Article
Engineering, Chemical
Luke H. Macfarlan, Mikey T. Phan, R. Bruce Eldridge
Summary: This study developed a novel interfacial mass transfer model capable of handling concentration jumps across two fluid interfaces. The model was validated on a two-dimensional system with different chemical systems. The predictions of the model agreed with the analytical solution within 1 percent. The study also provided a framework for combining the model with a Reynolds-averaged Navier Stokes approach.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Multidisciplinary
Mohammad Ebadi, James Mcclure, Peyman Mostaghimi, Ryan T. Armstrong Australia
Summary: In this study, an extended model for multiphase flow in porous media based on first principles is proposed. The advantages of the extended model, including real-time tracking of specific interfacial area, are demonstrated through comparisons with traditional models and analytical solutions. Sensitivity and stability analyses reveal the importance of the balance between permeability of the porous media and interfacial permeability. The extended model offers a better understanding of the evolution of specific interfacial area during multiphase flow.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
Article
Mechanics
Cheng-Hsien Lee
Summary: This study developed a multiphase model with a novel evolution equation to address the issues of shear-induced volume change and pore-pressure feedback in submarine granular flows simulated using an Eulerian-Eulerian two-phase model. The evolution equation effectively describes the relaxation process of static solid pressure and shear-induced volume change, allowing the model to capture phenomena such as time delays in initiating flows and different collapse processes for differently packed columns.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Environmental
Hongye Li, Xunli Zhang, Qingqiang Wang, Nan Jin, Haisheng Wei, Yuchao Zhao
Summary: This study employed Pickering emulsion to enhance the oxidation of benzyl alcohol catalyzed by Pd/SiO2 nanoparticles in a microchannel reactor. The experimental results showed that the O/W Pickering emulsion system was superior to the W/O system for the catalytic oxidation reaction. The optimized reaction conditions included a reaction temperature of 403 K, a CB of 5 wt%, an O2/BNOH ratio of 0.76, and a tube length of 8 m. Under these conditions, the conversion of BNOH and the selectivity of benzaldehyde were found to be 86.53% and 99.79%, respectively. The study provides important insights for effectively performing multiphase catalytic reactions involving solid catalyst particles in microchannel reactors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Le Sang, Qiang Cao, Bingqi Xie, Chi Ma, Jisong Zhang
Summary: The study evaluated the gas-liquid mass transfer performance in micropacked bed reactors using CO2-NaOH solution chemisorption, excluding the influence of mixing heads. The results showed that the effective interfacial area in mu PBRs is significantly larger compared to bubble reactors and trickle bed reactors, providing valuable insights for mass transfer enhancement in mu PBRs.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Mechanics
Yan Xia, Zhaosheng Yu, Zhaowu Lin, Yu Guo
Summary: This study establishes correlations between the interfacial terms and the fluid dissipation rate equation and Reynolds stress equations in particle-laden flows, providing an accurate mathematical model and method for simulating particle-induced turbulence.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Xinlei Qi, Shenghui Liu, Zhengliang Yu, Hedong Sun, Baohua Chang, Zhengyuan Luo, Bofeng Bai
Summary: This study delves into the dynamics of gas-water displacement in fractured porous media using a microfluidic device, revealing that the invasion pattern and interface morphology vary under different pressure conditions. A theoretical model was successfully established to predict the interfacial velocity of gas-water displacement under high pressure, providing valuable insights for preventing water invasion in natural gas reservoirs.
