Article
Chemistry, Physical
Mubbashar Nazeer, Farooq Hussain, M. Ozair Ahmad, Sadia Saeed, M. Ijaz Khan, Seifedine Kadry, Yu-Ming Chu
Summary: This study explores the multi-phase flow of non-Newtonian fluid with heat transfer through a horizontal channel, using Jeffrey fluid as the base liquid with suspended metallic particles of Hafnium. Heating effects, magnetic field, and radiative heat flux are considered in the model, which shows that thermal energy increases friction force and viscous dissipation while enhancing heat transfer due to radiation. The momentum of multi-phase flow increases due to shear thinning effects caused by the Jeffrey fluid parameter.
SURFACES AND INTERFACES
(2021)
Article
Thermodynamics
Geng Zhang, Hongwei Yang, Jun Li, Gonghui Liu, Honglin Huang, Yufei Chen, Tong Wu, Wei Wang
Summary: In this paper, a novel method of dual-channel drillpipe for drilling ultra-deep formation was proposed, and a transient heat transfer model considering different heat transfer mechanisms and technological characteristics of dual-channel drillpipe drilling was established. The validity of the model was indirectly verified by real case temperature measurements. Numerical simulation results showed that the dual-channel drillpipe drilling could effectively reduce bottom hole pressure, achieve stability in shorter time, and slow down the temperature changes of drilling fluid. Furthermore, the heat transfer from formation to wellbore was reduced compared to conventional drilling methods. Therefore, dual-channel drillpipe drilling has potential for drilling in ultra-deep formation at ultra-high temperature.
APPLIED THERMAL ENGINEERING
(2023)
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
Thermodynamics
Paul Dillon
Summary: High temperature heat treatment is often used in the manufacturing process of commercial products, which requires a specific temperature-time profile. A novel CFD simulation model is developed for heat transfer in the cooling section of a continuous furnace. This model includes multiple solid domains and uses a dual-solver approach to solve for convective and radiant heat transfer in the gas phase and heat conduction in the solid phases separately. The model provides a snapshot of the thermal performance of the system in a reasonable time frame, which has practical implications for large-scale industrial equipment modeling. Radiative cooling effects are accounted for using a discrete-ordinates model.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Review
Thermodynamics
Arman Haghighi, Akbar Maleki, Mamdouh El Haj Assad, Lingen Chen, Mohammad Alhuyi Nazari, Mostafa Safdari Shadloo
Summary: Heat pipes are widely used for thermal management in high heat flux devices. Special working fluids such as hydrogen, neon, and nitrogen are necessary for efficient heat transfer at very low temperatures. The performance of cryogenic heat pipes depends on factors like filling ratio, input power, and working fluid, with their effective thermal conductivity surpassing that of conductive metals significantly. Further research is recommended to enhance the performance of cryogenic heat pipes.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Yuxi Li, Longcang Shu, Rui Xiao, Yuezan Tao, Shuyao Niu, Zhe Wang
Summary: Groundwater heat pump (GWHP) systems provide geothermal energy utilization, with the aboveground part being relatively mature in design and construction. However, the underground part lacks sufficient development. The experimental results show that the structure of the pumping-recharge well has an impact on the heat transfer characteristics of GWHP systems, with the length and distance between screens affecting the pumping water temperature and thermal breakthrough time. The study suggests that the differences between the length of pumping and recharge well screens and the distance between them must be considered in the design of GWHP systems to improve heat transfer efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Runfeng Xiao, Yicheng Zhang, Liang Chen, Junxin Wang, Shuangtao Chen, Yu Hou
