Article
Thermodynamics
Digant S. Mehta, Bhavesh Vaghela, Manish K. Rathod, Jyotirmay Banerjee
Summary: The experimental analysis on the heat transfer enhancement in concentric tube type Latent Heat Storage Unit (LHSU) using spiral fins revealed that the provision of fins expedited the melting rate and reduced the time required for energy storage. The maximum reduction in charging time of 51.61% was observed with vertical orientation, while inclined and horizontal orientations offered reductions of 40.97% and 34.1% respectively. Integration of spiral fins may enable the application of LHSU to large scale solar thermal applications.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Rahul Ray, Aurovinda Mohanty, Pandab Patro, Kartik Chandra Tripathy
Summary: This study conducts a performance analysis of branched and interrupted fin heat sinks using numerical simulations to explore the possibility of enhancing heat transfer efficiency. The design that places the secondary fins symmetrically and at the farthest position from the base plate shows the best heat dissipation performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Multidisciplinary Sciences
Adel Almarashi, Amira M. Hussin, M. Mirparizi, Chunwei Zhang, Hosam A. Saad
Summary: In this study, the effect of different shapes and concentrations of nanoparticles on solidification speed was investigated. The results showed that adding nanomaterials and using blade-shaped particles can significantly accelerate the freezing process.
SCIENTIFIC REPORTS
(2022)
Article
Thermodynamics
Liuwei Wang, Ankang Kan, Wei Yu
Summary: This study investigates the melting heat transfer characteristics of phase change material in embedded fin enclosures under hypergravity using the enthalpy-porosity method. The results show that fins greatly accelerate the melting process and hypergravity enhances natural convection and heat transfer performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Xinmei Luo, Jiaan Gu, Hongqiang Ma, Yue Xie, Anying Li, Jiyue Wang, Ruixiang Ding
Summary: The study investigates the melting heat transfer characteristics of PCM in different types of heat exchangers, finding that using combined fractal fins can significantly reduce the complete melting time of PCM. The melting time decreases first and then stabilizes as the bifurcation level number and heat transfer area of the combined fractal fins increase. The fin spacing and heat transfer area have a significant impact on the complete melting time.
JOURNAL OF ENERGY STORAGE
(2022)
Review
Energy & Fuels
Xueliang Zhu, Yan Li, Qunzhi Zhu
Summary: In the process of industrial waste heat recovery, phase change heat storage technology is popular due to its high heat storage density and constant temperature absorption/release process. This paper summarizes the development of new fins in the industry and the optimization results of size, shape, and arrangement. The research shows that multi-branch structure, non-uniform fin array, and targeted fin arrangement can enhance heat transfer.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Green & Sustainable Science & Technology
Ali Tavakoli, Mahmood Farzaneh-Gord, Amir Ebrahimi-Moghadam
Summary: This study evaluates the thermo-hydraulic performance of utilizing sinusoidal internal fins and phase change material (PCM) in LHTES systems. A numerical framework is developed to analyze the geometrical parameters of the fins and investigate different heat transfer and thermodynamic characteristics. The results show that the highest growth of liquid fraction and the lowest entropy generation are achieved in case 4, with H/L = 0.125 and a thickness of 3mm, compared to a case with simple straight fins.
