Article
Multidisciplinary Sciences
Feyyaz Arslan, Bulent Guzel
Summary: The study investigated the printed circuit heat exchanger in supercritical carbon dioxide cycles, achieving highly accurate heat exchanger designs through numerical and experimental analyses. The experimental and numerical results were in good agreement, confirming the effectiveness of the sub-heat exchanger model.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Thermodynamics
Zengxiao Han, Jiangfeng Guo, Xiulan Huai
Summary: To improve the performance of printed circuit heat exchangers (PCHE) in supercritical CO2 (SCO2) Brayton cycle systems, researchers propose adding rib structures to the top flat wall of semicircular channels. The effects of rib structure distribution on channel performance are investigated, with results showing an increase in turbulence kinetic energy and heat transfer enhancement. The best performing channel has a spacing distribution of short rib structures, with a 19.3-19.8% improvement over the conventional channel. This work has great significance for understanding PCHE heat transfer mechanisms, optimizing performance, and improving the overall efficiency and compactness of large-scale SCO2-based power systems.
Article
Thermodynamics
ZengXiao Han, Jiangfeng Guo, Haiyan Zhang, Junlin Chen, Xiulan Huai, Xinying Cui
Summary: The study found that the heat effectiveness of the novel airfoil fins heat exchanger can reach more than 96%, higher than conventional heat exchangers. The novel airfoil channel showed the best comprehensive thermal-hydraulic performance among the three channels in terms of thermodynamics and heat transfer. The proposed correlations for Nusselt number and friction factor of the novel airfoil fins heat exchanger had maximum deviations within +/- 5.0% and +/- 7.1% for flue gas, providing guidance for its application in waste heat recovery.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Manufacturing
Rasoul Bayaniahangar, Ikechukwu Okoh, Kashif Nawaz, Joseph Cesarano, Sajjad Bigham
Summary: This study investigates the permeability and gas leakage rate of ceramic 3D printed materials to eliminate through-plane leakage. The results show that an alumina 3D-printed plate with a thickness of 0.75 mm has a permeability of 6 x 10(-4) millidarcy.
ADDITIVE MANUFACTURING
(2022)
Article
Thermodynamics
Dandan Yin, Yunlong Zhou, Xintian Guo, Di Wang
Summary: This paper numerically studies and compares the thermal-hydraulic characteristics of CO2 and CO2/propane mixtures in wavy printed circuit plate heat exchangers (PCHE). The addition of propane improves the flow and heat transfer performance of the wavy PCHE. New thermal-hydraulic correlations are proposed for these mixture-mixture wavy PCHEs, with prediction deviations of ±4% for the Nusselt number and ±2% for the Fanning coefficient.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Zhang Huzhong, Cheng Keyong, Huai Xiulan, Zhou Jingzhi, Guo Jiangfeng
Summary: An experimental system was built to investigate the global and local performance of an 80-kW PCHE. The study found that thermo-physical properties have a greater effect on heat transfer performance compared to flow characteristics, and new empirical correlations were proposed.
JOURNAL OF THERMAL SCIENCE
(2021)
Article
Thermodynamics
Jiangfeng Guo, Jian Song, Zengxiao Han, Konstantin S. Pervunin, Christos N. Markides
Summary: The thermohydraulic characteristics of supercritical CO2 flows in a vertical tube at cooling conditions are numerically investigated. The influence of the heat-flux condition and flow direction are evaluated. The study shows that the heat-flux condition has little effect on the peak value of the heat transfer coefficient, and the heat transfer characteristics are affected by the buoyancy effect in upward and downward flows.
Article
Thermodynamics
Feng Jin, Deqi Chen, Lian Hu, Yanping Huang, Hao Zeng, Junfeng Wang
Summary: The study investigated the heat transfer and flow resistance of different types of Printed Circuit Heat Exchangers (PCHE) under precooling conditions using numerical methods. The results showed that the zigzag channel PCHE had better heat transfer performance compared to the wavy and airfoil fin channels, while the airfoil fin channel had a lower friction factor.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Yunlong Zhou, Dandan Yin, Xintian Guo, Cunlin Dong
Summary: The study indicates that CO2/propane mixtures as heat transfer fluids exhibit lower pressure loss and higher heat transfer coefficients. The increase in propane molar fraction decreases the fanning friction factor and increases the Nusselt number.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Review
Thermodynamics
Yiyu Men, Xiaohua Liu, Tao Zhang
Summary: The technology of waste heat recovery from medium-low temperature flue gas has been extensively reviewed, focusing on the principle and characteristics of various systems. More advanced waste heat recovery systems are proposed to enhance the difference between the cold source and the flue gas, with heat recovery efficiency exceeding 80% in some cases. Specific systems, such as heat pump systems and vapor pump boiler systems, are analyzed for their efficiency, economic benefits, and pollutant emissions.