Summary: This paper conducts simulations of supercritical heat transfer of R134a in horizontal tubes to study the effects of circumferential heat conduction on heat transfer deterioration and explain the abnormal phenomena of higher temperature distribution in non-gravity supercritical flow. The results indicate that heat transfer deterioration is caused by impaired specific heat and heat conduction in the boundary layer, and the subsequent heat transfer recovery is due to enhanced thermal conduction and turbulent convection. A dimensionless parameter called the Biot number is defined to characterize the thermal resistance ratio of circumferential conduction to convective heat transfer. The redistribution of wall temperature caused by circumferential conduction affects supercritical convection in horizontal tubes, and non-gravity supercritical flow may have higher wall temperature when the Biot number is small. The deterioration of the top surface can be significantly alleviated by using a tube with larger wall thickness or thermal conductivity.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Nemat Mashoofi Maleki, Mohammad Ameri, Ramin Haghighi Khoshkhoo
Summary: In this study, a new method is experimentally investigated to enhance the heat transfer efficiency by introducing a vibrating string inside a heated tube. The results show that this method can effectively improve the thermal performance of heat exchangers.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Article
Thermodynamics
Vidula Athawale, Anirban Bhattacharya, Prasenjit Rath
Summary: This paper presents a numerical study of encapsulated phase change material (PCM) energy storage systems with single or multiple capsules, analyzing the impact of various parameters and proposing a novel graded system design to enhance the performance of multi-capsule systems.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Meng Li, Leren Tao, Lihao Huang, Cheng Jin
Summary: The condensing flow and heat-transfer characteristics around dentate-fin tubes were investigated using numerical and experimental methods. The results showed that the circumferential and axial film thicknesses of the dentate-fin tubes increased with increasing fin density. The liquid film distribution of dentate-fin tubes was closely related to the local condensing heat-transfer coefficient.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Waqar Ahmed, Nor Azwadi Che Sidik, Shahid Mehmood, Mir Waqas Alam, H. Fayaz, Muhammad Iqbal Hussain, Omer A. Alawi, Syed Muzamil Ahmed, Syed Nadeem Abbas Shah, S. N. Kazi
Summary: The current research focuses on the chemical synthesis of zinc oxide (ZnO) and preparation of ZnO dispersed in EG@DW mixture-based nanofluids for enhancing heat transfer in a square shaped heat exchanger. The study shows that the addition of ZnO at certain mass concentrations can significantly improve thermal conductivity and has good stability and dispersion.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Seungyeong Choi, Maroosol Yun, Kiwoong Kim, Yong-Ki Park, Hyung Hee Cho
Summary: This study investigates an energy-efficient design of a circulating fluidized bed reactor using numerical simulation and experimental verification. An innovative design with junctions improves the heat transfer performance and has a large thermal margin, making it suitable for continuous CO2 capture.
Article
Engineering, Mechanical
Weili Liu, Hongjian Ni, Yun Wang, Yong Guo, Yu Gao, Peiyu He
Summary: In this study, a three-dimensional finite element dynamics model of the drill-string is established, taking into consideration the dynamic friction model and buckling effect. The modified dynamics model is verified to have higher computational accuracy through laboratory experiments. A parameter study is conducted based on the dynamics model, revealing significant effects of the exciting force amplitude, drilling fluid density, axial force, friction coefficient, and drill-string dimension on the friction reduction performance and effective propagation distance of axial vibration. A prediction model for vibration propagation distance is established, enabling efficient optimization of axial vibration parameters in horizontal well drilling. This study can provide theoretical guidance for safely and efficiently reducing sliding friction in the exploitation of unconventional oil and gas reservoirs.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Najiyah Safwa Khashi'ie, Iskandar Waini, Norihan Md Arifin, Ioan Pop
