Article
Mathematics, Applied
M. D. Alsulami, R. Naveen Kumar, R. J. Punith Gowda, B. C. Prasannakumara
Summary: The study investigates the heat transport properties under the lack of local thermal equilibrium conditions using a simplified mathematical model. The results suggest that the LTNE model yields two distinct primary thermal gradients between the fluid phase and the solid phase. The impact of different parameters on the velocity and thermal performance of non-Newtonian fluid flow containing Ti6Al4V and AA7075 nanoparticles in a porous media with magnetic effect is discussed.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Thermodynamics
Youness Foukhari, Mohamed Sammouda, Mohamed Driouich
Summary: The aim of this study is to investigate the MHD natural convection in an annular partially porous metal space saturated by nanofluid, in order to create new models and designs for heat transfer systems. The numerical results show that various control parameters have a significant impact on heat transfer, and using an optimum thickness layer of stainless steel porous medium can enhance thermal energy transport.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Engineering, Multidisciplinary
Rowsanara Akhter, Mohammad Mokaddes Ali, M. A. Alim
Summary: This investigation explores the fluid flow and temperature behaviors, as well as entropy generation, of hybrid nanofluid in a partially heated cavity saturated by porous medium in the presence of an external magnetic field. The results show that the magnetic field strength, amount of hybrid nanoparticles, and cavity permeability have a significant influence on the fluid flow, temperature, and local entropy generation.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
A. Sattar Dogonchi, S. R. Mishra, Ali J. Chamkha, M. Ghodrat, Yasser Elmasry, Hesham Alhumade
Summary: This article investigates the heat transfer, entropy generation, and fluid flow behavior inside a porous enclosure using a numerical method called FEM for a square cylinder filled with magnetic nanoliquid. The study found that entropy generation increases with rising Hartmann number and Rayleigh number, leading to velocity gradient overshooting within the enclosure. Results show different heat transfer and fluid flow characteristics for varying parameters combinations.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Usman, Abid Ali Memon, Metib Alghamdi, Taseer Muhammad
Summary: The article investigates heat transfer characteristics of a water alumina nanofluid through a three-dimensional annular. The study found that the average Nusselt number at the middle of the annular increases initially with volume fraction before decreasing, while the average percentage change in temperature relative to the inner cylinder's hot temperature decreases with an increase in volume fraction.
SCIENTIFIC REPORTS
(2022)
Article
Thermodynamics
Yan Cao, Hamdi Ayed, Hussein Togun, Ali Shawabkeh, Mahidzal Dahari, Makatar Wae-hayee, Abir Mouldi, Riadh Marzouki
Summary: This study simulated the natural convection of water-Al2O3 nanofluid in a cold semi-annulus chamber with a hot block at the bottom, and applied an oblique magnetic field (MHD) to improve and control the flow. Increasing the volume fraction of nanoparticles was found to enhance the Nusselt number at low Rayleigh numbers, while the Nusselt number was inversely related to the Hartmann number at high Rayleigh numbers.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mechanics
M. S. Asmadi, R. Md. Kasmani, Z. Siri, H. Saleh
Summary: This study investigates natural convection heat transfer inside a U-shaped enclosure using copper-alumina/water hybrid nanofluid with various thermal profiles. The results show that constant heating profile has the best heat dissipation performance, while sinusoidal thermal profile performed the worst.
Article
Thermodynamics
Imtiaz Ali Shah, S. Bilal, Taseer Muhammad, Sayed M. Eldin
Summary: The prime motive of this case study is to investigate the enhancement in flow and thermal properties of water by adding carbon nanotubes and ferrite particles. A hexagonal enclosure with fillets at boundaries is considered for its physical significance in multiple heat exchange systems. The physical impact of a horizontal magnetic field and the adjustment of a heat circular cylinder are employed. The problem is formulated with necessary assumptions and boundary constraints in a dimensionless format. Thermophysical relations are utilized to explain the behavior of the distributions. Finite Element Method (FEM) is used to solve the modelled problem and the results are presented through snapshots and tables. The comparison of single and muti walled carbon nanotubes shows the rising trend of the velocity field in the hydrodynamic case compared to the hydromagnetic case. The heat transfer rate is found to be higher in the Fe3O4/MWCNT/water hybrid nanofluid. Results and code validation tests are conducted to ensure the credibility of the work.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Rumman Hossain, A. K. Azad, Md Jahid Hasan, M. M. Rahman
Summary: This study conducted a numerical analysis of thermal radiation in a square enclosure with a semicircular heater and a sliding lid. The results showed that increasing radiation intensity and dimensionless time improves fluid velocity, pressure gradient, and temperature gradient, but decreases the heat transfer rate of the semicircular heater.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Mechanics
Surabhi Nishad, Rama Bhargava, Ameeya Kumar Nayak, Bernhard Weigand
Summary: Energy flux analysis of power-law fluid is a novel contribution to recent developments in computational fluid dynamics. The study investigates the influence of double diffusive effect on unsteady two-dimensional flow inside a complex enclosure and proposes a method for optimizing heat transfer rate. By comparing the computational time and accuracy of the finite volume method and element-free Galerkin technique, the study obtains results such as streamlines, isotherms, isoconcentrations, average Nusselt number, Sherwood number, etc., and analyzes the impact of various parameters. In addition, the study employs a mesh-free approach, providing a new method for further analysis of elliptical/semi-elliptical structures.
