Nanocatalytic chemohydrodynamic instability: Deposition effects

Dastvareh, B.; Azaiez, Jalel; Tsai, Peichun Amy

doi:10.1103/physreve.100.053102

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…Understanding and controlling the miscible viscous fingering have been the focus of many studies in the current and past decades. In this regard, the effects of nonmonotonic viscosity profile (Manickam & Homsy, 1993), multiple diffusivities (Azaiez & Sajjadi, 2012; Mishra et al, 2010), permeability heterogeneity (Nicolaides et al, 2015; De Wit & Homsy, 1998), mechanical dispersion (Ghesmat & Azaiez, 2008; Zimmerman & Homsy, 1991), adsorption (Rana et al, 2019), non‐Newtonian fluids (Singh & Azaiez, 2001), chemical reactions (Gérard & De Wit, 2009; Hejazi & Azaiez, 2010; De Wit, 2020), nanoparticles and nanocatalysts (Dastvareh et al, 2019; Sabet et al, 2017; Sabet et al, 2018), and nonisothermal displacement (Islam & Azaiez, 2010) have been investigated in the past. Among the first efforts for simulation of viscous fingering in porous media was the study conducted by Peaceman and Rachford (1962) based on the finite difference scheme.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the injection of nanoparticles into porous media, for purposes such as control of viscous fingering (Sabet et al, 2017), remediation of contaminated soils (Mueller & Nowack, 2010), and in situ upgrading of heavy oil (Hashemi et al, 2014), has received much attention, recently. To the best of our knowledge, in all the theoretical works investigating the effect of nanoparticle on viscous fingering, the deposition of particles was assumed not to impact the porosity and permeability fields (Dastvareh et al, 2019; Ghesmat et al, 2011; Sabet et al, 2017). In this regard, incorporation of porosity and permeability variations due to particle deposition requires a new formulation of the governing equations of flow and transport that is the focus of this study.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of Viscous Fingering in Porous Media in the Presence of In Situ Formed Precipitates and Their Subsequent Deposition

Sabet

Abedi

2020

Water Resources Research

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Understanding the dynamics of miscible viscous fingering is of paramount importance in a wide range of applications, from groundwater hydrology to enhanced oil recovery. In this work, we investigate the effect of precipitation and deposition of an initially dissolved component and the subsequent porosity and permeability variations on miscible viscous fingering in porous media. The commonly used stream function-vorticity formulation does not allow for nonsolenoidality of the velocity vector, which is the case when the porosity field varies with time. This is why we develop a velocity-vorticity formulation, making no further simplifications on the flow field. For numerical simulations, the governing equations are solved using the hybridization of pseudospectral and compact finite difference methods, and the time stepping is carried out through high-order semi-implicit schemes. Using our methodology, we tackle the problem of precipitation of an initially dissolved component through an infinitely fast and reversible reaction. It is found that the deposition of the formed precipitates in porous media results in more severe interfacial instabilities, the effect of which is attenuated as the viscosity ratio between the displacing and resident fluids increases. In addition, our results show that the formed precipitates are mostly concentrated around the interface where the two fluids actively mix. We also characterize the alterations of the local and global permeability fields, and interestingly, we find that the ultimate value of the overall permeability of the porous media scales linearly with the log-viscosity ratio at any fixed deposition rate. It is worth mentioning that, without loss of generality, the developed methodology and analysis in this study are applicable to other forms of precipitation reactions (e.g., finite rate and irreversible) in porous media.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamics of Viscous Fingering in Porous Media in the Presence of In Situ Formed Precipitates and Their Subsequent Deposition

Sabet

Abedi

2020

Water Resources Research

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Hydrodynamic analysis of nanofluid’s convective heat transfer in channels with extended surfaces

et al. 2021

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The effects of nanoparticles (NPs) on heat transfer in extended surface channels have been analyzed using a two-component (TC) model. The results show that unlike the single-component model, the TC model leads to more accurate predictions of the system’s heat transfer performance as a result of the direct influence of the NPs’ distribution on the hydrodynamics. It is found that the average Nusselt number varies non-monotonically with the block’s heights, and the trend is explained by the interplay between heat transfer mechanisms and the hydrodynamics. A similar non-monotonic trend observed in the case of the friction factor has been explained by the variations of the concentration- and temperature-dependent viscosity of the nanofluids. A guideline for an optimum design based on the combination of the variation of average Nusselt number and friction factor with respect to the geometrical parameters has also been presented.

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Heat transfer analysis of immiscible slug flow-based microchannels: Study of channels with extended surfaces

et al. 2022

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Immiscible injection of slug(s) into a microchannel with square blocks attached to the bottom surface of the channel is studied using the phase-field approach for interface tracking. It is confirmed that immiscible injection enhances heat transfer by up to 85% compared to miscible injection considering identical thermophysical properties. The differences in the rate of heat removal between immiscible and miscible injection are explained by the hydrodynamics of the system. It is also found that larger injected slug size does not necessarily result in greater heat removal and causes the average Nusselt number to behave non-monotonically, reaching an optimum value at a specific slug length. This non-monotonic trend has been explained by analyzing the hydrodynamics of the system. The effect of the inter-block distance generally showed a monotonic increasing trend for the average Nusselt number, except for a single slug length. This behavior has been explained by the vorticity and Fourier transform analysis. An alternating slug injection configuration has also been analyzed. The analysis of this configuration reveals a non-monotonic behavior of the average Nusselt number vs the number of injected slugs. This non-monotonic behavior shows that for each value of the selected slug length, there is a critical number of slugs, and consequently, a critical slug length for which the average Nusselt number reaches a maximum. The hydrodynamics of the system justifies this non-monotonic behavior. Finally, the friction factor and performance evaluation criterion are presented as a guideline for the design of the microchannels based on flow configuration.

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Nanocatalytic chemohydrodynamic instability: Deposition effects

Cited by 4 publications

References 29 publications

Dynamics of Viscous Fingering in Porous Media in the Presence of In Situ Formed Precipitates and Their Subsequent Deposition

Dynamics of Viscous Fingering in Porous Media in the Presence of In Situ Formed Precipitates and Their Subsequent Deposition

Hydrodynamic analysis of nanofluid’s convective heat transfer in channels with extended surfaces

Heat transfer analysis of immiscible slug flow-based microchannels: Study of channels with extended surfaces

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