Review
Energy & Fuels
Debasree Ghosh, Joyjeet Ghose, Pulak Datta, Pallavi Kumari, Suraj Paul
Summary: The use of phase change materials (PCMs) is crucial for energy storage and meeting basic needs. Improving the thermal properties of PCMs through additives and encapsulation can enhance their storage capacity. Encapsulated PCMs and PCM composites have shown superior performance in latent heat thermal energy storage.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Prashant Saini, Atul Dhar, Satvasheel Powar
Summary: This study aims to improve the melting performance of a latent heat storage (LHS) system by designing and optimizing the fins. The research finds that natural convection has a significant impact on the melting behaviors, and using improved fin structures and increased number of fins can enhance the melting rate. Additionally, incorporating nanoparticles and metal foam can greatly improve the melting/charging time of the phase change material in the LHS system.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
K. Venkata Krishna, Vivek Pandey, M. P. Maiya
Summary: Metal hydride reactors driven by heat are essential for successful development of metal hydride devices such as H2 storage systems. Nature-inspired leaf-vein type fins have shown good heat transfer capabilities. Optimized designs with inclined fins lead to faster storage capacity attainment, reducing absorption time significantly compared to traditional designs. Operating parameters such as hydrogen supply pressure, inlet temperature, and velocity of the heat transfer fluid greatly influence the performance of the optimized design.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Zhiqiang Sun, Ruijin Fan, Nianben Zheng
Summary: A novel PCM-Fin thermal management system is proposed to significantly prolong the working time of batteries and enhance thermal performance. Experimental and numerical results demonstrate the importance of the proposed heat transfer enhancement structures in improving the thermal control performance of PCM systems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Vidyadhar Karlapalem, Sukanta Kumar Dash
Summary: The thermal performance of a multi-branching fin and a fin with only two branches under laminar natural convection conditions was numerically investigated. It was found that multi-branching fins perform slightly better than fins with only two branches when gravity acts along the length of the fins. However, when gravity acts along the thickness of the fin-stem, asymmetric arrangement of branches results in a 14.7% enhancement in heat dissipation relative to optimal symmetric arrangement.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Mustafa Z. Mahmoud, Hayder I. Mohammed, Jasim M. Mahdi, Dmitry Olegovich Bokov, Nidhal Ben Khedher, Naif Khalaf Alshammari, Pouyan Talebizadehsardari, Wahiba Yaici
Summary: This study presents a numerical optimization of PCM heat exchangers with circular fins of different orientations and distributions to enhance melting and heating rates. Results show that adopting downward-upward fin orientations, longer but thinner fins, and appropriate combinations of Reynolds numbers and inlet temperatures can significantly increase the potential for enhancing PCM melting.
Article
Thermodynamics
Thavamalar Kumaravelu, Syamimi Saadon, Abd Rahim Abu Talib
Summary: The Stirling engine has high theoretical efficiency and multi-fuel adaptability, but its performance is penalized when integrated with a low heat source. This paper focuses on enhancing engine performance through heat transfer, investigating the effects of different types of fins on efficiency through numerical analysis. The addition of rectangular fins led to the highest efficiency of 19.03% with improvements in heat transfer rate, efficiency, and power output.
Article
Energy & Fuels
Sunnykumar Patel, Syeda Humaira Tasnim, Shohel Mahmud
Summary: This study presents a novel approach of charging PCM inside toroidal tubes in LHTES system. Numerical investigations reveal that fin orientation plays a dominant role in enhancing heat transfer. In the toroidal tube LHTES system, correctly oriented fins provide higher rate of energy storage and save melting time.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Green & Sustainable Science & Technology
Heng Zhang, Shuli Liu, Ashish Shukla, Yuliang Zou, Xiaojing Han, Yongliang Shen, Liu Yang, Pengwei Zhang, Kanzumba Kusakana
Summary: This paper investigates the use of copper mesh for enhancing the thermal performance of thermochemical reactors, showing that the copper mesh method has better thermal performance, including higher temperature rise and lower pressure drop.
Article
Thermodynamics
Xiaojing Han, Cheng Zeng, Shuli Liu, Zhihao Wang, Shihan Deng, Heng Zhang
Summary: This study presents a triangular honeycomb reactor using zeolite 13X-H2O working pair and investigates its heat and mass transfer performance. A three-dimensional transient heat and mass transfer model has been built and experimentally validated to demonstrate the accuracy of the model. The results show that the reactor has high thermal efficiency and controllable charging and discharging performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Yongliang Shen, Shuli Liu, Abdur Rehman Mazhar, Jihong Wang, Yongliang Li
Summary: This study proposes a new solution to improve the performance of cascaded latent heat storage (CLHS) systems by embedding porous media with tuned porosity arrangement. The solution enhances the synchronization of the phase transformation process of phase change materials (PCMs) and improves the heat storage rate. The tuned porosity arrangement reduces overcharging time and increases the total heat storage rate, and it also prolongs heat supply time and increases the accumulated discharged heat.
