Pub Date : 2024-08-08DOI: 10.1177/23977914241263460
Pungja Mushahary, P. Vanengmawia, Surender Ontela
The paper presents the analysis of the mixed convective magnetohydrodynamic (MHD) flow of reactive couple stress hybrid nanofluid with temperature-dependent thermophysical properties in a porous vertical channel. The considered hybrid nanofluid is produced by mixing multi-walled carbon nanotubes ( MWCNT) and silver ([Formula: see text]) nanoparticles in base fluid ethylene glycol ([Formula: see text]) considering the base fluid and the nanoparticles in a thermal equilibrium state. The effect of the magnetic field is considered transverse to the channel walls having constant temperatures. The momentum and energy equations that govern the system are defined using the Darcy-Forchheimer model and are non-nondimensionalized applying relevant dimensionless parameters and solved using the homotopy analysis method (HAM). To analyze the irreversibilities in the system, entropy generation, and the Bejan numbers are defined. Different significant physical parameters arising in the system are considered for the analysis and its effects are scrutinized on the velocity and temperature profiles along with entropy generation. The results show that the velocity and temperature develop in the system with rising variable viscosity and thermal conductivity parameters, and Darcy number whereas it degrades with rising nanoparticle concentration. The rate of entropy generation develops with rising variable viscosity and thermal conductivity parameters and Darcy number whereas it degrades with higher nanoparticles concentration.
{"title":"Entropy generation analysis of mixed-convective flow of magnetohydrodynamic reactive couple stress MWCNT-Ag/C2H6O2 hybrid nanofluid with variable properties in a porous vertical channel","authors":"Pungja Mushahary, P. Vanengmawia, Surender Ontela","doi":"10.1177/23977914241263460","DOIUrl":"https://doi.org/10.1177/23977914241263460","url":null,"abstract":"The paper presents the analysis of the mixed convective magnetohydrodynamic (MHD) flow of reactive couple stress hybrid nanofluid with temperature-dependent thermophysical properties in a porous vertical channel. The considered hybrid nanofluid is produced by mixing multi-walled carbon nanotubes ( MWCNT) and silver ([Formula: see text]) nanoparticles in base fluid ethylene glycol ([Formula: see text]) considering the base fluid and the nanoparticles in a thermal equilibrium state. The effect of the magnetic field is considered transverse to the channel walls having constant temperatures. The momentum and energy equations that govern the system are defined using the Darcy-Forchheimer model and are non-nondimensionalized applying relevant dimensionless parameters and solved using the homotopy analysis method (HAM). To analyze the irreversibilities in the system, entropy generation, and the Bejan numbers are defined. Different significant physical parameters arising in the system are considered for the analysis and its effects are scrutinized on the velocity and temperature profiles along with entropy generation. The results show that the velocity and temperature develop in the system with rising variable viscosity and thermal conductivity parameters, and Darcy number whereas it degrades with rising nanoparticle concentration. The rate of entropy generation develops with rising variable viscosity and thermal conductivity parameters and Darcy number whereas it degrades with higher nanoparticles concentration.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"15 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-27DOI: 10.1177/23977914241263453
Mohd Bilal Naim Shaikh, Andreas Rosenkranz, Mohammed Ali, Syed Afzal Ahmad
Sustainability is nowadays a global research priority, especially in machining, where optimizing production processes for increased productivity, profits, and efficiency is key. Addressing this need, the adoption of nanofluids in minimum quantity lubrication machining has surged, aligning with environmental concerns and regulatory demands. In this study, sustainable zinc oxide (ZnO) and zirconium dioxide (ZrO2) nanoparticles fabricated using plant extracts have been incorporated into conventional cutting fluids to enhance their machinability performance under minimum quantity lubrication for turning process. The microstructural analysis confirms the successful synthesis of the targeted nanoparticles with excellent purity and size distribution. The addition of nanoparticles significantly enhanced thermal conductivity from 0.5916 W/(m⋅K) for the base fluid to 0.6286 W/(m⋅K) for ZnO and to 0.6242 W/(m⋅K) for ZrO2. Further, nanofluids exhibited an increased dynamic viscosity, 1.435 mPa.s for ZrO2 and 1.125 mPa.s for ZnO as compare to 0.7644 mPa.s of base fluid, attributed to the nanoparticle confinement effect whereas contact angle measurements indicated an improved wettability for all nanofluids. Machining experiments validate the efficacy of nanofluids, demonstrating reduced cutting temperatures and enhanced surface finish. Notably, ZrO2-based nanofluids exhibit improved tribological response, while ZnO-based nanofluids showcase exceptional heat transfer ability, offering promising solutions to key technical challenges in machining processes. In conclusion, this study underscores the potential of green, sustainable ZnO and ZrO2 nanoparticles as additives in cutting fluids, poised to revolutionize metalworking and manufacturing processes, thereby enhancing product quality and sustainability.
