Article
Energy & Fuels
Nur Syahirah M. Hanafi, Wan Aizon W. Ghopa, Rozli Zulkifli, Mohd Anas Mohd Sabri, Wan Fathul Hakim W. Zamri, Meor Iqram Meor Ahmad
Summary: Liquid coolant is commonly used to lower the temperature of an object. By introducing metal nanoparticles into a base fluid such as water, the heat transfer performance of the coolant can be increased. Hybrid nanofluids, which mix two types of metal nanoparticles with high thermal conductivity, have been developed to further enhance the heat transfer performance. In this study, a numerical analysis was conducted to investigate the effects of different types of coolants on heat transfer performance. The results showed that hybrid nanofluids had the highest heat transfer performance compared to pure water and single particle nanofluids. A mathematical formulation was also developed to describe the correlation between Reynolds number and volume concentration on the average heat transfer coefficient.
Article
Thermodynamics
R. Padiyaar, S. Suseel Jai Krishnan, M. Mahdavi, M. Sharifpur, J. P. Meyer
Summary: This study investigates the influence of free surface on jet impingement of aqueous nanodispersion dominant with hybridized nanoparticles. The hybrid nanofluid (HNF) was prepared using a two-step approach and its viscosity and thermal conductivity were measured at varying temperatures and volume concentrations. Nusselt number evaluations were conducted at different turbulent regimes and a numerical investigation was performed using Computational Fluid Dynamics (CFD) to model jet impingement. The results showed an increase in Nusselt number with the HNF, and a correlation for the Nusselt number was proposed based on the data obtained.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Mohammad Javidan, Ali Jabari Moghadam
Summary: This research establishes an experimental setup to effectively cool photovoltaic panels using SiC/water nanofluid as a coolant with various flow rates. The results show that using multi-orifice nozzles with relatively normal-concentration nanofluids leads to a more uniform temperature distribution in the photovoltaic module. Adjusting the flow rate and nanofluid concentration can increase electrical and thermal effects but has a negative impact on hydrodynamic results.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Nur Syahirah M. Hanafi, Wan Aizon W. Ghopa, Rozli Zulkifli, Shahrir Abdullah, Zambri Harun, Mohd Radzi Abu Mansor
Summary: This paper investigates the heat transfer performance of different nanofluid coolants with the employment of a single nozzle, axisymmetric, and confined jet impingement method. The results show that hybrid nanofluid exhibits the highest heat transfer performance.
Article
Thermodynamics
Jun-Suk Youn, Won-Woo Choi, Sung-Min Kim
Summary: The study primarily investigated the heat transfer characteristics of jet array impingement with effusion holes and aimed to provide basic data for the design of a gas-turbine casing cooling system. The three-dimensional numerical unit cell model was constructed and validated for a wide range of geometric parameters using previous experimental data. An assessment was made on the accuracy of previous Nusselt number correlations for a jet array impingement, and a new correlation was proposed for predicting the average Nusselt number for a jet array impingement with effusion holes.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Fatih Selimefendigil, Kaouther Ghachem, Norah Alwadai, Badr M. Alshammari, Lioua Kolsi
Summary: The cooling performance of a multi-slot jet impingement system for a wavy surface is investigated in this study, considering the combined effects of magnetic field, double active rotating cylinders, and nanofluid. The use of double rotating cylinders enhances the cooling process, and the Galerkin weighed residual finite element method is used for the solution of the governing equations. The impacts of rotational Reynolds number (Rew), magnetic field (MG-F) strength (Ha), MG-F inclination, and sub-cooling temperature of the cylinders (dT) on the cooling performance are analyzed.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Joo Hyun Moon, Soyeong Lee, Jungho Lee, Seong Hyuk Lee
Summary: This study numerically investigates the rapid cooling heat transfer characteristics of superheated solid surfaces when subjected to subcooled water jet impingement. The results show the formation of a vapor blanket near the impingement point, preventing direct contact between the liquid and heated surface.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Fatih Selimefendigil, Hakan F. Oztop
Summary: In this study, slot nano-jet impingement cooling of a wavy sinusoidal surface is analyzed using an L-shaped object and magnetic field. The presence and orientation of the L-shaped object have a significant impact on the heat transfer performance. The magnetic field suppresses vortices and improves cooling performance. The use of nanofluid further enhances the cooling performance compared to pure fluid.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Mathematics
Lioua Kolsi, Fatih Selimefendigil, Kaouther Ghachem, Talal Alqahtani, Salem Algarni
Summary: The coupled effects of double porous fins and inhomogeneous magnetic field on the cooling performance of multiple nanojet impingement for a corrugated surface were numerically analyzed. The results showed that magnetic field can significantly enhance the cooling performance, and its influence varies under different parameter conditions. The inclination and permeability of the double porous fins also affect the cooling performance to some extent, and the optimum set of parameters for the highest cooling performance was obtained through an optimization method.
