Article
Thermodynamics
G. Mishra, A. Memon, Anoop K. Gupta, N. Nirmalkar
Summary: This study investigates the melting and heat transfer characteristics of an isothermally heated cylinder placed in differently shaped enclosures. The results show that simple modifications in the enclosure's geometry can significantly reduce the melting time, expediting the energy storage process. This is beneficial for reducing energy losses and increasing industrial margins.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Burak Izgi
Summary: This study investigates the melting dynamics of PCM filled in a closed vertical cylinder under microgravity and compares it with the melting dynamics under gravity. The results show that the melting performance is slower in microgravity, but can be accelerated by inserting fins.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Vahid Safari, Hossein Abolghasemi, Leila Darvishvand, Babak Kamkari
Summary: This study evaluates the combined effect of fin configuration and eccentricity of heat transfer tube on the melting behavior of phase change material (PCM) inside shell and tube heat exchangers. Experimental findings show that the eccentric tube HX and bifurcated fin configuration can significantly reduce melting time, while numerical simulations indicate that bifurcations increase total heat transfer rate.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Banumathi Munuswamy Swami Punniakodi, Ramalingam Senthil
Summary: This study investigates the use of phase change materials (PCM) in thermal energy storage, focusing on reducing melting duration by modifying the design of helical heat transfer tubes (HTT) in a vertical cylindrical TES unit. Adjusting the HTT structure can improve melting efficiency, and optimal thermal storage parameters can be determined under different flow rates and temperatures.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Engineering, Multidisciplinary
Mohamed A. Alnakeeb, Walaa M. Galal, M. Elsayed Youssef, Medhat M. Sorour
Summary: This study investigates the optimum design parameters for phase-change energy storage systems, focusing on the melting process. The research shows that the new elliptical design of the inner tube can significantly enhance the average melting rate.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Islam A. Hassan, Ramy H. Mohammed, Haitham S. Ramadan, Mohamed A. Saleh, Fermin Cuevas, Daniel Hissel
Summary: This paper proposes a multi-layer cylindrical reactor with metal hydride (MH) and phase change material (PCM) alternately arranged to solve the heat management problem of MH. Through numerical modeling and validation, it is found that the reactor using lithium nitrate trihydrate as PCM material has the best performance, reducing reactor volume while slightly delaying absorption time. The specific capacity rate (SCR) and volumetric capacity rate (VCR) of the proposed reactor are 3.4 and 3.12 times higher than the corresponding values in literature.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Jiangwei Liu, Zunpeng Liu, Changda Nie
Summary: This paper proposes the circumferential arrangement of multiple PCMs in a finned concentric tube thermal energy storage system to improve phase transition uniformity. Numerical studies show that using multiple PCMs can shorten the melting-solidification time, with the optimal case saving 14.7% compared to using a single PCM.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Mechanics
Thumitha Mandula Higgoda, Mohamed Elchalakani, Mehrdad Kimiaei, Adam Wittek, Bo Yang
Summary: This paper presents an experimental investigation of pultruded GFRP CHS columns under concentric and eccentric compression. Different slenderness values and eccentricities were considered. Longitudinal splitting and localized delamination buckling were observed as the main failure modes. The load-carrying capacities of the concentric column under different slenderness values were compared with design rules. Under eccentric loading, the ultimate loads decrease with increasing eccentricity and slenderness, while the load-strain behavior shows non-linear characteristics due to geometric non-linearity. The FE models predicted the failure modes well, with material splitting due to hoop matrix tensile rupture.
