Article
Materials Science, Ceramics
Wenhao Xie, Weisan Hua, Xuelai Zhang, Huijin Xu, Liqiang Gao, Liyu Zhang
Summary: This study compared the effects of different thermal conductivity enhancers on the performance of silica gel/calcium chloride composite adsorbents and found that carbon nanotubes (CNTs) are the most effective enhancers. Experimental results show that the CNT-embedded gel composite has a larger specific surface area and pore volume, high thermal conductivity and thermal diffusion coefficient, as well as higher adsorption capacity and thermal stability. Therefore, this composite adsorbent has promising prospects in adsorption desalination systems for addressing water scarcity.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Benoit Michel, Nicolas Dufour, Clementine Bortlein, Camille Zoude, Elodie Prud'homme, Laurent Gremillard, Marc Clausse
Summary: This study evaluates the performance of a heat exchanger coated with CaCl2 in thermochemical heat transformers for industrial waste heat recovery. Experimental tests were conducted, and a model heat exchanger plate was used to compare two configurations: a thick layer of CaCl2 representing a packed bed reactor (reference) and a CaCl2-PVA deposit representing a coated reactor. The results show that the coated heat exchanger achieves higher performance, with a specific power of up to 341 W/kg for a temperature lift of 63 K. However, repeatability tests revealed changes in temperature profiles, indicating a change in properties of the CaCl2/PVA compound material. Future steps include improving the material formulation and deposit protocol, as well as conducting tests at a smaller reactor scale to assess system performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Hegazy Rezk, Ramy H. Mohammed, Emanne Rashad, Ahmed M. Nassef
Summary: This study aims to optimize the operating conditions of an adsorption cooling cycle using artificial intelligence. By creating an accurate ANFIS model, it is demonstrated that fuzzy modeling can more accurately predict the performance of the cooling cycle compared to ANOVA modeling.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Thermodynamics
Pan Quanwen, Shan He, Zacharie Tamainot-Telto, Wang Ruzhu
Summary: An adsorption refrigeration system driven by low grade heat and using natural refrigerant has the advantage of reducing greenhouse gas emissions. However, it has low efficiency and high cost. The use of Pinch Technology for optimal waste heat recovery can improve the coefficient of performance (COP) of the system.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Construction & Building Technology
Matt Wegner, Helen Turnell, Gareth Davies, Akos Revesz, Graeme Maidment
Summary: This study investigates the use of District Heating in cable tunnels and explores the benefits of heat recovery in reducing electrical distribution losses and operating costs. The results show significant potential for wide-scale replication and environmental benefits.
SUSTAINABLE CITIES AND SOCIETY
(2021)
Article
Engineering, Multidisciplinary
Mahmoud B. Elsheniti, A. T. Abd El-Hamid, O. A. El-Samni, S. M. Elsherbiny, E. Elsayed
Summary: A lab-scale two-bed adsorption chiller driven by solar energy was designed, constructed, and experimentally evaluated, achieving a specific cooling capacity of about 75 W/kg and a coefficient of performance of 0.42 under specific operating conditions. Effects of adsorption/desorption times and chilled water temperatures on the chiller performance were investigated.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Mahmoud Badawy Elsheniti, Ahmed Rezk, Mohamed Shaaban, Mohamed Roshdy, Yahia Mohamed Nagib, Osama A. Elsamni, Bidyut Baran Saha
Summary: This paper numerically investigated how the thermal and adsorption characteristics of adsorbent materials affect the overall performance of solar adsorption cooling cum desalination systems. The study found that while the Aluminum Fumarate metal-organic framework outperformed conventional silica gel in adsorption characteristics, its lower thermal characteristics limited the performance of the integrated system.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Hesham Khalil, Takushi Saito, Hamdy Hassan
