Sharif University of TechnologyScientia Iranica1026-3098321320250801Numerical investigation of the heat transfer and peristaltic flow through an asymmetric channel having variable viscosity and electric conductivity2419310.24200/sci.2023.60404.6783ENJamil AbbasHaiderAbdus Salam School of Mathematical Sciences, Government College University, Lahore, Pakistan.SanaGulAbdus Salam School of Mathematical Sciences, Government College University, Lahore, Pakistan.SohailNadeemDepartment of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan.Department of Mathematics, Wenzhou University, Wenzhou, P.R. China.0000-0002-1052-011XJournal Article20220512The peristaltic flow of nanofluids is a topic of growing interest in fluid dynamics. This study investigates the effect of temperature-dependent viscosity and electric conductivity on the peristaltic flow of nanofluids. The mathematical model of the peristaltic flow is developed using the governing equations of continuity, momentum, and energy for a Newtonian fluid. Large wavelength and small Reynolds number (Re) assumptions are used to study peristaltic flow to simplify the equations of continuity, momentum, and energy. In this article, the nanofluids are assumed to be electrically conducting and temperature dependent, and the effects of Hartman number (Ha) and Eckert number (Ec) is studied. The resulting equations are solved using the Shooting Method. The results show that the temperature-dependent viscosity and electric conductivity significantly affect the peristaltic flow of nanofluids. The flow rate and pressure gradient decrease with increasing viscosity and conductivity while the temperature and heat transfer rate increase. Moreover, the nanofluid concentration and particle size significantly impact the flow characteristics. In conclusion, this study comprehensively analyses the peristaltic flow of nanofluids with temperature-dependent viscosity and electric conductivity. The results can be useful for understanding the behavior of nanofluids in various applications, such as drug delivery systems, microfluidics, and thermal management.https://scientiairanica.sharif.edu/article_24193_a9a0a216c9719b954ac87a8f4426de4b.pdfSharif University of TechnologyScientia Iranica1026-3098321320250801Diffusions of nanoparticles and existence of multiple solutions for Magnetohydrodynamics Williamson nanofluid with slip mechanism2419510.24200/sci.2024.63355.8353ENAamirHamidDepartment of Mathematics, Women University of Azad Jammu and Kashmir, Bagh, Azad Kashmir, Pakistan.TaseerMuhammadDepartment of Mathematics, College of Science, King Khalid University, Abha, Saudi Arabia.MuhammadIrfanDepartment of Computer Science, Bahria University, Islamabad Pakistan.Journal Article20231018Here the concept of heat transport mechanisms and stagnation point of the MHD Williamson nanofluid have been elaborated with Brownian motion and thermophoresis diffusion past a permeable stretching/shrinking cylinder. Both the conditions of velocity slip and heat source/sink effects are considered. The shooting algorithm with Runge-Kutta-Fehlberg method has been exploited for solutions of ODEs. The effect on drag coefficient, heat and mass transport rates as well as the dimensionless velocity, temperature and concentration fields of the physical boundaries objectives of the study are graphically delineated and thoroughly discussed. As nanoparticle concentration increases at the outer surface of the boundary layer, the rising patterns of Nusselt number as well as skin friction are observed. Dual solutions with the critical value of the mass transfer parameter (0<s_c<s)and the shrinking parameter (χ_c<χ) are obtained for different related parameters in some domains and shrinking parameter. It's worth mentioning that just for the contracting scenario; there are a range of solutions. The slip factor increases the thermal transport amount at the surface of the shrinking cylinder. Here the outcomes noted the average increase of skin friction with respect to γ (curvature) factor to 24.8% with brilliant results compared with former prose....https://scientiairanica.sharif.edu/article_24195_c1ef3ad7be128ad4969110639a741f23.pdfSharif University of TechnologyScientia Iranica1026-3098321320250801The effect of silica mass ratio on pore structure and magnetic characteristics of Fe3O4@SiO2 core-shell nanoparticles2419710.24200/sci.2024.61855.7524ENMunasirNasirDepartment of Physics, Faculty of Mathematics and Sciences, Universitas Negeri Surabaya (Unesa), Surabaya-Indonesia.LydiaRohmawatiDepartment of Physics, Faculty of Mathematics and Sciences, Universitas Negeri Surabaya (Unesa), Surabaya-Indonesia.NuhaaFaaizatunnisaDepartment of Chemistry, FSAD, Institut Teknologi Sepuluh Nopember (ITS), Surabaya, Indonesia.AhmadTaufiqDepartment of Physics, Universitas Negeri Malang (UM), Malang, Indonesia.Journal Article20230206The fabrication of Fe3O4@SiO2 core-shell was prepared from natural iron sand as Fe3O4 core resource and in situ SiO2-coating method. Fe3O4@SiO2 