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Article
Thermodynamics
Saeed Rakhsha et al.
Summary: The paper investigates the impact of nozzle geometry on the flow and heat transfer from a pulsed jet into a concave surface. Both experiments and numerical simulations were conducted, and the results showed that the nozzle geometry directly affects the air entrainment ratio and the average Nusselt number. Increasing the aspect ratio of the nozzle decreases the Nusselt number. Pulsating the inlet jet increased the average Nusselt number compared to a steady jet.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Mohsen Izadi et al.
Summary: A numerical study was conducted to investigate the impact of using nanofluid in a double-pipe heat exchanger with spindle-shaped turbulators on heat transfer rate and pressure drop. The results showed that adding 0.01 volumetric fraction of nanoparticles to the base fluid increased the heat transfer coefficient by 11.45% at Re 4000 and 11.91% at Re 7000. While increasing the volume fraction of nanoparticles reduced the heat exchanger performance index, this reduction was minimal when compared to the base fluid at a volume fraction of 0.01.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Multidisciplinary
Zeinab Esmaeili et al.
Summary: The simultaneous use of turbulators and nanofluids is an effective strategy for improving the thermal performance of parabolic solar collectors. A three-dimensional numerical simulation was used to investigate the effects of using a turbulator and adding hybrid nanoparticles on the heat transfer rate and entropy generation in a parabolic trough collector. The results showed that the use of conical helical gear rings as turbulators increased the heat transfer by 35.7% and decreased the total entropy generation by 32.8%.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Multidisciplinary
Mohammadreza Niknejadi et al.
Summary: This research investigates the influence of vortex generators (VGs) with different geometric shapes and Cu-TiO2/H2O nanofluid (NF) on the thermal-hydraulic (TH) performance, energy efficiency, and exergy of a solar collector (SC). The study focuses on the turbulent flow regime (TFR) and uses the QUICK algorithm for equation discretization. Results show that convective heat transfer (CHT), average Nusselt number (Nuavg), and pressure drop (PD) all increase with the inlet velocity of Cu-TiO2/H2O NF flow. Additionally, the addition of VGs and changing their placement states improves the performance evaluation criterion (PEC) of the SC.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Thermodynamics
Baoquan Mao et al.
Summary: Numerical studies have shown that heat transfer in magnetogasdynamic flow can be controlled by applying magnetic fields, but there lacks experimental verification. This study develops an experimental system to study the effects of magnetic fields on convective heat transfer of plasma jets in circular tubes. The results demonstrate that both parallel and perpendicular magnetic fields can suppress heat transfer, and the effect of the perpendicular field is anisotropic while the parallel field is isotropic. The magnetic field intensity, DBD reactor voltage, and airflow velocity also affect the heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Seyedmahmood Kia et al.
Summary: In this study, the heat transfer and pressure drop properties of Al2O3 and SiO2/Base oil nanofluid flow in a helical tube were investigated numerically and experimentally. The impact of various parameters, including flow Reynolds number, fluid temperature, nanoparticles, and weight concentrations, on the heat transfer factor and pressure drop was analyzed. The results showed that nanofluid enhanced the heat transfer factor and pressure drop compared to the base fluid. The Al2O3 nanofluid exhibited higher heat transfer coefficient than the SiO2 nanofluid. The maximum heat transfer rate was achieved with 0.5% mass concentrations of Al2O3 and SiO2 nanofluids. The helical tube geometry improved heat transfer by 19.5%, and reducing helical pitch and pitch circle diameter further enhanced the heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Abazar Abadeh et al.
Summary: This study investigates the effects of adding TiO2 and Al2O3 nanoparticles to water on heat transfer and fluid flow characteristics in a microtube. The influence of nanoparticle volume fraction, magnetic field strength, slip parameter, and NBT coefficient are studied, and the behavior of the nanofluids under different conditions is investigated. The results are compared with those of other researchers, showing acceptable similarity.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Engineering, Multidisciplinary
As'ad Alizadeh et al.
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
Thermodynamics
Yang Zuo et al.