Article
Thermodynamics
Feng Jin, Deqi Chen, Lian Hu, Yanping Huang, Shanshan Bu
Summary: This paper investigates the flow distribution and thermohydraulic characteristics of printed circuit heat exchanger (PCHE) with different channel configurations. It is found that PCHE with larger flow resistance in the core region shows better flow uniformity and heat transfer performance. A modified manifold with bent fins and airfoil fins is proposed to improve the flow maldistribution of PCHE, reducing the flow non-uniformity by 39.4% to 61.8% and increasing the overall performance by 5% to 8.5% compared to the original manifold.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jian Wang, Xin-ping Yan, Bendiks J. Boersma, Ming-jian Lu, Xiaohua Liu
Summary: Printed circuit heat exchangers (PCHE) are proposed to improve heat recovery and energy saving in supercritical CO2 (S-CO2) power cycles. A modified channel PCHE is investigated to enhance the thermal-hydraulic performance. The results show that the inserted straight section reduces pressure loss and improves flow uniformity, leading to a significant improvement in performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Feng Jin, Dewen Yuan, Deqi Chen, Lian Hu, Yanping Huang, Shanshan Bu
Summary: An experimental investigation was conducted to explore the heat transfer performance of supercritical CO2 in the mini channels of a zigzag printed circuit heat exchanger (PCHE). The results showed that the heat transfer coefficient was higher near the pseudocritical region and was significantly influenced by the mass flux and pressure, while the effect of inlet temperature was relatively small. Furthermore, four new cooling heat transfer correlations were proposed and compared, considering the effect of velocity change and cross-sectional thermophysical property variation on heat transfer performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Morteza Khoshvaght-Aliabadi, Parvaneh Ghodrati, Yong Tae Kang
Summary: Supercritical carbon dioxide (SCO2) technologies are considered ingenious solutions to energy and environmental problems by developed countries. The SCO2 power cycle is a promising technology due to its high efficiency and low cost. However, the optimal designs of heat exchange devices in the SCO2 power cycle are crucial as they account for a significant portion of capital costs.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Energy & Fuels
Xiaoming Dong, Cancan Zhang, Yuting Wu, Yuanwei Lu, Chongfang Mu
Summary: This study analyzes the effect of structural and operating parameters on the performance of a molten salt-supercritical CO2 concentric tube heat exchanger using the distributed parameter method. Optimal design and optimization calculations are conducted to improve the heat exchange efficiency.
Article
Energy & Fuels
Jiangfeng Guo
Article
Thermodynamics
Jiangfeng Guo, Xiulan Huai
APPLIED THERMAL ENGINEERING
(2016)
Article
Thermodynamics
Jiangfeng Guo, Xiulan Huai
APPLIED THERMAL ENGINEERING
(2016)
Article
Thermodynamics
Min Xu, Jun Cai, Jiangfeng Guo, Xiulan Huai, Zhigang Liu, Hang Zhang
Article
Thermodynamics
Jiangfeng Guo, Xiulan Huai
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Chemistry, Physical
Mengru Xiang, Jiangfeng Guo, Xiulan Huai, Xinying Cui
JOURNAL OF SUPERCRITICAL FLUIDS
(2017)
Article
Thermodynamics
Jiangfeng Guo, Xiulan Huai, Keyong Cheng, Xinying Cui, Haiyan Zhang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Green & Sustainable Science & Technology
Jiangfeng Guo, Xiulan Huai, Keyong Cheng
Article
Thermodynamics
Jiangfeng Guo, Mengru Xiang, Haiyan Zhang, Xiulan Huai, Keyong Cheng, Xinying Cui
Article
Thermodynamics
Jiangfeng Guo, Xinying Cui, Xiulan Huai, Keyong Cheng, Haiyan Zhang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Xinying Cui, Jiangfeng Guo, Xiulan Huai, Haiyan Zhang, Keyong Cheng, Jingzhi Zhou
Article
Thermodynamics
Haiyan Zhang, Jiangfeng Guo, Xiulan Huai, Xinying Cui, Keyong Cheng
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Chemistry, Physical
Haiyan Zhang, Jiangfeng Guo, Xiulan Huai, Keyong Cheng, Xinying Cui
JOURNAL OF SUPERCRITICAL FLUIDS
(2019)
Proceedings Paper
Energy & Fuels
Jiangfeng Guo, Xinying Cui, Haiyan Zhang, Xiulan Huai, Keyong Cheng
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
(2019)
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)
