Article
Chemistry, Multidisciplinary
Yafen Han, Shuai Li, Haidong Liu, Yucong Li
Summary: In order to study the heat conduction of nanoporous aerogel, a gas-solid heat conduction model was established based on the microstructure of aerogel. The model was divided into two subdomains and simulated using the lattice Boltzmann method. It was found that the temperature distribution of the solid phase became more uniform with increasing scale, and the temperature jump on the gas-solid interface decreased with increasing gas-phase scale. Additionally, the thermal conductivity of gas-solid coupling varied with the scale of the gas phase or solid phase, showing a scale effect.
Article
Engineering, Chemical
Shuo-Lin Wang, Zhe Jin, Jun-Ning Li, Ben-Xi Zhang, Yi-Bo Wang, Yan -Ru Yang, Xiao-Dong Wang, Duu-Jong Lee
Summary: In this study, an analytical thermal conductivity model for alumina aerogel-fiber-opacifier composites was developed based on real material micro-structures, and validated by comparing its predictions with measured thermal conductivity data. The study revealed the existence of two solid-gas coupling heat transfer mechanisms in aerogels, providing important insights for understanding the thermal insulation performance of aerogel composites.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Polymer Science
Fengfei Lou, Sujun Dong, Yinwei Ma, Bin Qi, Keyong Zhu
Summary: This study investigated the thermal transport mechanism in aerogels of metal thermal protection system (MTPS) using CFD numerical simulation, particularly focusing on the impact of emissivity on thermal insulation performance. The results indicated that reducing emissivity can significantly enhance thermal insulation performance, especially for materials with small extinction coefficients at high temperatures.
Article
Thermodynamics
He Liu, Jia'ao Liu, You Tian, Xuehong Wu, Zengyao Li
Summary: Pure silica aerogel has high transmittance at high temperature, so ceramic fibers with a diameter comparable to the wavelength of incident thermal radiation are introduced to reduce the radiative thermal conductivity. Aligning the fibers perpendicular to the incident radiation is the most effective way to minimize the radiative thermal conductivity, and the optimal fiber diameter decreases with increasing temperature. There exists an optimal mass fraction of doped fibers to achieve the minimized thermal conductivity due to the trade-off relationship between the conductive and radiative thermal conductivities.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
He Liu, Jia'ao Liu, You Tian, Xuehong Wu, Zengyao Li
Summary: Silica aerogel is a promising material for thermal insulation applications due to its low thermal conductivity and density. To improve its performance, ceramic fibers are introduced into the pure silica aerogel. This study developed a theoretical model to investigate the thermal conductivity of fiber-reinforced aerogel composites at high temperature, considering the inclination angle, diameter, and mass fraction of the doped fibers.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Jun-Xiong Zhang, Jing Zhang, Xin-Li Ye, Xiao-Ming Ma, Rong Liu, Qi-Long Sun, Yun-Lei Zhou
Summary: A novel SiCNW aerogel composed of silicon carbide nanowires (SiCNWs) with ultralow density, high-temperature resistance, and great thermal insulation properties shows promising potential for applications in harsh conditions.
Article
Thermodynamics
Akos Lakatos, Attila Csik, Istvan Csarnovics
Summary: This paper presents research results on the performance of aerogel materials in terms of thermal conductivity, specific heat, and combustion heat, providing important references for designers and researchers. The study found that temperature and external load significantly affect thermal conductivity, while thickness variations have minor impacts. Additionally, the combustion heat of aerogel was measured and investigated before and after combustion using advanced microscopy techniques.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Polymer Science
Kyoung-Jin Lee, Jae Min Lee, Ki Sun Nam, Haejin Hwang
Summary: In this research, a spherical silica aerogel powder with hydrophobic surfaces was successfully synthesized through ambient pressure drying, utilizing solvent exchange and surface modification as key steps in the preparation process.
Article
Chemistry, Physical
Yiduan Zhang, Lele Gong, Xiaojing Xu, Li Zhao, Kai Li, Guojie Liang, Li Li, Qiang Xie
Summary: This study proposes a one-pot preparation strategy to simplify the complex processes of synthesizing carbon aerogel, significantly shorten the preparation time, and obtain carbon aerogels with ultra-low density and excellent thermal protection properties. The physicochemical properties of the carbon aerogel samples obtained through regulating the solvent species are discussed in detail.