Summary: The heat transfer characteristics of supercritical pressure hydrocarbon fuel RP-3 flowing through horizontal vibrating tubes in transition and turbulent flow states were experimentally investigated. The effects of system pressure, heat flux, mass flow rate, inlet temperature, acceleration, and frequency on heat transfer with vibration were studied. The results showed that vibration significantly enhanced heat transfer in the entrance section, disturbed the development of thermal boundary layer, and promoted the transition of flowing state. The heat transfer enhancement became weaker with increasing Reynolds number and disappeared at Re > 12000. Furthermore, heat transfer was extremely enhanced at certain frequencies and displayed similar convective heat transfer trends along the tube at different x/d positions. A new heat-transfer empirical correlation describing the vibration effects on heat transfer was proposed based on the experimental results.
APPLIED THERMAL ENGINEERING
(2023)
Review
Thermodynamics
Abderrahmane Aissa et al.
Summary: This paper investigates and emphasizes the significance of combining the effect of employing nanofluids and turbulence generators in solar collectors to increase thermal performance and extract more usable solar energy.
APPLIED THERMAL ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
M. Sheikholeslami et al.
Summary: This article introduces a method to improve the efficiency of solar energy systems by using hybrid nanomaterials and special shape of turbulator in the pipe. The study found that inserting turbulator can increase radial velocity, disrupt isotherms, and enhance convective flow. Experimental results demonstrate the improvement of the performance of solar energy systems with this approach.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Thermodynamics
Yuan Fang et al.
Summary: The effect of using innovative turbulator geometry on heat transfer and pressure drop has been studied for the first time in this study. The findings show that these types of turbulators have a major impact on heat transfer and friction factor, with teardrop-shaped turbulators being the optimal choice.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
M. Sheikholeslami et al.
Summary: This study aimed to improve the productivity of a unit in an LFR system by using innovative swirl flow tapes and hybrid nanoparticles. The thermal feature of water was enhanced by dispersing Al2O3 + CuO nanoparticles. A solar unit was designed with 12 mirrors, one absorber tube, and a secondary reflector. SolTrace was used to calculate the heat source in the solid zone of the tube. The effects of inlet flow rate, temperature, pitch ratio, and height ratio were examined, and the inclusion of hybrid nanomaterial was found to enhance the Nusselt number, thermal productivity, and Darcy factor.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Thermodynamics
Aissa Abderrahmane et al.
Summary: This investigation analyzes the heat transport phenomena of non-Newtonian nanofluid in an annulus enclosure and finds that the composition of the nanofluid can enhance heat transfer. By manipulating parameters such as Rayleigh and Darcy numbers, power-law index, and magnetic forces, the heat transfer performance can be improved.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Weiguang Zhou et al.
Summary: This study investigates the effect of mechanical vibrations on the heat transfer performance of a horizontal tubular heat exchanger. The results show that lower vibration frequencies can significantly enhance the mixing and melting heat transfer rate of phase change material. However, the heat transfer enhancement weakens at medium to high vibration frequencies. The amplitude has a more significant impact on the heat transfer enhancement than the frequency.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Seyed Mahdi Seyed Mousavi et al.
Summary: This study analyzes heat and flow transfer in a double-pipe heat exchanger and optimizes its performance by using a new type of airfoil. The thermal performance is evaluated through experiments and computational fluid dynamics, and an optimal parameter combination is found. The results show that heat transfer is better at smaller Reynolds numbers, and an increase in thickness and pitch ratio results in higher friction factor and Nusselt number, thus improving the overall heat transfer performance.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Jaber Aboueian et al.
Summary: This study numerically investigates the impact of channel grooving on the energy and exergy efficiencies of a photovoltaic/thermal system. The results show that the efficiencies increase with the increase of groove pitch and silver nanoparticle concentration.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Chemistry, Physical
Yu Jiang et al.
Summary: This paper numerically investigates cooling of a cubic pack of nine cylindrical type lithium-ion batteries. The effects of parameters including the volume fraction of nanoparticles (NPs) and the height of the ducts on the cooling process are studied through simulations. The results show that an increase in the height of the ducts can decrease the temperature of the battery cells and increase the temperature of the output nanofluid, while increasing the duct height will continuously increase the heat transfer coefficient in the phase-change material (PCM).
JOURNAL OF POWER SOURCES
(2022)
Article
Nuclear Science & Technology
Ghassan Fadhil Smaisim et al.
Summary: This study investigates the effect of rotating twisted tape on fluid flow and heat transfer in a tube. The results show that increasing the Reynolds number and volume fraction of nanoparticles improves the heat transfer efficiency and pumping power.