Article
Thermodynamics
Yingchun Zhang, Weihong Li, Yong Li, Gongnan Xie
Summary: This study investigates the potential applications of nanofluids under magnetic fields in microchannel cooling and thermal absorption. A preconditioned lattice Boltzmann method (PLBM) is developed to study the thermo-hydraulic characteristics of Al2O3-water nanofluid in a microchannel with temperature-dependent physical properties. The effects of external magnetic field, buoyancy force, and volume fraction of nanoparticles are discussed, and entropy generation is analyzed. The results show that applying a magnetic field increases the average shear stress and Nusselt number, and the entropy generation caused by magnetic field irreversibility is higher than that caused by heat transfer irreversibility.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
Masomeh Ebrahim Qomi, Ghanbar Ali Sheikhzadeh, Abolfazl Fattahi
Summary: The cooling demand in micro-scale electrical equipment is increasing, and numerical analysis plays an important role in the development of micro-scale cooling systems. A study shows that micro-scale cooling is more beneficial for the thermal management of batteries.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Mohamed Ouni, Fatih Selimefendigil, Besbes Hatem, Lioua Kolsi, Mohamed Omri
Summary: This study analyzes the impacts of combined utilization of multi-jet impinging cooling of nanofluids with a magnetic field and porous layer on the cooling performance. Experimental results show that the average Nusselt number increases by about 17% and 20.4% for flat and wavy surface configurations when the Reynolds number is increased from 250 to 1000. The average Nusselt number increases by about 29% and 7% for flat and wavy cases when the magnetic field at the highest strength is used. The permeability of the porous layer is an effective way of controlling the cooling performance.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Thermodynamics
A. M. Tsirlin, I. A. Sukin, A. A. Demidov
Summary: This paper analyzes the structure of jet impingement systems used for computer cooling and proposes an algorithm for optimal synthesis of these systems. The optimal sequence of cooling flow contacting devices is found to depend on the temperature of each device rather than its power output.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Junfei Zhou, Jie Tian, Haiyin Lv, Han Dong
Summary: The effects of varying jet diameter on the cooling performance of single row jet impingement were numerically studied. The results show that the overall heat transfer is not significantly affected by the jet diameter distribution, but the heat transfer uniformity is heavily influenced.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
B. Pekmen Geridonmez, H. F. Oztop
Summary: This study numerically investigates the effect of inclined partial periodic magnetic field on natural convection flow of a hybrid nanofluid in isosceles right triangular cavities. The results show that partial periodic magnetic field can effectively control fluid motion and temperature stabilization.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Thermodynamics
Fatih Selimefendigil, Hakan F. Oztop
Summary: This study investigated the effects of a rotating tube bundle on the hydrothermal performance of forced convection in a vented cavity. The results showed that the rotational effects of the tube bundle had an impact on the heat transfer. The use of CNT particles led to higher heat transfer coefficients and lower pressure coefficients compared to the hybrid nanofluid.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Amin Shahsavar, Majid Jafari, Fatih Selimefendigil
Summary: This study evaluates the turbulent forced convective performance of water-silver nanofluid inside a horizontal internally spiral-ribbed heat exchanger tube using numerical methods. The effects of various parameters on the fluid characteristics are investigated. The results show that the nanofluid exhibits better hydrodynamic behavior and irreversibility than the plain water flow in the ribbed tube, with specific parameter combinations achieving the best performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
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, Chemical
Fatih Selimefendigil, Hakan F. Oztop
Summary: In this study, the cooling performance of nanofluid jet impingement with single and multiple jets is analyzed with the impact of using double porous layers with finite element method (FEM). The presence of the double porous layers significantly affects the convective heat transfer performance, with the variation in permeability having the largest impact on the performance.
