Article
Engineering, Mechanical
Shaoqing Qin, Lida Zhu
Summary: In this paper, the surface and subsurface damage of laser assisted grinding CrCoNi medium entropy alloys were investigated using molecular dynamics simulations. The results showed that the application of laser energy can reduce cutting forces and minimize subsurface damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Dayang Li, Fanhao Zhou, Yutong Gao, Kun Yang, Huimin Gao
Summary: This article introduces a continuous prediction model based on deep learning for predicting the power output of steam turbines. The model uses long short term memory (LSTM) method to develop a trend prediction model and optimizes the prediction model through feature selection method. Experimental results show that the model outperforms other models in terms of prediction performance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Thermodynamics
Junhong Hao, Tengyu Ma, Jinglong Zhou, Huimin Wei, Yanqiang Kong, Xiaoze Du
Summary: This paper focuses on optimizing the design of proton exchange membrane fuel cells (PEMFCs). A three-dimensional mathematical model of PEMFC is established and simulation data under different structural parameters are collected. By analyzing the simulation data, a mapping relationship between the thickness of the diffusion layer and the output power is derived using response surface analysis. The optimal structural parameters are obtained through the BP neural network. The results show that the fuel cell using a gradient diffusion layer has improved performance compared to using a conventional diffusion layer, including increased average power, overall heat transfer capacity, and oxygen utilization. Furthermore, the paper finds that the fuel cell with a tapered diffusion layer has better synergistic performance in temperature and concentration fields, as well as temperature and velocity fields.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Guillaume Lambou Ymeli, Yan-Yan Feng, Cun-Hai Wang
Summary: This study focuses on the transient radiative transport in irregular geometries of inhomogeneous semitransparent graded-index media. The lattice Boltzmann method and finite volume method are utilized to accurately solve the radiative transfer and analyze its parameters in irregular domains.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Zhiming Xu, Xiangdong Zhou, Yunfeng Qiu, Jie Xu, Debin Shan, Bin Guo
Summary: In this study, N-doped carbon nanocoatings were prepared on Cu oxide cones by assembly and subsequent pyrolysis of polydopamine. The modified Cu substrate with NC coated Cu oxides showed significantly enhanced boiling heat transfer performance. The vertically-oriented in-plane heat dissipation direction, abundant nucleation sites, and superhydrophilicity of the NC coating synergistically improved the boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Engineering, Mechanical
Pradip Kumar Verma, Alok Singh
Summary: This study investigates the mechanical properties and wear resistance of CoMoMnNiV high entropy alloy reinforced aluminium matrix composite processed through stir-squeeze casting assisted with an ultrasonic transducer. The results show significant improvements in mechanical properties and wear resistance, with the composite containing 8 wt% HEA demonstrating the highest resistance to wear. Optical microscopy, SEM, and an optical profilometer were used for a thorough examination of the microstructure and worn surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Zhenghai Yang, Yingjian Song, Jinlong Jiao, Wenbo Li, Bao Shangguan, Yongzhen Zhang
Summary: This study investigated the friction, wear properties, and current-carrying properties of copper-graphite composites paired with brass C28000. The results showed that the current-carrying properties of the composite materials were excellent, but their wear rate was the main limiting factor. Furthermore, an increase in the thickness of the graphite layer led to an improvement in the uniformity of damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Moustafa Mahmoud Yousry Zaghloul, Karen Steel, Martin Veidt, Michael T. Heitzmann
Summary: This research evaluates and compares the impact of different material types on the tribological characteristics of Polyamide 6 composites, and finds that glass fiber-reinforced Polyamide 6 exhibits better friction and wear performance under high-pressure velocity factors.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Thermodynamics
Rukun Hu, Xinyu Huang, Xinyu Gao, Liu Lu, Xiaohu Yang, Bengt Sund
Summary: This study examines the impact of applying bottom cross-cut on PCM's spatial distribution in a horizontal LHTES unit using numerical simulation. The findings show that bottom cross-cut can improve the heat storage rate and natural convection heat transfer gain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weikang Li, Wenting Zhang, Xiaoyu Huang, Xing Mu, Yuxiang Ni
Summary: Nanophononic materials have the potential to achieve low thermal conductivity through the phenomenon of phonon resonance. In this study, silicon nanofilms with resonant pillars were investigated, and it was found that the thermal conductivity reduction depends on the thickness of the nanofilms and the geometry of the pillars. Additionally, void defects on the pillars were identified to increase the thermal conductivity.
