Article
Thermodynamics
Yue Ma, Huang Zhang, Qianfeng Liu
Summary: This study experimentally investigates the spreading and splashing behavior of continuous droplets impinging on a heated wall under different conditions. The spreading parameters of the droplets and the relationship between splashing parameters, droplet Weber numbers, and Jacob numbers are analyzed and mathematically fitted.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Baris Burak Kanbur, Marcus Zhao Hui Lee, Fei Duan
Summary: This study investigates the transition of high-speed and high-frequency ethanol droplet train impingement on the glass substrate, analyzing the changes in surface temperature along 50 milliseconds. The spreading diameter trends depend on the thermal balance between the supplied liquid ethanol and the ethanol consumption from the glass surface, with the diameter increasing with increments in the Weber number while decreasing with the rise of the glass surface temperature. The observation of boiling, transition, and post-transition regimes provides insight into the process of droplet impact on the glass surface.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Tej Pratap Singh, Anupam Dewan
Summary: The present computational study aims to investigate and improve the turbulent dual jet cooling performance on an undulated surface with varying profiles. The outcomes of the study can be implemented for better design in automobile industries and utilization of cooling or heating jets in electronics, metal, and material processing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Zhe Yan, Haoxiang Huang, Wentao Pan, Bili Deng, Zhenhai Pan
Summary: This study utilized numerical simulations to investigate evaporation bubble behaviors and heat transfer characteristics within heated microchannel T-junctions, revealing significant impacts of bubble behaviors, wall superheat, and channel width ratio on breakup regimes and heat transfer performance. It was found that small bubble oscillation enhances local heat transfer, while the occurrence of tunnel weakens heat transfer enhancement. Additionally, the serpentine flow structure at larger channel width ratio significantly influences branching channel heat transfer. Overall, heat transfer performance tends to improve with increasing wall superheat or decreasing channel width ratio.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Ankush Kumar Jaiswal, Sameer Khandekar
Summary: Spray cooling is an effective method for cooling high heat flux dissipating surfaces. This study investigates the impact of two consecutive droplets on a heated substrate. It is found that the peak heat flux during the impact of the second droplet is significantly lower than that of the first droplet. The study also examines the influence of the We number of the second droplet and the initial substrate temperature on heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Mahsa Ebrahim, Buddha Elkenani, Alfonso Ortega
Summary: This paper investigates the problem of single droplet impingement on a heated surface and explores the effects of transient surface temperature changes on the hydrodynamic and heat transfer mechanisms during droplet impact. Experimental results show that heat removal is more effective at lower impact velocities, and the maximum temperature drop occurs at the position of maximum spreading diameter. An analytical model is also developed to successfully predict the transient Nusslet number of droplet motion on the surface.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Enhui Chen, Feng Xu
Summary: Transient thermocapillary convection flows driven by heated lateral walls in a rectangular cavity under zero-gravity conditions were investigated using scaling analysis and numerical simulation. Various flow regimes were identified based on Marangoni and Prandtl numbers, with corresponding scaling laws for thickness and velocity obtained. Two-dimensional numerical simulations confirmed good agreement with the scaling predictions.
Article
Thermodynamics
Alexandra Semyonova, Nikita Khomutov, Sergey Misyura, Maxim Piskunov
Summary: This paper presents experimental results on the spreading, fingering, and corona-like splashing of water-in-oil emulsion droplets in collision with a solid surface. The effects of Weber numbers, wall temperatures, and the assumptions explaining the behavior of the maximum spreading diameter of emulsion droplets are examined. The results provide insights into predicting the behavior of the corona based on the relationship between the viscous dissipation of the spreading liquid and the energy transferred to the liquid from the wall.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Hua Chen, Xiao-hui Ruan, Yu-hang Peng, Yan-ling Wang, Xue-hong Wu, Chuan-xiao Cheng
Summary: This paper investigates the heat transfer and temperature variation of droplet impact on a heated wall in the non-boiling regime using analytical solutions. The study shows that thermal effusivity is the decisive property in predicting heat transfer, and materials with higher thermal effusivity exhibit better heat transfer capacity. The findings emphasize the importance of thermal effusivity in future thermal management.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Multidisciplinary Sciences
Jing Wang, Jing Ma, Houbing Huang, Ji Ma, Hasnain Mehdi Jafri, Yuanyuan Fan, Huayu Yang, Yue Wang, Mingfeng Chen, Di Liu, Jinxing Zhang, Yuan-Hua Lin, Long-Qing Chen, Di Yi, Ce-Wen Nan
Summary: The authors propose programmable logic gates and circuits based on electric-field controllable conductive domain walls, demonstrating stable and repeatable on-and-off switching of conductive domain walls through reversible transformations. This research shows potential applications in logic processing.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
J. P. Muthusamy, Taolue Zhang, Jorge L. Alvarado, Anoop Kanjirakat, Reza Sadr
Summary: The study investigated the heat transfer and hydrodynamic characteristics of droplet-induced spreading-splashing transition through experimental and numerical methods. It was found that droplet Weber number plays a significant role in the transition and droplet-induced liquid film heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Milad Shakeri Bonab, Roger Kempers, Alidad Amirfazli
Summary: This study investigated the influence of airflow on the condensation heat transfer coefficient of humid air on a horizontal surface. The results showed that the heat transfer coefficient was lowest for a subcooling temperature of 0 degrees C, and higher relative humidity resulted in higher heat transfer coefficients.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Ankush Kumar Jaiswal, Sameer Khandekar
Summary: This study investigates the heat transfer during the impact of two liquid droplets and finds that the impact velocity and droplet size have an effect on heat transfer. By comparing it with the impact of a single droplet, an appropriate velocity scale range is determined to accurately predict the heat transfer during droplet impact.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2023)
Article
Energy & Fuels
Liu Wang, Yue Ding, Yinan Qiu, Yunxing Yu, Junlong Xie, Jianye Chen
Summary: This study investigates the heat transfer mechanisms of liquid nitrogen droplets on a micro-structured surface. The results show that smaller fin sizes inhibit the droplets from entering the grooves between the fins, resulting in a thinner liquid film.
