Energy capillary number reveals regime transition of imbibition in porous media

2021 ◽  
Vol 33 (12) ◽  
pp. 123111
Author(s):  
Guangpu Zhu ◽  
Lei Zhang ◽  
Jun Yao
Keyword(s):  
Porous Media ◽  
Capillary Number ◽  
Regime Transition

scholarly journals Rheology of High-Capillary Number Two-Phase Flow in Porous Media

2019 ◽  
Vol 7 ◽  
Author(s):  
Santanu Sinha ◽  
Magnus Aa. Gjennestad ◽  
Morten Vassvik ◽  
Mathias Winkler ◽  
Alex Hansen ◽  
...  
Keyword(s):  
Porous Media ◽  
Capillary Number ◽  
Two Phase Flow ◽  
Flow In Porous Media ◽  
Phase Flow ◽  
Two Phase

Two-Phase Flow in Porous Media: Predicting Its Dependence on Capillary Number and Viscosity Ratio

2010 ◽  
Vol 86 (1) ◽  
pp. 243-259 ◽  
Author(s):  
M. Ferer ◽  
Shelley L. Anna ◽  
Paul Tortora ◽  
J. R. Kadambi ◽  
M. Oliver ◽  
...  
Keyword(s):  
Porous Media ◽  
Capillary Number ◽  
Two Phase Flow ◽  
Viscosity Ratio ◽  
Flow In Porous Media ◽  
Phase Flow ◽  
Two Phase

scholarly journals Examining the Effect of Flow Rate Ratio on Droplet Generation and Regime Transition in a Microfluidic T-Junction at Constant Capillary Numbers

Inventions ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 54 ◽  
Author(s):  
Katerina Loizou ◽  
Voon-Loong Wong ◽  
Buddhika Hewakandamby
Keyword(s):  
Transition Region ◽  
Flow Rate ◽  
Capillary Number ◽  
Rate Ratio ◽  
Continuous Phase ◽  
Flow Rate Ratio ◽  
Phase Flow ◽  
Regime Transition ◽  
Droplet Volume ◽  
Rate Ratios

The focus of this work is to examine the effect of flow rate ratio (quotient of the dispersed phase flow rate over the continuous phase flow rate) on a regime transition from squeezing to dripping at constant capillary numbers. The effect of the flow rate ratio on the volume of droplets generated in a microfluidic T-junction is discussed, and a new scaling law to estimate their volume is proposed. Existing work on a regime transition reported by several researchers focuses on the effect of the capillary number on regime transition, and the results that are presented in this paper advance the current understanding by indicating that the flow rate ratio is another parameter that dictates regime transition. In this paper, the transition between squeezing and dripping regimes is reported at constant capillary numbers, with a transition region identified between squeezing and dripping regimes. Dripping is observed at lower flow rate ratios and squeezing at higher flow rate ratios, with a transition region between the two regimes at flow rate ratios between 1 and 2. This is presented in a flow regime map that is constructed based on the observed mechanism. A scaling model is proposed to characterise droplet volume in terms of flow rate ratio and capillary number. The effect of flow rate ratio on the non-dimensional droplet volume is presented, and lastly, the droplet volume is expressed in terms of a range of parameters, such as the viscosity ratio between the dispersed and the continuous phase, capillary number, and the geometrical characteristics of the channels.

scholarly journals Modeling Immiscible Fluid Displacement in a Porous Medium Using Lattice Boltzmann Method

Fluids ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 89
Author(s):  
Magzhan Atykhan ◽  
Bagdagul Kabdenova (Dauyeshova) ◽  
Ernesto Monaco ◽  
Luis R. Rojas-Solórzano
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Lattice Boltzmann ◽  
Capillary Number ◽  
Viscosity Ratio ◽  
Penetration Rate ◽  
Surface Wettability ◽  
Gas Viscosity ◽  
Boltzmann Method ◽  
Gas Penetration

The numerical investigation of the interpenetrating flow dynamics of a gas injected into a homogeneous porous media saturated with liquid is presented. The analysis is undertaken as a function of the inlet velocity, liquid–gas viscosity ratio (D) and physical properties of the porous medium, such as porous geometry and surface wettability. The study aims to improve understanding of the interaction between the physical parameters involved in complex multiphase flow in porous media (e.g., CO2 sequestration in aquifers). The numerical simulation of a gaseous phase being introduced through a 2D porous medium constructed using seven staggered columns of either circular- or square-shaped micro-obstacles mimicking the solid walls of the pores is performed using the multiphase Lattice Boltzmann Method (LBM). The gas–liquid fingering phenomenon is triggered by a small geometrical asymmetry deliberately introduced in the first column of obstacles. Our study shows that the amount of gas penetration into the porous medium depends on surface wettability and on a set of parameters such as capillary number (Ca), liquid–gas viscosity ratio (D), pore geometry and surface wettability. The results demonstrate that increasing the capillary number and the surface wettability leads to an increase in the effective gas penetration rate, disregarding porous medium configuration, while increasing the viscosity ratio decreases the penetration rate, again disregarding porous medium configuration.

Definition of the capillary number for two-phase filtration flows in anisotropic porous media

2015 ◽  
Vol 60 (1) ◽  
pp. 42-45
Author(s):  
N. M. Dmitriev ◽  
M. N. Kravchenko ◽  
M. N. Dmitriev
Keyword(s):  
Porous Media ◽  
Capillary Number ◽  
Two Phase ◽  
Anisotropic Porous Media ◽  
Definition Of
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