Summary: This article presents a comparative experimental study of three different cooling systems used with thermoelectric generators mounted on a chimney for waste heat recovery. The results show that liquid cooling systems are a better option compared to the heat pipes' system, especially when considering the required surface area.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Y. M. Liu, Z. X. Yuan, X. Wen, C. X. Du
Summary: This study evaluated the performance of a solar adsorption cooling system using a silica gel-water working pair, finding optimal performance at an adsorption time of 45 minutes. Comparison with a SAPO-34 zeolite-water system showed that the silica gel system outperformed at the optimal adsorption time.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yiwen Wang, Yafei He, Aijun Gong, Lina Qiu, Min Zhang, Mory Traore, Xiaoning Zhan, You Li, Yuzhen Bai, Yang Liu, Ge Gao, Weiyu Zhao
Summary: We developed an adsorption column using a functional ligand grafted onto amino silica gel for rare earth recovery from acid mine drainage. The optimized operating conditions were determined to be a flow rate of 500 μL min-1 and an eluent of pH=2 with 0.013 mol L-1 DTPA. The recovery of rare earth metals from actual AMD achieved high percentages and the purity of rare earth in AMD increased significantly after recovery. Furthermore, detailed investigations were conducted on the thermodynamics, kinetics, adsorption mechanism, and theoretical calculations of the adsorption process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Mouna Hecini, Meftah Tablaoui, Salaheddine Aoudj, Baya Palahouane, Ouahiba Bouchelaghem, Samia Beddek, Nadjib Drouiche
Summary: The study demonstrates that recycling the waste slurry from wire sawing of silicon ingot into wafers for the preparation of sodium silicates precursor to synthesize silica gel is an economical method to manage waste. The process of recycling SiC involved liquid-liquid extraction and alkali dissolution, ultimately resulting in a powder mixture containing 28% Si and 72% SiC. The alkali dissolution process using sodium hydroxide was optimized to react with silicon in the slurry waste to prepare the Na2SiO3 precursor for the synthesis of silica xerogel.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Thermodynamics
Ramy H. Mohammed, Ali Radwan, Ahmed Rezk, Abdul Ghani Olabi, Vikas Sharma, Abul Kalam Hossain, Abed Alaswad, Mohammad Ali Abdelkareem
Summary: This study computationally investigates an integrated adsorption-absorption system for cooling and desalination, utilizing waste heat. The adsorption cycle successfully utilizes the waste heat from the absorption subsystem, improving energy efficiency. Experimental results show that using a sinusoidal waste heat source enhances water production and cooling effects of the absorption and adsorption subsystems.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Yi-Wen Lv, Xun Zhu, Hong Wang, Mao-Lin Dai, Yu-Dong Ding, Jun-Jun Wu, Qiang Liao
Summary: This study proposed a new method combining water and air cooling to eliminate particle adhesion during heat recovery, and an experimental hybrid cooling system was built to demonstrate excellent anti-adhesion performance.
Article
Thermodynamics
Guokun Liu, Yanzhou Qin, Dongxu Ji
Summary: This study selects organic fluid (R245fa) with low boiling temperature for phase change cooling of PEMFC stack and employs organic Rankine cycle (ORC) for waste heat recovery. The effect of channel layout, sectional size, and channel shape on cooling and heat recovery performance is investigated through simulation of boiling flow. The results demonstrate the good cooling performance of flow boiling, as the cooling plates can be cooled to a reasonable temperature with a maximum surface temperature difference within 15 K. The serpentine straight channel and spiral straight channel achieve the highest ORC thermal efficiency of 7%, while the serpentine zigzag channel has the best temperature uniformity contribution due to its secondary circulation flow. This study showcases the potential of flow boiling for PEMFC thermal management and provides guidance for cooling channel design.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Zhaoyang Cui, Qian Du, Jianmin Gao, Rushan Bie
