Dynamic control of droplets and pockets formation in homogeneous porous media immiscible displacements

Lins, Tiago; Azaiez, Jalel

doi:10.1063/1.5009466

Cited by 2 publications

(2 citation statements)

References 58 publications

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“…The droplet remained unblended with soil water during the two first consecutive wetting–drying cycles, and during the third cycle it mixed with the surrounding water and eventually disappeared. Differences in salinity and viscosity between the droplet and the surrounding water have been described (Kwak et al, 2005; Lins and Azaiez, 2018).…”

Section: Resultsmentioning

confidence: 99%

Environmental Scanning Electron Microscopy Application for Brackish Water Irrigation Impact on Soil

Valdés-Abellán

Candela²,

Medero

et al. 2019

Vadose Zone Journal

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Core Ideas Long‐term irrigation with brackish water can extend the practice into water‐scarce regions. ESEM in both dynamic and static modes is a promising technique to analyze soil impacts. Changes linked to the hydrophilic behavior of soils can be detected. We investigated soil response to irrigation with slightly brackish water (1200 mg L−1 total dissolved solids on average) in a semiarid environment at the microscopic scale using environmental scanning electron microscopy (ESEM) applied in static and dynamic modes, which allowed comparison between nonirrigated and 3‐yr‐irrigated soil samples to determine the impact of applied brackish water. Results indicate that (i) there was a change in soil hydrophilic behavior by the continuous accumulation of water‐borne salt in the soil matrix, (ii) compared with nonirrigated samples, the wetting process occurred more gradually for the 3‐yr‐irrigated sample, (iii) the wetting process started at a lower vapor pressure for the 3‐yr‐irrigated sample, (iv) water vapor pressure in the chamber at full saturation was lower for the 3‐yr‐irrigated sample, and (v) the presence of heavy metals in the soil was more frequent in irrigated samples. Our results show that ESEM is a useful technique to determine the impacts on soil of irrigation with slightly brackish water.

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Section: Resultsmentioning

confidence: 99%

Environmental Scanning Electron Microscopy Application for Brackish Water Irrigation Impact on Soil

Valdés-Abellán

Candela²,

Medero

et al. 2019

Vadose Zone Journal

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“…In 2017, Azaiez and Lins [33] studied the pseudo-resonance motions of the radial injection ow of immiscible uids in a homogeneous porous media and obtained the critical value of the uid injection period. Also, the dynamic control simulations of the states of pockets and droplets in immiscible displacements in porous media were performed by Lins and Azaiez [34] in 2018, and the results of this study showed that time-dependent cyclic plans can be used to control the formation of droplets / pockets in The ow, and in particular the delay of their appearance, through the proper combination of amplitude and period of displacement plan. In one study by Surguchev [35], the effect of water ow cycle injection on the simulation of a heterogeneous reservoir was investigated and it was observed that the e ciency in the constant injection process was improved.…”

Section: Introductionmentioning

confidence: 92%

Effects of transient injection-suction on interfacial dynamics in immiscible Newtonian fluid-fluid radial displacement in Hele-Shaw cell

Ahmadlouydarab

Kangari

Asadzadeh

2022

Preprint

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In this experimental study, the instabilities created at the contact surface of two Newtonian immiscible fluids i.e., water and base oil during transient radial injection-suction inside Hele-Shaw cell were investigated. Base oil with viscosities of 150, 920 and 1506 cSt was used for injection and suction purposes. The maximum injection and suction fluid flow rates that were pseudo-sinusoidal and percussive time-dependent were considered to be 10000, 20000 and 30000 µl/min. The amount of fluid injected or sucked in all three methods was considered equal. The results were compared with the results of constant velocity injection. The effects of injection and suction frequency on contact surface instability were also studied. Injection and suction were performed for at least six complete cycles. One of the most important objectives of this study was to investigate the ability to eliminate instabilities and return the contact surface of two fluids to the initial circular state at the end of each cycle. It was observed in the methods of percussive and constant-velocity that it is not possible to return to the initial circle after the first step. It was also observed that the growth rate of instabilities in different cycles of the pseudo-sinusoidal method is slower than the percussive and constant-velocity methods. The lower the viscosity and flow rate of the injected or suction fluid, the less instability occurs. The results showed that with increasing the flow rate, the number of oil packets in the injection-suction of constant-velocity method has increased, but in the reverse percussive method, this is the case. The results showed that in the injection-suction by pseudo-sinusoidal method, which do not cause instabilities such as water droplets, fingers and oil packets, but in two methods of injection-suction at a constant-velocity and percussive method, such instabilities are observed. It can be concluded that considering the conditions of the experiments performed, the pseudo-sinusoidal method is the most suitable method with the ability to return to the initial steady state among the three methods used. Of course, it should be noted that the greater the number of repetitions of cycles, the more instabilities created and the more difficult it is to return to the initial state.

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Dynamic control of droplets and pockets formation in homogeneous porous media immiscible displacements

Cited by 2 publications

References 58 publications

Environmental Scanning Electron Microscopy Application for Brackish Water Irrigation Impact on Soil

Environmental Scanning Electron Microscopy Application for Brackish Water Irrigation Impact on Soil

Effects of transient injection-suction on interfacial dynamics in immiscible Newtonian fluid-fluid radial displacement in Hele-Shaw cell

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