Article
Thermodynamics
Qi Zhao, Jianhong Zhou, Mingxiang Lu, Chang Liu, Dan Zhang, Qiang Li, Xuemei Chen
Summary: Nature provides inspiration for the design of industrial structures. Water transport in leaf vein systems and open microchannels have been found to improve structural design and heat transfer performance. This study manufactured leaf-vein inspired open microchannels and observed improved heat transfer coefficients compared to traditional microchannels.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Review
Thermodynamics
Daxiang Deng, Long Zeng, Wei Sun
Summary: This paper comprehensively reviews recent advancements in flow boiling enhancement and fabrication of enhanced microchannels. It emphasizes the flow boiling enhancement performance of these enhanced microchannels in microchannel heat sinks, while also discussing their advantages and disadvantages after summarizing the classification and manufacturing methods of enhanced microchannels.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
Yanxing Wang, Hui Wan, Tie Wei, John Abraham
Summary: The heat and mass transfer characteristics of a simple shear flow over a surface covered with staggered herringbone structures were numerically investigated using the lattice Boltzmann method. Two flow motions, spiral flow oscillation and flow recirculation, were identified. These flow motions couple together to form a complex transport mechanism. The results show that the total transfer rate follows a power law relationship with the Schmidt number and Reynolds number.
Article
Chemistry, Multidisciplinary
Kevin Apmann, Ryan Fulmer, Branden Scherer, Sawyer Good, Jake Wohld, Saeid Vafaei
Summary: This study investigates the effects of a connector between two microchannels for the first time. Fe3O4 nanoparticles were introduced to enhance the heat transfer coefficient inside the microchannels, and it was observed that the connector has a significant impact on enhancing the heat transfer coefficient inside the second microchannel.
Article
Mechanics
Yifei Guan, Tianhang Yang, Jian Wu
Summary: The study investigates electrokinetic flow in a microchannel driven by charged surface heterogeneity in the presence of an external electric field through three-dimensional simulations. It is found that the magnitude of the external electric field affects the mixing and transport enhancement of passive scalars by induced electrokinetic vortices.
Article
Thermodynamics
Karthikeyan Paramanandam, S. Venkatachalapathy, Balamurugan Srinivasan
Summary: This paper studies the flow and heat transfer characteristics of microchannel heatsinks with ribs, cavities and secondary channels using numerical simulations. The impacts of rib width on heat transfer enhancement and the combined effects of secondary channels, ribs, and cavities on lowering the temperature and enhancing heat transfer rate are analyzed. The research provides insights on the design and performance evaluation of microchannel heatsinks for practical applications.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Review
Chemistry, Analytical
Zhangyu Zhu, Juan Li, Hao Peng, Dongren Liu
Summary: Heat exchangers are essential equipment for energy exchange in industries, and improving heat transfer with low pump energy consumption can maximize energy utilization. This study reviewed how biomimetic structures can significantly enhance heat transfer and reduce flow resistance in different equipment with various applications. The characteristics of biomimetic structures, such as fractal-tree-like and superhydrophobic micro-nano structures, were analyzed, along with their heat transfer enhancement and drag reduction mechanisms. Additionally, processing methods like photolithography, nanoimprinting, femtosecond laser processing, and 3D printing were introduced for biomimetic structure machining. Future research on biomimetic heat transfer structure optimization was also proposed based on the comprehensive review.
