Article
Engineering, Multidisciplinary
Liming Teng, Jinbo Jiang, Xudong Peng, Jiyun Li
Summary: This paper investigates a structural form called double-sided spiral groove gas face seal. The steady-state performances, such as film load-carrying capacity and film stiffness, of gas face seals with different groove arrangements are compared. The complete dynamic behavior history is obtained by considering various factors such as axial and angular excitations, gas lubrication, seal rings vibration, and fluid film thickness changes. The effects of groove depths and equilibrium film thickness on the dynamic performance are studied, and the mechanisms of unstable conditions are analyzed. The results show that the double-sided grooving method provides improved gas film load-carrying capacity and stiffness, ensuring stable operation under various conditions.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Mechanics
Yuansen Song, Shaoxian Bai, Jing Yang, Junjie Chen
Summary: This paper presents a compressible cavitation model to study the effect of fluid cavitation intensity on zero-leakage flow. The results show that cavitation has a negative impact on sealing performances, but the groove's configuration and working conditions can control the cavitation intensity. It is also important to consider the formation of a circumferential continuous pressure ring for judging strict zero leakage.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2023)
Article
Engineering, Mechanical
Noel Brunetiere, Mathieu Rouillon
Summary: This study discusses the use of spiral grooves in mechanical face seals to enhance fluid film generation and reduce friction. However, the thickness of the film may cause a transition in the fluid flow regime, which needs to be evaluated.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Fengming Hu, Qiang He, Weifeng Huang, Yuan Yin, Xue Wen, Ying Liu, Yuming Wang
Summary: This paper proposes a new method for condition monitoring of dry gas seals by manufacturing special monitoring grooves on one side of the dual end face. The characteristics of end-face contact can be detected by an acoustic emission sensor, with the primary characteristic being seven times the motor speed frequency.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Tao He, Qiangqiang Zhang, Ying Yan, Jintong Dong, Ping Zhou
Summary: This study presents a novel wave-tilt-dam seal design that integrates spiral groove structures to enhance the hydrodynamic performance of circumferential waviness seals. The objective of the research is to evaluate the mechanical effectiveness of this new design through simulation modeling, with a focus on the impact of structural parameters such as rotational speed and seal pressure on the hydrodynamic behavior under various operating conditions. The results of the study indicate that the new structure effectively improves the hydrodynamic performance of the liquid seal, resulting in a significant increase in film rigidity. Additionally, the study identifies optimal values for structural parameters under specific conditions. By addressing the limitations of traditional spiral groove seals and improving their hydrodynamic performance, this research contributes to the advancement of seal technology.
Article
Chemistry, Physical
Delei Zhu, Jing Yang, Shaoxian Bai
Summary: The study found that under conditions of low temperature and high pressure, helium gas T-groove face seals exhibit sharp divergent deformation, leading to decreased sealing performance and increased leakage rate; as the sealing temperature decreases and rotational speed increases, the sealing performance shows a complex non-monotonic trend.
Article
Engineering, Mechanical
Xuezhong Ma, Xiangkai Meng, Yuming Wang, Yangyang Liang, Xudong Peng
Summary: This study presents an extended Reynolds equation to evaluate the impact of fluid inertia and cavitation on the performance of spiral-grooved mechanical face seals under high-speed conditions. It is found that the fluid inertia effect due to film thickness discontinuities improves load-carrying capacity and increases leakage rate. The convective inertia forces in the sealing gap flow promote fluid cavitation, and the fluid inertia effect on sealing performance is closely related to spiral angles.