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
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
Engineering, Mechanical
Benjamin Weiland, Floriane Leclinche, Anis Kaci, Brigitte Camillieri, Betty Lemaire-Semail, Marie -Ange Bueno
Summary: This study presents a systematic approach to generating control signals for a tactile simulator that simulate the touch of textile fabrics. By using a friction modulation tactile surface and acquiring forces from real surfaces with artificial finger mimicking fingerprints, control signals are generated and processed in the frequency domain before sending them to the tactile stimulator. The study focuses on the potential benefits of incorporating fingerprint information in fabric simulations to achieve a more realistic tactile perception. A sensory analysis with 36 participants using the generated control signals showed better discrimination without fingerprint information.
TRIBOLOGY INTERNATIONAL
(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
Weixin Zhang, Yehang Xie, Yuqiang Ding, Zhao Liu, Zhenping Feng
Summary: This study investigated the impact of upstream slot leakage on the endwall film cooling characteristics of turbine blades. Pressure Sensitive Paint (PSP) technology was used to measure the film cooling characteristics, and numerical analysis was conducted to evaluate the aerodynamic performance. It was found that increasing the mass flow ratio of the upstream slot enhanced film cooling, decreased aerodynamic losses, and reduced the strength of passage vortex. However, reducing the distance between the slot and the blade leading edge only enhanced film cooling without affecting the leakage coverage area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Engineering, Mechanical
Ji Lang, Qianqian Wang
Summary: This study fills the theoretical gap in the field of squeezing flow within a thin porous gap driven by a moving boundary by introducing Fourier transforms, considering porous media effects, and handling arbitrary moving boundaries. It provides a robust framework for research and development in the field of squeezing flow dynamics.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Q. Gao, Y. Fan, Y. G. Wu, J. L. Liu, J. Wang, L. Li
Summary: Fretting wear significantly affects the hysteresis behavior of the contact surface and leads to joint degradation. This study investigates the influence of harmonic normal force on the evolution of interface morphology and contact parameters with fretting wear. The results show that the harmonic normal force can significantly influence the hysteresis loop and the energy dissipation distribution on the contact surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Thermodynamics
Shubham P. Chitriv, Ketaki Dharmadhikari, A. Nithin, Akshay S. Archak, R. P. Vijayakumar, Glen Cletus Dsouza
Summary: This study synthesized PCM composites with UMCNOs and PEG through melt mixing method, and investigated the effects of UMCNOs loading on their properties. The results showed that the addition of UMCNOs can significantly enhance the thermal conductivity and thermal energy storage and release rates of the PCM composites, with negligible impact on phase change properties. This suggests great prospects for latent heat energy storage applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Engineering, Mechanical
Hao Wang, Guolin Yang, Hao Su, Zhigang Dong, Xiaoguang Guo, Yan Bao, Pengfei Zhang
Summary: This study investigated the surface forming mechanism during ultrasonic elliptical vibratory cutting of tungsten alloy using scratching experiments and molecular dynamics simulations. The results showed that this cutting method produced smoother surfaces with less roughness and visible plastic flow compared to ordinary cutting. The cutting stress in ultrasonic elliptical vibratory cutting exceeded the stress threshold required for slip system activation, resulting in a higher surface dislocation density and favorable plastic deformation.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Baocheng Liu, Hongsheng Chen, Jun Zhou, Jing Wang, Wenxian Wang, Xiaochun Chen, Sanxiao Xi
Summary: This study used fast hot pressing sintering to fabricate WC/AlCoCrFeNi2.1 metal matrix composites (MMCs). It was found that the addition of reinforced particles increased the microhardness, nanoindentation and wear resistance of the MMCs. During frictional processes, an oxide film formed, providing material protection, enhancing stability and reducing friction-induced losses.
TRIBOLOGY INTERNATIONAL
(2024)
