Bulletin of the American Physical Society
72nd Annual Meeting of the APS Division of Fluid Dynamics
Volume 64, Number 13
Saturday–Tuesday, November 23–26, 2019; Seattle, Washington
Session L38: Porous Media Flow General II |
Hide Abstracts |
Chair: Prabir Daripa, Texas A&M University Room: 620 |
Monday, November 25, 2019 1:45PM - 1:58PM |
L38.00001: Microscale heterogeneous pore occupancy with variable background pressure gradient Oliver McRae, T.S. Ramakrishnan, James Bird Fluid flow through small length scale networks---porous rock, or tumor vasculature---is typically governed by a pressure driven flow dominated by viscous resistance. In the displacement of an immiscible nonwetting fluid, in addition to an external pressure, an internal capillary pressure at the interface of the fluids causes spontaneous movement of the fluid interface. This creates two characteristic regimes: one dominated by capillarity (imbibition), and one dominated by viscosity (drainage). However, the role of the background pressure gradient and heterogeneity on microscale displacement dynamics, and subsequent pore occupancy is unclear. Here we show that the interaction between two parallel pores and a common node with a background resistance is the simplest system to exhibit two distinct imbibition regimes. With this pore doublet model and numerical simulations, we uncover a crossover in pore occupancy as a function of channel size ratio and outlet resistance, and remarkably obtain the same relationship between capillary number and the global residual fluid saturation previously observed in sandstone cores. [Preview Abstract] |
Monday, November 25, 2019 1:58PM - 2:11PM |
L38.00002: Study of Flow Over and Through the Porous Bed: Experimental and Numerical Study Narendra Kumar Patel, Junke Guo, David Admiraal Guo et al.(2016) suggested velocity profile in vegetated flows. Objectives of this research are to extend the velocity profile suggested by Guo et al.(2016) to generate velocity profile over and through the porous gravel bed, and suggest values for the fitting parameters in equations. Navier-Stokes-Forchheimer equation for flow within the bed and Navier-Stokes equation for flow above the bed are solved simultaneously to generate unified velocity profile. Experimentally, dye was injected in the gravel bed at different depths and its peak concentration was observed at multiple locations at downstream side. A fiber optics based sensor was developed and time for peak concentration at different locations was identified by LabVIEW to generate velocity profile in bed. An ADV is used to measure flow velocity above the bed. V-notch is used to measure total flow at the end of flume. Numerically, Fluent software is used to simulate combine flow field in and above the porous bed. Our preliminary experimental data well matched with numerical results and help us to find values of fitting parameters in theoretical equations. Reference: Junke, Guo; Jianmin Zhang (2016) Velocity distributions in laminar and turbulent vegetated flows. J. of hydraulic research, volume 54, issue 2, pp 117-130. [Preview Abstract] |
Monday, November 25, 2019 2:11PM - 2:24PM |
L38.00003: Gravity-driven sliding motion on soft porous layer. Rungun Nathan, Zenghao Zhu, Qianhong Wu Soft porous lubrication is a new concept in porous media flow. In this paper, we report a novel experimental study to investigate the gravity-driven sliding motion of a planar board over a tilted soft porous layer. A laser displacement sensor was used to measure the motion of the board, while a high-speed camera was adopted to capture the detailed compression of the porous layer when the board glided over it. The pore pressure generation, as a result of the compression, was recorded by pressure sensors mounted on the bottom surface of the porous layer. One finds that, the pressure distribution agrees well with theory developed by Wu {\&} Sun (Wu Q. {\&} Sun Q., \textit{Med. Sci. Sport. Exerc.} 2011, 43:1955--63). Extensive parametric study was performed by varying the center of gravity of the planar board, the tilted angle and the porous material. Consistent agreement between the theory and experimental results was obtained. It shows that, the effect of soft porous lubrication is enhanced when the center of gravity moves toward to the trailing edge of the planar board, or the slope of the porous layer is increased, or smoother fibrous surface is used. [Preview Abstract] |
Monday, November 25, 2019 2:24PM - 2:37PM |
