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nanofluidics
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On the adsorption behavior of a fluorochemical onto carbonate rock with the application of wettability alteration to a gas wetting condition
, Article Journal of Molecular Liquids ; Volume 326 , 2021 ; 01677322 (ISSN) ; Azadi Tabar, M ; Shafiei, Y ; Fakhroueian, Z ; Ghazanfari, M. H ; Sharif University of Technology
Elsevier B.V
2021
Abstract
In this study, some new aspects of adsorption of a fluorochemical onto carbonate rocks as a wettability alteration agent to a gas wetting condition with the potential application for reduction of condensate blockage in gas condensate reservoirs are presented. To achieve this, kinetics, equilibrium, and thermodynamic of the adsorption process besides contact angle, imbibition, and characterization tests are investigated. Results of adsorption experiments revealed that kinetics behavior of the utilized fluorochemical–calcite system obeyed the pseudo-second order kinetics model. There was no change in adsorption after about 20 h. Also, the intraparticle diffusion mechanism was not the only rate...
The numerical investigation of the heat transport in the nanofluids under the impacts of magnetic field: applications in industrial zone
, Article Mathematical Problems in Engineering ; Volume 2021 , 2021 ; 1024123X (ISSN) ; Khan, U ; Ahmed, N ; Mohyud-Din, S. T ; Khan, I ; Fayz-Al-Asad, M ; Sharif University of Technology
Hindawi Limited
2021
Abstract
The dynamics of the nanofluid flow between two plates that are placed parallel to each other is of huge interest due to its numerous applications in different industries. Keeping in view the significance of such flow, investigation of the heat transfer in the Cu-H2O nanofluid is conducted between parallel rotating plates. For more significant results of the study, the squeezing effects are incorporated over the plates that are electrically conducting. The nondimensional flow model is then treated analytically (VPM), and the results are sketched against the preeminent flow parameters. The remarkable heat transfer in the nanofluid is noticed against the Eckert and Prandtl numbers, whereas the...
Novel thermal aspects of hybrid nanoparticles Cu-TiO2 in the flow of ethylene glycol
, Article International Communications in Heat and Mass Transfer ; Volume 129 , 2021 ; 07351933 (ISSN) ; Ali, K ; Faridi, A. A ; Ashraf, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Hybrid nanoparticles possess better chemical stability, mechanical resistance, thermal conductivity, physical strength and so forth as equated to pure nanoparticles. The present work describes the novel features of hybrid nanoparticles such as Titanium oxide (TiO2) and Copper (Cu) in the flow of Ethylene glycol (EG) under the induced magnetic field environment. The analysis covers the features of both pure nanofluid Cu/EG and hybrid nanofluid Cu-TiO2/EG. The concentration equation is amended by the activation energy term. The amalgamation of Cu-TiO2/EG exhibits improved and embellished thermal characteristics. A persuasive numerical technique named “Successive over Relaxation” is used to...
Heat and mass transfer attributes of copper-aluminum oxide hybrid nanoparticles flow through a porous medium
, Article Case Studies in Thermal Engineering ; Volume 25 , 2021 ; 2214157X (ISSN) ; Ali, K ; Rizwan, M ; Ashraf, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Hybrid nanofluids possess better mechanical resistance, physical strength, chemical stability, thermal conductivity and so forth as compared to individual nanoliquids. Our approach in the present work is to offer a novel study involving MHD flow of hybrid nanoparticles with viscous dissipation effect through a porous medium past a stretching surface. A powerful tool of similarity transformation is utilized to transmute the governing flow model PDEs into ordinary ones. The entire system of nonlinear coupled differential equations along with boundary conditions is tackled numerically by means of Successive over Relaxation (SOR) technique. Two distinctive fluids, named Al2O3-Cu/water (hybrid...
Mhd flow of cu-al2o3/water hybrid nanofluid through a porous media
, Article Journal of Porous Media ; Volume 24, Issue 7 , 2021 , Pages 61-73 ; 1091028X (ISSN) ; Ali, K ; Ashraf, M ; Sharif University of Technology
Begell House Inc
2021
Abstract
Hybrid nanoliquids comprise of better physical strength, mechanical resistance, thermal conductivity, and chemical stability as equated to individual nanoliquids. In this paper, MHD hybrid nanoparticle flow with heat and mass transfer attributes is numerically investigated. Flow is taken over a stretching surface embedded in a porous medium. The governing flow model partial differential equations (PDEs) are transformed into ordinary differential equations (ODEs) using a powerful tool of similarity transformations. The relevant system of differential equations and boundary conditions are numerically treated with the successive over-relaxation (SOR) technique. Heat and mass transfer features...