COMPOSITE STRUCTURES
(2023)
Article
Thermodynamics
Jianqiang Wang
Summary: The present study uses Smoothed Particle Hydrodynamics to analyze the melting process inside a multi-tube horizontal container. The Lagrangian method simplifies the moving boundary and phase change calculations, while the enthalpy method and Boussinesq assumption are used to solve the melting and natural convection problems. The results show that natural convection enhances the overall thermal performance, and a higher Rayleigh number increases the melting speed and energy storage. The melting rate is faster in the upper region due to buoyancy force. The thermal performance is more sensitive to distance rather than the angle between inner tubes in the multi-tube configuration, with a larger distance leading to weakened stratification and shorter melting time.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Takashi Morimoto, Hiroyuki Kumano
Summary: PCM emulsions (PCMEs) with high fluidity and thermal energy storage density have attracted attention for their potential use in thermal energy storage and transport. This study experimentally investigated the natural convection and heat transfer characteristics of PCMEs in a rectangular vessel. Multiple convection layers were observed in PCMEs due to the phase change of PCM particles. The aspect ratio of the vessel did not affect the formation of multiple convection layers. Heat transfer was promoted in PCMEs when accompanied by a PCM particle phase change, and the effect was most remarkable when the aspect ratio was 3.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Shuai Zhang, Hongtao Gao, Yuying Yan
Summary: This study provides atomic insights into the melting behaviors of phase change materials confined in nanospace through molecular dynamics simulations. The research reveals that the nanoconfined phase change materials undergo morphology evolution and become disordered after melting. Additionally, the study discusses the influence of nanoconfinement on the melting point and latent heat of phase change materials.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Energy & Fuels
Sourav Chatterjee, Dipankar Bhanja, Sujit Nath
Summary: This numerical study analyzes the melting behavior of three phase change materials, namely Lauric acid, paraffin wax, and n-Octadecane, in trapezoidal-shaped cavities with inner heated tubes. The study investigates the influence of the angular variation of the containers and the position of the tubes on the melting rate and heat transfer process of the phase change materials. The results demonstrate that the shape of the cavity and proper positioning of the inner tube can significantly affect the melting phenomenon and improve the charging rate.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
G. Mishra, P. Mishra, R. P. Chhabra
Summary: This study numerically investigates the laminar free convection in yield-pseudoplastic fluids in concentric and eccentric cylindrical annuli. The findings reveal that the eccentric positioning of the heated cylinder enhances heat transfer, while the horizontal shifting of the inner cylinder to an off-centre position has an adverse effect on heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Takashi Morimoto, Motoki Sugiyama, Hiroyuki Kumano
Summary: Heat transfer experiments were conducted in a horizontal circular tube using phase change material emulsions, revealing temperature distribution and enhanced Nusselt number at the upper position of the tube when phase change material particles melted. The Nusselt number of the emulsion was found to be about 2.5 times higher than that of single-phase fluid. No temperature distribution was observed when the emulsion flowed upward, even with phase change material particle melting.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Cheng Li, Alaa Mohammed Hussein Wais, As'ad Alizadeh, Majid Mokhtari, Waleed Khalid Al-Azzawi, Noor Qusay Abdul-sahib, Mahmoud Shamsborhan, Holya A. Lafta, Marwah A. Shams, Makram Skikara, Beneen M. Hussien, Maboud Hekmatifar
Summary: This study used innovative fins that combine parallelogram and rectangular shapes to investigate the melting behavior of phase change materials (PCM). The results showed that the geometry of model E had the best performance, achieving complete melting in the shortest time.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Mehdi Esapour, Arash Hamzehnezhad, A. Ali Rabienataj Darzi, Mahmoud Jourabian
ENERGY CONVERSION AND MANAGEMENT
(2018)
Article
Thermodynamics
Hamed Mousavi, A. Ali Rabienataj Darzi, Mousa Farhadi, Mohamad Omidi
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2018)
Article
Physics, Multidisciplinary
Mahmoud Jourabian, A. Ali Rabienataj Darzi, Davood Toghraie, Omid Ali Akbari
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2018)
Article
Thermodynamics
Mohamad Omidi, Mousa Farhadi, A. Ali Rabienataj Darzi
ENERGY CONVERSION AND MANAGEMENT
(2018)
Article
Thermodynamics
Fahimeh Khanmohammadi, Mousa Farhadi, A. Ali Rabienataj Darzi
HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Adel Pourakabar, A. Ali Rabienataj Darzi
APPLIED THERMAL ENGINEERING
(2019)
Article
Materials Science, Multidisciplinary
S. Morteza Mousavi, A. Ali Rabienataj Darzi, Omid Ali Akbari, Davood Toghraie, Ali Marzban
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2019)
Article
Thermodynamics
Mohamad Omidi, A. Ali Rabienataj Darzi, Mousa Farhadi