Article
Chemistry, Physical
Xiaoxiao Guo, Shujian Cheng, Bo Yan, Yile Li, Ruoyu Huang, Junxiao Li, Weiwei Cai, Yufeng Zhang, Yinghui Zhou, Xue-ao Zhang
Summary: Graphene aerogel shows low elastic modulus and high thermal conductivity. Annealing at high temperature improves its crystallinity and thermal conductivity. Under pressure, its thermal conductivity is greatly enhanced and is 30 times higher than other graphene-based thermal interface materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Polymer Science
Zixuan Zheng, Guojie Liang, Li Li, Jing Liu, Xinbo Wang, Yi Sun, Kai Li
Summary: This study proposes an efficient approach for fabricating carbon foam-reinforced carbon aerogel composites. By compounding nanoporous polyimide aerogel with pre-carbonized phenolic resin-based carbon foam, co-shrinkage is achieved during co-carbonization, effectively utilizing the thermal insulation capacity of carbon aerogel and formability of pre-carbonized foam.
Article
Construction & Building Technology
Huijun Wu, Haiying Zhang, Guangpeng Zhang, Jia Liu, Zhenyu Liu, Fanghui Du
Summary: This study proposed an equal volume replacement method using ultra-light SiO2 aerogel instead of conventional aerogel to reduce the amount of aerogel additive in foamed concrete while maintaining high thermal insulation performance and low density. The results showed that using ultra-light aerogel powder effectively reduced the density and thermal conductivity of the foamed concrete, while significantly reducing the mass dosage of aerogel. Applying ultra-light aerogel foamed concrete in the construction of exterior walls can reduce heat loss.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Y. X. Chen, S. Sepahvand, F. Gauvin, K. Schollbach, H. J. H. Brouwers, Qingliang Yu
Summary: This study investigates a silica-cellulose composite aerogel made from olivine silica, which exhibits lower thermal conductivity and higher strength compared to traditional cellulose aerogel, showing promising potential as a high-performance insulation material.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Ceramics
Wei Wang, Le Pang, Ming Jiang, Yaping Zhu, Fan Wang, Jingwen Sun, Huimin Qi
Summary: The tunable porous structure of SiCN(O)-derived ceramic aerogels was investigated by changing the molecular structure of the polysilazanes from linear to branched in this study. The effect of molecular structure on the thermal insulation properties of ceramic aerogels was also studied. As the percentage of branched molecular structure in the polysilazane precursor increased, the internal microscopic pore structure of the aerogels changed from macroporous to mesoporous. The specific surface areas and pore volumes of the ceramic aerogels prepared with different precursors increased after pyrolysis at 1000 degrees C, and the thermal conductivities increased slightly.
CERAMICS INTERNATIONAL
(2023)
Article
Thermodynamics
Duanle Li, Dongmin Wang, Yong Cui
Summary: The addition of aerogel can enhance the thermal resistance of aerogel-enhanced porous geopolymers (APG), but excessive addition can lower their mechanical strength. A content of approximately 6% aerogel can meet both the thermal conductivity and mechanical performance standards of APG.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Physics, Applied
Xinpeng Zhao, Xin Qian, Xiaobo Li, Ronggui Yang
Summary: Interfaces play a crucial role in developing functional materials with low thermal conductivities and are becoming a bottleneck for thermal management in electronic devices. The study shows that the width of nanofins first increases and then decreases with increasing height of 100 nm, affecting interface thermal conductance due to competition between the enlarged interface area and increased backscattering of transmitted phonons.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Xinpeng Zhao, Keke Song, Haiyou Huang, Yu Yan, Yanjing Su, Ping Qian
Summary: Through first-principles calculations and machine-learning methods, this study investigates the influence of alloying elements on the ductility of Mg2Si alloys. It is found that appropriate alloying elements can enhance the ductility of Mg2Si alloys, which is closely related to atomic volume and electronegativity.