Summary: A deep cooling tower was designed to efficiently recover waste heat and gaseous water from humid flue gas. The design of tower equipment and absorption heat pump system was optimized. The running resistance of the tower is less than 240 Pa, and the structured packing achieves maximum heat transfer power under different liquid to gas ratios. The absorption heat pump system has a coefficient of performance of 1.71, and can achieve significant energy and water recovery, as well as reduce emissions of CO2, dust, SO2, and NOx.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Review
Chemistry, Multidisciplinary
Andrew Chapman, Elif Ertekin, Masanobu Kubota, Akihide Nagao, Kaila Bertsch, Arnaud Macadre, Toshihiro Tsuchiyama, Takuro Masamura, Setsuo Takaki, Ryosuke Komoda, Mohsen Dadfarnia, Brian Somerday, Alexander Tsekov Staykov, Joichi Sugimura, Yoshinori Sawae, Takehiro Morita, Hiroyoshi Tanaka, Kazuyuki Yagi, Vlad Niste, Prabakaran Saravanan, Shugo Onitsuka, Ki-Seok Yoon, Seiji Ogo, Toshinori Matsushima, Ganbaatar Tumen-Ulzii, Dino Klotz, Dinh Hoa Nguyen, George Harrington, Chihaya Adachi, Hiroshige Matsumoto, Leonard Kwati, Yukina Takahashi, Nuttavut Kosem, Tatsumi Ishihara, Miho Yamauchi, Bidyut Baran Saha, Md Amirul Islam, Jin Miyawaki, Harish Sivasankaran, Masamichi Kohno, Shigenori Fujikawa, Roman Selyanchyn, Takeshi Tsuji, Yukihiro Higashi, Reiner Kirchheim, Petros Sofronis
Summary: This study details the research themes being conducted by the International Institute for Carbon-Neutral Energy Research (I2CNER) and highlights the importance of international collaboration and favorable policy agendas in achieving carbon neutrality. The study emphasizes the need for a diverse range of technologies and initiatives to realize a carbon-free energy system.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2022)
Article
Thermodynamics
Hisham Maher, Tahmid Hasan Rupam, Kaiser Ahmed Rocky, Ramadan Bassiouny, Bidyut Baran Saha
Summary: This study focuses on the synthesis and characterization of composites comprising RD silica gel and metal-organic framework MIL-100(Fe) to improve the performance of adsorption-based atmospheric water harvesting system. The impact of adding MIL-100(Fe) on the properties of the composites was experimentally investigated, and three performance indicators were introduced to evaluate the system's performance.
Article
Thermodynamics
Yu Aristov, L. G. Gordeeva
Summary: Adsorption processes are commonly used to convert low- or ultralow-temperature heat into usable energy, with specific applications such as the VentireG process for ULT heat regeneration. A new approach for deeper analysis of this process involves plotting water adsorption isosters directly on psychrometric charts. This method allows for simultaneous tracking of air and adsorbent states, enabling a conscious selection of appropriate adsorbents for specific climatic zones.
Article
Thermodynamics
I. S. Girnik, W. Lombardo, A. Sapienza, Yu. I. Aristov
Summary: Adsorption heat transformation is an effective and environmentally friendly method that utilizes low-temperature heat. This study investigates the dynamics of water adsorption in relation to the initiation pathway and suggests that the specific power of adsorption heat transformers can be improved by optimizing the working cycle.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Tahmid Hasan Rupam, M. L. Palash, Anutosh Chakraborty, Bidyut Baran Saha
Summary: This study explores the application of metal organic frameworks (MOFs) as adsorbent materials in adsorption-based heat transformation. Different MOFs were synthesized and their water adsorption was measured. The entropy generation and surface properties were studied to understand the relationship between surface energy and water adsorption. This information is crucial for designing efficient adsorption-based heat transformation applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Analytical
Sampad Ghosh, Samira Yasmin, Jannatul Ferdous, Bidyut Baran Saha
Summary: The effect of molybdenum disulfide (MoS2) as a buffer layer on the parameters of CZTS-based solar cell devices was explored. The proposed structure of graphene/MoS2/CZTS/Ni exhibited enhanced solar cell performance.
