Article
Mathematics, Applied
F. Munazza, M. Asif Farooq
Summary: The aim of this study is to analyze the heat source in unsteady MHD nanofluid flow with convective boundary conditions past a stretching cylinder that incorporates variable thermal properties. This study is important for industries such as chemical processing, oil and gas, and manufacturing. By using similarity variables, the governing partial differential equations are transformed into ordinary differential equations and a nonsimilar solution is obtained. The numerical solution is found using MATLAB package bvp4c and the velocity, temperature, and concentration curves are plotted for various parameters. The values for skin friction coefficient, heat transfer coefficient, and mass transfer rate are tabulated for different parameters.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Thermodynamics
Priyanka Agrawal, Praveen Kumar Dadheech, R. N. Jat, Dumitru Baleanu, Sunil Dutt Purohit
Summary: This study investigates the heat transfer properties of three different radiative hybrid nanofluids flowing over a stretching surface, showing the effects of various parameters on heat transfer and suggesting potential applications in biomedical, microelectronics, thin-film stretching, lubrication, and refrigeration industries.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Mathematics
Shahirah Abu Bakar, Norihan Md Arifin, Najiyah Safwa Khashi'ie, Norfifah Bachok
Summary: This study investigates the flow of hybrid nanofluid over a permeable Darcy porous medium with slip, radiation, and shrinking sheet. The non-uniqueness of solutions and increased heat transfer rate in hybrid nanofluid compared to traditional nanofluid are observed. Solutions stability analysis shows that the upper solution is stable while the lower solution is not stable.
Article
Mathematics, Applied
Irfan Rashid, Muhammad Sagheer, Shafqat Hussain
Summary: This study analyzes the magnetohydrodynamic flow of magnetite-engine oil nanofluid in the presence of nonidentical shaped nanoparticles subject to the porous medium and velocity slip effect. The impacts of Ohmic heating and thermal radiation are considered. The velocity and temperature profiles are found to be influenced by various emerging parameters. The findings provide insights into the flow characteristics of the nanofluid.
NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS
(2023)
Article
Thermodynamics
Ubaidullah Yashkun, Khairy Zaimi, Nor Ashikin Abu Bakar, Anuar Ishak, Ioan Pop
Summary: This study investigates the heat transfer characteristics of MHD hybrid nanofluid over a linear stretching and shrinking surface with suction and thermal radiation effects. The study finds that the heat transfer efficiency of the hybrid nanofluid is greater than the nanofluid, and dual solutions exist for a specific range of the stretching/shrinking parameter. Additionally, the skin friction coefficient and local Nusselt number increase with suction effect, and suction and thermal radiation widen the range of the stretching/shrinking parameter for which solutions exist.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Physics, Multidisciplinary
Elsayed M. A. Elbashbeshy, Hamada Galal Asker
Summary: This paper investigates the boundary layer flow of a nanofluid containing gyrotactic microorganisms over a vertical stretching surface embedded in a porous medium. The effects of various controlling parameters on velocity, temperature, nanoparticle concentration, and microorganisms conservation are analyzed numerically. The results show that increasing the porosity parameter enhances the surface cooling effect.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Engineering, Multidisciplinary
Y. Dharmendar Reddy, B. Shankar Goud, Kottakkaran Sooppy Nisar, B. Alshahrani, Mona Mahmoud, Choonkil Park
Summary: This study numerically investigates the magnetohydrodynamic (MHD) heat transfer properties of an incompressible viscous fluid across a continuously expanding horizontal cylinder immersed in a porous material with internal heat production/sink. The governing partial differential equations are transformed into a collection of non-linear ordinary differential equations (ODEs) using similarity variables and numerically solved using the Keller-Box approach. The fluid velocity, temperature, friction factor, and rate of heat transfer are calculated. Graphs and tables illustrate the fluid velocity and heat transfer properties for various Prandtl numbers and magnetic parameters. The study aims to examine the effects of the magnetic field (M), Prandtl number (Pr), and heat absorption/generation factor (Q) on the velocity and temperature gradients along a stretching cylinder. It is projected that an increase in the curvature parameter and porosity factor enhances the temperature gradient in the boundary layer region around the cylinder.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Education, Scientific Disciplines
Ahmed M. Sedki, S. M. Abo-Dahab, J. Bouslimi, K. H. Mahmoud
Summary: The study investigates the impact of mixed convection and thermal radiation on unsteady boundary layer heat transfer and nanofluid flow over a permeable moving surface via a porous medium, with consideration of heat generation. The governing equations are transformed and solved numerically, revealing the influence of thermophysical parameters analytically and graphically with comparisons to prior studies showing good agreement.