{"title":"Improving the performance of cutting fluids by using ZnO and ZrO2 nanoparticles","authors":"Mohd Bilal Naim Shaikh, Andreas Rosenkranz, Mohammed Ali, Syed Afzal Ahmad","doi":"10.1177/23977914241263453","DOIUrl":"https://doi.org/10.1177/23977914241263453","url":null,"abstract":"Sustainability is nowadays a global research priority, especially in machining, where optimizing production processes for increased productivity, profits, and efficiency is key. Addressing this need, the adoption of nanofluids in minimum quantity lubrication machining has surged, aligning with environmental concerns and regulatory demands. In this study, sustainable zinc oxide (ZnO) and zirconium dioxide (ZrO2) nanoparticles fabricated using plant extracts have been incorporated into conventional cutting fluids to enhance their machinability performance under minimum quantity lubrication for turning process. The microstructural analysis confirms the successful synthesis of the targeted nanoparticles with excellent purity and size distribution. The addition of nanoparticles significantly enhanced thermal conductivity from 0.5916 W/(m⋅K) for the base fluid to 0.6286 W/(m⋅K) for ZnO and to 0.6242 W/(m⋅K) for ZrO2. Further, nanofluids exhibited an increased dynamic viscosity, 1.435 mPa.s for ZrO2 and 1.125 mPa.s for ZnO as compare to 0.7644 mPa.s of base fluid, attributed to the nanoparticle confinement effect whereas contact angle measurements indicated an improved wettability for all nanofluids. Machining experiments validate the efficacy of nanofluids, demonstrating reduced cutting temperatures and enhanced surface finish. Notably, ZrO2-based nanofluids exhibit improved tribological response, while ZnO-based nanofluids showcase exceptional heat transfer ability, offering promising solutions to key technical challenges in machining processes. In conclusion, this study underscores the potential of green, sustainable ZnO and ZrO2 nanoparticles as additives in cutting fluids, poised to revolutionize metalworking and manufacturing processes, thereby enhancing product quality and sustainability.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"92 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141797796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-25DOI: 10.1177/23977914241259332
Seyed Hamed Mirmahdi, M. Javanbakht
In this paper, effect of the external surface layer on low pressure phase (LPP)-high pressure phase (HPP) transformation in a single crystal is investigated using a phase field model. It consists of a kinetic equation to represent the LPP-HPP transformation and another one to introduce the external surface layer between the bulk and surrounding phase within which the surface energy is properly distributed. After resolving a stationary layer, the coupled elasticity and phase field equations are solved to capture the HHP evolution. The variation of the critical thermal driving force ([Formula: see text]) versus the ratio of the external surface layer width to the HPP-LPP interface width ([Formula: see text]) is found for different boundary conditions, uniaxial pressures and transformation strains. The external surface layer reveals a similar nonlinear increase of [Formula: see text] versus [Formula: see text], in agreement with previous numerical and experimental data on thermal induced transformation/melting at the nanoscale. Without vertical constraint, [Formula: see text] nonlinearly increases versus [Formula: see text] and remains constant for [Formula: see text]. It also linearly reduces versus the pressure/transformation strain, independent of [Formula: see text]. With vertical constraint, [Formula: see text] is larger and weakly dependent on [Formula: see text]. Under applied pressure, the transformation work linearly increases with the transformation strain for [Formula: see text] and consequently, [Formula: see text] reduces. The obtained results help to understand the effect of the external surface layer on the HPP evolution in relation to other key parameters depending on its width.