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2019)
Article
Thermodynamics
S. Morteza Mousavi, Mohit Biglarian, A. Ali Rabienataj Darzi, Mousa Farhadi, Hamid Hassanzadeh Afrouzi, Davood Toghraie
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Engineering, Multidisciplinary
S. Morteza Mousavi, A. Ali Rabienataj Darzi, Ming Li
Summary: This study numerically investigates the behavior of ferrofluids in the presence of neodymium block magnets, finding that the magnet significantly affects flow field and heat transfer, with the creation of secondary flow being more significant for low Reynolds numbers.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Thermodynamics
A. Ali Rabienataj Darzi, S. Morteza Mousavi
Summary: This study presents a method for improving the charging and discharging rates in thermal energy storage units by applying a magnetic field. The effectiveness of this method is demonstrated through experimental and numerical data. By placing the wire in appropriate locations, higher efficiency can be achieved in both the charging and discharging processes.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
F. Y. Mahmoudi, M. Farhadi, A. A. Rabienataj Darzi
Summary: In this study, a numerical investigation is carried out on using an anti-icing system by hot air extracted from the compressor for the Nowshahr 460 MW combined cycle power plant. The results show that increasing the hot air flow rate, number of injection nozzles, and anti-icing tubes can decrease the possibility of ice formation on the filter surfaces. Increasing the number of nozzles from six to ten leads to a 2°C increase in the average surface temperature of the filters and a 152% increase in the outlet temperature of the air intake. Ice formation is significantly reduced when two anti-icing tubes are used instead of one.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Mohammad Hassan Shojaeefard, Mahmoud Jourabian, Ahmad Ali Rabienataj Darzi
Summary: Investigation on ice melting in a square cavity with partially active walls suggests dispersing hybrid alumina-Cu and silica-multiwalled carbon nanotubes nanoparticles for enhancing thermal performance. The use of different nanoparticles can significantly reduce the complete melting time in various scenarios, with implications for thermal energy storage systems.
Article
Thermodynamics
Abolfazl Aghaie, A. Ali Rabienataj Darzi
HEAT TRANSFER-ASIAN RESEARCH
(2019)
Article
Thermodynamics
A. A. Rabienataj Darzi, H. Hassanzadeh Afrouzi, Ebrahim Alizadeh, Vahid Shokri, Mousa Farhadi
HEAT TRANSFER-ASIAN RESEARCH
(2017)
Article
Engineering, Multidisciplinary
A. A. Aganin, A. I. Davletshin
Summary: A mathematical model of interaction of weakly non-spherical gas bubbles in liquid is proposed in this paper. The model equations are more accurate and compact compared to existing analogs. Five problems are considered for validation, and the results show good agreement with experimental data and numerical solutions. The model is also used to analyze the behavior of bubbles in different clusters, providing meaningful insights.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Hao Wu, Jie Sun, Wen Peng, Lei Jin, Dianhua Zhang
Summary: This study establishes an analytical model for the coupling of temperature, deformation, and residual stress to explore the mechanism of residual stress formation in hot-rolled strip and how to control it. The accuracy of the model is verified by comparing it with a finite element model, and a method to calculate the critical exit crown ratio to maintain strip flatness is proposed.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Shengwen Tu, Naoki Morita, Tsutomu Fukui, Kazuki Shibanuma
Summary: This study aimed to extend the finite element method to cope with elastic-plastic problems by introducing the s-version FEM. The s-version FEM, which overlays a set of local mesh with fine element size on the conventional FE mesh, simplifies domain discretisation and provides accurate numerical predictions. Previous applications of the s-version FEM were limited to elastic problems, lacking instructions for stress update in plasticity. This study presents detailed instructions and formulations for addressing plasticity problems with the s-version FEM and analyzes a stress concentration problem with linear/nonlinear material properties.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Bo Fan, Zhongmin Wang
Summary: A 3D rotating hyperelastic composite REF model was proposed to analyze the influence of tread structure and rotating angular speed on the vibration characteristics of radial tire. Nonlinear dynamic differential equations and modal equations were established to study the effects of internal pressure, tread pressure sharing ratio, belt structure, and rotating angular speed on the vibration characteristics.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
X. W. Chen, Z. Q. Yue, Wendal Victor Yue
Summary: This paper examines the axisymmetric problem of a flat mixed-mode annular crack near and parallel to an arbitrarily graded interface in functionally graded materials (FGMs). The crack is modeled as plane circular dislocation loop and an efficient solution for dislocation in FGMs is used to calculate the stress field at the crack plane. The analytical solutions of the stress intensity factors are obtained and numerical study is conducted to investigate the fracture mechanics of annular crack in FGMs.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Xumin Guo, Jianfei Gu, Hui Li, Kaihua Sun, Xin Wang, Bingjie Zhang, Rangwei Zhang, Dongwu Gao, Junzhe Lin, Bo Wang, Zhong Luo, Wei Sun, Hui Ma