PROGRESS IN NUCLEAR ENERGY
(2022)
Article
Thermodynamics
Jinguo Zhao et al.
Summary: In this study, three different heat transfer enhancement methods, including bubble injection, wavy strip turbulator utilization, and Nanofluid application, were used separately and simultaneously in a double tube heat exchanger. It was found that all three methods significantly increased heat transfer, and the simultaneous use of these methods achieved the best heat transfer performance.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Ghassan F. Smaisim et al.
Summary: The production of electric vehicles and their accessories is growing in the automotive industry. However, poor thermal management has led to thermal failures in batteries, which are the heart of these vehicles. To address this issue, looped heat pipes were used to transfer excessive temperature on batteries using nanofluids. The experiment results were validated using computational fluid dynamics.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Hazim Moria
Summary: This study investigated the effect of twisted tape turbulators and air injection on heat transfer enhancement. Results showed significant differences in flow patterns and notable increases in heat transfer and pressure drop with the presence of twisted tape turbulators. Air injection led to substantial increases in heat transfer coefficient and pressure drop, with the best cost per benefit ratio occurring at specific flow rates and turbulator configurations.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Materials Science, Ceramics
Zhiting Wei et al.
Summary: This study successfully synthesized a series of self-activated CaNb2O6 (CNO): Tb3+ phosphors and investigated their temperature-dependent persistent luminescence and color-tunable properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Thermodynamics
Amin Shahsavar et al.
Summary: A numerical analysis was conducted to evaluate the hydrothermal performance of a pin-fin mini-channel heatsink with six different inlet/outlet flow arrangements. Configurations with two inlets and outlets showed the best performance in terms of several parameters, but only at specific Re numbers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Review
Engineering, Environmental
Ben Wang et al.
Summary: Integrated pollutant removal technology, especially the Fenton-based method, has shown advantages in operation cost and application prospect compared to traditional methods such as wet flue gas desulfurization and selective catalytic reduction. The research in this area focuses on the catalytic mechanism of different metal-element doping catalysts for multi-air-pollutant removal. The industrialization prospects and feasibility of Fenton-based methods have been systematically analyzed in this paper, providing insights for future applications in pollutant removal.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Saman Pourahmad et al.
Summary: The study found that the Nusselt number increases with the decrease of turbulator ratio and increases with the increase of bubble injection flow rate, cold water flow rate, and Reynolds number. Moreover, simultaneous use of air bubble injection and dual twisted tape turbulator can significantly enhance the Nusselt number compared to using them individually or not using them at all.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Thermodynamics
M. Pimsarn et al.
Summary: The experiments investigated the thermohydraulic behaviors of heating tubes with serrated-ring bundles as turbulators. It was found that various geometries of serrated-ring bundles can enhance forced convection heat transfer by disrupting the laminar sub-layer and creating a reversing flow. Furthermore, decreasing the pitch ratio and serrated-ring diagonal angle resulted in increased heat transfer rate, friction loss, and improved thermohydraulic performance index.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Hussein A. Mohammed et al.
Summary: The study focused on the thermal-hydraulic performance of a PTSC receiver's tube equipped with conical turbulators, aiming to enhance thermal efficiency by using new advanced coolants. The findings showed that using Ag-SWCNT/Syltherm oil significantly augmented the thermal performance, leading to increased thermal and exergetic efficiencies.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Thermodynamics
Amin Shahsavar et al.
Summary: This paper evaluates thermal and frictional irreversibility rates in plate-pin-fin heatsinks, showing that frictional entropy generation rate is significantly lower than thermal term. Pin-fin with arched splitter has minimum thermal irreversibilities, with major irreversibilities found near pin-fin lateral and frontal surfaces, plate fin walls, heatsink upper case, and lower base. Increasing Reynolds number decreases thermal entropy generation rates and increases frictional entropy generation rates.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Energy & Fuels
Dongmin Yu et al.
SUSTAINABLE ENERGY GRIDS & NETWORKS
(2020)
Article
Energy & Fuels
Qian Xu et al.
Article
Green & Sustainable Science & Technology
Rufeng Zhang et al.
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
(2020)
Article
Thermodynamics
Qinghua Yu et al.
ENERGY CONVERSION AND MANAGEMENT
(2019)
Article
Materials Science, Multidisciplinary
Eda Feyza Akyurek et al.
RESULTS IN PHYSICS
(2018)