Article
Education, Scientific Disciplines
Ahmed M. M. Sedki, S. M. Abo-Dahab, J. Bouslimi, K. H. Mahmoud
Summary: The study examines the impact of mixed convection and thermal radiation on nanofluid flow over a permeable moving surface in a porous medium. The effects of heat generation are also discussed. The transformed equations are numerically solved to analyze the influence of thermo-physical parameters.
Article
Thermodynamics
Vandana Agarwal, Bhupander Singh, Kottakkaran Sooppy Nisar
Summary: This study investigates the micropolar Jeffrey fluid flow in the presence of a magnetic field across a stretching surface through porous medium using numerical methods. The influence of various parameters on velocity, micro-rotation, and temperature profiles has been studied and discussed, with the results plotted for flow and heat transfer characteristics.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Mechanics
Feroz Ahmed Soomro, Mahmoud A. Alamir, Shreen El-Sapa, Rizwan Ul Haq, Muhammad Afzal Soomro
Summary: In this work, the behavior of magnetohydrodynamic fluid flow over a permeable surface was studied using similarity transformation technique and artificial neural network models. The study revealed a decrease in heat transfer rate with increasing first- and second-order slip parameters. The neural network models showed high accuracy in predicting skin friction coefficients and heat transfer rates, reducing the time required for numerical predictions.
ARCHIVE OF APPLIED MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Ali Rehman, Anwar Saeed, Zabidin Salleh, Rashid Jan, Poom Kumam
Summary: This paper investigates the time-dependent stagnation point flow of CNT nanofluids over a stretching surface and finds that CNT nanofluids have high heat transfer ratios. By using mathematical methods, the simplified nonlinear differential equations are solved and the effects of different parameters on velocity and temperature profiles are explained using graphs.
Article
Engineering, Chemical
U. S. Mahabaleshwar, K. N. Sneha, Huang-Nan Huang
Summary: This study investigates the thermohydrodynamic attribution of boundary layer flow of incompressible liquid with carbon nanotubes, considering mass transpiration and radiation effect. The results suggest that carbon nanotubes have promising potential for heat transfer applications. Closed-form analytical solutions for velocity and temperature are obtained, and the behavior of velocity distribution and wall heat flux is analyzed.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Thermodynamics
Nadeem Abbas, Khalil Ur Rehman, Wasfi Shatanawi, M. Y. Malik
Summary: This study examines the flow of a hybrid nanofluid past a permeable curved surface with nonlinear stretching, considering two types of particles and a porous medium. Mathematical models based on the Navier-Stokes equations are developed and transformed into a system of nonlinear ordinary differential equations. The effects of physical parameters on velocity and temperature profiles are analyzed using numerical methods. The study compares the heat transfer scale of the hybrid nanofluid to that of a simple nanofluid, considering suction and injection cases.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Mathematics, Applied
Imran Khan, Hakeem Ullah, Hussain AlSalman, Mehreen Fiza, Saeed Islam, Muhammad Shoaib, Muhammad Asif Zahoor Raja, Abdu Gumaei, Farkhanda Ikhlaq
Summary: This article presents an effective computing approach utilizing the Levenberg-Marquardt scheme for solving a magnetohydrodynamics fractional flow problem. The method is validated by creating a dataset using the fractional optimal homotopy asymptotic method, showing good convergence and numerical results. The approach proves to be effective in finding a solution for the specified problem.