Article
Thermodynamics
Naeem Ullah, Sohail Nadeem, Arif Ullah Khan
Summary: Numerical simulations were conducted to investigate natural convection in a rectangular cavity containing CuO-water nanofluid. The results showed that thermal distribution and flow field became stronger with increasing Rayleigh numbers and wavelength numbers. The increase in nanoparticle volume fraction was found to enhance heat transfer rate due to dominant convection.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Mechanical
Krishno D. Goswami, Anirban Chattopadhyay, Swapan K. Pandit
Summary: This study presents a numerical simulation of steady thermogravitational convection of Cu-Al2O3 water-hybrid magneto-nanofluid in a novel shaped enclosure. The results show that the combination of heater locations and geometry has a significant impact on the transport phenomena, and Cu-Al2O3 hybrid nanoparticles play a crucial role in enhancing heat transfer.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Thermodynamics
Ammar Abdulkadhim, Isam Mejbel Abed, Nejla Mahjoub Said
Summary: This study experimentally investigates the natural convection heat transfer in a three-dimensional I-shaped enclosure with wavy-walled and inner circular pipe. One layer is filled with Al2O3-water nanofluid while the other layer is filled with nanofluid/porous medium. The thermophysical properties of the nanofluid are measured, including thermal conductivity, viscosity, and density. The experimental results show good agreement with the calculated properties based on theoretical models within the studied nanofluid concentrations. Thermocouples are installed to measure the temperature, and magnetic fields are applied to observe the slight increase in temperature. It is also found that increasing the hot side wavy-walled temperature leads to an increase in the temperature difference in the nanofluid-porous region and the nanofluid region.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Mechanics
Aneela Bibi, Hang Xu
Summary: This article investigates fluid dynamics and heat transfer properties in a trapezoidal enclosure containing a heated cylindrical object. It explores the interaction of multiple physical processes and analyzes the governing equations numerically. The findings demonstrate the various factors influencing the thermal and mass transfer in the enclosure, and the effectiveness of the multiple expression programming (MEP) technique in predicting heat transfer behavior.
Article
Materials Science, Multidisciplinary
Mubbashar Nazeer, M. Waqas Nazir, Nasir Ali, Tariq Javed, Shaimaa A. M. Abdelmohsen, M. Ijaz Khan
Summary: The thermal performance of water-based nanofluids with two different types of hybrid nanofluids for the cooling process of the radiator inside the thermally heated square cavity under the addition of thermal radiation and magnetic field is investigated using the finite element method. The computational results show that the aluminum alloy nanofluid and titanium alloy nanofluid provide higher heat transfer compared to regular fluid, which is important for improving the heat transfer of the engine and enhancing the lifespan of machinery.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Energy & Fuels
Amin Shahsavar, Majid Jafari, Ighball Baniasad Askari, Fatih Selimefendigil
Summary: In this study, the influence of the number of ribs on the laminar forced convection flow of a silver/water-ethylene glycol nano-fluid in a rifled tube was investigated using the two-phase mixture model. The results showed that increasing the number of ribs was beneficial from the perspective of the first-law performance, but undesirable from the perspective of the second-law performance. It was also found that the rifled tube consistently outperformed the plain tube in terms of hydrothermal performance.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Engineering, Mechanical
Kotha Gangadhar, R. Edukondala Nayak, M. Venkata Subba Rao, Ali J. Chamkha
Summary: This paper examines the mechanism of radiative Walter's B nanofluid on a rotational cone under magnetic regime, including the theoretical and practical implications of time-dependent fluid flow caused by cone rotation in engineering and applied sciences, as well as the characteristics of thermophoresis, Brownian motion, and chemical reactions. Self-similar solutions are obtained and the numerical result of a reduced nonlinear system is obtained using the Runge-Kutta-Fehlberg fourth-fifth procedure. Comparisons with previously published material are made to verify the outcome. The conflicting influences of the Brownian motion parameter on heat and mass transfer rates, as well as temperature and concentration fields, are found. The presence of chemical reactions may be more beneficial in developing reaction processes.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
K. Gangadhar, M. Venkata Subba Rao, D. Naga Bhargavi, Ali J. Chamkha
Summary: This research focuses on the hydrothermal characteristics of magnetohydrodynamic nanofluid flow over a slippery permeable bended surface. The study reveals that the concentration gradient of nanoparticles is affected by Brownian motion and thermophoretic force. The results also show that increasing magnetic parameter values decrease the velocity field magnitude and pressure in the boundary layer.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Thermodynamics
Dipak Kumar Mandal, Nirmalendu Biswas, Nirmal K. Manna, Rama Subba Reddy Gorla, Ali J. Chamkha
Summary: This study numerically examines the influence of various geometric parameters on the thermal performance of a novel W-shaped porous cavity undergoing hybrid nanofluid-based magnetohydrodynamic mixed convection. The results show that an increase in the bottom undulation height improves the thermal energy transfer despite the reduction of fluid volume. The overall thermal energy transport is improved by increasing Reynolds number, Richardson number, and Darcy number, while it is suppressed by increasing Hartmann number.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Engineering, Mechanical
Bhupendra Kumar Sharma, Umesh Khanduri, Nidhish K. Mishra, Ali J. Chamkha
Summary: This study numerically investigates the combined effects of Arrhenius activation and microorganisms on unsteady flow through a porous medium with thermophoresis and Brownian motion. The results have important implications for geothermal engineering, energy conversion, disposal of nuclear waste material, as well as applications in medical fields such as gene therapy and drug delivery systems.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Thermodynamics
Hussan Zeb, Hafiz A. Wahab, Umar Khan, Ali J. Chamkha
Summary: This study analyzed the characteristics of heat transfer in non-Newtonian ferrofluids produced by stretchable sheet and investigated the effects of Arrhenius activation energy and magnetic dipole. By applying a similarity ansatz and Runge-Kutta method, the computational solution for the governing system was determined. The influence of beneficial physical parameters on momentum, energy, and concentration profiles was shown through graphs.