Article
Green & Sustainable Science & Technology
Pingnan Huang, Minqiang Pan
Summary: This study re-evaluates the entransy dissipation of heat transfer from the viewpoint of irreversibility and introduces the concept of local entransy to analyze the heat transfer enhancement mechanism of VC Ms. A secondary design is used to further improve heat transfer performance, showing lower entransy dissipation and higher convective heat transfer efficiency.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Physical
K. Venkata Krishna, Vivek Pandey, M. P. Maiya
Summary: Metal hydride reactors driven by heat are essential for successful development of metal hydride devices such as H2 storage systems. Nature-inspired leaf-vein type fins have shown good heat transfer capabilities. Optimized designs with inclined fins lead to faster storage capacity attainment, reducing absorption time significantly compared to traditional designs. Operating parameters such as hydrogen supply pressure, inlet temperature, and velocity of the heat transfer fluid greatly influence the performance of the optimized design.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Hongfei Zhang, Lingfeng Shi, Xuan Wang, Rui Sun, Ping Yuan, Hua Tian, Gequn Shu
Summary: This study experimentally investigated the heat transfer characteristics of supercritical carbon dioxide (S-CO2) in microchannels and analyzed the effects of different parameters. The results showed that a peak value of the heat transfer coefficient appeared near the pseudo-critical point and decreased with increasing operating pressure. Comparing channels with different diameters, buoyancy had a smaller effect on heat transfer in the smaller diameter channel. A new heat transfer correlation was developed considering the microchannel size effect and thermophysical property variations.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Murun Li, Xuan Gao, Haiwang Li, Jichang Sang, Pengpeng Nie, Weidong Fang, Tiantong Xu
Summary: The flow and heat transfer characteristics of microchannels with various types of fins were analyzed numerically, revealing the exceptional performance of the optimized fin structure at high Reynolds numbers. The aspect ratio, incident angle, and smoothness of the fins influenced the flow and heat transfer behaviors. Fins with a high aspect ratio, small incidence angle, and high smoothness showed the best performance at large Reynolds numbers. Interestingly, microchannels without internal microstructures performed well at small Reynolds numbers. The incident angle had the greatest influence on the flow and heat transfer, generating significant vortices by periodically changing the channel cross-sectional area and flow direction. These conclusions can be generalized to other microchannels with fins.
Article
Thermodynamics
D. C. Moreira, V. S. Nascimento, G. Ribatski, S. G. Kandlikar
Summary: By employing an asymmetric Dual-V groove microchannels geometry and a tapered open manifold, significant enhancements in critical heat flux (CHF), heat transfer coefficient (HTC), and reduction in pressure drop (delta p) were achieved in flow boiling. The design utilizes evaporation momentum force and inertia force to optimize the bubble motion, leading to improved performance in flow boiling.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Rodrigo Castellanos, Andrea Ianiro, Stefano Discetti
Summary: The convective heat transfer in a turbulent boundary layer (TBL) on a flat plate is enhanced using an artificial intelligence approach based on linear genetic algorithms control (LGAC). The actuator is a set of six slot jets in crossflow aligned with the freestream. The optimal controller yields a slightly asymmetric flow field and the LGAC algorithm converges to the same frequency and duty cycle for all the actuators. The results pinpoint the potential of machine learning control in unravelling unexplored controllers within the actuation space.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Ali H. Al-Zaidi, Mohamed M. Mahmoud, Tassos G. Karayiannis
Summary: This paper presents an experimental study on flow boiling patterns, heat transfer rates, and pressure drop in multi-microchannels evaporators made of copper and aluminium. The results showed that aluminium heat sinks have comparable thermal performance to that of copper heat sinks.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Vivian Y. S. Lee, Tassos G. Karayiannis
Summary: The effect of system pressure on the flow boiling characteristics of HFE-7200 in a parallel microchannel heat sink was studied. Increasing pressure reduced pressure drop and increased bubble generation frequency and two-phase heat transfer coefficients. Smaller bubble diameters at higher pressures caused a delay in flow regime transition and flow reversal. The experimental work provides promising methods to manage flow instabilities and enhance heat transfer performance in two-phase microchannel systems.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Nanoscience & Nanotechnology
Hyunchul Park, Iwan Haechler, Gabriel Schnoering, Marco D. Ponte, Thomas M. Schutzius, Dimos Poulikakos
Summary: This study proposes a sustainable atmospheric water harvesting strategy using durable hydrogel sorbents, which operate based on a "ratcheting" mechanism activated by direct sunlight. The strategy improves the daily water productivity and demonstrates great potential to advance the water harvesting capabilities of related systems.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Marianne Aellen, Aurelio A. Rossinelli, Robert C. Keitel, Raphael Brechbuhler, Felipe Antolinez, Sergio G. Rodrigo, Jian Cui, David J. Norris
Summary: The researchers studied the effect of gain on the lasing behavior in plasmonic lasers by placing a semiconductor gain layer near a metallic interface. They found that the thickness of the gain layer determines the nature of the lasing mode, and a gap layer with a high refractive index can be advantageous for plasmonic lasing.
