Journal of Nanofluids最新文献

{"title":"Heat Generation/Absorption in MHD Double Diffusive Mixed Convection of Different Nanofluids in a Trapezoidal Enclosure","authors":"Priyajit Mondal, T. Mahapatra, Rujda Parveen, B. Saha","doi":"10.1166/jon.2024.2116","DOIUrl":"https://doi.org/10.1166/jon.2024.2116","url":null,"abstract":"Numerical simulation of MHD double-diffusive mixed convection flow of different nanofluids in a trapezoidal enclosure is performed with an internal heat generation/absorption source inside the enclosure. The nondimensional momentum, heat and mass equations are solved numerically by\u0000 using the finite difference method. The present study focused mainly on the increment of the rate of heat and mass transfer using internal heat generation or absorption sources inside a lid-driven trapezoidal cavity. Considering numerous governing parameters (Q = −5 to 5, Ha\u0000 = 0 to 30, Ri = 0.01 to 100) the flow velosity, temperature and concentration profiles are calculated for various nanofluids. Graphs and numerical tables are utilized to examine how different physical entities affect the distribution of flow, temperature and concentration. It is noted\u0000 that enhancing values of Ha reduces the mass and heat transfer rate. It is observed that heat generation/absorption significantly affect the heat transfer rate as internal heat generation source increases heat transmission rather than mass transfer. The involvement of heat generation/absorption\u0000 source significantly affects the heat transfer rate. By considering Al2O3-water nanofluid, the solid volume percentage has an accelerating effect on the Nusselt and Sherwood numbers as compared to the other nanofluids in the study.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140756204","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}

{"title":"Nonlinear Thermal Instability in Nanoliquid Under Magnetic-Field Modulation Within Hele-Shaw Cell","authors":"S. H. Manjula, P. Kiran","doi":"10.1166/jon.2024.2109","DOIUrl":"https://doi.org/10.1166/jon.2024.2109","url":null,"abstract":"In a nanoliquid-confined Hele-Shaw cell, the effect of magnetic-modulation is investigated. The goal of this study is to conclude the work described in Rai et al. [45] for oscillatory convection. The existence of the CGLE42, 43 model is constrained by the condition ω2\u0000 > 0 and determined transfer analysis. The magnetic fluxes in Heleshaw cells are governed by CGLE and magnetic modulation limitations. Changes in magnetic modulation can affect heat and mass transfer in terms of modulation frequency and amplitude. In addition, the findings of earlier research\u0000 on heat and mass transport indicate that oscillatory mode is preferable than stationary mode. Further, the transport analysis is compared to previous research and shown to have improved results.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140769085","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}

{"title":"Three-Dimensional Magnetohydrodynamics Casson Fluid Flow Past a Non-Linearly Stretching Surface with Nanoparticles","authors":"Jima Seyoum Abera, Mitiku Daba Firdi, Ebba Hindebu Rikitu","doi":"10.1166/jon.2024.2153","DOIUrl":"https://doi.org/10.1166/jon.2024.2153","url":null,"abstract":"This article, the three-dimensional flow of a casson fluid over a non-linearly stretching surface by bilateral directions along the xy-plane under boundary layer approximation is estimated. We have considered the the effect of magnetohydrodynamics (MHD) and the condition of natural\u0000 convective over the stretching surface. Moreover, The influences of boundary condition at temperatures and nanoparticles in motion are thermophoresis, Brownian motion and radiation are considered. The method of solved equation by using the appropriate transformations, the system non-linear\u0000 partial differential equations along with the boundary conditions is transformed into coupled non-linear ordinary differential equations. The numerical solutions of the mathematics formulated equations are solved by using a Runge–Kutta method with a shooting technique. The new obtained\u0000 results are checked with previously published work for special cases of the problem in order to access the accuracy of numerical method and the convergency between are found to be in excellent agreement through ratified by tabular results. The emerging parameters behavior are discussed graphically\u0000 in the form of velocity, temperature and fraction of nanoparticles. The number of Nusselt and number of Sherwood are calculated by numerical computations solution are expressed by tabular results. We have observed that the assignment denoted by parameters characteristics have significant effect\u0000 on flow, transfer of heat and mass. Generally, The results are expressed by graphically, in tabular form and the physical aspects of the problem are determined.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140779923","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}

