Review
Engineering, Multidisciplinary
Mahmoud M. Selim, Sherif El-Safty, Abdelouahed Tounsi, Mohamed Shenashen
Summary: The emergence of nanofluids as high-efficiency thermal transfer media has sparked the interest of heat transfer researchers. Nanomaterials have been widely used in various industries, while magnetic nanoparticle-suspended nanofluids have attracted tremendous attention due to their technical and industrial applications. This research investigates the effects of an external magnetic field on nanofluids, focusing on the thermal conductivity and viscosity of magnet nanofluids.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Multidisciplinary Sciences
S. Suresh Kumar Raju
Summary: This study examines the effects of radiation and Ohmic heating on the dissipative flow of micropolar and hybrid nanofluid within an inclined channel. The primary flow equations are transformed into a system of NODEs using similarity conversions. The shooting method and fourth-order Runge-Kutta strategy are applied to obtain the desired results. The key findings of this study indicate that a larger pressure gradient reduces fluid velocity and a higher inertia parameter decreases the rotation profile for Newtonian fluid flow, but has the opposite effect for hybrid nanofluid flow. Increasing the Brinkmann number improves the fluid temperature, while the radiation parameter mitigates this effect. The Grashoff number enhances the Bejan number at the center of the channel but decreases it in other areas. Validation of the results shows good agreement with previous studies.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
Nessrin Manaa, Awatef Abidi, Ahamed C. Saleel, Jamel Madiouli, Mohammed Naceur Borjini
Summary: The study compares the performance of Cu-Al2O3/water micropolar hybrid nanofluid with Cu/water simple nanofluid in terms of heat transfer, showing that the micropolar nanofluid exhibits higher heat transfer rates in thermal buoyancy-dominated zones but leads to lower heat transfer rates in solutal-dominated regime.
HEAT TRANSFER ENGINEERING
(2021)
Article
Mathematics, Applied
H. B. Lanjwani, M. S. Chandio, M. Anwar, S. A. Shehzad, M. Izadi
Summary: In this study, time-dependent, two-dimensional magnetohydrodynamic micropolar nanomaterial flow over a shrinking/stretching surface near the stagnant point is investigated with consideration of mass and heat transfer characteristics. The equations are solved numerically using a shooting scheme in MAPLE software, revealing dual solutions with different physical parameters. The stability analysis indicates that the first solution is stable and physically feasible, while the second solution is unstable and infeasible. Additionally, the impact of various physical factors on drag force, skin-friction factor, and mass and heat transfer rates is determined and interpreted.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2021)
Article
Mathematics
Iskandar Waini, Anuar Ishak, Yian Yian Lok, Ioan Pop
Summary: This study examines the micropolar nanofluid flow in a stagnation region of a stretching/shrinking sheet and analyzes the heat transfer properties of the nanofluid through analytical and numerical methods. The results show that the micropolar parameter and magnetic parameter have significant effects on the fluid's friction coefficient and heat transfer coefficient. Additionally, the stability analysis and critical value study provide insights for optimizing the production process of specific products.
Article
Thermodynamics
Tariq Hussain, Hang Xu
Summary: In this study, numerical analysis was performed on the fluid model of an incompressible, time-dependent electrically conducting squeezing flow of a micropolar fluid. The thermal performance was discussed using the Buorngiorno nanofluid theory, while the suspended nanoparticles were sustained through bioconvection induced by the combined influence of magnetic field and buoyancy forces. The results showed the characteristics of velocity, temperature, concentration, and microorganism fields. It was observed that micropolar and magnetic parameters had opposite effects on the micro-rotation field. Furthermore, the Brownian motion and thermopheresis parameters had similar influences on the temperature profiles.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Anil Ahlawat, Mukesh Kumar Sharma, M. M. Rashidi, M. A. Sheremet
Summary: This study investigates optimal thermal convection and entropy production minimization in magnetohydrodynamic micropolar hybrid nanofluid flow through an annulus region bounded between an elliptical cylinder and a square cylinder with partially insulated and partially heated walls. Different configurations of heater placement were considered. The effects of various parameters on flow dynamics and convective heat transfer were analyzed.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Amin Nikelham, Vali Enjilela, Nima Vaziri, Zahra Poolaei Moziraji
Summary: This paper investigates forced convection of Al2O3-water nanofluid over a circular cylinder inside a magnetic field. The study uses the finite element method to discretize the fluid equations and analyzes the impact of various parameters on the Nusselt number and its relationship with the volume fraction of the nanofluid.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Shantanu Dutta, Sukumar Pati, Laszlo Baranyi
Summary: The study shows that the average Nusselt number increases with the volume fraction of nanoparticles and decreases with the Hartmann number. In addition to the influence of fluid properties and external conditions, the geometric variation of the enclosure volume also plays a role in altering the heat transfer rate.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Fethi Murat Altunay, Hayati Kadir Pazarliog, Mehmet Guerdal, Mutlu Tekir, Kamil Arslan, Engin Gedik
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
Multidisciplinary Sciences
Zafar Mahmood, Sharifah E. Alhazmi, Awatif Alhowaity, Riadh Marzouki, Nadir Al-Ansari, Umar Khan
Summary: This research investigates the impact of nanoparticle aggregation on MHD mixed convective stagnation point flow by using a thermally stratified water-based nanofluid and a permeable stretching sheet as a simulation environment. It utilizes two modified models to study nanoparticle aggregation and achieves numerical solutions using the shooting with Runge-Kutta Fehlberg technique. The study shows that the nanoparticle volume fraction affects the existence range of solutions and that alumina and copper nanofluids have better heat transfer properties. The comparison with previous results demonstrates excellent agreement.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Khalid Abdulkhaliq M. Alharbi, Zeeshan Khan, Samina Zuhra, Saeed Islam, Aatif Ali, Elsayed Tag-Eldin, Samy Refahy Mahmoud
Summary: The current research investigates the behavior of bioconvection micropolar nanofluid on a stretching surface under the influence of thermal radiation, stratification, and heat and mass transmission. The findings from this study are significant for evaluating the impact of key design factors on heat transfer and optimizing industrial processes.