{"title":"Investigating the effect of external surface layer on high pressure phase evolution in a single crystal: A mechanics-based phase field study","authors":"Seyed Hamed Mirmahdi, M. Javanbakht","doi":"10.1177/23977914241259332","DOIUrl":"https://doi.org/10.1177/23977914241259332","url":null,"abstract":"In this paper, effect of the external surface layer on low pressure phase (LPP)-high pressure phase (HPP) transformation in a single crystal is investigated using a phase field model. It consists of a kinetic equation to represent the LPP-HPP transformation and another one to introduce the external surface layer between the bulk and surrounding phase within which the surface energy is properly distributed. After resolving a stationary layer, the coupled elasticity and phase field equations are solved to capture the HHP evolution. The variation of the critical thermal driving force ([Formula: see text]) versus the ratio of the external surface layer width to the HPP-LPP interface width ([Formula: see text]) is found for different boundary conditions, uniaxial pressures and transformation strains. The external surface layer reveals a similar nonlinear increase of [Formula: see text] versus [Formula: see text], in agreement with previous numerical and experimental data on thermal induced transformation/melting at the nanoscale. Without vertical constraint, [Formula: see text] nonlinearly increases versus [Formula: see text] and remains constant for [Formula: see text]. It also linearly reduces versus the pressure/transformation strain, independent of [Formula: see text]. With vertical constraint, [Formula: see text] is larger and weakly dependent on [Formula: see text]. Under applied pressure, the transformation work linearly increases with the transformation strain for [Formula: see text] and consequently, [Formula: see text] reduces. The obtained results help to understand the effect of the external surface layer on the HPP evolution in relation to other key parameters depending on its width.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"27 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141806040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-25DOI: 10.1177/23977914241259815
O. A. Bég, Debasis Kumar, M. J. Uddin, Md Abdul Alim, T. Bég
The phenomenon of bioconvecton due to motile microorganism swimming patterns has been found to be a beneficial mechanism in many biological processes and microdevices. Inducing convective transport in self-propelling microbes has been successfully used to enhance mixing, reaction propensity and concentration transport within a range of engineered devices. Doping materials with microorganisms can also be implemented to manipulate magnetohydrodynamic coating processes with smart functional liquids, in which the substrate may be planar, wedge-shaped, curved etc. Inspired by this application, the current article examines theoretically and numerically the external boundary layer Falkner-Skan flow of an electroconductive nanofluid containing gyrotactic micro-organisms on a two-dimensional wedge with Stefan blowing and different slip effects at the wedge boundary. The physico-mathematical model is formulated using a system of partial differential equations and appropriate boundary conditions which are then transformed to a system of ordinary differential equations with appropriate similarity variables. The non-dimensional boundary value problem is solved numerically with the aid of the Mathematica software solver package named “NDSolve.” The impacts of the Stefan blowing, velocity, thermal, nanoparticle concentration and microorganism slips, magnetic number, Lewis number, bioconvection Lewis number, the Falkner-Skan wedge parameter, bioconvection Péclet number, thermophoresis and Brownian motion on key transport characteristics that is, dimensionless velocity, temperature, nanoparticle concentration (volume fraction), microorganism concentration, skin friction coefficient, local heat transfer rate (local Nusselt number), local mass transfer rate (local Sherwood number), and the microorganism local density number gradient are computed and visualized graphically. Numerical solutions are validated with previous literature. The outcomes reported in this paper are relevant to the synthesis of functional bio-nanopolymers.