Article
Thermodynamics
Shreedevi Kalyan, Ashwini Sharan, Ali J. Chamkha
Summary: This article examines the effect of heat and mass transfer flow of two immiscible Jeffrey fluids in a vertical channel. The impact of different physical parameters on the flow and distribution of velocity, temperature, and concentration is illustrated graphically.
Article
Thermodynamics
Alexander Nee, Bubryur Kim, Ali J. Chamkha
Summary: The present study focuses on the numerical analysis of heat transfer and fluid flow patterns in a three-dimensional problem formulation. A hybrid mathematical model is built, and the equations are solved using MATLAB. The results show that the emissivity of the vertical walls can be used as a tool to control thermal and flow behavior.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Energy & Fuels
Fatih Selimefendigil, Furkan Dilbaz, Hakan F. Oztop
Summary: The thermal management of lithium-ion batteries is crucial for improving their performance and lifespan. This study proposes a novel cooling system using an inner cylinder and different-shaped nanoparticles as the cooling medium. Numerical analysis shows that both cooling media reduce the highest temperature and homogenize the temperatures in the battery as the Reynolds number increases. The utilization of a nanofluid containing cylindrical-shaped nanoparticles and a cylinder in the mini-channel proves to be an effective cooling system for battery thermal management.
Article
Thermodynamics
Fatih Selimefendigil, Hakan F. oeztop
Summary: The design of a cooling system for a curved conductive panel is developed using nano-enhanced multiple jet impingement. The study shows that the type of panel and operating parameters affect cooling performance and entropy generation. Adjustments in operating parameters can improve cooling effectiveness and reduce entropy generation.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Hakan F. Oztop, Fatih Selimefendigil, Hakan Cosanay, Nidal Abu-Hamdeh
Summary: In this study, the phase change process and convection inside an open cavity equipped with two different phase change materials (PCMs) were analyzed using the finite volume method with ANSYS Fluent. The analysis was conducted for different Grashof number values and it was found that the PC becomes faster when the object is closer to the exit in the fully open case. The partly open case results in higher thermal performance improvements, with a 94.5% increase in the average Nusselt number for PCM-18.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Green & Sustainable Science & Technology
Fatih Selimefendigil, Damla Okulu, Hakan F. Öztop
Summary: Two different cooling systems were developed for the thermal management of a photovoltaic module. The PV/TEG and PV/TEG-mini-channel cooling systems used water and Al2O3 nanofluids in the cooling channel. Higher-loading nanoparticles in the base fluid achieved effective cooling, and the nanofluid showed non-Newtonian behavior. The PV/TEG-cooling channel with the lowest fluid inlet temperature and the highest particle loading resulted in significantly increased PV efficiency and TEG output power compared to PV/TEG and conventional PV systems without cooling.
Article
Energy & Fuels
Hakan F. F. Oztop, Elanur Baki Sezgin
Summary: The use of containers with streamlined corners reduces the melting time of phase change materials (PCMs) under the same boundary conditions, serving as a passive control method to improve energy efficiency.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Thermodynamics
Burak Kiyak, Hakan F. Oztop, I. Gokhan Aksoy
Summary: This study investigated the melting performance of phase change materials in a disk-shaped container with partial circular heating. The results showed that in partial heating cases, increasing the aspect ratio extended the melting time and decreased the liquid fraction.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Sudhanshu Kumar, Krunal M. Gangawane, Hakan F. Oztop, Sibasish Panda
Summary: This research work presents a numerical investigation of magnetohydrodynamics (MHD) characteristics near-wall blockage due to double-diffusive convection (DDC) in a rectangular cavity. The results show that as the separation distance increases, heat and mass transfer rates enhance, while the increase in Hartmann number (Ha) results in a monotonic decrease in heat and mass transfer rates.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