Article
Chemistry, Multidisciplinary
Kartik Regulagadda, Julia Gerber, Thomas M. Schutzius, Dimos Poulikakos
Summary: This study investigates dynamic ice-elastomer interfacial events and reveals that the ice adhesion strength can vary by orders of magnitude due to the shear velocity. The underlying mechanism is elucidated by studying the detailed deformation fields of the elastomer.
MATERIALS HORIZONS
(2022)
Article
Physics, Applied
M. S. Gerlt, A. Paeckel, A. Pavlic, P. Rohner, D. Poulikakos, J. Dual
Summary: This study presents a method for two-dimensional metal microparticle focusing in a round glass capillary using bulk acoustic waves. By analyzing the change of acoustic streaming patterns, the mechanism for manipulating particles in the low-micrometer range is revealed. The results of this study are of great significance for various applications.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Physical
Ario Cocina, Raphael Brechbuhler, Sander J. W. Vonk, Jian Cui, Aurelio A. Rossinelli, Henar Rojo, Freddy T. Rabouw, David J. Norris
Summary: In this study, a nanophotonic approach was used to enhance the characterization of decay processes in semiconductor nanocrystals, addressing open questions related to their emission. By varying the distance between nanocrystals and a gold reflector, the radiative rates were affected through changes in the local density of optical states. The method was applied to CdSe-based nanocrystals to investigate their radiative efficiency, polarization properties, and emission dynamics. The trapping mechanism responsible for delayed emission in CdSe-based nanoplatelets was also identified.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Abinash Tripathy, Kartik Regulagadda, Cheuk Wing Edmond Lam, Matteo A. Donati, Athanasios Milionis, Chander Shekhar Sharma, Efstratios Mitridis, Thomas M. Schutzius, Dimos Poulikakos
Summary: The perfluorodecanethiol (PFDT) coating has demonstrated superior performance in terms of heat transfer and durability compared to other organic coatings such as perfluorodecyltriethoxysilane (PFDTS) and perfluorodecyl acrylate (PFDA). Despite being a monolayer, the PFDT coating exhibited dropwise condensation for at least 63 hours without deterioration, showcasing its hydrolytic stability. Additionally, the cost of thiol functionalization per area was the lowest among the surface hydrophobic treatments used in the study.
Article
Chemistry, Analytical
Raphael Brechbuehler, Milos Selakovic, Philipp Scheidegger, Herbert Looser, Andre Kupferschmid, Stephane Blaser, Jeremy Butet, Lukas Emmenegger, Bela Tuzson
Summary: By using a Vernier-type quantum-cascade laser (QCL) as an electrically tunable multiwavelength source, combined with an efficient driving technique, high-resolution spectra from multiple frequencies can be acquired rapidly, enabling selective and sensitive analysis of volatile organic compounds (VOCs) in complex gas matrices.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Luca Stendardo, Athanasios Milionis, George Kokkoris, Christos Stamatopoulos, Chander Shekhar Sharma, Raushan Kumar, Matteo Donati, Dimos Poulikakos
Summary: A new surface texture design strategy has been discovered through three-dimensional multiphase computational approach, which can achieve efficient droplet departure and enhance condensation heat-transfer efficiency and water harvesting capabilities.