{"title":"Simulation of magneto-nano-bioconvective coating flow with blowing and multiple slip effects","authors":"O. A. Bég, Debasis Kumar, M. J. Uddin, Md Abdul Alim, T. Bég","doi":"10.1177/23977914241259815","DOIUrl":"https://doi.org/10.1177/23977914241259815","url":null,"abstract":"The phenomenon of bioconvecton due to motile microorganism swimming patterns has been found to be a beneficial mechanism in many biological processes and microdevices. Inducing convective transport in self-propelling microbes has been successfully used to enhance mixing, reaction propensity and concentration transport within a range of engineered devices. Doping materials with microorganisms can also be implemented to manipulate magnetohydrodynamic coating processes with smart functional liquids, in which the substrate may be planar, wedge-shaped, curved etc. Inspired by this application, the current article examines theoretically and numerically the external boundary layer Falkner-Skan flow of an electroconductive nanofluid containing gyrotactic micro-organisms on a two-dimensional wedge with Stefan blowing and different slip effects at the wedge boundary. The physico-mathematical model is formulated using a system of partial differential equations and appropriate boundary conditions which are then transformed to a system of ordinary differential equations with appropriate similarity variables. The non-dimensional boundary value problem is solved numerically with the aid of the Mathematica software solver package named “NDSolve.” The impacts of the Stefan blowing, velocity, thermal, nanoparticle concentration and microorganism slips, magnetic number, Lewis number, bioconvection Lewis number, the Falkner-Skan wedge parameter, bioconvection Péclet number, thermophoresis and Brownian motion on key transport characteristics that is, dimensionless velocity, temperature, nanoparticle concentration (volume fraction), microorganism concentration, skin friction coefficient, local heat transfer rate (local Nusselt number), local mass transfer rate (local Sherwood number), and the microorganism local density number gradient are computed and visualized graphically. Numerical solutions are validated with previous literature. The outcomes reported in this paper are relevant to the synthesis of functional bio-nanopolymers.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"43 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141803876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-23DOI: 10.1177/23977914241259087
K. Ganesh Kumar, DG Prakasha, MM Praveen, M. Gnaneswara Reddy, K.R. Vasanth
The primary purpose of this paper is to investigate the flow and thermal properties of a continuously stretching sheet. To determine temperature, variable thermal conductivity is also encountered. Furthermore, the flow problem considers the convective circumstances of heat and mass transfer. By lowering the number of independent components, the governing equations are reduced into non-dimensional types, which are then numerically solved using the RKF-4 method and shooting methodology. A visualization evaluation of the entangled flow properties is done for velocity concentration and temperature distributions. It is found that the fluid concentration is discovered to be more significant in the [Formula: see text] case, followed by the [Formula: see text] and [Formula: see text] cases. Furthermore, the efficiency of the [Formula: see text] the [Formula: see text] parameter’s shifting values control field.
{"title":"Physical characteristics of variable thermal conductivity and MHD flow across a continually stretched sheet","authors":"K. Ganesh Kumar, DG Prakasha, MM Praveen, M. Gnaneswara Reddy, K.R. Vasanth","doi":"10.1177/23977914241259087","DOIUrl":"https://doi.org/10.1177/23977914241259087","url":null,"abstract":"The primary purpose of this paper is to investigate the flow and thermal properties of a continuously stretching sheet. To determine temperature, variable thermal conductivity is also encountered. Furthermore, the flow problem considers the convective circumstances of heat and mass transfer. By lowering the number of independent components, the governing equations are reduced into non-dimensional types, which are then numerically solved using the RKF-4 method and shooting methodology. A visualization evaluation of the entangled flow properties is done for velocity concentration and temperature distributions. It is found that the fluid concentration is discovered to be more significant in the [Formula: see text] case, followed by the [Formula: see text] and [Formula: see text] cases. Furthermore, the efficiency of the [Formula: see text] the [Formula: see text] parameter’s shifting values control field.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"113 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141811929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-10DOI: 10.1177/23977914241259084
Ardhani Satya Bhanu Prasanna, Koona Ramji
This study focuses on investigating the effects of surface modification on the stability and thermal conductivity of ethylene glycol dispersed with aluminium oxide (Al2O3) nanoparticles. Aluminium oxide (Al2O3) nanoparticles were dispersed in ethylene glycol after surface modification with the surfactant Cetrimonium bromide (CTAB) at concentrations of 1, 0.5, 0.25 and 0.125 mass percent. The thermal conductivity and dynamic viscosity at various concentrations were evaluated in the temperature range from 20°C to 170°C, in contrast to prior studies in which the properties were determined in the range from 20°C to 60°C. The stability of the suspension dispersed with CTAB proved to be excellent, and the nanofluids remained stable for one month due to its excellent electrostatic interaction with the surface of Al2O3 nanoparticles. The addition of Al2O3 nanoparticles to ethylene glycol led to a significant improvement in thermal conductivity, which is between 15% and 25%. The influence of the surfactant is clear from the results, and it shows that CTAB is the most suitable surfactant for metal oxide nanoparticles. The experimental data are compared with the data available in the literature in the temperature range from 30°C to 60°C and are found to be in good agreement.