Article
Engineering, Multidisciplinary
Nepal Chandra Roy
Summary: This study investigates the natural convective flow and heat transfer of a hybrid nanofluid in an enclosure with multiple heat sources at the bottom wall, under the influence of a magnetic field applied at an angle with the horizontal axis. The results reveal that the flow pattern and heat transfer characteristics are significantly influenced by the magnetic field parameter, angle of magnetic field, number and breadth of heat sources, and Rayleigh number. Higher Rayleigh numbers and smaller magnetic field parameters result in stronger stream function intensity. Moreover, the volume fraction of Cu nanoparticles affects the streamlines and isotherms, showing distinct patterns. The average Nusselt number increases with the increase of heat sources, magnetic field angle, and Rayleigh number.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Mahdi Parviz, Hossein Ahmadi-Danesh-Ashtiani, Alireza Saraei, Hossein Afshar
Summary: This paper investigates the forced convection of ferro-nanofluid in a U-shaped tube subjected to a magnetic field. The study considers three different bending radii and varying volume fractions of Fe3O4 particles. The results show that the current density and coefficient of friction increase with the Hartmann number, and the presence of a magnetic field reduces the fluid flow velocity. Additionally, the heat transfer rate is more significantly affected by the flow velocity rather than the magnetic field intensity, and increasing the bending radius leads to a further reduction of fluid energy.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
P. M. Patil, Bharath Goudar, E. Momoniat
Summary: The current study investigates the impact of a magnetic field and oxytactic microorganisms on the flow of a micropolar nanofluid around a wedge. It has practical implications in various industries and fields. The analysis involves transforming the governing equations, linearization, and discretization. Previous studies have only considered similarity solutions without considering oxytactic microorganisms.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Darya Loenko, Aroon Shenoy, Mikhail Sheremet
Summary: This study focuses on the mathematical modeling of passive cooling systems for electronic devices and analyzes the impact of the position of the heat-generating element and the tilt angle of the electronic cabinet on thermal convection of non-Newtonian fluids. By analyzing streamlines, isotherms, and average Nusselt numbers, the study found that better cooling occurs when the cavity is filled with a pseudoplastic fluid and is not inclined.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
Jawali C. Umavathi, Mikhail A. Sheremet
Summary: The study examines mixed convection in vertical parallel channels with viscous fluid sandwiched between nanofluids within porous material, using single-phase transport concept for nanofluid flow and heat transfer. The Darcy approach is employed to describe circulation within the porous material. Non-linear differential equations and boundary conditions are solved to investigate the effects of various parameters on velocity and temperature fields, along with evaluating physical characteristics such as skin friction and heat transfer rates for different nanoparticles materials.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
A. Alsabery, A. Hajjar, M. A. Sheremet, M. Ghalambaz, I Hashim
Summary: The analysis focuses on the computational study of nanosuspension forced convection in a horizontal wavy channel with heating from the upper wavy surface. The use of nanofluids and irregular channels can enhance energy transport and heat removal. Increasing Reynolds number leads to a narrowing of fluid tube within the channel and improvement of average velocity and Nusselt number, while higher channel waviness number results in increased average particle velocity and temperature.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Stepan Mikhailenko, Mohammad Ghalambaz, Mikhail A. Sheremet
Summary: This study investigated the simulation of convective-radiative heat transfer in a rotating square chamber with a variable thermally generating source. The results showed that increasing surface emissivity can reduce heater temperature, and slight rotation can enhance energy transport under low thermal generation frequency. The study provided insights for analyzing complex heat transfer in rotating systems with internal heat-generating units, benefiting scientists and engineers in various industrial sectors.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Biochemistry & Molecular Biology
Mohammad Ghalambaz, Seyed Abdollah Mansouri Mehryan, Ahmad Hajjar, Obai Younis, Mikhail A. Sheremet, Mohsen Saffari Pour, Christopher Hulme-Smith
Summary: Thermal energy storage with metal foam can improve charging speed by optimizing nanoparticle concentration and foam properties. The height and porosity of the foam layer are the dominant factors in enhancing the effectiveness of the storage unit. Incorporating copper foam into the design can mitigate charge leakage and improve heat transfer rates.