Article
Materials Science, Multidisciplinary
W. Yu, X. Zhao, P. Jiang, C. Liu, R. Yang
Summary: The alignment of super-aligned CNT films plays a crucial role in tuning their thermal transport properties, with different alignment configurations affecting thermal conductivity and anisotropic ratio. This study provides an efficient method for designing thermally anisotropic films for thermal management by manipulating alignment.
MATERIALS TODAY PHYSICS
(2021)
Article
Thermodynamics
He Liu, Xinpeng Zhao
Summary: Developing a robust, cost-effective, super-thermal insulation material with ultralow thermal conductivity is challenging. Various building blocks have been explored to fabricate super-thermal insulators with different pore structures, and understanding heat transfer in highly porous structures is essential for design and applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Green & Sustainable Science & Technology
Zhihan Li, Chaoji Chen, Hua Xie, Yuan Yao, Xin Zhang, Alexandra Brozena, Jianguo Li, Yu Ding, Xinpeng Zhao, Min Hong, Haiyu Qiao, Lee M. Smith, Xuejun Pan, Robert Briber, Sheldon Q. Shi, Liangbing Hu
Summary: The study presents a top-down approach for producing high-performance natural macrofibres from bamboo stems that outperform wood-derived fibres and are comparable to synthetic carbon fibres. The use of these natural fibres could lead to substantial reduction in carbon emissions, offering a pathway towards sustainability in various industries such as automotive, aeronautics, and construction.
NATURE SUSTAINABILITY
(2022)
Article
Chemistry, Multidisciplinary
Chaoji Chen, Yubing Zhou, Weiqi Xie, Taotao Meng, Xinpeng Zhao, Zhenqian Pang, Qiongyu Chen, Dapeng Liu, Ruiliu Wang, Vina Yang, Huilong Zhang, Hua Xie, Ulrich H. H. Leiste, William L. L. Fourney, Shuaiming He, Zhiyong Cai, Zhenqiang Ma, Teng Li, Liangbing Hu
Summary: This study reports a fire-proofing, thermally insulating, and recyclable 3D G-CNF foam fabricated from graphite and cellulose. A scalable ionic crosslinking method is developed to fabricate Cu-G-CNF foam, which shows excellent water stability, fire resistance, and low thermal conductivity. The foam has the potential to replace commercial plastic-based foams and provide a sustainable solution against plastic pollution.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Correction
Multidisciplinary Sciences
Xizheng Wang, Yunhao Zhao, Gang Chen, Xinpeng Zhao, Chuan Liu, Soumya Sridar, Luis Fernando Ladinos Pizano, Shuke Li, Alexandra H. Brozena, Miao Guo, Hanlei Zhang, Yuankang Wang, Wei Xiong, Liangbing Hu
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Xizheng Wang, Yunhao Zhao, Gang Chen, Xinpeng Zhao, Chuan Liu, Soumya Sridar, Luis Fernando Ladinos Pizano, Shuke Li, Alexandra H. Brozena, Miao Guo, Hanlei Zhang, Yuankang Wang, Wei Xiong, Liangbing Hu
Summary: This study presents an ultrahigh-temperature melt printing method that enables rapid melting and uniform mixing of multi-principal element alloys (MPEA) for 3D printing. The method shows great potential in the fabrication of MPEA structural materials.
NATURE COMMUNICATIONS
(2022)
Article
Green & Sustainable Science & Technology
Xinpeng Zhao, Yu Liu, Liuxian Zhao, Amirhossein Yazdkhasti, Yimin Mao, Amanda Pia Siciliano, Jiaqi Dai, Shuangshuang Jing, Hua Xie, Zhihan Li, Shuaiming He, Bryson Callie Clifford, Jianguo Li, Grace S. S. Chen, Emily Q. Q. Wang, Andre Desjarlais, Daniel Saloni, Miao Yu, Jan Kosny, J. Y. Zhu, Amy Gong, Liangbing Hu
Summary: Researchers have developed a sustainable material called "insulwood" that has high porosity, high sound absorption, low thermal conductivity, and high mechanical strength. It is made by removing lignin and hemicelluloses from natural wood using a rapid high-temperature process followed by low-cost ambient drying. Insulwood shows promise as a construction material for improved noise and thermal regulation due to its unique combination of attributes such as renewable source materials, high porosity, high sound absorption, low thermal conductivity, and high mechanical robustness.
