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4 results for “Viscous Fingering”
Miscible viscous fingering in a quarter-spot Hele-Shaw cell: Experimental dataset
<p>This is the experimental dataset associated with the paper 'The effect of viscosity ratio and Peclet number on miscible viscous fingering in a Hele-Shaw cell: A combined numerical and experimental study' by Keable et al. 2021 - preprint available at https://arxiv.org/abs/2111.06548. This repository includes image and volumetric data described in the main paper. The images are used in the processing code available at https://github.com/sci-sjj/MiscibleViscousFingering.</p> <p>Images are included for M2, M5, M10 and M20 mobility ratios, performed at flowrate Q = 1ml/min. For M=20, we also include Q=0.1ml/min (filename M20_0_1mlpm), Q=0.5ml/min (filename M20_0_5mlpm), Q=5ml/min (filename M20_5mlpm) and Q=10ml/min (filename M20_10mlpm). Multiple repeat experiments are given filename extension v2, v3 etc (some experiments did not work so there may be missing v1 etc, extensions). The experiments at each flow rate and mobility ratio then have the following zipped folders containing images:</p> <ol> <li>_exp_images_time_lapse_raw.zip. These are the raw image files.</li> <li>_exp_images_time_lapse_processed.zip. These are cropped images from 1. </li> <li>_exp_images_time_lapse_final.zip. These are geometric transforms of 2, to be centered and aligned. They represent the final processed images.</li> <li>_exp_images_selected_PV.zip. These are selected images from 3 at different pore-volumes injection and times as a fraction of the breakthrough time.</li> <li>_exp_images_time_lapse_segmented.zip. These are segmented images used in interfacial calculations. </li> </ol> <p>Each image file in the above zipped folders follows the same prefix naming convention (e.g. M2_V2) followed by a number, e.g. (1000). Time sequences start at number 1000. Image capture times can be found in the image properties of the raw details to give aquisition rates. Full experimental details are listed in the paper, and also in the excel summary files on the github repository above. <br> <br> We include simulation image results, txt based macroscopic experimental results and literature results in zipped folders. These can be run using the github processing codes to produce the figures/analysis in the main paper. </p>
Suppressing viscous fingering in structured porous media
<p>Finger-like protrusions that form along fluid−fluid displacement fronts in porous media are often excited by hydrodynamic instability<br> when low-viscosity fluids displace high-viscosity resident fluids. Such interfacial instabilities are undesirable in many natural and engineered displacement processes.We report a phenomenon whereby gradual and monotonic variation of pore sizes along the<br> front path suppresses viscous fingering during immiscible displacement, that seemingly contradicts conventional expectation of enhanced instability with pore size variability. Experiments and pore-scale numerical simulations were combined with an analytical<br> model for the characteristics of displacement front morphology as a function of the pore size gradient. Our results suggest that the<br> gradual reduction of pore sizes act to restrain viscous fingering for a predictable range of flow conditions (as anticipated by gradient<br> percolation theory). The study provide insights into ways for suppressing unwanted interfacial instabilities in porous media, and provides design principles for new engineered porous media such as exchange columns, fabric, paper, and membranes with respect to their desired immiscible displacement behavior.</p>
Compression-driven viscous fingering: Experimental and numerical data
<p>These data are from experiments and numerical simulations of viscous fingering in a rigid, radial, oil-filled Hele-Shaw cell driven by the compression of a connected air reservoir. The methods and data are presented in the authors' joint-submissions and their supporting information:</p> <ul> <li>L. C. Morrow, C. Cuttle, and C. W. MacMinn, Gas compression systematically delays the onset of viscous fingering, Physical Review Letters 131, 224002 (2023).</li> <li>C. Cuttle, L. C. Morrow, and C. W. MacMinn, Compression-driven viscous fingering in a radial Hele-Shaw cell, Physical Review Fluids 8, 113904 (2023).</li> </ul> <p>We here provide all raw data for 2 experimental repetitions and 5 numerical repetitions, over the full range of parameters reported.</p> <p>See README file for full details.</p> <p>VERSION 2: The pressure data are now given in the correct units of Pa. Note that the pressure data in Version 1 are identical, except for the fact that they are mistakenly given in units of PSI.</p>
Viscous fingering in fractured porous media
<p>Data from numerical simulations of viscous fingering in fractured porous media.</p> <p>The folder structure of the dataset is given as follows:</p> <p>res_NAME_OF_FRACTURE_GEOMETRY/NAME_OF_VARIABLE/csv/DATA_FILES.</p> <p>The name of the DATA_FILES gives the values of the dimensionless parameters used in the simulation that generated the datafile. The last part of the name (*_task_TASKNUMBER_run_RUNNUMBER.csv) is an identifyer for the simulation and can for most purposes be ignored.</p> <p>The first line of each file is the header with items:</p> <ul> <li>time (dimensionless time of time-step)</li> <li>average_c (the volume averaged concentration in the simulation domain)</li> <li>L05 (the mixing region length in fractures and rock matrix with treshold c<0.05)</li> <li>Lm05 (the mixing region length in rock matrix with treshold c<0.05)</li> <li>Lf05 (the mixing region length in fractures with treshold c<0.05)</li> <li>L01 (the mixing region length in fractures and rock matrix with treshold c<0.01)</li> <li>Lm01 (the mixing region length in rock matrix with treshold c<0.01)</li> <li>Lf01 (the mixing region length in fractures with treshold c<0.01)</li> <li>L001 (the mixing region length in fractures and rock matrix with treshold c<0.001)</li> <li>Lm001 (the mixing region length in rock matrix with treshold c<0.001)</li> <li>Lf001 (the mixing region length in fractures with treshold c<0.001)</li> <li>num_fingers (the number of fingers in the domain)</li> </ul> <p>Each successive line gives the results of a time-step in the simulation.</p> <p> </p>
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