{"title":"Effect of surface modification on the thermophysical properties of ethylene glycol dispersed with Al2O3 nanoparticles for solar thermal applications","authors":"Ardhani Satya Bhanu Prasanna, Koona Ramji","doi":"10.1177/23977914241259084","DOIUrl":"https://doi.org/10.1177/23977914241259084","url":null,"abstract":"This study focuses on investigating the effects of surface modification on the stability and thermal conductivity of ethylene glycol dispersed with aluminium oxide (Al2O3) nanoparticles. Aluminium oxide (Al2O3) nanoparticles were dispersed in ethylene glycol after surface modification with the surfactant Cetrimonium bromide (CTAB) at concentrations of 1, 0.5, 0.25 and 0.125 mass percent. The thermal conductivity and dynamic viscosity at various concentrations were evaluated in the temperature range from 20°C to 170°C, in contrast to prior studies in which the properties were determined in the range from 20°C to 60°C. The stability of the suspension dispersed with CTAB proved to be excellent, and the nanofluids remained stable for one month due to its excellent electrostatic interaction with the surface of Al2O3 nanoparticles. The addition of Al2O3 nanoparticles to ethylene glycol led to a significant improvement in thermal conductivity, which is between 15% and 25%. The influence of the surfactant is clear from the results, and it shows that CTAB is the most suitable surfactant for metal oxide nanoparticles. The experimental data are compared with the data available in the literature in the temperature range from 30°C to 60°C and are found to be in good agreement.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":" 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141363541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-21DOI: 10.1177/23977914241248558
Sadique Rehman, Rujda Parveen, W. Jamshed, M. Prakash, Rabha W Ibrahim, Mohamed R. Eid, Syed M. Hussain, H. Ahmad
The current study investigates two-dimensional natural convective heat transference and entropy production in a tilted wavy-walled enclosure under the magnetic field and thermal radiation effect. The enclosure is filled with Cu–Al2O3/H2O hybrid nanofluid and subjected to a non-uniformly heated curved left wall, constant cold right curved side, uniformly heated bottom side, and insulated upper side. The regulating formulas in the non-dimensional form are reduced to streaming function-velocity expression and are numerically solved based on the Bi-CGStab method. The simulations are behaved with diverse Rayleigh amounts, Hartmann numbers, an incline angle of the enclosure, radiation parameters, diverse amplitude of the curved wall, and volume fraction of hybrid nanoparticles. Numerical code validation with other published results agrees well with the present outcomes. Heat and entropy generation were improved with the change in dimensionless parameters, and the findings have been clarified through discussion. The observations indicate that the Rayleigh numbers, nanoparticle fractional size, amplitude, and radiation parameter influence the convective effect and entropy production inside the enclosure. In contrast, the Hartmann number detracts from the convective effect. The findings suggest that a rise in the cavity angle may result in a corresponding boost or decline in heat transference. The minimum Nusselt numbers is obtained at [Formula: see text], as the angle of incline of the enclosure restraints the fluid rapidity and diminishes the heat transference rates. To design heat exchangers, this particular study may serve as a guide.
{"title":"Numerical simulation and entropy optimization of hybrid nanofluid flow in an inclined wavy enclosure subjected to thermal radiation","authors":"Sadique Rehman, Rujda Parveen, W. Jamshed, M. Prakash, Rabha W Ibrahim, Mohamed R. Eid, Syed M. Hussain, H. Ahmad","doi":"10.1177/23977914241248558","DOIUrl":"https://doi.org/10.1177/23977914241248558","url":null,"abstract":"The current study investigates two-dimensional natural convective heat transference and entropy production in a tilted wavy-walled enclosure under the magnetic field and thermal radiation effect. The enclosure is filled with Cu–Al2O3/H2O hybrid nanofluid and subjected to a non-uniformly heated curved left wall, constant cold right curved side, uniformly heated bottom side, and insulated upper side. The regulating formulas in the non-dimensional form are reduced to streaming function-velocity expression and are numerically solved based on the Bi-CGStab method. The simulations are behaved with diverse Rayleigh amounts, Hartmann numbers, an incline angle of the enclosure, radiation parameters, diverse amplitude of the curved wall, and volume fraction of hybrid nanoparticles. Numerical code validation with other published results agrees well with the present outcomes. Heat and entropy generation were improved with the change in dimensionless parameters, and the findings have been clarified through discussion. The observations indicate that the Rayleigh numbers, nanoparticle fractional size, amplitude, and radiation parameter influence the convective effect and entropy production inside the enclosure. In contrast, the Hartmann number detracts from the convective effect. The findings suggest that a rise in the cavity angle may result in a corresponding boost or decline in heat transference. The minimum Nusselt numbers is obtained at [Formula: see text], as the angle of incline of the enclosure restraints the fluid rapidity and diminishes the heat transference rates. To design heat exchangers, this particular study may serve as a guide.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"18 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141118744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-17DOI: 10.1177/23977914241248550
