Article
Energy & Fuels
Shangui Luo, Yulong Zhao, Liehui Zhang, Zhangxin Chen, Xuyang Zhang
Summary: This study proposes a workflow for coupled geological modeling, fracturing, and reservoir simulations in tight conglomerate reservoirs, which was validated through a case study and serves as a guide for maximizing the production and economic benefits of horizontal wells in tight conglomerate reservoirs.
Article
Chemistry, Physical
Yancong Jiang, Yongming He, Yisheng Liu, Shuangshuang Sun, Zijia Wang
Summary: This study presents a comprehensive productivity model that considers multiple influencing factors, including contamination, threshold pressure gradient, stress sensitivity, and fluid compressibility, in the actual production process of low-permeability reservoirs.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Jiaping Tao, Siwei Meng, Dongxu Li, Gang Cao, Yang Gao, He Liu
Summary: This paper conducted systematic experiments to clarify the interaction between CO2 and shale in different lithofacies and draw relevant conclusions. The results showed that the effects of CO2 treatment on porosity and permeability varied depending on the lithofacies. For foliaceous shale, CO2 treatment had both improving and damaging effects on porosity and permeability, while for laminated shale, both porosity and permeability improved significantly. Therefore, it is necessary to identify the main lithofacies of the target formation before applying CO2 technology in shale oil reservoirs.
APPLIED SCIENCES-BASEL
(2022)
Article
Thermodynamics
Parisa Bagherzadeh, Kamran Goshtasbi, Ezatallah Kazemzadeh
Summary: Fractured reservoirs are important hydrocarbon resources, but production-induced stress increase can lead to fracture sealing and decreased production rates. Experimental results show that the stress sensitivity of porosity in fractured rock is lower than that of permeability and compressibility. The permeability and compressibility of fractured reservoirs are more dependent upon the orientation, opening, density, and persistency of fractures.
JOURNAL OF POROUS MEDIA
(2021)
Article
Thermodynamics
Mingjing Lu, Zenglin Wang, Marte Gutierrez, Kai Chen, Bintao Zheng, Guanglong Sheng, Yuliang Su
Summary: This paper investigates the impact of water saturation on gas storage and transport capacity in shale gas reservoirs by calculating water film thickness in different inorganic pores. Models for apparent porosity and permeability of inorganic matter with water film are proposed, and the effects of water saturation on these parameters are analyzed. Results show that increasing water saturation significantly reduces apparent porosity and permeability, leading to lower gas storage and transport capacity in reservoirs.
JOURNAL OF POROUS MEDIA
(2021)
Article
Geosciences, Multidisciplinary
Wei Guo, Xiaowei Zhang, Rongze Yu, Lixia Kang, Jinliang Gao, Yuyang Liu
Summary: This study comprehensively considers the influence of multiple physical phenomena on the flow of shale gas in nano-scale pores and establishes an apparent permeability model. The research results show that the contributions of different physical phenomena to permeability depend on pore pressure and pore size, and the presence of real gas effect and confinement effect significantly affect permeability. This study is of great significance for accurately measuring the permeability of shale matrix and evaluating the productivity of shale gas horizontal wells.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Mechanics
Dongxu Zhang, Liehui Zhang, Huiying Tang, Shuwu Yuan, Hui Wang, Shengnan (Nancy) Chen, Yulong Zhao
Summary: A discrete fracture model was proposed in this study to simulate rock deformation and two-phase flow behaviors in NFR, with sensitivity analysis conducted on key parameters. Results showed that the fluid-solid coupling effect weakened with production time, decreased with increased matrix permeability, fracture connectivity controlled the water flood front, and water injection intensity affected natural fracture opening deformation and well productivity.
Article
Energy & Fuels
Lanlan Yao, Qihong Lei, Zhengming Yang, Youan He, Haibo Li, Guoxi Zhao, Zigang Zheng, Haitao Hou, Meng Du, Liangbing Cheng
Summary: The physical property changes caused by stress changes in the process of volumetric fracturing of shale oil have an impact on the recovery. This research conducted a physical simulation experiment with constant confining pressure and variable pore pressure using an online nuclear magnetic resonance (NMR) technique. The results showed that increasing pore pressure was more effective for matrix reservoirs, while unloading pressure had less influence on fractured reservoirs. Increasing pore pressure greatly supplemented formation energy and improved the permeability of matrix reservoirs.