Summary: In this study, a novel approach combining the transfer matrix method and lumped parameter method is proposed to analyze the vibration response of aero-engine pipelines under base harmonic and random excitations. The characteristics of the pipelines are investigated through simulation and experiments, validating the effectiveness of the proposed method.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Xiangyu Sha, Aizhong Lu, Ning Zhang
Summary: This paper investigates the stress and displacement of a layered soil with a fractional-order viscoelastic model under time-varying loads. The correctness of the solutions is validated using numerical methods and comparison with existing literature. The research findings are of significant importance for exploring soil behavior and its engineering applications under time-varying loads.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Thuy Dong Dang, Thi Kieu My Do, Minh Duc Vu, Ngoc Ly Le, Tho Hung Vu, Hoai Nam Vu
Summary: This paper investigates the nonlinear torsional buckling of corrugated core sandwich toroidal shell segments with functionally graded graphene-reinforced composite (FG-GRC) laminated coatings in temperature change using the Ritz energy method. The results show the significant beneficial effects of FG-GRC laminated coatings and corrugated core on the nonlinear buckling responses of structures.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Zhihao Zhai, Chengbiao Cai, Qinglai Zhang, Shengyang Zhu
Summary: This paper investigates the effect of localized cracks induced by environmental factors on the dynamic performance and service life of ballastless track in high-speed railways. A mathematical approach for forced vibrations of Mindlin plates with a side crack is derived and implemented into a train-track coupled dynamic system. The accuracy of this approach is verified by comparing with simulation and experimental results, and the dynamic behavior of the side crack under different conditions is analyzed.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
James Vidler, Andrei Kotousov, Ching-Tai Ng
Summary: The far-field methodology, developed by J.C. Maxwell, is utilized to estimate the effective third order elastic constants of composite media containing random distribution of spherical particles. The results agree with previous studies and can be applied to homogenization problems in other fields.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Kim Q. Tran, Tien-Dat Hoang, Jaehong Lee, H. Nguyen-Xuan
Summary: This study presents novel frameworks for graphene platelets reinforced functionally graded triply periodic minimal surface (GPLR-FG-TPMS) plates and investigates their performance through static and free vibration analyses. The results show that the mass density framework has potential for comparing different porous cores and provides a low weight and high stiffness-to-weight ratio. Primitive plates exhibit superior performance among thick plates.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Bence Hauck, Andras Szekrenyes
Summary: This study explores several methods for computing the J-integral in laminated composite plate structures with delamination. It introduces two special types of plate finite elements and a numerical algorithm. The study presents compact formulations for calculating the J-integral and applies matrix multiplication to take advantage of plate transition elements. The models and algorithms are applied to case studies and compared with analytical and previously used finite element solutions.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Wu Ce Xing, Jiaxing Wang, Yan Qing Wang
Summary: This paper proposes an effective mathematical model for bolted flange joints to study their vibration characteristics. By modeling the flange and bolted joints, governing equations are derived. Experimental studies confirm that the model can accurately predict the vibration characteristics of multiple-plate structures.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Pingchao Yu, Li Hou, Ke Jiang, Zihan Jiang, Xuanjun Tao
Summary: This paper investigates the imbalance problem in rotating machinery and finds that mass imbalance can induce lateral-torsional coupling vibration. By developing a model and conducting detailed analysis, it is discovered that mass imbalance leads to nonlinear time-varying characteristics and there is no steady-state torsional vibration in small unbalanced rotors. Under largely unbalanced conditions, both resonant and unstable behavior can be observed, and increasing lateral damping can suppress instability and reduce lateral amplitude in the resonance region.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Yong Cao, Ziwen Guo, Yilin Qu
Summary: This paper investigates the mechanically induced electric potential and charge redistribution in a piezoelectric semiconductor cylindrical shell. The results show that doping levels can affect the electric potentials and mechanical displacements, and alter the peak position of the zeroth-order electric potential. The doping level also has an inhibiting effect on the first natural frequency. These findings are crucial for optimizing the design and performance of cylindrical shell-shaped sensors and energy harvesters.
APPLIED MATHEMATICAL MODELLING
(2024)