JOURNAL OF FUNCTION SPACES
(2021)
Article
Engineering, Multidisciplinary
Amin Gholami, Davood D. Ganji, Hadi Rezazadeh, Waleed Adel, Ahmet Bekir
Summary: The paper introduces a strong method called the modified Mickens iteration technique for solving a strongly nonlinear system, with applications in the field of nonlinear vibrations and oscillation systems. The method shows promising results in terms of accuracy and convenience, making it a potential candidate for solving other nonlinear problems in science and engineering.
INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
(2023)
Article
Acoustics
Parvin Mahmoudabadi, Mahsan Tavakoli-Kakhki, S. Hassan HosseinNia
Summary: This paper presents a controller design method for the AFM system based on a fuzzy model and linear matrix inequality formulation. The proposed method accurately represents the system and effectively suppresses chaos and reduces disturbance.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Metallurgy & Metallurgical Engineering
Mehdi Safari, Ricardo Alves de Sousa, Jalal Joudaki
Summary: In this study, the bending of mild steel tubes was investigated using a laser beam. The effects of six process parameters on the bending angles were examined. The results showed that increasing laser power, irradiation length, and number of irradiation passes, as well as reducing scanning speed and laser beam diameter, led to higher bending angles.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Automation & Control Systems
Ali Ahmadi Dastjerdi, Alessandro Astolfi, S. Hassan HosseinNia
Summary: Reset controllers have the potential to improve the performance of high-precision industrial motion systems. However, analyzing the stability of these controllers is complex and requires the parametric model of the system, which may limit their applicability. This paper proposes a frequency-domain approach to assess the stability properties of control systems with first and second-order reset elements. The proposed approach can also determine the uniformly bounded-input bounded-state (UBIBS) property for reset control systems when resetting to non-zero values. An illustrative example is provided to demonstrate the effectiveness of using frequency response measurements to assess the stability properties of reset control systems.
Article
Automation & Control Systems
Ali Ahmadi Dastjerdi, Alessandro Astolfi, Niranjan Saikumar, Nima Karbasizadeh, Duarte Valerio, S. Hassan HosseinNia
Summary: This article presents a closed-loop frequency analysis tool for reset control systems. It provides sufficient conditions for the existence of steady-state response and shows that the steady-state response for periodic inputs is periodic with the same period as the input. The framework presented in this article allows for the computation of steady-state response and defines a notion of closed-loop frequency response, including high order harmonics.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2023)
Article
Automation & Control Systems
Nima Karbasizadeh, Ali Ahmadi Dastjerdi, Niranjan Saikumar, S. Hassan HosseinNia
Summary: This article discusses the nonlinearity and effects of reset elements. Reset elements have less phase lag based on describing function (DF) analysis compared to their linear counterparts, but they produce higher-order harmonics. The article investigates the steady-state higher-order harmonics for reset elements with one resetting state and proposes an architecture and design method to band-pass the nonlinearity and its effects.
IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY
(2023)
Article
Mathematics, Applied
Adel Karimbakhshi Rostami, Davood Domiri Ganji
Summary: This study investigates the heat transfer in a shell and helically coiled finned tube heat exchanger with stepped annular fins for the first time. Using response surface methodology, correlations are proposed to predict the Nusselt number based on geometric and operating parameters. The results show that the parameters Re and Pr have the most impact on the Nusselt number.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Physics, Multidisciplinary
Elham Tayari, Leila Torkzadeh, Davood Domiri Ganji, Kazem Nouri
Summary: This research investigates the non-Newtonian natural convection of a hybrid nanofluid consisting of single-wall carbon nanotubes (SWCNT) and multi-wall carbon nanotubes (MWCNT) based on methanol fluid between two parallel vertical plates. The collocation method based on radial basis functions (RBF) is used to solve the reduced ordinary differential equations. The results obtained using the RBF method are in good agreement with the numerical method, demonstrating the effectiveness of the RBF method. The velocity distribution and boundary layer thickness are influenced by the hybrid nanotubes volume fraction.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Energy & Fuels