Article
Energy & Fuels
Zijian Wei, J. J. Sheng
Summary: Improving permeability is crucial for enhancing oil and gas recovery in ultra-low permeability reservoirs. This study investigates the temperature and stress sensitivity of permeability using heating treatment and real-time measurement on cores from different reservoirs. The results show that the permeability increases with temperature and stress, with different mechanisms observed in different rocks.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Umar Manzoor, Muhsan Ehsan, Muyyassar Hussain, Muhammad Khizer Iftikhar, Kamal Abdelrahman, S. M. Talha Qadri, Farooq Arshad, Komal Ashraf, Mohammed S. S. Fnais
Summary: Petrophysical analysis is a crucial practice for reservoir evaluation, but conventional interpretation faces limitations due to reservoir complexity and uncertainties. Therefore, a delicate machine-learning approach has been applied to analyze potential and interpret well log data effectively. This comprehensive study evaluates different algorithms and demonstrates the efficacy of ML-based petrophysics in providing reliable and optimized quality logs.
Article
Energy & Fuels
Milad Farahani, Hamed Aghaei, Hossein Masoumi
Summary: This study investigates the influence of different pore types on the porosity, permeability, and pore volume compressibility of rocks. Samples with touch vug and tight matrix pores exhibit the most significant changes in porosity and permeability, while samples with touch vug pores also show significant changes in pore volume compressibility. Samples with tight matrix pores have the lowest pore volume compressibility.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Weijun Shen, Tianran Ma, Xizhe Li, Baojiang Sun, Yong Hu, Jianchun Xu
Summary: Efficient and accurate understanding of fluid flow behavior in ultra-deep natural gas reservoirs is challenging. A fully coupled fluid flow and geomechanical model was developed to simulate production phenomena in these reservoirs. The model was verified using data from a gas field in China, and the effects of reservoir properties and geomechanics on gas production were discussed. The results showed a funnel-shaped decline in reservoir pressure and water saturation during depletion, and higher gas phase permeability led to more methane production. Geomechanical effects significantly changed the production behavior, and factors such as porosity, permeability, elastic modulus, and Poisson's ratio influenced gas production.
Article
Geochemistry & Geophysics
Hao Chen, Jianfei Wei, Hanlie Cheng, Qiang Qin, Ying Chen, Linqiang Zhang
Summary: Formation pressure decreases during fracturing fluid flowback and gas production. The stress sensitivity of fractures affects their permeability and gas well productivity. This study investigates the stress sensitivity of proppant-containing fractures with different roughness and its impact on well productivity. Experimental samples with varying proppant concentrations and fracture surfaces are used to quantify stress sensitivity. The results show that proppant concentration and fracture surface roughness significantly influence fracture permeability and stress sensitivity, impacting well productivity.
Article
Engineering, Petroleum
Faruk Civan
Summary: The effective-stress coefficients of porous-rock formations vary due to different rock properties affected by physical mechanisms of rock deformation. Shock effect and hysteresis are observed in fractured-rock formations and heterogeneous porous rocks, respectively, during loading/unloading processes. A modified power-law equation provides a better correlation for the Biot-Willis coefficient compared to the semilogarithmic and basic power-law equations, offering a full range of applicability and more accurate experimental data matching.
Article
Energy & Fuels
Yang Zhao, Ting Liu, Baiquan Lin, Yong Sun
Summary: This study investigated the stress sensitivity of multiscale pores in coal seams using the LF-NMR method. The research found that the volume of pores decreases with increasing confining stress, except in cases caused by water migration. It was also discovered that pore compressibility is not constant, but decreases with increasing confining stress and is scale-dependent.