Experimental investigations of the performance of a flat-plate solar collector using carbon and metal oxides based nanofluids
, Article Energy ; Volume 227 , 2021 ; 03605442 (ISSN) ; Montazer, E ; Kazi, S. N ; Soudagar, M. E. M ; Ahmed, W ; Zubir, M. N. M ; Afzal, A ; Muhammad, M. R ; Ali, H. M ; Márquez, F. P. G ; Sarsam, W. S ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Covalently functionalized carbon nanoplatelets and non-covalent functionalized metal oxides nanoparticles (surfactant-treated) have been used to synthesize water-based nanofluids in this paper. To prove nanofluid stability, ultraviolet–visible (UV–vis) spectroscopy is used, and the results show that nanofluid is stable for sixty days for carbon and thirty days for metal oxides. The thermophysical properties are evaluated experimentally and validated with theoretical models. Thermal conductivities of f-GNPs, SiO2, and ZnO nanofluids are enhanced by 25.68%, 11.49%, and 15.42%, respectively. Lu-Li and Bruggeman's thermal conductivity models are correctly matched with the experimental data....
Simulation analysis of MHD hybrid Cu-Al2O3/H2O nanofluid flow with heat generation through a porous media
, Article International Journal of Energy Research ; Volume 45, Issue 13 , 2021 , Pages 19165-19179 ; 0363907X (ISSN) ; Ahmad, S ; Nisar, K. S ; Faridi, A. A ; Ashraf, M ; Sharif University of Technology
John Wiley and Sons Ltd
2021
Abstract
Hybrid nanoliquids comprise of better physical strength, mechanical resistance, thermal conductivity, and chemical stability as equated to individual nanoliquids. The present work investigates the MHD laminar flow, containing hybrid nanoparticles, with heat transfer phenomenon over a stretching sheet immersed in a porous medium. The effect of induced magnetic field has also been taken into account. The flow model PDEs are rehabilitated into ordinary ones using a persuasive tool of similarity variables. The analogous system of dimensionless equations alongside the boundary conditions is numerically treated with the Successive-Over-Relaxation (SOR) technique. Flow and heat transfer aspects of...
The numerical investigation of the heat transport in the nanofluids under the impacts of magnetic field: applications in industrial zone
, Article Mathematical Problems in Engineering ; Volume 2021 , 2021 ; 1024123X (ISSN) ; Khan, U ; Ahmed, N ; Mohyud Din, S. T ; Khan, I ; Fayz Al Asad, M ; Sharif University of Technology
Hindawi Limited
2021
Abstract
The dynamics of the nanofluid flow between two plates that are placed parallel to each other is of huge interest due to its numerous applications in different industries. Keeping in view the significance of such flow, investigation of the heat transfer in the Cu-H2O nanofluid is conducted between parallel rotating plates. For more significant results of the study, the squeezing effects are incorporated over the plates that are electrically conducting. The nondimensional flow model is then treated analytically (VPM), and the results are sketched against the preeminent flow parameters. The remarkable heat transfer in the nanofluid is noticed against the Eckert and Prandtl numbers, whereas the...
Novel thermal aspects of hybrid nanoparticles Cu-TiO2 in the flow of ethylene glycol
, Article International Communications in Heat and Mass Transfer ; Volume 129 , 2021 ; 07351933 (ISSN) ; Ali, K ; Faridi, A. A ; Ashraf, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Hybrid nanoparticles possess better chemical stability, mechanical resistance, thermal conductivity, physical strength and so forth as equated to pure nanoparticles. The present work describes the novel features of hybrid nanoparticles such as Titanium oxide (TiO2) and Copper (Cu) in the flow of Ethylene glycol (EG) under the induced magnetic field environment. The analysis covers the features of both pure nanofluid Cu/EG and hybrid nanofluid Cu-TiO2/EG. The concentration equation is amended by the activation energy term. The amalgamation of Cu-TiO2/EG exhibits improved and embellished thermal characteristics. A persuasive numerical technique named “Successive over Relaxation” is used to...
Heat and mass transfer attributes of copper-aluminum oxide hybrid nanoparticles flow through a porous medium
, Article Case Studies in Thermal Engineering ; Volume 25 , 2021 ; 2214157X (ISSN) ; Ali, K ; Rizwan, M ; Ashraf, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Hybrid nanofluids possess better mechanical resistance, physical strength, chemical stability, thermal conductivity and so forth as compared to individual nanoliquids. Our approach in the present work is to offer a novel study involving MHD flow of hybrid nanoparticles with viscous dissipation effect through a porous medium past a stretching surface. A powerful tool of similarity transformation is utilized to transmute the governing flow model PDEs into ordinary ones. The entire system of nonlinear coupled differential equations along with boundary conditions is tackled numerically by means of Successive over Relaxation (SOR) technique. Two distinctive fluids, named Al2O3-Cu/water (hybrid...