Article
Engineering, Chemical
Hariswaran Sitaraman, James Lischeske, Yimin Lu, Jonathan Stickel
Summary: This study develops and validates a computational model for reacting multiphase flows in large-scale bioreactors, addressing the challenges of controlling oxygen distribution and optimizing large-scale production of 2,3 butanediol. The coupled approach demonstrated a 25% improvement in BDO yield compared to the baseline condition.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Thermodynamics
Clement Roy, James F. Klausner, Andre Benard
Summary: The study shows that increasing water spray density can significantly increase liquid hold-up and evaporated mass, while gas distribution has a negligible impact on the performance of the evaporator. The insight provided by the CFD model highlights the importance of considering the water distributor in conjunction with the packed column design for improving performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Haibo Li, Maocheng Tian, Min Wei, Jingzhi Zhang
Summary: This study numerically investigates the direct-contact condensation (DCC) and boiling issues using the Lee model. A new mass transfer coefficient correlation is proposed and its accuracy is confirmed through experimental results. The study reveals that the mass transfer rate causes velocity fluctuations at the interface, affecting the condensation mass transfer rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Linfeng Piao, Hyungmin Park
Summary: This study experimentally investigates the interfacial instabilities in a cylindrical container oscillating about its axis with two immiscible liquids, oil and water. The thresholds for the onset of different instabilities responsible for each regime are presented by the amplitude and frequency of rotation, with viscosity playing an important role in shaping the boundary of SD and multiple-droplet regimes.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Jeff T. Gostick, Niloofar Misaghian, Jianhui Yang, Edo S. Boek
Summary: A new algorithm for simulating volume-controlled invasion of a non-wetting phase into voxel images is presented, offering advantages over traditional pressure-based invasion methods. By incrementally increasing saturation, the algorithm allows for accurate prediction of defending phase trapping and provides a capillary pressure curve with characteristic jumps. Results show that the proposed method is a superset of the morphological approach and can achieve similar results to multiphase lattice Boltzmann simulations in less time.
COMPUTERS & GEOSCIENCES
(2022)
Article
Mechanics
Xuan Ruan, Sheng Chen, Shuiqing Li
Summary: The study investigates the early-stage agglomeration of identically charged microparticles in homogeneous isotropic turbulence through numerical simulations. It is found that as particle charge increases, the collision frequency changes, and the dominant collision mechanism shifts. In the presence of both Coulomb repulsion and adhesion, particles with moderate collision velocities are more likely to contribute to agglomerates formation.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Manuel Moriche, Daniel Hettmann, Manuel Garcia-Villalba, Markus Uhlmann
Summary: We conducted numerical simulations of heavy non-spherical particles settling under gravity and observed that oblate spheroids form columnar clusters, resulting in enhanced settling velocity. The behavior of many-particle cases is not qualitatively different from single-particle cases, contrary to previous results for spheres. We also analyzed pairwise interactions of oblate spheroids and spheres, finding similar attraction regions but noticeable differences during drafting and tumbling phases, including longer drafting phases and more collision events for free-to-rotate spheroids.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Engineering, Chemical
Conrado P. Zanutto, Emilio E. Paladino, Fabien Evrard, Berend van Wachem, Fabian Denner
Summary: This work introduces a numerical model based on a single-field formulation and the algebraic Volume-of-Fluid (VOF) method for predicting interfacial heat and mass transfer, as well as the investigation of the Compressive Continuous Species Transfer (C-CST) model.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Mechanical
Syed Ahsan Sharif, Mark Kai Ming Ho, Victoria Timchenko, Guan Heng Yeoh
Summary: In this paper, the growth of a rising vapor bubble in superheated water was numerically studied using an advanced interface tracking method. The simulation considered convective heat transfer and phase-change mechanisms. The results showed good agreement with analytical and past works.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Mathematics, Interdisciplinary Applications
Darson D. Li, Qing N. Chan, Victoria Timchenko, Guan H. Yeoh
Summary: A computational model is developed to evaluate two novel strategies in controlling the aggregation behavior of magnetic-responsive particles. Under a static magnetic field, particles form chain-like structures; under a rotating magnetic field, particle aggregation is encouraged, leading to longer chain-like structures; under an alternating magnetic field, complete particle disaggregation is observed periodically.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Review
Energy & Fuels
Javad Mohammadpour, Ann Lee, Victoria Timchenko, Robert Taylor
Summary: Phase change materials have high potential for thermal energy storage, but their uptake has been limited due to slow charging response, limited life, and economic considerations. The development of nano-enhanced phase change materials is now a major focus to overcome these technical challenges. China has played a central role in research and international collaboration in this field.
