4.7 Article

Parametric analysis of different Al2O3 nanoparticle shapes and expansion angles for sudden expanded tube regarding the first law of thermodynamics

相关参考文献

注意:仅列出部分参考文献,下载原文获取全部文献信息。
Article Thermodynamics

Exergetic, Energetic, and entropy production evaluations of parabolic trough collector retrofitted with elliptical dimpled receiver tube filled with hybrid nanofluid

Hayati Kadir Pazarlioglu et al.

Summary: A numerical study was conducted on a parabolic trough collector receiver tube with elliptical dimpled fins to analyze its hydro-thermal characteristics under turbulent flow regime. Different mono and hybrid nanofluids with various nanoparticle volume fractions were used as the working fluid. The study provides a detailed analysis of the collector's exergetic and entropy production. The results show that the use of elliptical dimpled fins with an elliptical ratio of a/b=5/3 significantly increases the average Nusselt number, reduces entropy generation, and improves thermal efficiency.

APPLIED THERMAL ENGINEERING (2023)

Article Engineering, Mechanical

The first and second law analyses of thermodynamics for CoFe2O4/H2O flow in a sudden expansion tube inserted elliptical dimpled fins

Hayati Kadir Pazarlioglu et al.

Summary: This study computationally investigated the thermo-hydraulic performance and entropy generation of a sudden expansion tube with elliptical dimpled fins. The results showed that the use of elliptical dimpled fins can enhance the convective heat transfer rate and decrease the total entropy generation.

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES (2023)

Article Thermodynamics

Heat transfer and flow characteristics in symmetric and parallel wavy microchannel heat sinks with porous ribs

Shuo-Lin Wang et al.

Summary: Based on the synergistic design concept, double-layered microchannel heat sinks with parallel and symmetric wavy porous fins were developed for pressure drop reduction, heat transfer enhancement, and cooling uniformity improvement. Numerical studies showed that the porous-fin design significantly improved heat transfer performance and reduced pressure drop. The symmetric configuration yielded a higher pressure drop reduction, while the parallel configuration provided higher thermal performance.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES (2023)

Article Materials Science, Multidisciplinary

An innovative approach of alternating magnetic field diversified with different wave types and magnet positions for ferrofluid flow in dimpled tube

Mehmet Gurdal et al.

Summary: The purpose of this experimental study is to investigate forced magneto-convection in Fe3O4/H2O ferrofluid flowing through smooth and dimpled tubes with an alternating magnetic field (B = 0.16 T and f = 5 Hz). Experiments were conducted using pure water and a 1.0% volume fraction of ferrofluid in the laminar flow regime (1131 ≤ Re ≤ 2102). A unique aspect of this study is the use of different magnetic field wave types (Sinus, Triangle, and Square) and positions at different axial distances (x/D = 20, x/D = 40, and x/D = 60). The findings show that the highest convective heat transfer ratio occurred at x/D = 20 with a square wave type for all cases. The average Nusselt number of the dimpled tube subjected to a square wave type applied at x/D = 20 increased by 58.13% compared to a smooth tube without a magnetic field and using H2O as the working fluid. Moreover, when comparing the friction factor under the same conditions, the increment rate was 85.73%. Although the Nusselt number reached its highest level with a square wave type, the highest Performance Evaluation Criteria of 1.45 was achieved using a dimpled tube subjected to an alternating magnetic field with a triangle wave type applied at x/D = 20 for Re = 1131.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS (2023)

Article Thermodynamics

Numerical investigation on turbulent flow and heat transfer characteristics of ferro-nanofluid flowing in dimpled tube under magnetic field effect

Mehmet Gurdal et al.

Summary: This study is the first numerical study to comprehensively determine the effect of using nanofluid, MagnetoHydroDynamic (MHD), and dimpled fins tube together. The results show that the Nusselt number increases with increasing Reynolds number and decreasing pitch ratio, with the dimple geometry type of P/d = 7.50 being the most efficient type. The highest Nusselt number increment has been obtained for the highest magnetic field intensity and the highest PEC value was obtained for specific parameters, indicating the potential for highly efficient thermal energy storage devices.

