-D porous structures from images generated by scanning electron microscope. GPU parallel computing is combined with VLBM to get higher computational efficiency. Validation of this method against the analytical solutions in a 3-D straight pipe and numerical solutions for a simple porous structure using a finite element software capability developed from the Idaho National Laboratory's Multiphysics Object-Oriented Simulation Environment shows good agreement. By comparing the flow in pure geopolymers and zeolite/geopolymer composites, it is expected to glean insights into the effect of porous structures on flow fields which could enhance the development of advanced nuclear waste form materials with better Cs/Sr absorption performance. |
Tuesday, November 22, 2022 9:57AM - 10:10AM |
U23.00010: Polymer flows over substrate with an array of high aspect-ratio microwells (µWells) Jian Sheng, Maryam Jalali, Kok Suen Cheng Shear-stress and pressure measurement carry significant interest for various wall flows. However, obtaining both stresses simultaneously with adequate resolutions remains a challenge. Here, we propose wall stress measurement technique by creating arrays of µWells embedded with deformable mirrors and a digital holographic microscopic interferometry. We have developed a method to successfully fabricate a wrinkle free thin film mirror over a soft substrate by suppressing instability with a nm-layer of nanoparticles. Fabrication of thin film embedded in µWells requires flow highly viscous polymer into high aspect ratio µWells (e.g., depth of ~200 mm and diameter of 50-500mm) To understand the polymer flows in confinement, we use SU-8 µWell array fabricated by photolithography and a mixture of polydimethylsiloxane (PDMS) and hexane as model polymer system. By varying PDMS in hexane, we can tune the viscosity and surface tension of the mixture. Measurements will be performed to examine the flow in the µWells experimentally. Scaling of polymeric flow on Re and We will be established and validated via numerical simulations |
Tuesday, November 22, 2022 10:10AM - 10:23AM Author not Attending |
U23.00011: Can local salt gradients at microscale impact the macroscopic transport of colloids in a porous medium? Mamta Jotkar, Pietro de Anna, Luis Cueto-Felgueroso Flows containing dissolved salts and suspended particles in a porous medium can occur in a variety of natural and engineered scenarios where local salt gradients can induce particle motion via a phenomenon known as diffusiophoresis [1,2]. Although this contributes to the complexity of the overall transport problem, it can be exploited for a variety of technological applications [3-6]. Aiming to unravel the coupling of the underlying physical mechanisms, we conduct pore-scale simulations to investigate the fluid, solute and particle transport in a micromodel. We measure the time-lapsed effluent concentration of the colloidal particles close to the outlet and compute the so-called breakthrough curves to understand the influence of diffusiophoresis on the particle macroscopic transport through the whole host medium. Our results hint towards the fact that the microscopic interplay between diffusiophoretic particle motion and host medium disorder can impact the macroscale particle dynamics. Lastly, while both, the flow and transport through a porous medium and the diffusiophoretic motion of colloids in a variety of microfluidic devices, are active areas of research, the novelty of our work lies in the intersection of the two. |
Tuesday, November 22, 2022 10:23AM - 10:36AM |
U23.00012: Decontamination of porous surfaces Francesco Paolo Conto, Emily Butler, Merlin A Etzold, Julien R Landel, Stuart B Dalziel The decontamination of materials is a challenging problem in a wide range of industrial, medical, urban and disaster-response applications. Attempts to decontaminate porous surfaces (e.g. concrete, tarmac and wood) can lead to a partial redistribution of the contaminant within the porous medium rather than a complete removal. This is of crucial importance in case of extremely harmful agents. |
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