M. Sheikholeslami, M. Jafaryar
Summary: In current work, it has been suggested to invent new fins with vase-shaped to incorporate in the storage enclosure in order to decrease energy consumption. The combination of heat storage with the shape of a triplex tube and a parabolic solar unit enhances efficiency. The properties of paraffin were improved by dispersing SiO2 nanoparticles. Different proposed models were analyzed using the finite volume method to determine the best arrangement for maximum efficiency and minimum charging time.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
H. Nabi, M. Gholinia, D. D. Ganji
Summary: The present study investigated the increase in heat transfer rate of a microchannel heatsink with high heat flux using topology structures and CNTs nanofluids. Four nature-inspired topology structures were compared with a straight microchannel heatsink. The spider netted model showed the highest heat transfer coefficient and pressure changes. The use of SWCNT-H2O nanofluid increased the heat transfer coefficient and pump power by 56.1% and 46.1% respectively at a Reynolds number of 550.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mechanics
S. A. Abdollahi, P. Jalili, B. Jalili, H. Nourozpour, Y. Safari, P. Pasha, D. D. Ganji
Summary: This study investigates the flow and thermic field characteristics of a coherent nanofluid-guided microchannel heat sink. It evaluates the cooling effect of a hybrid blend of copper and aluminum nanoparticles added to water. The results show that increasing the volume fraction of nanoparticles lowers the temperature and improves the heat transmission rate.
THEORETICAL AND APPLIED MECHANICS LETTERS
(2023)
Article
Engineering, Mechanical
Mehran Mohammadi, Khashayar Hosseinzadeh, Davood Domiri Ganji
Summary: This article presents a novel design of a vortex chamber with axial grooves for cooling the leading edge of turbine blades. The chamber generates a vortex through nine tangential inlets and includes an axial groove. The grooves enhance flow turbulence and increase heat transfer by disrupting the thermal boundary layer. Using a 3D model based on the Reynolds-averaged Navier-Stokes equation, different turbulent models and experimental data were compared, with the Reynolds stress model (RSM) showing the highest accuracy. Various groove sizes, positions, and numbers were examined to study the vortex structure and heat transfer mechanism. The results revealed improved heat transfer in the chamber with grooves, especially with three grooves resulting in an average Nusselt number increase of over 4%. The pressure difference between chambers with and without grooves was not significant, but the highest friction factor occurred in the case with three grooves.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
As'ad Alizadeh, Azher M. Abed, Hussein Zekri, Ghassan Fadhil Smaisim, Bahram Jalili, Pooya Pasha, Davood Domiri Ganji
Summary: This investigation focuses on the heat removal from surfaces with high heat flux, utilizing tabulators and parts with a unique geometry as a solution. The primary hypothesis is to enhance fluid heat transfer through increased turbulence and heat transfer area, achieved by the simultaneous use of a turbulator and increased contact surface. The research applies the limited volume method and Ansys Fluent software to solve governing equations and compares turbulators SLT and TRT with others in terms of Nusselt number and friction coefficient reduction.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
M. Sheikholeslami
Summary: The influence of porous media on the solidification of water with hybrid nanoparticles has been simulated in this study. A tree-shaped fin and the impact of radiation were utilized to expedite the process. The hybrid nanomaterial consisted of a mixture of Al2O3 and CuO with a volume fraction of 0.01 for each powder type, making the homogeneous mixture approximation logical. A wiremesh packed approach was used to model the porous foam, and the impact of porosity on the freezing process was analyzed. The temperature equation, including two source terms for radiation and phase changing, was considered, and the Galerkin method was implemented for solving the equations.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Multidisciplinary
M. H. Pahlavanian, Davood Domiri Ganji
Summary: Arterio-venous grafts (AVGs) are commonly used for long-term vascular access in hemodialysis. Intimal hyperplasia (IH) caused by unfavorable hemodynamic conditions is the main reason for AVG failure. This study utilizes computational fluid dynamics (CFD) to assess the impact of different geometrical designs on the hemodynamic conditions at the venous anastomosis. The results show that optimizing the anastomosis angle and introducing cross-sectional ridges in the graft can significantly reduce the risk of IH development.
RESULTS IN ENGINEERING
(2023)