Article
Energy & Fuels
Jingang Fu, Yuliang Su, Lei Li, Wendong Wang, Chengwei Wang, Dongsheng Li
Summary: A novel productivity model of multi-stage fractured horizontal wells with mechanisms of multiple seepage was proposed in this study. The results show that stress effect negatively affects effective permeability, while the Knudsen diffusion effect of gas has a positive influence. Additionally, water flow can inhibit gas flow in tight gas reservoirs, especially when there are larger displacement pressure differences.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Jingang Fu, Yuliang Su, Zhangxing Chen, Lei Li, Wendong Wang, Shiyuan Zhan
Summary: This study proposed a novel model to reveal the distribution of water film confined inside circular or elliptic pores in shale, considering disjoining pressure, interfacial tension, and real gas effect. The phenomena of capillary condensation and partial condensation were observed, and the model was verified by comparing with previous data.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Yuliang Su, Xue Zhang, Lei Li, Yongmao Hao, Shiyuan Zhan, Wendong Wang, Zangyuan Wu, Wenjing Zhang
Summary: This study investigated the occurrence states and distribution of residual oil in deep-buried clastic reservoirs after water flooding, and found potential mechanisms for improving oil recovery. Microscopic visualization experiments using innovative equipment were conducted, revealing the presence of various types of residual oil formations. The study highlights the migration characteristics and initiation mechanisms of residual oil under N-2 injection after water flooding, which could potentially enhance the development of deep-buried clastic reservoirs.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Tao Zhang, Liehui Zhang, Yulong Zhao, Ruihan Zhang, Dongxu Zhang, Xiao He, Feng Ge, Jianfa Wu, Farzam Javadpour
Summary: This study investigates the gas-water transient imbibition and drainage processes in two-dimensional nanoporous media using a lattice Boltzmann model. Sensitivity analyses were performed on fluid and rock characteristics, revealing the fingering nature of the nonwetting phase. The study provides insights into the microscopic ganglia dynamics of gas-water two-phase flow in nanoporous media.
Article
Mathematics, Interdisciplinary Applications
Guanqun LI, Yuliang Su, Wendong Wang
Summary: Large-scale hydraulic fracturing is crucial for efficient shale oil production, but the mechanisms of fracturing fluid flow in shale micropores and the impact of shale microstructure and physical properties are not well understood. This lack of understanding hinders the optimization of fracturing flowback and limits shale oil recovery enhancement. This study analyzes the characteristics of shale pores using SEM and XRD experiments, finding multiple pore types including organic pores, brittle mineral pores, and clay pores. The study investigates the influence of cross-section shapes on capillary force and analyzes the dynamics of imbibition in different pore types. A shale semi-analytical solution that considers imbibition time, fluid properties, pore cross-section shapes, tortuosity, and forced pressure is established using a shale multi-pores physical model and fractal theory.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2023)
Article
Geochemistry & Geophysics
Yi Lou, Yuliang Su, Wendong Wang, Peng Xia, Ke Wang, Wei Xiong, Yin Yu, Linjie Shao, Fuqin Yang, Xiangping Chen
Summary: The coal facies of the Late Permian Longtan Formation were studied, and five different coal facies were identified. The moist forest peat swamp facies showed the highest porosity and larger pore size compared to other facies. Coal facies play a significant role in controlling the pore structure of coal reservoir.
Article
Energy & Fuels
Yuxuan Deng, Wendong Wang, Yuliang Su, Shibo Sun, Xinyu Zhuang
Summary: In this study, a double sweet spot analysis system and an optimization method for sweet spot parameters were proposed. Unsupervised machine learning algorithms were used to determine the classification standard of general reservoirs and high-quality sweet spot reservoirs. The results show that this method can accurately locate the sweet spot in gas fields.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Energy & Fuels
Zongfa Li, Yuliang Su, Fuxiao Shen, Lijuan Huang, Shaoran Ren, Yongmao Hao, Wendong Wang, Yang Meng, Yang Fan
Summary: The feasibility of N2 alternating CO2 injection for improving CO2 storage and oil production was investigated through laboratory experiments and numerical simulation. The results showed that the N2 alternating CO2 flooding had 2.1% lower CO2 storage factor and 7.1% lower enhanced oil recovery compared to continuous CO2 injection. However, the larger the N2 slug volume, the lower the EOR and CO2 storage factor, due to the reduction of CO2 concentration in the gas phase and CO2 solubility in oil and water. Nevertheless, the N2 slugs significantly reduced mobility differences between flowing zones, resulting in a 1.78 times larger gas swept area and a 44% higher cumulative oil production compared to continuous CO2 injection. Moreover, the optimized N2 alternating CO2 injection scheme achieved 19.6% more CO2 storage than continuous CO2 flooding at a field scale. This study provides valuable experimental and theoretical support for improving CO2 storage and oil production in an oil reservoir.