was synthesized via an ultrasonic route with various ratios of Tetra-Ethyl Ortho-Silicate (TEOS) to evaluate the morphological, pore structure, and magnetic properties of the core-shell. X-Ray Diffraction (XRD) and Fourier Transform Infra-Red (FTIR) were used to characterize the prepared Fe3O4 and Fe3O4@SiO2. Scanning Electron Microscope (SEM) was used to analyze the effect of TEOS on the particle size, and Transmission Electron Microscopy (TEM) was used to observe the morphology of core-shell and shell thickness. The Brunauer-Emmett-Teller (BET) data revealed that Fe3O4@SiO2 (65) exhibited a larger pore diameter of 88.17 nm and eight-times higher BET surface area (80.23 m2/g) than Fe3O4@SiO2 (55) and Fe3O4@SiO2 (45) (27.69 nm; 10.5 m2/g). The Vibrating Sample Magnetometer (VSM) data indicated that increased TEOS addition on Fe3O4@SiO2 caused a decrease in the magnetization value but still gave good magnetic properties from 95.32 emu/g for Fe3O4@SiO2 (45) to 17.02 emu/g for Fe3O4@SiO2 (65). The study found that the higher SiO2 content reduced the agglomeration of the Fe3O4 core, as indicated by no hysteresis loop on the gas of Nitrogen (N2) adsorption-desorption curve of Fe3O4@SiO2 (65), resulting in core-shell material with better properties in higher specific surface area, average pore size and volume for further application.https://scientiairanica.sharif.edu/article_24197_3841dc0410fc9e17a55193410354ab17.pdfSharif University of TechnologyScientia Iranica1026-3098321320250801Numerical analysis of hybrid nanomaterial fluid flow with dust particles over a permeable vertical wedge2419810.24200/sci.2024.62250.7730ENNadeemAbbasDepartment of Mathematics and Sciences, College of Humanities and Sciences, Prince Sultan University, Riyadh, Saudi Arabia.WasfiShatanawiDepartment of Mathematics and Sciences, College of Humanities and Sciences, Prince Sultan University, Riyadh, Saudi Arabia.KamaleldinAbodayehDepartment of Mathematics and Sciences, College of Humanities and Sciences, Prince Sultan University, Riyadh, Saudi Arabia.Taqi A.M.ShatnawiDepartment of Mathematics, Faculty of Science, The Hashemite University, Zarqa, Jordan.Journal Article20230412nanofluid flows containing dusty fluids in a permeable vertical wedge. A mathematical model based on the concept of fluid flow was developed. The model uses the boundary layer approximation to simplify the partial differential equations. Using appropriate transformations, this set of differential equations is converted into a general system of differential equations. We used the method of obstacles and the BVP4C method. BVP4C approach to solve the obtained nonlinear dimensionless differential equations. We worked out to gain results of all values of non-dimensional space variable ζ and small values of ζ. The effects of involving physical significant parameters are highlighted by graphs. As the Richardson number increases, both the friction coefficient and the Nusselt number increase. This behavior demonstrates the complex interplay between buoyancy and momentum/heat transfer in the flow. Skin friction and Nusselt number declined due to increasing values of thermal slip. In summary, increased thermal slip affects fluid–solid surface interactions, resulting in lower skin friction (less resistance to fluid flow) and lower Nusselt number (reduced convective heat transfer).https://scientiairanica.sharif.edu/article_24198_49cda0938b5ba83282a210e4f9761820.pdfSharif University of TechnologyScientia Iranica1026-3098321320250801Analysis of oxytactic microorganisms and magnetic dipole for radiative cross fluid flow configured by nano-enhanced phase materials2419910.24200/sci.2023.60843.7018ENMuhammadTabrezDepartment of Mathematics, Mohi-ud-Din Islamic University, Nerian Sharif, Azad Jammu and Kashmir, Pakistan.Waqar AzeemKhanDepartment of Mathematical Sciences Federal Urdu University of Arts, Sciences and Technology, Islamabad, Pakistan.MuhammadIrfanDepartment of Mathematical Sciences Federal Urdu University of Arts, Sciences and Technology, Islamabad, Pakistan.IftikharHussainDepartment of Mathematics, Mohi-ud-Din Islamic University, Nerian Sharif, Azad Jammu and Kashmir, Pakistan.TaseerMuhammadDepartment of Mathematics, College of Science, King Khalid University, Abha, Saudi Arabia.Journal Article20220725Nanotechnology has attracted the interest of the research community because of its vast range of uses and applications, such as killing cancerous cell, preparation of medicines, nano-robot technology, manufacturing of modern aircraft, distillation process of water, biomedical engineering, thermal storage as well as transfer system, cooling of electronic devices, aircraft engines, power plants, coolants in nuclear reactors, construction industry etc. Here the concept of microorganism is utilized to make the suspension more stable and nanosized particles are used with the effect of bio-convection. The major purpose behind of this investigation is exploration of two-dimensional Cross fluid flow of ferrofluid