APPLIED THERMAL ENGINEERING (2022)

Article Thermodynamics

Heat transfer augmentation in a tube with conical wire coils using a mixture of ethylene glycol/water as a fluid

Orhan Keklikcioglu et al.

Summary: The experimental analysis of using convergent, convergent-divergent and divergent conical wire coils in the ethylene glycol and water mixture flow region showed that the conical wire coils enhance both heat transfer rate and fluid friction. New correlations were developed to predict Nusselt number and friction factor, making these configurations a potential technique to increase thermohydraulic performance in engineering applications.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES (2022)

Article Multidisciplinary Sciences

Trends in surface equivalent potential temperature: A more comprehensive metric for global warming and weather extremes

Fengfei Song et al.

Summary: The trend in surface equivalent potential temperature (Thetae_sfc) is a more comprehensive metric for global warming and weather extremes compared to surface air temperature (SAT) since it accounts for the increase in atmospheric humidity and latent energy. Observations show that Thetae_sfc has increased more globally and in the tropics compared to SAT, with water vapor being responsible for the difference between the two trends. The trend in Thetae_sfc is strongly correlated with heat extremes and extreme precipitation.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2022)

Article Thermodynamics

Heat transfer improvement between a pair of heater and cooler inside an energy storage by using nano-encapsulated phase change material/water: A numerical modeling

Yan Cao et al.

Summary: This study simulated the natural convection flow of water with Nano-encapsulated phase change material (NPCM) in an insulated chamber. The effects of Rayleigh number, volume fraction, and location of phase change zone on the convective heat transfer coefficient were investigated. It was found that phase change of NPCM occurred at low Rayleigh numbers and was directly related to the thermal conductivity of the mixture. Increasing the volume fraction of NPCM in water significantly enhanced the convective heat transfer coefficient.

CASE STUDIES IN THERMAL ENGINEERING (2022)

Article Thermodynamics

An automotive radiator with multi-walled carbon-based nanofluids: A study on heat transfer optimization using MCDM techniques

Vinothkumar Sivalingam et al.

Summary: In this study, multi-criteria decision-making (MCDM) techniques were used to predict the performance of automobile radiators using multiwall carbon nanotubes (MWCNTs)-based nanofluid under different operating conditions. The thermal transport properties of the nanofluid were experimentally measured and regression analysis was performed to identify the important factors affecting thermal transfer. The results showed that the MCDM technique identified the optimum parameters for enhancing thermal transfer with the automobile radiator.

CASE STUDIES IN THERMAL ENGINEERING (2022)

Article Engineering, Mechanical

Failure analysis of waste heat boiler tubing caused by a high local heat flux

Suwarno Suwarno et al.

Summary: This study reports a new failure mechanism of waste heat boiler (WHB) tubes, which failed due to excessive oxidation. A computational model reveals the flow recirculation that leads to excessive oxidation. This study is of great importance for developing heat exchanger designs and exploring damage mechanisms.

ENGINEERING FAILURE ANALYSIS (2022)

Article Thermodynamics

Heat transfer augmentation in a double-pipe heat exchanger with dimpled twisted tape inserts: an experimental study

Mohammad Mohsen Soltani et al.

Summary: The effect of the geometrical structure of dimpled twisted tape inserts in the inner pipe of a double-pipe heat exchanger on heat transfer performance was experimentally investigated. The results showed that the dimpled twisted tape inserts significantly enhanced heat transfer and friction effect, and under the same conditions, they exhibited better heat transfer performance compared to non-dimpled twisted tape inserts.