CHEMICAL ENGINEERING COMMUNICATIONS
(2022)
Article
Thermodynamics
Hakan Cosanay, Hakan F. Oztop, Fatih Selimefendigil
Summary: This study performs computational analysis on the steady flow and heat transfer due to a slot nanojet impingement onto a heated moving body, considering the unsteady flow effects and interactions of multiple impinging jets. The finite volume method was used for numerical simulation, studying the influence of various parameters on convective heat transfer characteristics in the transient regime. The findings suggest that the flow field and heat transfer become complicated due to the interaction of multiple impinging jets with the movement of the hot body, with higher heat transfer rates achieved at higher Reynolds numbers and minimal impact from nanoparticle inclusion on flow friction.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Fatih Selimefendigil, Hakan F. Oztop
Summary: This study investigates nanoliquid impingement heat transfer with the installation of a phase change material (PCM) in a radial system. The results show that using PCM improves thermal performance, while the combination of nanoliquid and PCM achieves the best performance. Additionally, the height of the PCM layer and plate spacing have an impact on heat transfer performance.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Engineering, Multidisciplinary
Fatih Selimefendigil, Hakan F. Oztop, Lioua Kolsi, Mohamed Omri
Summary: The performance of a thermoelectric system in a chaotic channel is influenced by the type of fluid and Re number, resulting in varying power generation effects under different conditions. Nanofluids show potential in enhancing the power of the thermoelectric system, especially in channels containing shear thinning fluids.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Fatih Selimefendigil, Ceylin Sirin
Summary: The study investigates the impact of utilizing nano-enhanced thermal energy storage unit on the performance of a greenhouse dryer, comparing different types of greenhouse dryers. Results show that utilizing nano-enhanced modification significantly reduces drying time and improves energy efficiency.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Fatih Selimefendigil, Hakan F. Oztop
Summary: This study analyzes the effects of using a magnetic field and packed bed phase change material (PCM) system in a 3D cavity with ventilation ports on performance improvements during hybrid nanoliquid convection. Numerical simulations are conducted considering different inlet port locations and various parameters, showing that using PCM can enhance the average Nusselt number while the inlet port location has significant impacts on phase change dynamics and transition time.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Fatih Selimefendigil, Seda Ozcan Coban, Hakan F. Oztop
Summary: This study proposes a procedure for optimizing the convective drying performance of multi porous moist objects in a three dimensional channel. Utilizing numerical simulation and optimization algorithm, the research highlights the impact of spacing between objects on convective drying performance, with flow recirculation and flow reversal affecting thermal gradient variations.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Energy & Fuels
Fatih Selimefendigil, Ceylin Sirin, Hakan F. Oztop
Summary: By modifying the greenhouse drying system with solar absorber and thermally insulated north wall, as well as coating the designed north wall with graphene nanoplatelet-embedded black paint, drying time can be significantly reduced and efficiency improved.
Article
Energy & Fuels
Fatih Selimefendigil, Ceylin Sirin
Summary: In this study, three different PVT-air collectors were designed and manufactured, and their performances were compared through experiments. The results showed that utilizing a nano-enhanced thermal energy storage system and increasing flow rate significantly improved both the electrical and thermal performances of the PVT system.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Fatih Selimefendigil, Hakan F. Oztop
Summary: The thermal performance features of a coupled conjugate thermo-fluid system with different cooling configurations were explored using non-Newtonian nanofluid. Different system parameters, such as Reynolds numbers, power-law index, height, corrugation number, and jet distance, were studied to understand their effects on the thermal performance. The use of different nanoparticles and fluid parameters in various configurations resulted in different impacts on the thermal performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Kaouther Ghachem, Fatih Selimefendigil, Hakan F. Oztop, Muapper Alhadri, Lioua Kolsi, Naif Alshammari
Summary: This study investigates the phase change dynamics of hybrid nanofluid in a phase change packed bed with rotational surface effects, area expansion, and nanoparticle loading. Results show that higher rotational Reynolds number and nanoparticle concentration accelerate the phase change process, while the effects become reverse in the presence of rotations.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Lakhdar Aidaoui, Yahia Lasbet, Fatih Selimefendigil
Summary: This study characterizes the efficiency and entropy generation of nanofluid forced convection flow with chaotic perturbations under the influence of a non-uniform magnetic field. The combined effects of chaotic advection, nanoparticles, and non-uniform magnetic field were found to enhance fluid flow performance. The co-effect of magnetic intensity, orientation, and application mode was shown to stimulate energy system performance, with entropy generation mainly attributed to thermal irreversibilities in laminar flow.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