ENERGY AND BUILDINGS
(2023)
Article
Thermodynamics
Yongliang Shen, Abdur Rehman Mazhar, Pengwei Zhang, Shuli Liu
Summary: The structure optimization of tree-shaped fins is important for enhancing heat transfer performance in latent heat storage systems. Through the coupling of a genetic algorithm and CFD simulation, the structure of the tree-shaped fins was optimized, leading to reduced phase transition time and increased heat transfer rate and coefficient. This study provides a method for structural optimization and expands the application prospects of tree-shaped fins in the field of latent heat storage.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Wenjie Ji, Heng Zhang, Shuli Liu, Yongliang Li, Zhihao Wang, Shihan Deng
Summary: In this paper, a metal mesh net-packed method is proposed to improve the performance of thermochemical energy storage. The cube-shaped aluminium mesh net-packed method is proven to be the optimal method, providing references for further research.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Aurang Zaib, Abdur Rehman Mazhar, Shahid Aziz, Tariq Talha, Dong-Won Jung
Summary: This paper investigates the heat transfer enhancement techniques for phase change materials (PCM) in duplex and triplex tube heat exchangers. Numerical analysis is conducted to evaluate the effect of external fins and internal-external fins on the melting and solidification process. The results show that the novel configurations significantly reduce the total time of phase change without disrupting the convectional currents.
Article
Energy & Fuels
Yihan Wang, Zicheng Zhang, Shuli Liu, Zhihao Wang, Yongliang Shen
Summary: New composite adsorbents have been developed to enhance the application of thermochemical energy storage technology in buildings. By impregnating volcanic rock in saturated MgCl2 and CaCl2 solutions, the composite adsorbents, called composite-MgCl2 and composite-CaCl2, showed increased water uptake and thermochemical energy storage densities compared to zeolite-MgCl2. The composites maintained high energy storage capacity and low energy storage density cost after multiple cycles.
Article
Construction & Building Technology
Aurang Zaib, Abdur Rehman Mazhar, Tariq Talha, Muhammad Inshal
Summary: This study investigates a phase change material-based heat exchanger for indoor temperature stabilization in continental climate zones typical of Southeast Asia. Experimental tests on eight different cases reveal that the configuration using forced convection during both charging and discharging provides the best thermal performance. This solar-powered PCM-HX, which is capable of maintaining temperature differences and reducing energy consumption, has the potential to minimize domestic heating loads and greenhouse gas emissions compared to conventional heating technologies currently used in Southeast Asia.
ENERGY AND BUILDINGS
(2023)
Review
Chemistry, Physical
Shahid Aziz, Tariq Talha, Abdur Rehman Mazhar, Junaid Ali, Dong-Won Jung
Summary: Buildings consume a significant amount of energy globally, and researchers are striving for energy conservation within buildings. Solar systems incorporating phase change materials (PCMs) for thermal storage have great potential. Existing research shows that PCMs can be configured using either passive or active techniques when coupled with solar thermal energy, with active heat exchangers being more efficient and cost-effective. For most domestic buildings, organic PCMs with phase change temperatures around 42°C and thermal conductivities up to 0.56 W/m.K are most suitable. Hybrid systems and annual savings per year are key factors to consider. This review provides valuable insights for designers and researchers in coupling PCMs with solar thermal energy in non-industrial buildings. Rating: 8/10.