{"title":"A Comment on the Utility of Nanofluids: Interactive Influence of Nanoparticle Size and Amount at Varying Temperatures","authors":"M. O. Carpinlioglu, Mahmut Kaplan","doi":"10.1166/jon.2024.2154","DOIUrl":"https://doi.org/10.1166/jon.2024.2154","url":null,"abstract":"Interactive influence of nanoparticle diameter, dp and volumetric fraction, φ on major thermophysical characteristics of relative thermal conductivity, kr and dynamic viscosity, μr of nanofluids as a primary function\u0000 of temperature, T is determined to assess the utility of nanofluids. In the case study common base fluids of water (W) and ethylene glycol (EG) are used. Spherical shape Ag and Al2O3 with a selected dp range of (20–100 nm) are used in the\u0000 covered φ range of (0.25–5%). Influence of T is set by considering T = 293 K and T = 323 K. The referred data ranges are applied for the calculation of kr and μr of nanofluids Ag–W, EG and Al2O3–W,\u0000 EG in reference to a calculation procedure provided previously by the authors. The calculated magnitudes of kr and μr are expressed as a function of dp, φ and T. The results reveal that kr and μr\u0000 rise dramatically as dp decrease from 40 nm to 20 nm and φ increase from 2% to 5% at T = 293 K and T = 323 K. The calculations confirm the relevant literature that the required pumping power increase is associated with low dp and\u0000 high φ. Therefore, here exists limiting magnitudes of dp, φ as a function of T for the effective utilization of nanoparticles in base fluids. In order to generalize the fact non-dimensional parameters of Prandtl Number, Pr and Reynolds Number,\u0000 Re should be referred due to the definitions of each depend on thermophysical characteristics and the cited dp, φ and T. The calculations herein have the validity range of Re and Pr of base fluids as 0.0002–0.032 and 3.58–210.30, respectively.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140772470","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}

{"title":"Combined Effect of Non-Linear Mixed Convection, and Non-Uniform Heat Source/Sink on Casson Ternary Hybrid Nanofluid Flow Across a Stretched Rotatory Disk","authors":"Ashish Paul, Bhagyashri Patgiri, Neelav Sarma","doi":"10.1166/jon.2024.2136","DOIUrl":"https://doi.org/10.1166/jon.2024.2136","url":null,"abstract":"This present study emphasizes the importance of a specific type of fluid called a Casson ternary hybrid nanofluid. Our research explores a novel approach using the combination of several complex phenomena, including magnetohydrodynamic radiative flow, non-linear mixed convection, a\u0000 non-uniform heat source or sink, a chemical reaction described by the Arrhenius model, and multiple slip effects. The researchers transformed the system of governing equations into a set of first-order ordinary differential equations using appropriate mathematical transformations and then\u0000 solved them numerically using the bvp4c solver. The study investigated the behavior of velocity profiles, thermal dispersion, concentration dispersion, and heat and mass transfer for different values of the parameters involved. Our results indicated that the rising values of the heat transmission\u0000 rate escalated by 2.98% for Casson ternary hybrid nanofluid when compared to ternary hybrid nanofluid. Further, ternary hybrid nanofluid had a 7.49% and 6.89% higher heat transmission rate compared to the hybrid nanofluid and conventional nanofluid, respectively. Besides, the heat transmission\u0000 rate is enhanced by 17.5% and 3.11% respectively under the existence of the mixed convective and non-linear thermal convection parameters. Also, the presence of chemical reaction parameter shows a positive impact on the rate of mass transmission","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140777460","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}