Article
Energy & Fuels
Wendong Wang, Chengwei Wang, Yuliang Su, Yang Zhao, Jiayi Wen, Lei Li, Yongmao Hao
Summary: CO2 storage is an important technique for achieving carbon peak and carbon neutralization, and depleted gas reservoirs are potential candidates for geological CO2 storage. High water-bearing wells in volcanic depleted gas reservoirs can be selected for CO2 storage. The gas-water distribution characteristics of the gas reservoir after CO2 injection are evaluated and the CO2 injection timing and volume are optimized. Typical wells have been selected for CO2 storage based on the research results.
Article
Energy & Fuels
Wendong Wang, Xincheng Guo, Penghui Duan, Bo Kang, Da Zheng, Atif Zafar
Summary: This study simulated the plugging process by microspheres and nanospheres and evaluated their plugging performance on the core matrix. The best combination of injection parameters was optimized and the results showed that nanospheres had a higher plugging rate compared to microspheres. The maximum oil recovery after plugging was achieved with an injection ratio of 2:1 between nanospheres and microspheres, a total injection of 0.6 pore volume, an injection rate of 1.5 mL/min, and an aging time of 6 days.
NATURAL GAS INDUSTRY B
(2023)
Article
Energy & Fuels
Wendong Wang, Jiayi Wen, Chengwei Wang, Sina Rezaei Gomari, Xinyue Xu, Shuang Zheng, Yuliang Su, Lei Li, Yongmao Hao, Dongxia Li
Summary: CO2 storage with enhanced gas recovery (CSEGR) technology is a pivotal solution for mitigating the greenhouse effect and complying with energy conservation and emission reduction policies. This paper thoroughly analyzes the mechanisms and potential of CO2 storage in gas reservoirs, as well as the factors affecting CSEGR. It also examines the current challenges and future trends in CSEGR development.
Article
Chemistry, Multidisciplinary
Han Wang, Jianchao Cai, Yuliang Su, Zhehui Jin, Mingshan Zhang, Wendong Wang, Guanqun Li
Summary: In this study, an improved multicomponent and multiphase lattice Boltzmann method is proposed to investigate the effects of water phase on CO2 huff-n-puff in shale nanoporous media. The competitive adsorption behaviors between oil and CO2 and the miscibility of oil-CO2 are considered. Additionally, the effects of oil-CO2 miscibility on oil-water flow behaviors and relative permeability are discussed. The results show that water phase has a significant impact on oil recovery and CO2 storage, and the oil-CO2 miscibility affects the oil-water relative permeability in calcite nanoporous media.
Editorial Material
Engineering, Chemical
Wei Yu, Zhiming Chen, Bin Wang, Wendong Wang, Kamy Sepehrnoori
TRANSPORT IN POROUS MEDIA
(2023)
Article
Energy & Fuels
Qiuheng Xie, Wendong Wang, Yuliang Su, Han Wang, Zhouyuan Zhang, Wubin Yan
Summary: In this study, a pore-scale numerical simulation based on the lattice Boltzmann method is used to investigate the calcite dissolution process. The impact of pressure difference and temperature on the dissolution dynamics and dissolution patterns are analyzed. The results show that pressure difference has a decreasing effect on calcite dissolution with increasing temperature, and high temperature and high injection rate are favorable for mineral trapping.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Zhong-Zheng Wang, Kai Zhang, Guo-Dong Chen, Jin-Ding Zhang, Wen-Dong Wang, Hao-Chen Wang, Li -Ming Zhang, Xia Yan, Jun Yao
Summary: Production optimization is crucial in the smart oilfield community for maximizing economic benefits and oil recovery. This study proposes an efficient and robust method, evolutionary-assisted reinforcement learning (EARL), to achieve real-time production optimization under uncertainty. The approach models the optimization problem as a Markov decision process and uses a deep convolutional neural network to adaptively adjust well controls based on reservoir states. Simulation results demonstrate that EARL outperforms prior methods in terms of optimization efficiency, robustness, and real-time decision-making capability.
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)