Mhd flow of cu-al2o3/water hybrid nanofluid through a porous media
, Article Journal of Porous Media ; Volume 24, Issue 7 , 2021 , Pages 61-73 ; 1091028X (ISSN) ; Ali, K ; Ashraf, M ; Sharif University of Technology
Begell House Inc
2021
Abstract
Hybrid nanoliquids comprise of better physical strength, mechanical resistance, thermal conductivity, and chemical stability as equated to individual nanoliquids. In this paper, MHD hybrid nanoparticle flow with heat and mass transfer attributes is numerically investigated. Flow is taken over a stretching surface embedded in a porous medium. The governing flow model partial differential equations (PDEs) are transformed into ordinary differential equations (ODEs) using a powerful tool of similarity transformations. The relevant system of differential equations and boundary conditions are numerically treated with the successive over-relaxation (SOR) technique. Heat and mass transfer features...
Experimental investigations of the performance of a flat-plate solar collector using carbon and metal oxides based nanofluids
, Article Energy ; Volume 227 , 2021 ; 03605442 (ISSN) ; Montazer, E ; Kazi, S. N ; Soudagar, M. E. M ; Ahmed, W ; Zubir, M. N. M ; Afzal, A ; Muhammad, M. R ; Ali, H. M ; Márquez, F. P. G ; Sarsam, W. S ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Covalently functionalized carbon nanoplatelets and non-covalent functionalized metal oxides nanoparticles (surfactant-treated) have been used to synthesize water-based nanofluids in this paper. To prove nanofluid stability, ultraviolet–visible (UV–vis) spectroscopy is used, and the results show that nanofluid is stable for sixty days for carbon and thirty days for metal oxides. The thermophysical properties are evaluated experimentally and validated with theoretical models. Thermal conductivities of f-GNPs, SiO2, and ZnO nanofluids are enhanced by 25.68%, 11.49%, and 15.42%, respectively. Lu-Li and Bruggeman's thermal conductivity models are correctly matched with the experimental data....
Simulation analysis of MHD hybrid Cu-Al2O3/H2O nanofluid flow with heat generation through a porous media
, Article International Journal of Energy Research ; Volume 45, Issue 13 , 2021 , Pages 19165-19179 ; 0363907X (ISSN) ; Ahmad, S ; Nisar, K. S ; Faridi, A. A ; Ashraf, M ; Sharif University of Technology
John Wiley and Sons Ltd
2021
Abstract
Hybrid nanoliquids comprise of better physical strength, mechanical resistance, thermal conductivity, and chemical stability as equated to individual nanoliquids. The present work investigates the MHD laminar flow, containing hybrid nanoparticles, with heat transfer phenomenon over a stretching sheet immersed in a porous medium. The effect of induced magnetic field has also been taken into account. The flow model PDEs are rehabilitated into ordinary ones using a persuasive tool of similarity variables. The analogous system of dimensionless equations alongside the boundary conditions is numerically treated with the Successive-Over-Relaxation (SOR) technique. Flow and heat transfer aspects of...
A numerical investigation on natural convection heat transfer in annular-finned concentric horizontal annulus using nanofluids: a parametric study
, Article Heat Transfer Engineering ; Volume 42, Issue 22 , 2021 , Pages 1926-1948 ; 01457632 (ISSN) ; Zarei, M. M ; Hakkaki Fard, A ; Sharif University of Technology
Taylor and Francis Ltd
2021
Abstract
Natural convection heat transfer in a concentric horizontal annulus with annular fins is numerically studied. Due to the low thermal conductivity of water, CuO-water and Al2O3-water nanofluids were used as heat transfer fluids. The effect of three different parameters, including fin spacing, fin eccentricity, and fin thickness at different fin diameters and Rayleigh number range of 104 to 9 (Formula presented.) 105, were studied. The obtained results revealed that Al2O3-water nanofluid has the highest heat transfer rate. The calculated heat transfer rates for Al2O3-water nanofluid for Rayleigh numbers of 9 (Formula presented.) 105, 105, and 104 were respectively up to 12.1%, 26.2%, and 31.6%...
Retraction notice to “Numerical study on free convection in a U-shaped CuO/water nanofluid-filled cavity with different aspect ratios using double-MRT lattice Boltzmann” [Therm. Sci. Eng. Progr. 14(2019), 100373]
, Article Thermal Science and Engineering Progress ; Volume 21 , 2021 ; 24519049 (ISSN) ; Hooshmand, P ; Mohammaei, M ; Ross, D ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editor-in-Chief. Concern has been raised about the identity of the author “David Ross” as the listed institution has denied the affiliation of a person with this name. Further inquiry revealed that the names of the co-authors were added to the revised version of the article without notifying the handling Editor, which is contrary to the journal policy on changes to authorship. Also, the co-authors were not able to provide a reasonable description of their contribution to the article....