HEAT AND MASS TRANSFER (2022)

Article Thermodynamics

Heat transfer enhancement in Marangoni convection and nonlinear radiative flow of gasoline oil conveying Boehmite alumina and aluminum alloy nanoparticles

Ikram Ullah

Summary: This study presents an analysis of the Marangoni convection flow of hybrid nanomaterials in an infinite porous disk. The hybrid nanomaterials consist of gamma ALOOH and AA7075 nanoparticles, and gasoline oil is used as the base liquid. The Darcy-Forchheimer law is employed and the thermal field on the disk surface is assumed to vary quadratically. The effects of irregular heat source, radiation, and dissipation are also taken into account. The system is dimensionless using Von Kamran variables and the NDsolver scheme is used to approximate the reduced system. Various physical variables such as surface temperature gradient, temperature, and velocity are analyzed through graphs and tables. It is found that hybrid nanomaterials exhibit the highest thermal conductivity compared to traditional liquid and nanoliquid.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2022)

Article Thermodynamics

Implementation of hybrid nanofluid flowing in dimpled tube subjected to magnetic field

Mehmet Gurdal et al.

Summary: This study investigated the effect of hybrid nanofluid flow in a dimpled tube under the influence of a magnetic field on convective heat transfer. It is concluded that implementing a magnetic field enhances the Nusselt number and friction factor in the flow. The results show that the hybrid nanofluid flow in the dimpled tube with a magnetic field of 0.3 T can increase the Nusselt number by 11.87% and the friction factor by 6.19% numerically, and by 174.65% and 169.4% experimentally compared to the case without a magnetic field.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2022)

Article Thermodynamics

A novel empirical equation for the effective viscosity of nanofluids based on theoretical and empirical results

Mohamad Klazly et al.

Summary: This paper reviews the theoretical, numerical, and experimental viscosity correlations of nanofluids and proposes a new correlation that can predict the effective viscosity of nanofluids by considering several factors that significantly affect viscosity.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2022)

Review Thermodynamics

Flow and heat transfer in swirl tubes-A review

Florian Seibold et al.

Summary: This article provides a review of cyclone cooling technology in gas turbines, including flow field and heat transfer evaluation. Through comparative analysis of various design features, the advantages of cyclone cooling systems over traditional techniques are revealed. Additionally, the predictability of different turbulence modeling approaches is assessed, and open questions for future research in cyclone cooling are discussed.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

Article Engineering, Environmental

Experimental investigation on shock wave propagation and self-ignition of pressurized hydrogen in different three-way tubes

La Ta et al.

Summary: This study experimentally investigated the propagation characteristics of shock waves and self-ignition produced by the release of high-pressure hydrogen in three-way tubes. The results showed that the intensity of shock waves varied during the release process, and the occurrence of self-ignition was influenced by both the enhancement and attenuation effects of the shock waves. The critical release pressure for self-ignition decreased with increasing bifurcation angle in the three-way tubes.

PROCESS SAFETY AND ENVIRONMENTAL PROTECTION (2022)

Article Thermodynamics

Energy analysis of magnetite nanofluid flowing in newly designed sudden expansion tube retrofitted with dimpled fin

Emrehan Guersoy et al.

Summary: The sudden expansion geometry is crucial in engineering applications like heat exchangers, where nanofluid and expanded surfaces can be used to improve performance. This study numerically investigates forced convection of magnetite nanofluid flow in different expansion ratios, showing that the Nu number increases with Reynolds number and the highest PEC value is obtained at φ=2.0 vol.%.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

Review Green & Sustainable Science & Technology

Effects of using nanofluid, applying a magnetic field, and placing turbulators in channels on the convective heat transfer: A comprehensive review

Mehmet Gurdal et al.

Summary: Recent studies in thermal engineering found that there is little research on employing nanofluid as a working fluid in a specific channel while considering both turbulators and magnetic field effect. This review focuses on the single and combined effects of nanofluid type, volume fraction, channel and turbulator geometry, magnetic field type, and flow regime on the heat transfer enhancement of these systems.

RENEWABLE & SUSTAINABLE ENERGY REVIEWS (2022)

Article Thermodynamics

Novel usage of the curved rectangular fin on the heat transfer of a double-pipe heat exchanger with a nanofluid

Bahram Jalili et al.