Summary: The proficiency of Cu-Al2O3/water hybrid nanofluid as a heat transfer coolant was numerically analyzed using the bvp4c interface in Matlab software. The results indicated that the nanofluid can significantly enhance heat transfer performance, although an increase in squeezing parameter leads to a decrease in heat transfer coefficient and an increase in suction strength contributes to better heat transfer.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Jingxuan Xie, Jiansheng Wang, Xueling Liu
Summary: In this study, a three-dimensional enhanced geothermal system (EGS) with pinnate horizontal well structure is proposed to improve the heat extraction performance. Numerical investigations show that the production temperature and total heat production of EGS with pinnate horizontal well increase significantly compared to conventional EGS with a doublet system. Design parameters such as main well bore number and length are positively correlated with heat extraction performance.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Yunfei Guo, Huiqing Liu, Yabin Feng, Xiaohu Dong, Wei Zheng
Summary: Steam-assisted gravity drainage (SAGD) is a widely used thermal method for developing heavy oil reservoirs. This study expands the analytical model for steam chamber geometry to include the rise and confinement stages of SAGD, establishing models to estimate oil production rate and SOR with time. The newly proposed model is validated against experimental data and numerical simulation, showing greater accuracy than previous models and providing significant guidance for the development of SAGD processes in oil fields.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Qichen Zhang, Xiaodong Kang, Huiqing Liu, Xiaohu Dong, Jian Wang
Summary: This study investigates the impact of breccia interlayer on SAGD performance through physical experiments and numerical simulations. The results show that the presence of breccia interlayer leads to a thinner steam chamber, longer production time, and reduced ultimate oil recovery. Moreover, lower permeability in thicker breccia layer areas has a significant adverse effect on oil recovery, while permeability has a limited impact on performance in thinner breccia layer areas.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Xiaohu Dong, Qilan Luo, Jing Wang, Huiqing Liu, Zhangxin Chen, Jinze Xu
Summary: This article proposes a new method to quantitatively evaluate the effect of pore heterogeneity on the adsorption behavior of fluids in nanopores. The proposed method is validated against experimental data of shale rocks.
Review
Engineering, Chemical
Dong Feng, Zhangxin Chen, Keliu Wu, Jing Li, Xiaohu Dong, Yan Peng, Xinfeng Jia, Xiangfang Li, Dinghan Wang
Summary: This paper presents the current advances and systematic summary on the fluid flow in shale gas reservoirs. It discusses the shale pore structures, reservoir fluids, and various flow phenomena and mechanisms driven by scale effects. The influences of scale effects and pore structures on fluid flow through heterogeneous shale matrix are clarified. The study concludes that fluid flow in shale gas reservoirs is a complex multi-scale process accompanied by multi-physical phenomena and multi-fluid distributions.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Tingen Fan, Wenjiang Xu, Wei Zheng, Weidong Jiang, Xiuchao Jiang, Taichao Wang, Xiaohu Dong
Summary: In this paper, a new model for the productivity of a CSS well in multilayer heavy oil reservoirs is proposed, which can accurately predict the preliminary productivity of CSS well by analyzing the formation factor and equivalent flow resistance, etc. The accuracy of the model is verified by comparing with actual results.
Article
Energy & Fuels
Ning Lu, Xiaohu Dong, Zhangxin Chen, Huiqing Liu, Wei Zheng, Bo Zhang
Summary: In this paper, Molecular Dynamics (MD) simulation is used to investigate the adsorption behavior of asphaltenes in the hybrid thermal-solvent recovery process. The study concludes that nC(4)H(10) is the optimal solvent for heavy oil reservoirs.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Bin Zhao, Xiaohu Dong, Yanpeng Chen, Shanshan Chen, Zhangxin Chen, Yan Peng, Yishan Liu, Xiuchao Jiang
Summary: This study investigated the evolution of pore structure during the heating process of coal. The results showed that the heating process can be divided into three stages, dominated by drying, primary pyrolysis, and secondary pyrolysis reactions at different temperature ranges. The coal transformed into porous char or ash framework during the heating process.
