Review
Green & Sustainable Science & Technology
Z. Rasep, M. N. A. W. Muhammad Yazid, S. Samion
Summary: Vegetable oils are seen as potential bio lubricants that could replace traditional mineral oils in the future, offering unique environmental benefits. Surface modification of journal bearings has gained attention for its ability to enhance performance. The combination of textured journal bearings and vegetable oil shows promise for various industrial applications.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Engineering, Mechanical
Mohammad Tauviqirrahman, J. Jamari, Arjuno Aryo Wicaksono, M. Muchammad, S. Susilowati, Yustina Ngatilah, Caecilia Pujiastuti
Summary: In this study, a computational investigation into the acoustic and tribological performances in journal bearings is presented, using a heterogeneous pattern with rough surfaces engineered in certain regions. Numerical results show that heterogeneous rough/smooth bearings can provide lower noise and larger load-carrying capacity compared to conventional bearings, with discussions on the effects on friction force.
Article
Engineering, Mechanical
Nur Cahyo, P. Paryanto, Ariyana Dwiputra Nugraha, Arionmaro Simaremare, Indra Ardhanayudha Aditya, Bara Songka Laktona Siregar, Mohammad Tauviqirrahman
Summary: This study aims to improve the tribological and acoustic performance of journal bearings by introducing engineered roughness on the bearing surface. The findings demonstrate that engineered roughness has a significant effect on the tribological performance of the bearing under non-Newtonian lubrication, while having minimal impact on the bearing noise.
Article
Mechanics
Chuong Nguyen Hoang-Trong, Cuong Mai Bui, Thinh Xuan Ho
Summary: By using a numerical approach, the flow characteristics of kaolinite suspension in a lid-driven cavity were studied, showing that larger aspect ratios result in significantly larger static rigid zones, with two primary vortices rotating in opposite directions formed in deep cavities.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2021)
Article
Biotechnology & Applied Microbiology
Cristian Inostroza, Alessandro Solimeno, Joan Garcia, Jose M. Fernandez-Sevilla, F. Gabriel Acien
Summary: The design and hydrodynamics of a 500 m(2) raceway bioreactor were optimized using Computational Fluid Dynamics (CFD). The study confirmed that using deflectors in the baffle partition bend type provided the best performance, with a monophasic analysis validating the optimal configuration dynamics. Results from a multiphasic analysis with ANSYS Fluent showed that at 18 rpm, average liquid velocity stabilized at 0.38 m.s(-1), indicating a robust starting point for improving large-scale raceway reactors.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Engineering, Multidisciplinary
Mohammad Tauviqirrahman, P. Paryanto, Ben Oni Pugastri, Andreas Partogi Hamonangan, M. Muchammad, Eflita Yohana, J. Jamari
Summary: The aim of this study is to investigate the performance of a fluid dynamic journal bearing lubricated with Bingham plastic using computational fluid dynamics (CFD) considering roughness and cavitation. The introduction of an engineered partial roughness pattern improves tribological and acoustic performances under different roughness levels and eccentricity ratios. The numerical results demonstrate that surface roughness level significantly affects load-carrying capacity, and higher roughness levels result in lower load-carrying capacity. Moreover, using roughness on the bearing leads to a 5% reduction in noise level and a 2% reduction in friction force compared to bearings without roughness. These findings highlight the potential of artificial partial roughness to enhance journal bearing indices.
COGENT ENGINEERING
(2023)
Article
Construction & Building Technology
Raoudha Sassi, Ahmed Jelidi, Sami Montassar
Summary: This paper numerically simulates the flow of fresh concrete in the L-box apparatus to gain insights into its rheological behavior and predict its properties. A three-dimensional model using computational fluid dynamics technique is developed, assuming the flow behavior of fresh concrete to be non-Newtonian. Parameter studies are conducted to examine the impact of yield stress, viscosity, and density on the concrete flow.
MAGAZINE OF CONCRETE RESEARCH
(2023)
Article
Engineering, Marine
Cuong Mai Bui, Thinh Xuan Ho
Summary: This study numerically investigates the flow characteristics of kaolinite mixed with water passing a cylinder near a moving wall. The results show that the flow regime is influenced by the gap ratio, Reynolds number, and Bingham number. At small gaps, the drag and lift coefficients increase with decreasing gap size.
Article
Chemistry, Multidisciplinary
Brahim Mebarki, Keddar Mohammed, Mariam Imtiaz, Draoui Belkacem, Marc Medal, Kada Benhanifia, Wasim Jamshed, Mohamed R. Eid, Sayed M. El Din
Summary: This study investigates the laminar steady-state free convection in a square cavity with differential heated side walls, focusing on the hydro-thermal features and their relationship with various parameters. The results show that increasing the Rayleigh number promotes convection and enhances heat transfer efficiency, while increasing the Bingham number inhibits convection and decreases heat transfer efficiency. Moreover, increasing the phase difference, amplitude ratio, and Rayleigh number all contribute to higher heat transfer rates.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Engineering, Multidisciplinary
Persis Rofail, Rola Afify, Hassan El-Gamal
Summary: This research experimentally created a transparent facemask prototype to maintain warmth in the sinus area to prevent sinusitis disease. Through numerical simulations and experimental validation, it was confirmed that the mask design is effective in improving temperature and comfort.