Summary: This study investigates the convection heat transfer in a countercurrent double-tube heat exchanger with various fins, comparing the performance with simple and rectangular-finned geometries. The results show that the water-aluminum oxide nanofluid has a better convection heat transfer coefficient than water-titanium dioxide and pure water. Heat exchangers with rectangular and curved fins have significantly better efficiency than the heat exchanger without a fin.

CASE STUDIES IN THERMAL ENGINEERING (2022)

Article Thermodynamics

Thermal performance of Fe3O4/water nanofluid flow in a newly designed dimpled tube under the influence of non-uniform magnetic field

Fethi Murat Altunay et al.

Summary: The effects of alternating and constant magnetic fields on heat transfer characteristics of nanofluid flow in a dimpled tube have been investigated in this experimental study. The results show that the dimpled tube significantly enhances the Nusselt number and friction factor compared to the smooth tube. The constant magnetic field contributes to the enhancement of Nusselt number, while higher frequencies of the alternating magnetic field result in higher thermal performance.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES (2022)

Article Thermodynamics

Heat transfer enhancement by a sinusoidal wavy plate having punched triangular vortex generators

Sinan Caliskan et al.

Summary: The impact of punched triangular longitudinal vortex generators and sinusoidal wavy plates on convective heat transfer was investigated using various approaches. Experimental results showed that the vortex generators, sinusoidal structure, and punched hole significantly improved the thermal performance. The Taguchi technique was utilized to reduce the number of trials and determine the optimal conditions for heat transfer.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES (2022)

Article Thermodynamics

Experimental and CFD analysis of dimple tube parabolic trough solar collector (PTSC) with TiO2 nanofluids

M. Arun et al.

Summary: This research analyzed the performance of a parabolic trough solar collector with a dimple tube and TiO2/DI-H2O nanofluid using computational fluid dynamics. The results showed that using nanofluids can significantly enhance the efficiency and convective heat transfer coefficient of the solar collector.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2022)

Article Thermodynamics

Effects of trapezoidal and twisted trapezoidal tapes on turbulent heat transfer in tubes

Aziz Hakan Altun et al.

Summary: The trapezoidal and twisted trapezoidal tape elements used for heat transfer enhancement in tubes were experimentally investigated, analyzing their effects on heat transfer, pressure drop, and overall performance factor. The experimental results showed that the twisted trapezoidal tape elements had excellent heat transfer performance and overall performance factor.

APPLIED THERMAL ENGINEERING (2022)

Article Thermodynamics

Thermo-hydraulic analysis and optimization of CuO/water nanofluid inside helically dimpled heat exchangers

Mahdi Deymi-Dashtebayaz et al.

Summary: This work presents a comprehensive thermo-hydraulic parametric study and optimization of CuO/water nanofluid flow inside dimpled heat exchangers. The results show that among the decision parameters, the average flow temperature and the pitch ratio have the lowest and highest effect on entropy generation, respectively. The optimization process resulted in optimum values for Reynolds number, dimensionless average flow temperature, nanofluid concentration, and pitch ratio.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2021)

Article Thermodynamics

Effect of hybrid nanofluid on heat transfer performance of parabolic trough solar collector receiver

Recep Ekiciler et al.

Summary: This study investigates the three-dimensional heat transfer and flow characteristics of different hybrid nanofluids in a parabolic trough solar collector receiver under turbulent flow conditions. Results show that hybrid nanofluids outperform the base fluid in terms of heat transfer and flow features, with heat transfer enhancement correlated to Reynolds number and nanoparticle volume fraction. Among the tested nanofluids, Ag-MgO/Syltherm 800 with 4.0% nanoparticle volume fraction is identified as the most efficient working fluid for the PTC receiver.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2021)

Article Thermodynamics

Numerical investigation of heat transfer and pressure drop characteristics in the micro-fin helically coiled tubes

E. Pavan Kumar et al.

Summary: The study investigates heat transfer and pressure drop characteristics in micro-fin helically coiled tubes using numerical methods. Increasing the number of fins and Reynolds number results in higher Nusselt number and pressure drop, while coil diameter and pitch have minimal impact on Nusselt number. Micro-fin helical coiled tubes with fins outperform smooth tubes in terms of heat transfer and pressure drop.