TRIBOLOGY TRANSACTIONS
(2021)
Article
Nuclear Science & Technology
Nihal Kaushal, Sudheer Patri, R. Suresh Kumar, C. Meikandamurthy, B. K. Sreedhar, S. Murugan, S. Raghupathy
Summary: Dynamic seals play a critical role in the Absorber Rod Drive Mechanism of Fast Breeder Reactors, with research focusing on sealing mechanism and thermal behavior. Results show that changing the geometry of the seal can lead to significant performance enhancement, but caution is advised when altering seal material and operating temperature. The numerical model developed in this study will aid in the development of more robust dynamic seals in the future.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2021)
Article
Engineering, Mechanical
M. Gani, I. F. Santos, M. Arghir, H. Grann
Summary: A novel approach of thermal coupling between fluid and solids, as well as the implementation of saturation curves to couple temperature, enthalpy, and vapor mass fraction, is presented in the study of a mechanical seal in two-phase flow. The model successfully solves for temperature fields, heat fluxes, enthalpy, and vapor mass fraction using a coupled method. Validation of the model is achieved through good agreement with literature results in various seal behavior and two-phase flow cases.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Hao Shang, Yuan Chen, Xiaolu Li, Yuntang Li, Bingqing Wang, Xudong Peng
Summary: This paper investigates the transient performance of dry gas seals under axial displacement disturbances. The study finds that the upstream pumping spiral groove can restore stable operation in the shortest time, but with increased leakage rate. On the other hand, spiral groove and double-row spiral groove dry gas seals are more sensitive to displacement disturbances, which aggravates the possibility of wear and collision of sealing rings.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Thermodynamics
Qiangguo Deng, Pengyun Song, Hengjie Xu, Wenyuan Mao, Xuejian Sun
Summary: The gas film of the carbon dioxide (CO2) spiral groove dry gas seal (S-DGS) is less than 3 μm during startup process, and its opening stability is directly related to the operating performance of S-DGS. The finite difference method is used to numerically solve the pressure distribution of S-DGS considering the slip flow and the real gas effect. The effects of both factors on the startup characteristics of S-DGS are discussed at different structural parameters. The study shows that the slip flow effect inhibits the opening ability of CO2 S-DGS, while the real gas effect enhances it. The lowest startup rotational speed is achieved when the spiral angle is 7.5 degrees, and the highest gas film stiffness occurs at a small spiral angle with a film thickness of 0.6 μm. However, the relationship between groove number and gas film stiffness is complex and depends on the balance film thickness of the startup process. A higher opening ability can be achieved by increasing the balance coefficient reasonably.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
Article
Nuclear Science & Technology
Enbo Zhang, Haicheng Xu, Jing Li, Bofeng Bai
Summary: This study numerically investigated the flow characteristics of supercritical CO2 in stepped labyrinth seals and its effect on the dissipation rate of turbulent kinetic energy and leakage flow rate. The study found that the rotating vortices inside each chamber of the turbomachine significantly increase the turbulent dissipation rate and decrease the leakage flow rate. The seal clearance and the distance between the seal tip and step were also found to be important factors affecting the leakage flow rate.
PROGRESS IN NUCLEAR ENERGY
(2022)
Article
Engineering, Mechanical
Juanjuan Zhu, Xiangwei Li, Scott Beamish, Rob S. Dwyer-Joyce
Summary: In this study, ultrasound was used to analyze the formation of the oil film on a rubber O-ring during reciprocating sliding. The results showed that ultrasound is an effective method for detecting oil film formation and contact size.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Aerospace
Qianlei Gu, Zhengfeng Wu, Jiangang Yang, Wanfu Zhang, Mingjie Zhang
Summary: This paper proposes a novel flow control method using the helical gas curtain generator (HGCG) to reduce the leakage of annular gas seals. Numerical investigations show that this method effectively enforces flow resistance at teeth tips, resulting in a higher leakage reduction ratio and effective damping coefficient compared to traditional air curtain technology.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Xiao-Ying Li, Zhen-Tao Li, Mu-Ming Hao, Qing-Yang Wang, Zeng-Li Wang
Summary: The purpose of this paper is to investigate the hydrodynamic performance of liquid film seals with oblique grooves and spiral grooves, considering cavitation, and compare and analyze the differences between them. By solving the incompressible steady-state Reynolds equation, the sealing performance parameters of the liquid film seal with oblique groove and spiral groove were obtained. The study found that the hydrodynamic performance of the oblique groove seal and spiral groove seal shows a similar trend with the change of operating parameters.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Songtao Hu, Xiaobao Cao, Tom Reddyhoff, Debashis Puhan, Sorin-Cristian Vladescu, Qian Wang, Xi Shi, Zhike Peng, Andrew J. deMello, Daniele Dini
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Engineering, Mechanical
Jun Wen, Tom Reddyhoff, Songtao Hu, Debashis Puhan, Daniele Dini