Muhammad Omar, Gosikere Kenchappa Ramesh, Usman Abbas, M. N. Bashir, S. A. Shehzad
This research is conducted by considering the Darcy–Forchheimer viscoelastic non-Newtonian fluids (NNF) generated by the movement of surface. Two types NNF namely Walter’s liquid B (WLB) and second grade (SG) fluids are chosen as the working fluids. Cattaneo–Christov energy diffusion model is carried out for the energy transmission analysis. Newtonian heating (NH) and Newtonian concentration (NC) conditions are imposed for the solutal and thermal analysis. The model is formulated by the application of boundary layer technique. These equations are converted into non dimensional model by the implication of similarity variables. The numeric solutions are executed by the utilization of Runge–Kutta–Fehlberg-45 order scheme. The results are presented by numeric benchmarks and graphical illustrations. A comparative discussion of WLB and SG fluids is reported. A comparative visualization shows that the higher velocity profile is achieved for SG fluid case while temperature and concentration profiles are larger in the case of SG fluid. The Brownian movement and thermophoretic constraints have similar influences on temperature. The Brownian movement constraint has reverse trends on concentration and temperature.
{"title":"Viscoelastic nanofluids flow through Darcy–Forchheimer porous media with Newtonian conditions","authors":"Muhammad Omar, Gosikere Kenchappa Ramesh, Usman Abbas, M. N. Bashir, S. A. Shehzad","doi":"10.1177/23977914241248550","DOIUrl":"https://doi.org/10.1177/23977914241248550","url":null,"abstract":"This research is conducted by considering the Darcy–Forchheimer viscoelastic non-Newtonian fluids (NNF) generated by the movement of surface. Two types NNF namely Walter’s liquid B (WLB) and second grade (SG) fluids are chosen as the working fluids. Cattaneo–Christov energy diffusion model is carried out for the energy transmission analysis. Newtonian heating (NH) and Newtonian concentration (NC) conditions are imposed for the solutal and thermal analysis. The model is formulated by the application of boundary layer technique. These equations are converted into non dimensional model by the implication of similarity variables. The numeric solutions are executed by the utilization of Runge–Kutta–Fehlberg-45 order scheme. The results are presented by numeric benchmarks and graphical illustrations. A comparative discussion of WLB and SG fluids is reported. A comparative visualization shows that the higher velocity profile is achieved for SG fluid case while temperature and concentration profiles are larger in the case of SG fluid. The Brownian movement and thermophoretic constraints have similar influences on temperature. The Brownian movement constraint has reverse trends on concentration and temperature.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140963163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-28DOI: 10.1177/23977914241231999
B. Vasu, Mustaque Hussain Borbora, O. A. Bég, R. Gorla, Jayati Tripathi, Matin Burby
In the present investigation, an analysis is carried out to study the MHD triple diffusive free thermo-solutal convection boundary layer flow of an electro-conductive nanofluid flow over a vertical stretching sheet. This problem is relevant to magnetic nanomaterials fabrication operations in which multiple species in addition to nanoparticles are present. In addition to the nanoparticle diffusion, two different salts (species) having different properties are considered. A variable magnetic field is applied transverse to the vertical sheet. It is assumed that the surface is in contact with the hot magnetic nanofluid at a temperature which provides a variable heat transfer coefficient. Buongiorno’s model is employed for the nanofluid. It is also assumed that the Oberbeck-Boussinesq approximation is valid and the mixture of nanofluid and salts is homogenous and is in local thermal equilibrium. In addition, the thermal energy equation features cross-diffusion (Soret and Dufour) terms for both components of salts having different concentration. Appropriate similarity transformations are deployed to render the model non-dimensional. The emerging transformed dimensionless non-linear non-dimensional ordinary differential boundary value problem is solved with the robust bvp4c method in MATLAB. Validation with previous studies has been included for special cases of the general model. The simulations show that the addition of nanoparticles and salts, strongly modifies Temperature and nanoparticle and salt 1 and 2 concentrations. With stronger magnetic field the velocity is suppressed as is momentum boundary layer thickness whereas temperatures are boosted.