APPLIED THERMAL ENGINEERING (2021)

Article Thermodynamics

An innovative design of a high strength and low weight sudden micro expansion by considering a nanofluid: Electronic cooling application

Mohammad Reza Safaei et al.

Summary: This study numerically investigated the effects of different expansion angles on heat transfer and pressure drop characteristics in a microtube sudden expansion. The findings showed that a sudden expansion with a 45-degree angle had the optimum hydrodynamic performance while a 30-degree angle resulted in the lowest pressure drop.

CASE STUDIES IN THERMAL ENGINEERING (2021)

Article Engineering, Electrical & Electronic

Numerical and Experimental Investigation of Flow and Heat Transfer in Heat Exchanger Channels with Different Dimples Geometries

Pingting Ying et al.

Summary: The study analyzed the flow characteristics and heat transfer performance in heat exchanger channels with different dimple geometries. It was found that dimples cause downward flow, improve flow mixing and reattachment, interrupt the boundary layer, and greatly enhance heat transfer. Hemispherical dimple channels showed the highest heat transfer coefficient and overall thermal performance compared to traditional rhombus dimple channels.

MACHINES (2021)

Article Thermodynamics

Effect of shape of nanoparticle on heat transfer and entropy generation of nanofluid-jet impingement cooling

Recep Ekiciler et al.

INTERNATIONAL JOURNAL OF GREEN ENERGY (2020)

Article Thermodynamics

Flow Structure and Heat Transfer Characteristics of a Rectangular Channel With Pin Fins and Dimples With Different Shapes

Lei Luo et al.

JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS (2019)

Article Thermodynamics

Effects of nanoparticle shapes on laminar forced convective heat transfer in curved ducts using two-phase model

Fang Liu et al.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2018)

Article Thermodynamics

Effectiveness in incorporating Brownian and thermophoresis effects in modelling convective flow of water-Al2O3 nanoparticles

M. Ziad Saghir et al.

INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW (2018)

Article Computer Science, Interdisciplinary Applications

Numerical analysis of laminar and transitional flow in a planar sudden expansion

N. Moallemi et al.

COMPUTERS & FLUIDS (2016)

Article Thermodynamics

Numerical simulation of heat transfer and separation Al2O3/nanofluid flow in concentric annular pipe

Hussein Togun et al.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2016)

Article Thermodynamics

Heat transfer and flow analysis of Al2O3-water nanofluids in microchannel with dimple and protrusion

Ping Li et al.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2014)

Article Computer Science, Interdisciplinary Applications

LATTICE-BOLTZMANN SIMULATIONS OF FLOWS OVER BACKWARD-FACING INCLINED STEPS

Rupesh B. Kotapati et al.

INTERNATIONAL JOURNAL OF MODERN PHYSICS C (2014)

Article Chemistry, Physical

Effect of nanoparticle shapes on the heat transfer enhancement in a wavy channel with different phase shifts

Sh. M. Vanaki et al.

JOURNAL OF MOLECULAR LIQUIDS (2014)

Article Thermodynamics

Numerical simulation of flows over 2D and 3D backward-facing inclined steps

Petr Louda et al.

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW (2013)

Article Thermodynamics

Effect of Al2O3-Cu/water hybrid nanofluid in heat transfer

S. Suresh et al.

EXPERIMENTAL THERMAL AND FLUID SCIENCE (2012)

Article Thermodynamics

Heat transfer enhancement of nanofluids flow in microtube with constant heat flux

B. H. Salman et al.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2012)

Article Physics, Applied

Particle shape effects on thermophysical properties of alumina nanofluids

Elena V. Timofeeva et al.

JOURNAL OF APPLIED PHYSICS (2009)

Article Thermodynamics

Three-dimensional convection flow adjacent to inclined backward-facing step

Y. T. Chen et al.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2006)

Article Physics, Applied

Role of Brownian motion in the enhanced thermal conductivity of nanofluids

SP Jang et al.

APPLIED PHYSICS LETTERS (2004)