Article
Energy & Fuels
Xiaohu Dong, Jian Wang, Huiqing Liu, Deshang Zeng, Qichen Zhang
Summary: This paper investigates the recovery performance of the multi-lateral well SAGD process in heavy oil reservoirs using a three-dimensional physical model. The advantages of multi-lateral wells in terms of liquid production and steam chamber expansion are discussed based on experimental observations. The distribution of residual oil saturation after the SAGD process is also analyzed. The results show that the application of multi-lateral wells can effectively increase the oil recovery factor and improve the recovery time compared to the conventional dual horizontal well SAGD process.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Editorial Material
Geosciences, Multidisciplinary
Xiaohu Dong, Jing Wang, Zhehui Jin, Feng Yang, Yulong Zhao
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Chemistry, Physical
Xiaohu Dong, Wenjing Xu, Renjing Liu, Zhangxin Chen, Ning Lu, Wenting Guo
Summary: This study investigates the adsorption and diffusion behavior of shale oil in nanoscale slit nanopores using molecular dynamics simulation. The results show that multicomponent alkanes can form multilayer adsorption states in the nanopores, with heavy components occupying the porewall surface adsorption sites. The adsorption and diffusion behavior is influenced by factors such as fluid composition, nanopore type, and porewall wettability. The study provides important data support for the effective development of shale oil reservoirs.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Materials Science, Multidisciplinary
Xuecheng Jiang, Chunlei Wei, Yan Gu, Xiaohu Dong, Zhijian Xie, Qi Zhang, Chun Zhu, Weiying Qian, Naiyan Lu, Guoqing Chen, Guofeng Yang
Summary: We report and compare a sensitive heavy metal ion sensor for the detection of copper ion, iron ion, lead ion, and cadmium ion. The sensor is based on AlGaN/GaN high electron mobility transistor (HEMT) with L-cysteine functionalized active region. It exhibits fast and stable response to various heavy metal ions and shows a current response that decreases with increasing concentration of the ions. The AlGaN/GaN HEMT-based sensor demonstrates high sensitivities for Cu2+, Fe3+, Pb2+, and Cd2+ detection, suggesting its potential in efficient and fast detection of heavy metal ions.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Energy & Fuels
Liangliang Jiang, Shanshan Chen, Yanpeng Chen, Zhangxin Chen, Fenjin Sun, Xiaohu Dong, Keliu Wu
Summary: Underground coal gasification (UCG) has the prospect of tapping deep coal seams and reducing carbon emissions. However, there is limited experience in deep UCG development. This study constructed a large-scale 3D UCG model with an improved method and considered the effect of double-diffusive natural convection. The results showed that the improved method was beneficial for the development of UCG cavities in deep coal seams, and double-diffusive natural convection played an important role in cavity development and overall UCG performance.
Article
Energy & Fuels
Yishan Liu, Lin Zu, An Sheng, Yanan Hou, Yuqi Liu, Changbing Tian, Xiaohu Dong, Zhengdong Lei
Summary: This study focuses on the tight oil reservoir conditions in Xinjiang and conducts experiments and simulations to optimize the development scheme based on the geological model and fluid occurrence state. The research shows that CO2 flooding is more effective in enhanced oil recovery compared to CH4 flooding and water flooding. The injection rate affects the recovery factor, but high injection rates can decrease oil recovery and oil change rate. The presence of complex fractures near the well can increase the swept volume, while fractures far from the well can cause channeling and hinder production. Considering the fluid occurrence state during CO2 displacement is important as it affects the recovery factor and permeability.
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Energy & Fuels
Xiaohu Dong, Wenjing Xu, Huiqing Liu, Zhangxin Chen, Ning Lu, Wuchao Wang
Summary: The replacement mechanisms of CO2 in nanopores of shale oil reservoirs are discussed using static tests and molecular dynamics (MD) simulations in this study. Various molecular models of shale oil and shale rock are developed, and MD simulations are conducted to study the replacement behavior of CO2. The concept of replacement efficiency (RE) is proposed to analyze the effects of shale oil composition, porewall mineral type, and CO2 concentration. This study provides new insights into the understanding of CO2 replacement mechanisms in shale oil reservoirs, which is important for their effective and efficient development.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Xiao-Hu Dong, Xiu-Chao Jiang, Wei Zheng, Hui-Qing Liu, Ren-Jie Liu, Wu-Chao Wang, De-Shang Zeng, Tai-Chao Wang
Summary: This paper systematically evaluates the sweep efficiency of hybrid steam-chemical processes using microscale visualized experiments and macroscale 3D experiments. The effects of different additives on heavy oil properties and sweep efficiency are investigated. The results show that a multiple hybrid EOR process (steam-N-2/foam/surfactant process) has the highest sweep efficiency.