Characterization of magnetized CNT-based hybrid nanofluid subjected to convective phenomenon
, Article International Journal of Modern Physics B ; Volume 35, Issue 28 , 2021 ; 02179792 (ISSN) ; Khan, W. A ; Aqsa ; Waqas, M ; Abbas, S. Z ; Malik, M. Y ; Alqahtani, A. S ; Sharif University of Technology
World Scientific
2021
Abstract
Hybrid nanofluid gains attention of scientists due to its dynamic properties in various fields, and thus, hybrid nanofluids can be taken as an innovative form of nanofluids. Even though analysts acquire tremendous results in the field of hybrid nanofluids but yet no study has been carried out to predict magnetohydrodynamic effects in such fluid models. In this present analysis, influence of MHD has been investigated for the micro hybrid nanofluid over a stretched surface under convective conditions. Combine boundary layer equations for the flow have been altered into a suitable form via boundary layer approximations. Further, complete nonlinear system of equations has been numerically solved...
LBM investigation of a Cu-water nanofluid over various configurations of pipes in the mixed convection flow
, Article Heat Transfer ; Volume 50, Issue 2 , August , 2021 , Pages 1056-1072 ; 26884534 (ISSN) ; Sharif University of Technology
John Wiley and Sons Inc
2021
Abstract
Increasing the heat capacity of heat exchangers is a crucial need for modern devices. The thermal conductivity of the usual fluids and the Nusselt (Nu) number of flows containing such fluids are two bottlenecks in the way of increasing heat delivery in the heat exchangers. For this reason, nanofluids have been introduced. The effect of utilizing a Cu-water nanofluid as a coolant of two hot pipes in a square cavity is investigated numerically with a two-component lattice Boltzmann method. The volume fraction of nanoparticles is assumed to be constant (0.03) while the Richardson (Ri) number varies from 0.02 to 20. Results show that the effectiveness of nanoparticles is better observed in the...
Effects of perforated anchors on heat transfer intensification of turbulence nanofluid flow in a pipe
, Article Journal of Thermal Analysis and Calorimetry ; Volume 141, Issue 5 , 2020 , Pages 2047-2059 ; Rashidi, S ; Abolfazli Esfahani, J ; Sharif University of Technology
Springer Netherlands
2020
Abstract
In this paper, a study is conducted to determine the influences of perforated anchors on heat transfer intensification of turbulence nanofluid flow in a pipe. Six different turbulence models are used, and the results obtained by these models are benchmarked with the existing theoretical data to select the best turbulence model. The outputs showed that the k–ε–RNG–scalable wall function model has higher accuracy and so it is selected to simulate this problem. The influences of various parameters including the addition of perforation on the anchors, the perforation diameter (in the range of 1–5 mm), the Re number (in the range of 5000–25,000), and the volumetric concentration of nanoparticles...
A characteristic-based numerical simulation of water-titanium dioxide nano-fluid in closed domains
, Article International Journal of Engineering, Transactions A: Basics ; Volume 33, Issue 1 , 2020 , Pages 158-163 ; Razavi, S. E ; Adibi, O ; Sharif University of Technology
Materials and Energy Research Center
2020
Abstract
A new characteristic-based method is developed and used for solving the mixed and forced convection problems. The nano-fluid flow with heat transfer is simulated with a novel characteristic-based scheme in closed domains with different aspect ratios. For this purpose, a FORTRAN code has been written and developed. Water as a pure fluid and water-titanium dioxide as a nano-fluid were considered. The governing equations are solved by the finite volume utilizing a characteristic-based scheme for the convective fluxes. The simulation is done at Grashof numbers from 100 to 104, Reynolds numbers from 100 to 1000, and volume fractions of nano-particles from 0% to 10%. Streamlines, isotherms,...
Prediction of the pressure drop for CuO/(Ethylene glycol-water) nanofluid flows in the car radiator by means of Artificial Neural Networks analysis integrated with genetic algorithm
, Article Physica A: Statistical Mechanics and its Applications ; Volume 546 , 2020 ; Ghazvini, M ; Maddah, H ; Kahani, M ; Pourfarhang, S ; Pourfarhang, A ; Zeinali Herisg, S ; Sharif University of Technology
Elsevier B.V
2020
Abstract
In this investigation, neural networks were used to predict pressure drop of CuO-based nanofluid in a car radiator. For this purpose, the neural network with the multilayer perceptron structure was used to formulate a model for estimating the pressure drop In this way, different concentrations of copper oxide-based nanofluid were prepared. The base fluid was the mixture of ethylene glycol and pure water (60:40 wt%) which usually used as the cooling fluid in automotive industries. The prepared nanofluid samples were used in a car radiator and the pressure drop of nanofluid flows in the system at different Reynolds were measured. The main purpose of this study was developing the optimized...