Article
Green & Sustainable Science & Technology
Zibo Zhou, Svetlana Tkachenko, Prateek Bahl, Dana Tavener, Charitha de Silva, Victoria Timchenko, Jessica Yajie Jiang, Mark Keevers, Martin Green
Summary: This study investigates a potentially cost-effective method for lowering the temperature of photovoltaic (PV) modules. The use of vortex generators (VGs) on the rear surface of the module is shown to effectively reduce the operating temperatures by enhancing the convective flux. Computational fluid dynamics simulations and measurements confirm the importance of VG shapes and placement in the formation of vortices and the improvement of convection.
Article
Chemistry, Multidisciplinary
Imrana I. Kabir, John C. Osborn, Weijian Lu, Jitendra P. Mata, Christine Rehm, Guan H. Yeoh, Tunay Ersez
Summary: The study revealed the aggregation of nanodiamond particles and the ellipsoidal structure of ND particles through SANS measurements. The contrast variation technique was useful in characterizing the non-diamond outer shell of the particles and determining the outer layer thickness. Understanding the structure of NDs at multiple length scales is crucial for various applications and for studying particle-particle interactions and aggregation structures.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Thermodynamics
Hengrui Liu, Ivan Miguel De Cachinho Cordeiro, Anthony Chun Yin Yuen, Qing Nian Chan, Sanghoon Kook, Guan Heng Yeoh
Summary: A new predictive fire suppression model has been developed and applied to analyze the suppression mechanisms of water mist and sprinkler systems. The efficiencies and effectiveness of both systems were investigated, and their performance was evaluated. The study finds that water mist systems outperform sprinkler systems in terms of time and utilization rate, while sprinkler systems have a larger effective suppression coverage area.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Electrochemistry
Ao Li, Anthony Chun Yin Yuen, Wei Wang, Jingwen Weng, Chun Sing Lai, Sanghoon Kook, Guan Heng Yeoh
Summary: This study proposes a three-dimensional thermal model to simulate the thermal propagation effect inside battery packs, aiming to improve the thermal management performance of batteries. The results show that different abnormal heat locations have different impacts on the surrounding coolant and other cells. Based on the current battery pack setups, the maximum temperature of Row 2 cases may increase, along with an increase in temperature difference.
Article
Nuclear Science & Technology
Syed Ahsan Sharif, Mark Kai Ming Ho, Victoria Timchenko, Guan Heng Yeoh
Summary: In this study, a simulation of the condensation of a rising vapor bubble in subcooled boiling flow was performed using the InterSection Marker (ISM) method, an interface tracking method developed by the authors. The ISM method was coupled with an in-house variable-density and variable-viscosity single-fluid flow solver using the immersed boundary method. The condensation process was simulated by modeling source terms in the Computational Fluid Dynamics (CFD) governing equations. The simulation predicted the condensing bubble properties for different initial bubble sizes and liquid subcooling values and showed good agreement with previous studies, demonstrating the ISM method as an efficient, reliable, and viable tool for multiphase flow simulations involving heat and mass transfers across the interface.
NUCLEAR ENGINEERING AND DESIGN
(2023)
Article
Engineering, Manufacturing
Zhao Sha, Xinying Cheng, Yang Zhou, Andrew N. Rider, Andrew D. M. Charles, Wenkai Chang, Shuhua Peng, May Lim, Victoria Timchenko, Chun H. Wang
Summary: RF induction compatible self-healing composites were developed by hybridizing iron oxide nanoparticles and carbon fiber veils in poly(ethylene-co-methacrylic acid) (EMAA), resulting in enhanced magnetic and electrical properties. The multiscale conductive networks created by Fe3O4 nanoparticles and CFVs led to an improved electrical conductivity and heating efficiency. Additionally, the combination of Fe3O4 nanoparticles and CFVs significantly improved the bonding strength of EMAA polymer, making it suitable for various applications such as self-healing and reversible bonding.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Chemistry, Physical
Declan Finn Keogh, Mark Baldry, Victoria Timchenko, John Reizes, Chris Menictas
Summary: Liquid metal batteries (LMBs) are influenced by the interaction of thermal, compositional, and electromagnetic forces, and a three-layer numerical model was developed to investigate this behavior. The results showed that thermal convection was suppressed by electro-vortex flow and swirl flow induced by a background magnetic field. Compositional gradients in the cathode had a significant impact on the flow, highlighting the challenge of mixing in large-scale LMBs.