TRIBOLOGY INTERNATIONAL
(2020)
Article
Thermodynamics
Yuan Yin, Xiangfeng Liu, Weifeng Huang, Ying Liu, Songtao Hu
ADVANCES IN MECHANICAL ENGINEERING
(2020)
Article
Chemistry, Physical
Songtao Hu, Tom Reddyhoff, Debashis Puhan, Sorin-Cristian Vladescu, Xi Shi, Daniele Dini, Zhike Peng
APPLIED SURFACE SCIENCE
(2020)
Article
Multidisciplinary Sciences
Songtao Hu, Xiaobao Cao, Tom Reddyhoff, Debashis Puhan, Sorin-Cristian Vladescu, Jing Wang, Xi Shi, Zhike Peng, Andrew J. DeMello, Daniele Dini
Article
Chemistry, Physical
Sorin-Cristian Vladescu, Sophie Bozorgi, Songtao Hu, Stefan K. Baier, Connor Myant, Guy Carpenter, Tom Reddyhoff
Summary: The study found that carbonated water plays an important role in mouthfeel and taste perception, with CO2 cavities forming in the mouth upon entry, limiting flow and reducing pressure, resulting in increased friction and improved taste. Carbonated water was also found to be more effective than non-carbonated water in removing oral mucosal pellicle, which also increased friction.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Songtao Hu, Xiaobao Cao, Tom Reddyhoff, Xi Shi, Zhike Peng, Andrew J. deMello, Daniele Dini
Summary: A flexibility-patterned design is proposed to enhance liquid repellency and accelerate liquid evaporation in this study, bridging the gap between rigidity-based and flexibility-based strategies in liquid-repelling applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Songtao Hu, Tom Reddyhoff, Jinbang Li, Xiaobao Cao, Xi Shi, Zhike Peng, Andrew J. DeMello, Daniele Dini
Summary: Researchers have designed a flexible surface inspired by the mushroom-like geometry found on springtail cuticles, which enhances water repellency for impacting droplets and robustly endures tribological friction. This surface also creates a flexibility gradient to directionally manipulate droplets, paving the way for droplet transport.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Mechanical
Songtao Hu, Weifeng Huang, Jinbang Li, Tom Reddyhoff, Xiaobao Cao, Xi Shi, Zhike Peng, Andrew Demello, Daniele Dini
Summary: The study introduces a rigid-flexible hybrid surface design that enables fast droplet sliding and waterproof performance, and retains its water-repellent properties even after a certain number of wear cycles.
Article
Agronomy
Yinghua Wang, Songtao Hu, He Ren, Wanneng Yang, Ruifang Zhai
Summary: This study developed a low-cost and open-access 3D phenotyping pipeline for calculating phenotypic traits of tomato plants throughout their lifecycle. The pipeline was tested and showed promising results for plant breeding, cultivation research, and functional genomics.
Article
Engineering, Multidisciplinary
Chao Liu, Xiaolong Ma, Tianyu Han, Xi Shi, Chengjin Qin, Songtao Hu
Summary: The convolutional neural network (CNN) has made significant progress in intelligent fault diagnosis research over the past decade. However, its weak interpretability and poor domain generalization capability have hindered its application in industrial practice. To address these issues, this study proposes an interpretable domain generalization diagnosis model called NTScatNet, which effectively characterizes the cyclostationarity information of fault signals across different transmission paths. Experimental results demonstrate the domain generalization ability of NTScatNet on various transfer diagnosis tasks.
Article
Chemistry, Physical
Songtao Hu, Tianyu Han, Youchao Qi, Chi Zhang, Xi Shi, Zhike Peng
Summary: In this study, a self-sensing solution is proposed using triboelectric nanogenerators (TENGs) as self-aware measurement points in a multi-span rotor system. Deep learning is employed to analyze the triboelectric current signals, and ResNet 18 is found to be effective in extracting feature patterns for misalignment fault identification with a diagnostic accuracy of 90.28%. This is the first demonstration of TENGs for misalignment fault identification in a multi-span rotor system, providing a promising approach for health condition monitoring.
Article
Chemistry, Physical
Songtao Hu, Xijia Ding, Beibei Fan, Chi Zhang, Bo Zhang, Xi Shi, Zhike Peng
Summary: This study reports a solid-liquid triboelectric nanogenerator (TENG) sensing technique for position sensing of inkjet printing. A self-aware array assembled by four single-electrode-mode TENG units can achieve droplet positioning based on the triboelectric output. The open-circuit voltage is considered as the key index to precisely characterize the deposition positioning of jetting droplets.
Article
Engineering, Mechanical
Haoran Li, Tianyu Han, Hui Hu, Xi Shi, Zhike Peng, Songtao Hu
Summary: Researchers have discovered that the surface topography of sliding Triboelectric Nanogenerators (TENGs) significantly influences frictional electrification. They have investigated the impact of a single-stratum topography and found a shared reality in stratified topographies. They have characterized the stratified feature of topographies and linked it to electrification voltages, leading to the development of a stratified electrification model. They have also used machine learning techniques to identify stratified topographic characteristics with frictional electrification signals, which can be used as a tool for topography measurement.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Nanoscience & Nanotechnology
Xiaobao Cao, Quan Gao, Shangkun Li, Songtao Hu, Jing Wang, Peter Fischer, Stavros Stavrakis, Andrew J. deMello
ACS APPLIED MATERIALS & INTERFACES
(2020)