Article
Thermodynamics
Tingsen Chen, Shuli Liu, Yongliang Shen, Binxu Gao, Abdur Rehman Mazhar
Summary: A novel triangular pulsating heat pipe (TPHP) is proposed to solve the starting-up issue in a non-vertical direction. The study investigates the impact of TPHP model structure, heating temperature, and liquid filling ratio on heat transfer performance. The results reveal that a rationalized model structure reduces heat flow resistance by up to 38.04%, and the optimum liquid filling ratio is around 50%. This study is critical for expanding the application of single-loop PHP in buildings.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Review
Engineering, Manufacturing
Rabiah Tabassum, Uzair Khaleeq Uz Zaman, Aamer Ahmed Baqai, Abdur Rehman Mazhar, Sajid Ullah Butt
Summary: This paper provides a systematic literature review of process planning in hybrid additive manufacturing (HAM) and identifies a research gap in this field. It also discusses the challenges and opportunities in process planning of HAM, providing direction for future research.
JOURNAL OF ADVANCED MANUFACTURING SYSTEMS
(2023)
Article
Thermodynamics
Yongliang Shen, Shuli Liu, Haibo Jin, Abdur Rehman Mazhar, Shaoliang Zhang, Tingsen Chen, Yihan Wang
Summary: This study applies porous media composite phase change materials (CPCMs) to cascaded latent heat storage (CLHS) system to improve heat transfer rate, and compares the influences of porosity and heat transfer fluid (HTF) inlet boundary conditions on the system performance. It is found that porosity is the key factor affecting charging and discharging rates, but its impact on energy and exergy charge/discharge rates is not monotonic. The effect of HTF inlet temperature and velocity on the system is complex.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Yunxia Ma, Fei Liu, Honggang Pan, Hongjian Zhang, Shuxia Yan, Ailing Zhang
Summary: This paper proposes a dynamically tunable and switchable perfect infrared absorber that exhibits excellent electrical regulation performance and high absorptance. The absorption mechanism is explained using a multiple interference model, and it is proven to be polarization insensitive.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
F. J. dos Santos, G. S. M. Martins, M. Strobel, L. Beckedorff, K. V. de Paiva, J. L. G. Oliveira
Summary: This study investigates the effects of inlet conditions and plate's features on the thermal-flow performance of a gasket plate heat exchanger (GPHE) and assesses the impact of a modified tightening distance on its performance. No systematic study on the combined effects of inlet conditions and assembly accuracy on GPHE performance has been conducted before.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Alok K. Ray, Dibakar Rakshit, K. Ravi Kumar, Hal Gurgenci
Summary: The low thermal conductivity of phase change materials limits the heat transfer rate and application of latent heat storage systems. This numerical study examines the impact of two passive heat transfer enhancement techniques on the thermal performance of a latent heat storage system. The results show that the orientation and position of the heat transfer fluid tube have significant effects on the charging duration, while the discharging duration remains unchanged. The combined effect of orientation and eccentricity reduces the charging duration, but increases the discharging duration compared to the concentric domain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yalu Han, Yanlong Wang, Chenyang Liu, Xinmin Hu, Yin An, Zhengcai Li, Jiaxun Jiang, Lizhi Du
Summary: This paper investigates the calculation method of thermal conductivity in NAPLs-contaminated soils. By establishing NAPLs-contaminated soil models and using the Lattice Boltzmann Method (LBM) for calculation, an optimized three-dimensional model with high computational accuracy and efficiency is obtained. The study also finds that saturation and Nz parameters have a significant impact on calculation time, while the thermal conductivity of the two-dimensional model is more sensitive to anisotropy. The influence of porosity and NAPLs content on thermal conductivity should be considered during in-situ thermal desorption.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Mostafa Taha, Song Zhao, Aymeric Lamorlette, Jean-Louis Consalvi, Pierre Boivin
Summary: For the first time, large-eddy simulations (LES) of the near-field region of large-scale fire plumes were performed using a pressure-based Lattice Boltzmann method (LBM) with low-Mach number approximation. The simulations showed quantitative agreement with experimental data and were consistent with previously-published numerical studies. The study demonstrated the computational efficiency of the proposed LBM solver in tackling fire-induced flows, suggesting LBMs as a good alternative candidate for modeling fire-related problems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(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