Article
Nanoscience & Nanotechnology
Iwan Haechler, Nicole Ferru, Gabriel Schnoering, Efstratios Mitridis, Thomas M. Schutzius, Dimos Poulikakos
Summary: Counteracting surface fogging is crucial for eyewear, windows, and displays. An innovative transparent, sunlight-activated, photothermal coating is designed to inhibit fogging. This nanoscopically thin percolating gold layer coating achieves impressive performance in fog prevention and removal, even in cloudy conditions, with improved durability and integration capabilities.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Nafsika Chala, Xinyu Zhang, Tomaso Zambelli, Ziyi Zhang, Teseo Schneider, Daniele Panozzo, Dimos Poulikakos, Aldo Ferrari
Summary: Mechanical signals establish communication between mammalian cells and their environment. Cells exert forces and transmit them at focal adhesion points. External stimuli affect the adhesion-free cell surface. The integration of Fluidic Force Microscopy and confocal Traction Force Microscopy enables precise force probing of individual cells, allowing the investigation of cellular mechanisms in response to mechanical stimuli.
Article
Physics, Multidisciplinary
Henry Lambley, Gustav Graeber, Raphael Vogt, Leon C. C. Gaugler, Enea Baumann, Thomas M. M. Schutzius, Dimos Poulikakos
Summary: Supercooled droplet freezing on surfaces is a common phenomenon in nature and industry, but little is known about its effect on droplet-substrate interactions and the design of icephobic surfaces. This study investigates freezing of supercooled droplets on textured surfaces and identifies surface properties that promote ice expulsion. The study also explores mechanisms through which repellency falters and provides insights into the phenomenology of ice adhesion throughout freezing. The findings contribute to the design of icephobic surfaces for increased safety and sustainability in engineering applications.
Article
Multidisciplinary Sciences
Francesca Michela Pramotton, Lucien Cousin, Tamal Roy, Costanza Giampietro, Marco Cecchini, Cecilia Masciullo, Aldo Ferrari, Dimos Poulikakos
Summary: Mammalian cells respond to topographic cues from a substrate, with anisotropic features giving guidance. However, in the extracellular matrix, the presence of noise affects this guidance effect. This study introduces morphotaxis, a mechanism where fibroblasts and epithelial cells move according to gradients of topographic order distortion.
Article
Chemistry, Multidisciplinary
Panagiotis Sarkiris, Vassilios Constantoudis, Kosmas Ellinas, Cheuk Wing Edmond Lam, Athanasios Milionis, John Anagnostopoulos, Dimos Poulikakos, Evangelos Gogolides
Summary: Micro-nanoengineered superhydrophobic surfaces can enhance heat transfer by inducing the formation of highly mobile condensate droplets. The critical role of the correlation length of topography in designing these surfaces for heat transfer applications is demonstrated. A high correlation length value leads to increased space between surface structures, resulting in improved heat transfer coefficient and delayed flooding of the surface. Therefore, correlation length is a critical criterion for optimizing surfaces for condensation heat transfer.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Michal Muszynski, Gianmarco Gabrieli, Lukas Zimmerli, Yuksel Temiz, Ralph Heller, Aaron Cox, Keiji Matsumoto, Kitahiro Kaneda, Patrick W. Ruch
Summary: The design of cost-effective and rapid screening sensing systems is important for providing alternative tools for chemical analysis. Electronic tongues, which combine cross-sensitive sensor arrays with machine learning, can distinguish complex liquids and have been proven in various chemical sensing applications.
Proceedings Paper
Engineering, Electrical & Electronic
Gianmarco Gabrieli, Michal Muszynski, Patrick W. Ruch
Summary: A proof-of-concept system consisting of a miniaturized sensor array, feature extraction, and machine learning pipeline was evaluated for quantifying the concentrations of Ca2+, Mg2+, and Na+ in drinking water. Feature importance methods were used to identify the relationships between the transient potentiometric responses of sensing materials and the cation concentrations. This framework enables the design of cross-sensitive sensor arrays to expedite water testing, complementing traditional chemical analysis for water quality monitoring.
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)