JOURNAL OF POWER SOURCES
(2023)
Article
Biochemistry & Molecular Biology
Imrana I. Kabir, Juan Carlos Baena, Wei Wang, Cheng Wang, Susan Oliver, Muhammad Tariq Nazir, Arslan Khalid, Yifeng Fu, Anthony Chun Yin Yuen, Guan Heng Yeoh
Summary: The effect of varying the weight percentage composition of low-cost expandable graphite, ammonium polyphosphate, fibreglass, and vermiculite in polyurethane polymer was studied. The synergistic effect between these components on the flame retardant properties of the PU composites was investigated. The PU composites containing 40 wt.% expandable graphite showed superior flame retardant performance.
Article
Ecology
Timothy Bo Yuan Chen, Anthony Chun Yin Yuen, Ivan Miguel De Cachinho Cordeiro, Hengrui Liu, Ruifeng Cao, Amy Ellison, Guan Heng Yeoh
Summary: The demand for underground railways has increased rapidly due to urbanization and population growth, emphasizing the need for tunnel designs with adequate fire safety measures. However, the complexity of modern rail tunnel designs makes it difficult to implement prescriptive codes and often leads to overly conservative designs. This study reviews the current state of tunnel fire analysis, focusing on Australia. A large-eddy simulation-based fire model is used to investigate the temperature and smoke dispersion in a 2 MW metro tunnel fire case scenario. The results suggest the need for revision of current tunnel fire standards and response protocols.
Article
Ecology
Ivan Miguel De Cachinho Cordeiro, Hengrui Liu, Anthony Chun Yin Yuen, Timothy Bo Yuan Chen, Ao Li, Cheng Wang, Ruifeng Cao, Guan Heng Yeoh
Summary: This study establishes a database to investigate the suppression effects of water-based suppression systems under different configurations and fire locations. The results show that the water mist system can effectively control fires above 200 degrees Celsius with a relatively short suppression time.
Article
Ecology
Preety Moni Doley, Anthony Chun Yin Yuen, Imrana Kabir, Luzhe Liu, Cheng Wang, Timothy Bo Yuan Chen, Guan Heng Yeoh
Summary: The smoke toxicity and fire risk of seven commonly used building polymers were analyzed using a systematic fire performance evaluation system. The results showed variations in smoke toxicity and fire risk among different polymers under different fire conditions.
Article
Electrochemistry
Ao Li, Anthony Chun Yin Yuen, Wei Wang, Timothy Bo Yuan Chen, Chun Sing Lai, Wei Yang, Wei Wu, Qing Nian Chan, Sanghoon Kook, Guan Heng Yeoh
Summary: The increasing popularity of lithium-ion battery systems has led to a growing interest in optimizing their performance, thermal stability, and fire safety, especially in electric vehicles and energy storage systems. This paper presents a comprehensive investigation of the temperature distribution and heat exchange process in battery packs using a three-dimensional electro-thermal model coupled with fluid dynamics. The results demonstrate the effectiveness of an artificial neural network model for optimizing battery design and achieving a decrease in maximum temperature and temperature difference. The simulation results provide practical guidance for optimizing battery configuration and cooling efficiency, while ensuring safety performance. The innovative approach of utilizing high-fidelity electro-thermal/CFD numerical inputs for ANN optimization has the potential to enhance thermal management and reduce the risks of thermal runaway and fire outbreaks.
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)