with magnetic dipole effects. Moreover, the important features of Brownian motion along with the thermophoresis parameters are computed for the Cross model under the effects of magnetism termed as ferrofluid with consideration of important characteristics such as convective conditions on boundary motile microorganisms, as well as thermal gradients all are under consideration. Here, PDEs are converted into sets of ODEs and solved via bvp4c method. Results showed that temperature of ferrofluid increases with an increase in thermophoresis parameter as well as thermal effects, which results in a reduction of Prandtl number. The process of microorganism reduces for higher values of Peclet number.https://scientiairanica.sharif.edu/article_24199_10ef3e564c3fe0da1024da39a54226b5.pdfSharif University of TechnologyScientia Iranica1026-3098321320250801Three-dimensional stretched boundary layer flow of Casson nanofluid in rotating frame with bio-convection phenomenon2420810.24200/sci.2024.63534.8450ENMuhammadSohailInstitute of Mathematics, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan.Syed QasimHussain ShahInstitute of Mathematics, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan.FaisalSultanInstitute of Mathematics, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan.ShahJahanInstitute of Mathematics, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan.Syed TehseenAbbasInstitute of Mathematics, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, Pakistan.Journal Article20231115This paper describes the three-dimensional Casson nanofluid's rotating flow with bio-convection phenomenon containing microorganisms, thermal radiation, and magnetic effects. This research has real-world applications in a variety of processes, including oceanography, crystal growth, computer storage devices, lubrication, and rotating machinery. The present model incorporates the Buongiorno nanofluid model, which describes the Brownian and thermophoresis motion of nanoparticles. The boundary layer approximation and non-Newtonian three-dimensional Casson fluid model are encompassed in the modelling of the nonlinear partial differential system. Finding an analytical clarification to the 3D Casson nanofluid flow past a rotating frame involving bio-convection phenomenon nonlinear differential equation is the goal of this study. Graphical results are obtained using the Optimal Homotopy Asymptotic Method (OHAM). The effects of different parameters are examined with respect to velocities, thermal field, magnetic field, nanoparticle concentration, and microorganism field. The temperature distribution is reduced with a greater Prandtl number. The temperature and solute field of a species increase with an upsurge in the estimation of the thermophoresis parameter. The microorganism field decreases when the Peclet parameter, bio-convection Lewis number, and microorganism difference number increase.https://scientiairanica.sharif.edu/article_24208_87198b85e9a299b761dcefc557b76b3c.pdfSharif University of TechnologyScientia Iranica1026-3098321320250801Computational study on the influence of non-Newtonian nanofluids in fluid flow and heat transfer over a permeable surface with injection and suction2426210.24200/sci.2023.62190.7704ENImranAbbasDepartment of Mathematics, Air University, Islamabad, Pakistan.0000-0002-9715-4043ShahidHasnainDepartment of Mathematics, University of Chakwal, Chakwal, Pakistan.MuhammadSaqibDepartment of Mathematics, Khwaja Fareed University of Engineering and Information Technology, Punjab, Pakistan.DaoudSuleiman MashatDepartment of Mathematics, King Abdul-Aziz University, Jeddah, Saudi Arabia.Journal Article20230401This study examines the behaviour of non-Newtonian nanofluids in fluid flow and heat transfer over a permeable surface with injection and suction. The governing equations are converted into ordinary differential equations using a similarity approach and solved numerically with the Runge-Kutta-Fehlberg method. Copper (Cu), Copper Oxide (CuO), Titanium Oxide (TiO2), and Aluminum Oxide (Al2O3) nanoparticles are used in sodium Carboxymethyl Cellulose (CMC)/water as the base fluid to investigate the effects of power-law index, nanoparticle volume fraction, type, and permeability factor. The results indicate that Non-Newtonian nanofluids exhibit different behaviour than Newtonian nanofluids in the presence of suction and injection. Non-Newtonian nanofluid performs better than ewtonian nanofluid in terms of heat transfer for injection and an impermeable plate, but changing the type of nanoparticles has a larger effect on heat transmission during suction. Furthermore, the deployment of non-Newtonian nanofluids in injection processes leads to a decrease in heat transmission for all three scenarios. Additionally, the study indicates that higher injection rates result in improved heat transfer, while increased suction rates lead to reduced heat transmission.https://scientiairanica.sharif.edu/article_24262_e98abaa4a41664f4feb33d9b6720c011.pdf