{"title":"Insights Into Viscosity/Thermal Conductivity of a Micropolar Nanofluid Flow Near a Horizontal Cylinder","authors":"N. S. Elgazery, Nader Y. Abd Elazem","doi":"10.1166/jon.2024.2155","DOIUrl":"https://doi.org/10.1166/jon.2024.2155","url":null,"abstract":"The purpose of this study is examining the changes in viscosity and thermal conductivity of a micropolar nanofluid on a horizontal cylinder, specifically on the axisymmetric stagnation inflow. Nanofluid viscosity is known to exhibit an exponential change with temperature, while thermal\u0000 conductivity was found as a linear with temperature to enhance the heat transfer rates of nanofluid flow by numerical calculations. A horizontal circular cylinder with an axisymmetric stationary point was the subject of the mathematical model, which described an incompressible, constant micropolar\u0000 nanofluid flow over it. The importance of predicting heat and mass transfer for a horizontal cylinder are common in many applications, including refrigerator condensers and flat-plate solar collectors. For this reason, it is imperative to study heat and mass transfer in horizontal cylinder\u0000 geometries. Furthermore, taken into account were fluid temperature factors like nanofluid viscosity and micro-rotation viscosity. It introduced aluminum oxide nanoparticles to two common fluids: pure water and ethylene glycol. It was capable of to estimate the pressure gradient profiles, temperature\u0000 gradient profiles, shear stress, Nusselt number, angular and azimuthal velocities, and curvature parameters for various numerical values of micropolar, variable viscosity/thermal conductivity, and curvature. An exact match is found in a table that contrasts the current numerical computation\u0000 with the published data. Based on our simulation results, it seems that the temperature profile variation for both pure water with alumina nanoparticles and ethylene glycol is significantly influenced by the Reynolds number and the viscosity/thermal conductivity characteristics of the nanofluid.\u0000 Nevertheless, the micropolar parameter barely makes a difference. Furthermore, the concavity of the pressure profiles is pushed upwards, and it appears that the pressure biographies for ethylene glycol are more pressure-intensive than those for pure water. By increasing the value of the variable\u0000 viscosity parameter of the nanofluids, it can be achieved to discern clearly between the angular velocity profiles in the two scenarios. Engineers and researchers working on propulsion technology for missiles, airplanes, and spacecraft can especially benefit from these perceptions.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140779105","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}

{"title":"Nonlinear Convection Flow of a Micropolar Nanofluid Past a Stretching Sphere with Convective Heat Transfer","authors":"W. Ibrahim, Gadisa Kenea","doi":"10.1166/jon.2024.2120","DOIUrl":"https://doi.org/10.1166/jon.2024.2120","url":null,"abstract":"An incompressible, steady combined nonlinear convective transport system on a micropolar nanofluid through a stretching sphere with convective heat transfer was investigated. The conservation equations corresponding to momentum, microrotation, thermal energy, and concentration particles\u0000 have been formulated with suitable boundary constraints. By using the required non-dimensional variables, the conservation equations have been turned into a set of high-order standard differential equations. Then, an implicit finite difference method, also known as the Keller-Box Method (KBM),\u0000 was used to numerically solve the flow problem. The obtained outcomes are displayed through graphs and tables to explain the impact of various governing variables over velocity, temperature, concentration, number of skin friction, wall coupled stress, Nusselt number, and Sherwood number. The\u0000 findings demonstrate that increasing the convective heat parameter Bi enhances the factor of skin friction, local Nusselt number, Sherwood number, velocity field, and temperature profile while lowering the wall-coupled stress. It is observed that for high values of the material parameter\u0000 β, the fluid velocity and the spin of the micro-elements both increase, which causes the dynamic viscosity and microrotation velocity to decrease. In addition, as the rates of magnetic constant Ma, thermophoresis Nt and Brownian movement Nb rise, the thermal distribution and its\u0000 thickness of boundary layer increase. However, it decline along the enlarging quantities of nonlinear convection parameter λ, Prandtl number Pr, material parameter β, and solutal Grashof number Gm, which agrees to increase fluid density. When the range\u0000 of thermophoresis Nt surges, it causes an increment in the nanoparticle species, but the opposite behavior have seen in the case of Brownian number Nb, and Lewis number Le. The comparison made with the related published paper achieves a significant agreement. The numerical result\u0000 is generated through the implementation of the computational software MATLAB R2023a.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140784638","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}