NATURE SUSTAINABILITY
(2023)
Article
Multidisciplinary Sciences
Qi Dong, Aditya Dilip Lele, Xinpeng Zhao, Shuke Li, Sichao Cheng, Yueqing Wang, Mingjin Cui, Miao Guo, Alexandra H. Brozena, Ying Lin, Tangyuan Li, Lin Xu, Aileen Qi, Ioannis G. Kevrekidis, Jianguo Mei, Xuejun Pan, Dongxia Liu, Yiguang Ju, Liangbing Hu
Summary: This study presents a catalyst-free thermochemical depolymerization method that uses a spatial temperature gradient and a temporal heating profile to efficiently convert waste plastic into monomers. By applying this approach, polypropylene (PP) and poly(ethylene terephthalate) (PET) were successfully depolymerized with high yields.
Article
Construction & Building Technology
Amanda P. Siciliano, Xinpeng Zhao, Rebecca Fedderwitz, Kishore Ramakrishnan, Jiaqi Dai, Amy Gong, J. Y. Zhu, Jan Kosny, Liangbing Hu
Summary: In this paper, a strategy for wood chip reuse is proposed by converting them into bio-based building insulation foam. By introducing additional small pores within the wood chips through a high-temperature chemical treatment process, their thermal conductivity is effectively lowered, and they are used in combination with a binding agent to produce a porous insulation foam. The porous insulation foam exhibits low thermal conductivity and high compressive strength, demonstrating the potential of repurposing wood waste into an effective building material that addresses waste management and sustainable construction challenges.
Article
Chemistry, Multidisciplinary
Xinpeng Zhao, Ablimit Aili, Dongliang Zhao, Dikai Xu, Xiaobo Yin, Ronggui Yang
Summary: Dynamic control of sunlight entering a building through switchable glazing panels can effectively reduce building energy consumption. The dual-mode glazing panel demonstrated in this study achieved significant cooling and heating performance, leading to potential energy savings in office buildings.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Zhiwei Lin, Xinpeng Zhao, Chengwei Wang, Qi Dong, Ji Qian, Guangran Zhang, Alexandra H. Brozena, Xizheng Wang, Shuaiming He, Weiwei Ping, Gang Chen, Yong Pei, Chaolun Zheng, Bryson Callie Clifford, Min Hong, Yiquan Wu, Bao Yang, Jian Luo, Paul Albertus, Liangbing Hu
Summary: This study reports an ultrafast high-temperature sintering (UHS) technique for the rapid fabrication of high-quality silica glass. Using UHS, silica precursors can be densified within seconds, resulting in sintered glasses with high relative densities and high visible transmittances. The UHS technique can also be extended to sinter other functional glasses and transparent ceramics.
Article
Nanoscience & Nanotechnology
Y. M. Xie, X. P. Zhao, S. A. Mofid, J. Y. Tan, B. P. Jelle, R. G. Yang
Summary: The study investigated the effects of different shell materials and shell thicknesses on the optical performance of VO2 core-shell nanoparticle-based thermochromic films. Results indicated an optimal shell thickness for achieving maximum solar modulation ability when the refractive index of the shell material falls between 1.6 and 2.3.
MATERIALS TODAY NANO
(2021)
Article
Energy & Fuels
Tengyao Jiang, Xinpeng Zhao, Xiaobo Yin, Ronggui Yang, Gang Tan
Summary: A thermo-responsive hydrogel-based smart window component with an integrated IR-reflective coating was designed in this study, showing superior performance in hot weather and high solar radiation environments. Energy simulations on a prototype commercial building indicated up to 8.1% annual space cooling energy savings, equivalent to 30.6 kWh/yr.m(2) cooling energy savings per square meter of window glass, for Tucson, AZ, USA.
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)
