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Abhijit Chaudhuri

Bio: Abhijit Chaudhuri is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Concentration polarization & Convection. The author has an hindex of 14, co-authored 44 publications receiving 656 citations. Previous affiliations of Abhijit Chaudhuri include Indian Institute of Science & University of Colorado Boulder.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the results of continuous injection of CO2 from a well that is screened inside the aquifer between caprock at the top and bedrock at the bottom were discussed.

16 citations

Journal ArticleDOI
TL;DR: A stochastic analysis of macrodispersion for conservative solute transport in three-dimensional (3D) heterogeneous statistically isotropic and anisotropic porous media when both hydraulic conductivity and local dispersivity are random is presented in this article.
Abstract: A stochastic analysis of macrodispersion for conservative solute transport in three-dimension (3D) heterogeneous statistically isotropic and anisotropic porous media when both hydraulic conductivity and local dispersivity are random is presented. Analytical expressions of macrodispersivity are derived using Laplace and Fourier transforms. The effects of various parameters such as ratio of transverse to longitudinal local dispersivity, correlation length ratio, correlation coefficient and direction of flow on asymptotic macrodispersion are studied. The behaviour of growth of macrodispersivity in preasymptotic stage is also shown in this paper. The variation in local dispersion coefficient causes change in transverse macrodispersivity. The consideration of random dispersivity along with random hydraulic conductivity indicates that the total dispersion is affected and important in the case when the hydraulic conductivity and dispersivity are correlated. It is observed that the pre-asymptotic behavior of the macrodispersivity is not sensitive to the choice of spectral density functions.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the authors compared the effects of rotor speed, feed pressure and aspect ratio on concentration polarization and permeate flux reduction in a closed roto-dynamics cross-flow RO system and the specific energy consumptions for all cases were compared.

13 citations

Journal ArticleDOI
TL;DR: In this article, the authors consider aperture alteration by precipitation in a "gradient-reaction" regime where fluids are close to chemical equilibrium with a mineral everywhere, but precipitation is driven by solubility gradients.
Abstract: [1] Precipitation and dissolution reactions in fractures alter apertures, which in turn affects their flow and transport properties. We consider aperture alteration by precipitation in a “gradient-reaction” regime where fluids are close to chemical equilibrium with a mineral everywhere, but precipitation is driven by solubility gradients. Monte Carlo simulations on computer-generated aperture fields suggest that the most important feature of fracture alteration by precipitation is the formation of elongated precipitate bodies perpendicular to the mean flow direction. The simulation results provide a basis for a proposed upscaling relationship between mean aperture and the effective transmissivity tensor, incorporating a critical aperture at which the transmissivity decreases steeply.

13 citations

Journal ArticleDOI
TL;DR: In this paper, the fluid flow analysis of a symmetric airfoil having circular cavities on its suction surface at three different chordwise locations from leading to trailing edges is presented.
Abstract: The paper presents the fluid flow analysis of a symmetric airfoil having circular cavities on its suction surface at three different chordwise locations from leading to trailing edges. The leading edge cavity shapes were distorted using Bezier polynomial so that vortex trapping pattern in the cavities can be captured. Structured meshing scheme via a multi-block strategy was employed. Unsteady simulations were performed by a Reynolds averaged Navier-Stokes (RANS) solver. Lift, drag, pressure and skin friction coefficients were monitored at Reynolds number (Re) = 15 × 104 and 6 × 105 and different angles of attack. Cavity placed at the trailing edge produced better lift to drag ratio as compared to that of the other cavities. The distorted cavities performed badly in terms of lift and drag coefficients. The elliptical cavity shape showed better results at the angles of attack up to 10°.

12 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors provide an updated review of studies related to membrane modules (plate and frame, tubular, spiral wound, and hollow fiber) and membrane characterization and discuss membrane cleaning and different pre-treatment technologies in place for RO desalination, such as feed-water pretreatment and biocides.

660 citations

Journal ArticleDOI
TL;DR: In this paper, an enhanced geothermal system with multilateral wells is proposed to extract heat from hot dry rock, where one main wellbore is drilled to hot dry rocks and several injection and production multilateral well are side-tracked from the main well bore in upper and lower formation, respectively.

221 citations

Journal ArticleDOI
TL;DR: In this article, a review of porosity-permeability relations in simulation models on the REV scale is presented, with a focus on the porosity at which the porous medium becomes impermeable.
Abstract: Reactive transport processes in a porous medium will often both cause changes to the pore structure, via precipitation and dissolution of biomass or minerals, and be affected by these changes, via changes to the material’s porosity and permeability. An understanding of the pore structure morphology and the changes to flow parameters during these processes is critical when modeling reactive transport. Commonly applied porosity–permeability relations in simulation models on the REV scale use a power-law relation, often with slight modifications, to describe such features; they are often used for modeling the effects of mineral precipitation and/or dissolution on permeability. To predict the reduction in permeability due to biomass growth, many different and often rather complex relations have been developed and published by a variety of authors. Some authors use exponential or simplified Kozeny–Carman relations. However, many of these relations do not lead to fundamentally different predictions of permeability alteration when compared to a simple power-law relation with a suitable exponent. Exceptions to this general trend are only few of the porosity–permeability relations developed for biomass clogging; these consider a residual permeability even when the pore space is completely filled with biomass. Other exceptions are relations that consider a critical porosity at which the porous medium becomes impermeable; this is often used when modeling the effect of mineral precipitation. This review first defines the scale on which porosity–permeability relations are typically used and aims at explaining why these relations are not unique. It shows the variety of existing approaches and concludes with their essential features.

167 citations

Journal ArticleDOI
15 Mar 2015-Energy
TL;DR: In this paper, a three-dimensional thermo-hydro-mechanical coupled model of fractured media was established to simulate the extraction of HDR (Hot dry rock) geothermal energy based on the geological characteristics of Tengchong geothermal field in China.

148 citations

Journal ArticleDOI
TL;DR: In this article, a fully coupled thermal-hydraulic-mechanical (THM) finite element model is presented for fractured geothermal reservoirs, where fractures are modelled as surface discontinuities within a three-dimensional matrix.

139 citations