{"title":"Numerical Investigation of Hybrid Nanofluid Natural Convection and Entropy Generation in a Corrugated Enclosure with an Inner Conducting Block","authors":"Mandira Samadder, R. K. Ray","doi":"10.1166/jon.2024.2156","DOIUrl":"https://doi.org/10.1166/jon.2024.2156","url":null,"abstract":"Current work deals with a numerical analysis of convective heat transfer and entropy generation inside a rectangular cavity with a corrugated bottom filled with MoS2–SiO2-water hybrid nanofluid. Here, a conducting solid body is attached to the top wall, and\u0000 discrete heaters are attached to the bottom wall of the cavity. The numerical solutions of the governing equations are derived utilizing a higher-order compact (HOC) finite difference scheme and validated with the existing computational and experimental results. Present numerical results are\u0000 then studied in detail, emphasizing isotherms, streamlines, and local entropy generation with respect to specific parameters like Rayleigh number (103 ≤ Ra ≤ 106), the volume percentage of nanoparticles (0% ≤ Φ ≤ 4%), the thermal conductivity\u0000 of solid body (1.95 ≤ ks ≤ 16.00) as well as the aspect ratio of heater length (AR = 0.2, 0.4, 0.6, 0.8). The impacts of key factors on the Bejan number, average Nusselt number, and overall entropy generation are also investigated. The results show that an increase\u0000 in the thermal conductivity of the solid body from 1.95 to 16.00 increases the average Nusselt number and total entropy generation by 9.17% and 40.07%, respectively, for AR = 0.2, Ra = 106, and Φ = 4%. In addition, the average Nusselt number and total entropy\u0000 generation decrease by 59.11% and 61.99%, respectively, for ks = 16.00, Ra = 106, and Φ = 4% when the aspect ratio of heater length increases to 0.8.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140757295","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}

{"title":"Unsteady Natural Convection of Dusty Hybrid Nanofluid Flow Between a Wavy and Circular Cylinder with Heat Generation","authors":"Neloy Paul, L. Saha, N. C. Roy","doi":"10.1166/jon.2024.2108","DOIUrl":"https://doi.org/10.1166/jon.2024.2108","url":null,"abstract":"This work investigates the flow of two-phase dusty unsteady natural convection of water-based hybrid nanofluid (HNF) in a wavy cylinder with internal heat generation. The equations are changed using coordinate transformations to construct the problem’s physical domain after that\u0000 the resulting equations are solved using the finite difference method. Higher Rayleigh number and volume fraction of nanoparticles boost the vortex and the heat transfer. On the other hand, the heat generation parameter enhances the heat within the enclosure. Eventually, generated heat surpasses\u0000 the temperature of the hot wall and decreases the rate of heat transfer from the inner wall. About a 16.39% increment in the average Nusselt number is observed at the hot wall for 6% HNF when undulations are five, and about 92.79% increment is found when the density ratio is 1000. This study\u0000 can predict two-dimensional flow patterns; however, the model is only reliable for modest density fluctuations and constant thermo-physical parameters. The impact of dust particles in natural convection within a wavy enclosure is little known, therefore, the current investigation is to analyze\u0000 the effects of dust particles and internal heat generation of a hybrid nanofluid’s flow in a wavy enclosure. Here, Cu–Al2O3/water hybrid nanofluid is used as the working fluid because of low cost, availability of the materials, and easy process of preparation.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140760528","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}

{"title":"A Comparative Study of Newtonian and Non-Newtonian Nanofluids with Variable Thermal Conductivity Over a 3-D Stretching Surface","authors":"C. Manoj Kumar, A. Jasmine Benazir","doi":"10.1166/jon.2024.2141","DOIUrl":"https://doi.org/10.1166/jon.2024.2141","url":null,"abstract":"This study presents a comprehensive numerical and statistical analysis of the flow, heat/mass transfer management of Newtonian and non-Newtonian nanofluid over a bidirectional Darcy-Forchheimer stretching sheet. The external effects of MHD, Joule heating, thermal radiation, heat generation/absorption,\u0000 Brownian motion, thermal diffusion and chemical reaction are taken into account. It is presumed that the thermal conductivity of fluid varies linearly with temperature. The non-linear coupled P.D.Es are converted into nonlinear coupled O.D.Es using similarity transformation. These equations\u0000 are solved using MATLAB by implementing four-stage Lobatto IIIa formula and the outcomes of numerous flow parameters are presented graphically. In addition to numerical investigations, a comprehensive statistical analysis is performed using R-software to evaluate the sensitivity of key input\u0000 parameters towards variable thermal conductivity. The values of local wall friction, local wall heat flux, and wall mass flux for various parameters are tabulated. The study reveals that the heat transmission is significant for dilatant fluids (156.8%) when compared to the pseudoplastic fluids\u0000 (113.8%). Enriching the values of the Brownian motion parameter suppresses the molecular diffusion while a contrary nature is observed for the thermal diffusion parameter. Further, the mass transfer coefficient shows a very strong negative correlation with variable thermal conductivity parameter\u0000 for Shear thinning fluids, whereas for Newtonian and Shear thickening fluids it shows a very strong positive correlation.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140767151","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}