Article
Thermodynamics
Sivaraj Chinnasamy, E. Vignesh, Mikhail Sheremet
Summary: The study investigates magnetohydrodynamics thermal convection energy transference and entropy production in an open chamber saturated with ferrofluid containing an isothermal solid block. Numerical simulations show that increasing the Hartmann number can decrease entropy generation rate and mean Nusselt number, while the addition of nano-sized particles results in increased energy transport and mean entropy generation.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Darya S. Loenko, Aroon Shenoy, Mikhail A. Sheremet
Summary: This paper presents the computational analysis of unsteady natural convection of a non-Newtonian fluid in an enclosure, considering the time sinusoidal dependence of the wall temperature. The results show the impact of fluid properties and wall temperature oscillation frequency on convective heat and mass transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
M. S. Astanina, Bernardo Buonomo, Oronzio Manca, M. A. Sheremet
Summary: The study focuses on investigating the transient natural convective heat transfer of a temperature-dependent viscosity liquid inside an inclined cube, with a time-dependent temperature profile on one vertical surface. It examines the impacts of wall temperature oscillation frequency and domain tilted angle on energy transport and flow structures. The research highlights the significant influence of these factors on convective energy transport in the system.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Vemula Rajesh, Mandava Srilatha, Mikhail A. Sheremet
Summary: This study investigates the effects of temperature oscillation and Lorentz force on the two-dimensional transient hybrid nanofluid boundary layer motion. Numerical simulations and graph analyses are used to explore the influence of magnetic parameter, Grashof number, phase angle, and nanoparticles concentration on thermal and hydrodynamic structures. The results show that increasing nanoparticle volume fraction reduces the friction parameter and enhances energy transport strength.
Article
Physics, Multidisciplinary
Zafar H. Khan, Waqar A. Khan, Mikhail A. Sheremet, Jiguo Tang, Licheng Sun
Summary: The study utilized the entropy generation minimization approach to analyze different porous cavities, revealing variations in total entropy generation strength among chambers of different shapes. The influence of motion friction on total entropy generation was found to be negligible.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Thermodynamics
Marina S. Astanina, Bernardo Buonomo, Oronzio Manca, Mikhail A. Sheremet
Summary: This article conducts numerical simulation of thermogravitational convection in medium with dependent viscosity, controlled by non-dimensional vector potential functions, vorticity vector, and temperature. The influence of third coordinate, Rayleigh number, and viscosity variation parameter on thermal distribution, flow structures, and mean Nusselt number is demonstrated through comparisons. The obtained outcomes suggest that for the 3D problem considered, evaluation of mean Nusselt number can be performed using 2D data when the aspect ratio is greater than or equal to unity.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Mathematics, Applied
Darya S. Loenko, Aroon Shenoy, Mikhail A. Sheremet
Summary: This research focuses on the numerical analysis of natural convection in a cavity filled with a non-Newtonian nanosuspension under the influence of a heat-generating wall section. The study shows that adding nanosized particles to heat transfer liquids can enhance heat removal from heated elements in electronic devices, and different boundary conditions result in different temperature patterns.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Thermodynamics
Hussain Basha, Sreenivasulu Ballem, G. Janardhana Reddy, Harish Holla, Mikhail A. Sheremet
Summary: With a two-dimensional numerical model, this study investigates the impact of buoyancy forces on magnetized free convective Walters-B fluid flow over a stretching sheet. The results show that increasing the viscoelastic parameter decreases the velocity profile while enhancing the thermal and concentration fields. On the other hand, increasing the free convection parameters leads to the opposite effect.
Article
Thermodynamics
Nadezhda S. Bondareva, Mikhail A. Sheremet
Summary: This study presents a computational analysis of natural convection melting in a multi-PCM thermal sink and examines the influence of geometric parameters and material arrangements in the system. The results show that vertical flat fins provide lower temperatures and longer melting times despite their smaller surface area when the heat source is located below.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Physics, Multidisciplinary
Amit Kumar, Rajendra K. Ray, Mikhail A. Sheremet
Summary: This study focuses on swirling flow of nanoliquid over a radially stretchable rotating disk, considering nonlinear mixed convection and chemical reaction defined by Arrhenius model, as well as imperfect liquid-solid energy interaction and Navier's velocity slip condition. A flow model is established using Buongiorno's nanofluid model, with outcomes showing that increased magnetic and slip parameter values decrease fluid velocities while improving entropy generation with higher Brinkman number or magnetic parameter values. The coupled nonlinear partial differential equations are transformed to non-dimensional ordinary differential equations and solved using bvp4c technique, presenting results graphically and in tabular forms for surface drag force, energy, and mass transport.
INDIAN JOURNAL OF PHYSICS
(2022)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