Thermodynamics
Rui Zhang, Zhen-lei Li, Yan-sheng Zhang, Dong Chen, Guo Yuan
Summary: This study discusses the heat transfer behavior of different jet forms on steel tubes. The results show that the annular jet performs better in terms of cooling intensity and uniformity. The cooling performances of the two jet forms are similar when the steel tube size is small. Therefore, the planar jet can be considered for smaller diameters due to its simplicity, low cost, and convenience in application.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
A. R. Khoei, A. M. Orvati Movaffagh, A. Rezaei Sameti
Summary: This paper presents a comprehensive study on the thermo-mechanical characteristics of oxide-coated aluminum nano-powder. It is found that the thermal conductivity of oxide-coated aluminum nano-powder is significantly lower than that of the bulk aluminum, and it is affected by the density and temperature.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yanjin Wang, Jintao Xiong, Lingyu Chen, Zhihai Lv, Qian Wang
Summary: A solar radiation transfer model for spray cooling double skin facade (SC-DSF) is proposed in this study. The model is validated by experimental results and various influence factors are analyzed. The effectiveness of adjusting droplet coverage rate and size is also evaluated.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Bostjan Zajec, Blaz Mikuz, Anil Kumar Basavaraj, Marko Matkovic, Matej Tekavcic, Martin Draksler, Leon Cizelj, Bostjan Koncar
Summary: We have developed an advanced experimental setup to investigate flow and heat transfer in an annular channel. The setup allows heat transfer measurements and flow visualization using a temperature-controlled inner tube. Measurements can be conducted in both single-phase and two-phase flow regimes. The setup ensures a uniform velocity field in the annular channel using specially designed inlet and outlet headers. The inner copper tube is heated by water and contains turbulators for enhanced heat transfer and thermocouples for temperature measurement. A three-dimensional conjugate heat transfer CFD model has been developed and validated to accurately estimate heat losses in the setup. This study demonstrates the importance of numerical simulations in improving the interpretation of complex experimental results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weijie Chen, Ke Wang, Yongqing Wang, Shantung Tu, Zunchao Liu, Huijuan Su
Summary: In this study, a novel gradient porosity transpiration cooling plate structure (GP-TCPS) is proposed to alleviate heat transfer deterioration caused by non-uniform temperature distribution in transpiration cooling plate structure (TCPS). Computational fluid dynamics (CFD) and response surface method (RSM) were used for qualitative and quantitative analysis of the flow and heat transfer of GP-TCPS. The optimized structure of GP-TCPS significantly improves temperature uniformity, injection pressure, and average cooling efficiency compared to traditional TCPS.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
R. Essam, A. Elsaid, W. K. Zahra
Summary: This study presents a novel bioheat model for simulating heat transfer in skin tissue. The model offers an improved representation of thermal dynamics in the skin and has been validated using numerical solutions and experimental measurements. The study highlights the importance of incorporating vascular inlet parameters and thermal relaxation effects in the thermal profile, and suggests potential applications in thermal therapy and wound healing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Dongbo Shi, Tao Xu, Zifeng Chen, Di Zhang, Yonghui Xie
Summary: The cooling structure design of turbine blades is crucial for the safety and reliability of the gas turbine set. This research investigates different arrangement schemes, including dimple/protrusion arrangements, to enhance the cooling performance. The results show that the arrangement scheme with both passes arranged by dimples has the best comprehensive thermal performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Emrehan Guersoy, Hayati Kadir Pazarlioglu, Mehmet Guerdal, Engin Gedik, Kamil Arslan
Summary: The thermo-hydraulic performance of Al2O3/H2O nanofluid with different nanoparticle shapes flowing in a sudden expansion tube with variable sudden expansion inclination angles and elliptical dimpled fins with different diameters were numerically investigated. The results showed that the nanoparticle shapes, sudden expansion inclination angles, and elliptical dimpled fin have significant impact on the thermo-hydraulic performance. This study reveals the novelty and importance of these factors in the research.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(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)