{"title":"Triple diffusive free magneto-convection of electro-conductive nanofluid from a vertical stretching sheet","authors":"B. Vasu, Mustaque Hussain Borbora, O. A. Bég, R. Gorla, Jayati Tripathi, Matin Burby","doi":"10.1177/23977914241231999","DOIUrl":"https://doi.org/10.1177/23977914241231999","url":null,"abstract":"In the present investigation, an analysis is carried out to study the MHD triple diffusive free thermo-solutal convection boundary layer flow of an electro-conductive nanofluid flow over a vertical stretching sheet. This problem is relevant to magnetic nanomaterials fabrication operations in which multiple species in addition to nanoparticles are present. In addition to the nanoparticle diffusion, two different salts (species) having different properties are considered. A variable magnetic field is applied transverse to the vertical sheet. It is assumed that the surface is in contact with the hot magnetic nanofluid at a temperature which provides a variable heat transfer coefficient. Buongiorno’s model is employed for the nanofluid. It is also assumed that the Oberbeck-Boussinesq approximation is valid and the mixture of nanofluid and salts is homogenous and is in local thermal equilibrium. In addition, the thermal energy equation features cross-diffusion (Soret and Dufour) terms for both components of salts having different concentration. Appropriate similarity transformations are deployed to render the model non-dimensional. The emerging transformed dimensionless non-linear non-dimensional ordinary differential boundary value problem is solved with the robust bvp4c method in MATLAB. Validation with previous studies has been included for special cases of the general model. The simulations show that the addition of nanoparticles and salts, strongly modifies Temperature and nanoparticle and salt 1 and 2 concentrations. With stronger magnetic field the velocity is suppressed as is momentum boundary layer thickness whereas temperatures are boosted.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"312 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140417901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-25DOI: 10.1177/23977914241232162
S. Ramprakaash, K. Muralidharan, R. Vaira Vignesh, R. Senthil Kumar, M. Govindaraju, A. Baghad
This research work focuses on the performance characteristics of the standard SAE20W40 lubricant with the addition of nanoparticles (aluminum oxide (Al2O3) and silicon dioxide (SiO2) in equal proportion). The nanoparticles were surface-activated using oleic acid to homogenize the lubricant dispersion. The lubricant was added with 0.1, 0.3, and 0.5 wt% of nanoparticles and subjected to a mechano-thermal process to synthesize nanolubricant. The physio-chemical properties (flash point, fire point, thermal stability, kinematic viscosity, acid value, and iodine value) and tribological characteristics (specific wear rate, friction coefficient, and wear mechanism) of the nanolubricant were determined and correlated with dispersed nanoparticles. Instrumental characterization of SEM, EDS, TEM, FT-IR, and UV-Vis tests were performed to validate the surface-activated nanolubricant. The base lubricant demonstrated favorable tribological characteristics when enhanced with 0.1 wt% additives.
{"title":"Tribological characterization of SAE20W40 lubricant added with surface activated nanoparticles (Al2O3 and SiO2)","authors":"S. Ramprakaash, K. Muralidharan, R. Vaira Vignesh, R. Senthil Kumar, M. Govindaraju, A. Baghad","doi":"10.1177/23977914241232162","DOIUrl":"https://doi.org/10.1177/23977914241232162","url":null,"abstract":"This research work focuses on the performance characteristics of the standard SAE20W40 lubricant with the addition of nanoparticles (aluminum oxide (Al2O3) and silicon dioxide (SiO2) in equal proportion). The nanoparticles were surface-activated using oleic acid to homogenize the lubricant dispersion. The lubricant was added with 0.1, 0.3, and 0.5 wt% of nanoparticles and subjected to a mechano-thermal process to synthesize nanolubricant. The physio-chemical properties (flash point, fire point, thermal stability, kinematic viscosity, acid value, and iodine value) and tribological characteristics (specific wear rate, friction coefficient, and wear mechanism) of the nanolubricant were determined and correlated with dispersed nanoparticles. Instrumental characterization of SEM, EDS, TEM, FT-IR, and UV-Vis tests were performed to validate the surface-activated nanolubricant. The base lubricant demonstrated favorable tribological characteristics when enhanced with 0.1 wt% additives.","PeriodicalId":516661,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems","volume":"8 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140432207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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