L38.00004: Experimental study on the phase behavior of fluids confined in nanoporous media Xingdong Qiu, Sugata P. Tan, Morteza Dejam, Hertanto Adidharma Phase behavior of fluids in nanoporous media is of great significance in science and engineering applications and has direct and crucial implications in disciplines like drug delivery, supercritical extraction, CO$_{\mathrm{2}}$ sequestration, and hydrocarbon production and recovery enhancement from unconventional reservoirs, $e.g.$, tight shale formations. It has been well-known that confinement can play an essential role on the abnormal physical behavior of nano-scaled fluids, compared to their counterparts in bulk space. Recently, we developed a new isochoric method using a high-pressure Differential Scanning Calorimeter (DSC) to measure the phase transition of both pure substances and mixtures confined in nanoporous media (SBA-15 matrices with different pore diameters), which turns out to be quite straightforward and reliable. Particularly, this method allows us to achieve detailed insights with regard to the criticality of confined fluids as well as the heat involved during capillary condensation, both of which have hardly or even never been experimentally explored, especially with confined mixtures. The results demonstrate that confinement can shift the critical point of fluid and have an appreciable effect on the heat released during phase transition. [Preview Abstract] |
Monday, November 25, 2019 2:37PM - 2:50PM |
L38.00005: A study of the effect of shear thinning in EOR by surfactant-polymer Flooding prabir daripa, Rohit Mishra We have developed an in-house robust hybrid method for multi-component multi-phase flow in porous media arising in the context of enhanced oil recovery. This hybrid method is based on modified method of characteristics and discontinuous finite element method. We use this method to study the effects of a mixing model and effect of shear thinning on the fingering in enhanced oil recovery by surfactant-polymer flooding. This is an ongoing project and results of our study will be presented. [Preview Abstract] |
Monday, November 25, 2019 2:50PM - 3:03PM |
L38.00006: Optimization study of porous wind fence on reducing and stabilizing fluctuating pressure in the wake region Xingzhou Zhou, HeeChang Lim The sheltering effect of the porous wind fence on wind flow has been highlighted last several decades, which provides a tremendous reduction and stability of wind speed in vegetation area by changing the porosity. This study aims to examine a variety of the wind fence, which varies the porosity (i.e., ф = 0.1, 0.2, 0.3, 0.35, 0.4, 0.45, 0.5, 0.7) and the location of a porous fence placed in a simulated turbulent boundary layer. The sheltering effect was observed by the mean and fluctuating quantities such as velocity and pressure variation in the wake of porous fences. The study performed a numerical simulation by using a 2-equation RANS model such as k-ε turbulence closure models, k-ω SST, and LES models. The study analyzes wind and pressure characteristics behind wind fences under flat smooth surface as well as rough. In a preliminary result, the wind speed behind the wind fence decreased more than 50\% in the porosity 0.1-0.6, which is considered as the wind-protect (i.e., stable) area. In addition, the numerical predictions show good agreements with the existing experiments. Regarding optimum porosity, around 0.3-0.5 seems to be most effective in terms of reduction in wind speed and fluctuating pressure in the wake of wind fence. [Preview Abstract] |
Monday, November 25, 2019 3:03PM - 3:16PM |
L38.00007: Catch and release of bubbles in a soft granular medium Chris MacMinn, Jian Hui Guan, Omid Dorostkar, Sungyon Lee A liquid-saturated packing of soft particles can behave like a complex fluid or like a porous solid, depending on the solid fraction. In the fluid-like state, invading gas bubbles will rise through the packing due to buoyancy with a rise velocity that decreases as the solid fraction increases. In the solid-like state, invading gas bubbles cannot rise unless their buoyancy overcomes the capillary entry pressure between the particles, in which case they will rise by migrating through the pore space of the packing. Here, we combine laboratory experiments with discrete-element simulations to show that the motion of gas bubbles through such a packing can be controlled by exploiting this dichotomy: Active manipulation of the solid fraction in a soft porous medium can be used for on-demand catch and release of individual gas bubbles. [Preview Abstract] |
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