Article
Energy & Fuels
Alexandr Shkatulov, Haruka Miura, Seon Tae Kim, Massimiliano Zamengo, Takuya Harada, Hiroki Takasu, Yukitaka Kato, Yuri Aristov
Summary: This study investigates the modification of MgO with the triple eutectic mixture LiNO3-NaNO3-KNO3 in order to improve its decarbonation performance. The composites were comprehensively characterized and tested for their sorption properties. The results show that the material has high conversion rate, CO2 uptake, and excellent heat storage capacity at high temperatures.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Green & Sustainable Science & Technology
Israt Jahan, Md. Amirul Islam, Tahmid Hasan Rupam, Mujib L. Palash, Kaiser Ahmed Rocky, Bidyut Baran Saha
Summary: Adsorption-assisted energy conversion technologies are receiving extensive attention as a sustainable solution for meeting global energy demands. In this study, the water sorption properties of MOF-801 were enhanced by introducing nickel and cobalt into the framework. Two novel bimetallic MOFs, Ni-MOF-801 and Co-MOF-801, were successfully synthesized and showed improved porous and adsorption properties compared to pristine MOF-801. Co-MOF-801 demonstrated a 43% increase in specific cooling effect compared to the pristine MOF-801. These findings contribute significantly to the development of high-performance adsorption-based energy conversion systems.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2022)
Article
Thermodynamics
Bo Han, Anutosh Chakraborty
Summary: This study focuses on the comprehensive study of MOFs plus water systems for adsorption desalination applications. The modifications and characterizations of MOFs are investigated, and the water adsorption characteristics are analyzed for different pressure and temperature conditions. Performance factors such as SDWP and PR are evaluated, and entropy generation is calculated based on the water adsorption characteristics.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Svetlana Strelova, Larisa G. Gordeeva, Alexandra D. Grekova, Aleksei N. Salanov, Yuri I. Aristov
Summary: This study aims to accelerate methanol desorption from a composite LiCl/vermiculite and improve the heat storage capacity of adsorption thermal batteries. By modifying the vermiculite with an aluminum-oxygen containing additive, the methanol desorption time is reduced by a factor of 2-12, resulting in a fourfold increase in the specific power of the heat storage stage. This research has important implications for accelerating the sorption of various substances on composites based on macroporous matrices.
Article
Thermodynamics
Shahadat Hosan, Md Matiar Rahman, Shamal Chandra Karmaker, Andrew J. Chapman, Bidyut Baran Saha
Summary: This paper investigates the impact of remittances on multidimensional energy poverty in Bangladesh using a nationally representative Household Income and Expenditure Survey. The findings suggest that households with remittance income have a significantly lower level of energy poverty. The authors argue that increasing remittance inflow can contribute to alleviating energy poverty in Bangladesh and other developing nations, and therefore, national programs should be established to promote migrant workers, reduce household energy costs, and invest in modern energy technologies.
Article
Chemistry, Physical
Yu. I. Aristov
Summary: Adsorptive heat transformation is a promising technology for heat storage, conversion, and cold generation. Its development hinges on the advancement of adsorbents, efficient cycle implementation, and alignment of adsorbent-cycles. This article investigates the utilization of adsorption potential theory to achieve these goals and highlights the progress made in adsorptive heat transformation.
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
(2023)
Article
Engineering, Environmental
Bo Han, Anutosh Chakraborty
Summary: This research focuses on restructuring the MIL-53 (Al) MOFs in order to enhance their hydrophilicity and hydrophobicity, leading to improved water loadings and transfer kinetics. The modified MOFs show promising potential for thermal energy storage applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
S. V. Strelova, Yu. I. Aristov, L. G. Gordeeva
Summary: Adsorption Heat Conversion (AHC) is an energy-saving and environmentally friendly alternative to conventional compression systems. The use of innovative adsorbent bed configurations, such as gluing ready-made grains to the heat exchanger surface, can enhance the power of AHC systems. Inorganic binders are found to increase the effective heat transfer coefficient, while organic binders have no effect on heat transfer. The findings provide insights into the factors controlling adsorption kinetics and offer recommendations for designing innovative bed configurations.
Article
Thermodynamics
Balaji Bakthavatchalam, Khairul Habib, Cecilia D. Wilfred, R. Saidur, Bidyut Baran Saha
Summary: This paper investigates the application of an ionic liquid in nanofluids and compares its stability and thermal properties with conventional surfactants. The results show that the inclusion of the ionic liquid improves the thermal conductivity and stability of the nanofluid. However, the electrostatic repulsive force of the ionic liquid decreases with increasing temperature. The nanofluid containing the ionic liquid demonstrates the most significant enhancement in thermal conductivity at 303 K and a maximum dispersion stability of over one month.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(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)