AIN SHAMS ENGINEERING JOURNAL
(2021)
Article
Engineering, Mechanical
Mohammad Tauviqirrahman, J. Jamari, Muhammad Bagir, Wahyu Caesarendra, P. Paryanto
Summary: This study investigates the tribological and acoustic behavior of water-lubricated journal bearing using a comprehensive simulation method. The results show that bearing deformation has a significant impact on tribological characteristics, while bearing noise is weakly sensitive to bearing material. Additionally, the study discusses the effect of operating conditions on acoustic and tribological performance.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Engineering, Marine
S. Lovato, A. Kirichek, S. L. Toxopeus, J. W. Settels, G. H. Keetels
Summary: This study investigates the accuracy of the Bingham model for numerical predictions of the viscous forces on a plate moving through fluid mud. Results suggest that the regularized Bingham model can be a reasonable compromise between simplicity and accuracy for investigating the effect of muddy seabeds on marine vessels using CFD simulations.
Article
Multidisciplinary Sciences
A. Ganesha, Albin Joseph, Raghuvir Pai, Shah Mohammed Abdul Khader, Nitesh Kumar, Shiva Kumar, H. Girish
Summary: The importance of preserving the ecological balance has led to the development of water lubricated bearings for various applications, including marine vessels. In this study, a water lubricated journal bearing model with a partial slip/no slip pattern was analyzed using CFD. The results showed that the number of grooves and groove angle are the most influential parameters affecting the load-carrying capacity of the bearing.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Hongbai Chen, He Liang, Wenzhong Wang, Shengguang Zhang
Summary: This study establishes a transient air-oil two-phase flow model in a ball bearing using computational fluid dynamics (CFD), and validates the accuracy and feasibility of this model through experiments. The findings suggest that the distribution of oil and the behavior of air-oil flow in a ball bearing are closely related to the speed and the ratio of oil viscosity to air-oil surface tension. The capillary number may serve as the boundary and critical point for flow pattern transition between different flow patterns in bearings.
Article
Engineering, Multidisciplinary
Mohammad Tauviqirrahman, Eflita Yohana, Paryanto, Jamari, Fauzan Syukri Muslim, Paulus Wisnu Anggoro
Summary: In this study, the possibility of using a heterogeneous rough/smooth surface design for lubricated journal bearing improvement was explored using computational fluid dynamics. The optimal surface roughness level, cavitation pressure, and journal length to diameter ratio were determined through a parametric analysis. The main finding is that the heterogeneous rough/smooth bearing increased the load-carrying capacity and reduced frictional forces and acoustic power, but had negligible effect on the maximum temperature.
RESULTS IN ENGINEERING
(2023)
Article
Engineering, Mechanical
Busra Duran, Jerome Cavoret, David Philippon, Fabrice Ville, Arnaud Ruellan, Frank Berens
Summary: This study analyzes the changes in the physicochemical properties and tribological performances of gear transmission oils during field operation, finding differences from traditional engine oils.
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)
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
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
Kaikui Zheng, Youxi Lin, Tingzheng Lai, Chenghui Gao, Ming Liu, Zhiying Ren
Summary: The study investigated the use of waste foundry resin-bonded sand as a substitute for copper in resin-based brake material. It found that the waste sand was more favorable for improving the overall friction and wear properties of the material compared to copper. Waste sand benefited the material by forming a friction layer, leading to increased friction coefficient and stability. Brake material with 10-15% waste sand showed excellent heat-fade resistance.
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
Engineering, Mechanical
Tomohiro Toyoda, Ryo Yasuike, Toshihiro Noda
Summary: In this study, a elasto-plastic constitutive model of friction incorporating the concept of superloading surface was developed based on the subloading friction model. The proposed model achieves a smooth transition of friction by describing the evolution rule of structure, treating the state with static friction coefficient larger than kinetic friction coefficient as the bulkiness of structure. The positive definiteness of the plastic multiplier, loading condition, and material parameters were derived, and the validity of the proposed model in accordance with the subloading-friction model was confirmed through a stick-slip simulation of a mass-spring system.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
P. Balaji, B. Surya Rajan, K. Sathickbasha, P. Baskara Sethupathi, Deviga Magadevan
Summary: This study emphasizes the importance of using a variety of solid lubricants with different oxidation temperature regimes to enhance the tribological performance of brake pads.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Jian Ma, Yancong Liu, Javad Mostaghimi, Na Zhang
Summary: This paper investigates the influence of preparation strategies on the lubrication properties of surface textures. Three laser scanning strategies are proposed to achieve a sinusoidal textured surface, and the evolution of surface structure and chemical composition is discussed. The findings show that ridge structures enhance anti-wear properties but also increase the friction coefficient. However, the oil cover preparation method prevents the formation of ridges and improves wettability.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Mohammad Roostaei, Arvin Taghizadeh Tabrizi, Hossein Aghajani
Summary: In this research, the Al2O3/MoS2 nanocomposite coating layer was successfully applied on the surface of Ti-6Al-4 V alloy. The relation between the surface characteristics and wear resistance of the coating was studied using atomic force microscopy analysis and pin-on-disk wear test method. The results showed that the nanocomposite coating significantly reduced the wear rate and provided an equation to calculate the Lancaster coefficient.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Musa Bilgin, Sener Karabulut, Halil Karakoc, Yunus Kayir, Murat Sarikaya
Summary: This study investigates various methods to improve the machinability efficiency of Inconel 718 alloy while considering their effect on microstructural properties. The results show that hot+PMQL, hot+SiCNMQL, and hot+Al2O3-NMQL contribute significantly to the improvement of machinability characteristics. The EBSD analysis also reveals that a limited area is affected by heat in the hot machining environment and that the removal of the heated layer during milling process helps preserve the microstructure.
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
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)