Article
Mechanics
Md Ashraful Islam, Albert Y. Tong
Summary: This study numerically analyzed the dynamics of drop formation from a vertical capillary tube, identifying the mechanism of satellite drop formation and liquid filament recoiling after droplet detachment. Parametric studies showed that inlet velocity, surface tension coefficient, and viscosity play important roles in satellite droplet generation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Environmental Sciences
Christos Tsitsis, Dimitrios E. E. Alexakis, Konstantinos Moustris, Dimitra E. E. Gamvroula
Summary: The research aimed to evaluate the surface water system of Lake Vegoritida in Greece using the DPSIR methodological approach. Data analysis from 1983 to 1997 showed an increase in nutrient concentration contributing to eutrophic conditions. Artificial neural network (ANN) was used for predictions based on water quality data. The findings emphasized the need for sustainable land management, reduction in point sources of pollution, and agrochemicals in the study area to improve the water quality status and overall ecological assessment.
Article
Environmental Sciences
Dimitrios Nikolopoulos, Aftab Alam, Ermioni Petraki, Panayiotis Yannakopoulos, Konstantinos Moustris
Summary: This paper explores the multifractal characteristics of PM10 time series in the Greater Athens Area, Greece. The study utilizes a novel method called multifractal detrended fluctuation analysis (MFDFA) to analyze raw and shuffled series in 74 segments. The results show multifractality in all segments, with generalized and classical Hurst exponents falling within specific ranges. A new parameter, FWHM / f(max), is used to identify important multifractal behavior. The findings provide strong evidence of the multifractality of the PM10 time series.
Article
Energy & Fuels
Vasilis Apostolopoulos, Ioannis Mamounakis, Andreas Seitaridis, Nikolas Tagkoulis, Dimitrios-Sotirios Kourkoumpas, Petros Iliadis, Komninos Angelakoglou, Nikolaos Nikolopoulos
Summary: Building stock retrofitting is crucial for achieving sustainable goals in the building sector. This paper introduces a developed online tool called VERIFY, which performs dynamic life cycle analysis and global warming impact assessments for building renovation. The tool analyzes temporal profiles of energy consumption and temperature changes, and can exchange data with other energy simulation engines. The paper also evaluates the impact of energy retrofitting measures for a residential building in Athens, Greece, resulting in significant reductions in primary energy needs and CO2eq emissions.
Article
Energy & Fuels
Konstantinos Moustris, Dimitrios Zafirakis
Summary: Grid operators of islands with limited system tolerance often face the challenge of curtailing wind energy to maintain system stability and security of supply. Wind park owners, on the other hand, struggle with rejected wind energy production due to lack of storage facilities and flexibility options. This study focuses on predicting day-ahead wind energy production in island grids using artificial neural networks, aiming to provide accurate forecasts for wind park owners and explore alternative actor schemes in similar systems.
Article
Energy & Fuels
Renos Rotas, Maria Fotopoulou, Panagiotis Drosatos, Dimitrios Rakopoulos, Nikos Nikolopoulos
Summary: This study assesses the annual performance improvement of two actual building spaces retrofitted with Adaptive Dynamic Building Envelopes (ADBEs) and evaluates their potential to contribute to the electricity and heating load of the spaces. The results demonstrate that the ADBE system can significantly benefit the energy consumption of the buildings in Cardiff and Grevena.
Article
Environmental Sciences
Kleopatra Ntourou, Konstantinos Moustris, Georgios Spyropoulos, Kyriaki-Maria Fameli, Nikolaos Manousakis
Summary: This paper aims to provide quantitative and qualitative data on the impact of long-term air pollution on the health of residents in the Greater Athens Area. The AirQ+ model is used to estimate the prevalence of bronchitis in children and the incidence of chronic bronchitis in adults due to particulate matter exposure. The results show a significant correlation between PM10 concentrations and adverse health effects, with a higher prevalence of bronchitis in children compared to adults. The unhealthiest areas were found to be the center of Athens city and suburban areas. There was a decreasing trend in both PM10 concentrations and the prevalence of chronic bronchitis over the 20-year period, particularly from 2010 to 2020.
Review
Computer Science, Information Systems
David Cervero, Maria Fotopoulou, Jesus Munoz-Cruzado, Dimitrios Rakopoulos, Fotis Stergiopoulos, Nikos Nikolopoulos, Spyros Voutetakis, Jose Francisco Sanz
Summary: The paper provides a practical review of the solid state transformer (SST), which is considered to be the dominant solution for the changing architecture of electricity networks. It presents the main functionalities and possible applications of SST, including smart grids, data centres, railways, and offshore wind farms. The analysis of SST prototypes and future trends and challenges in wider implementation of SST technology in the electrical grid are also discussed.
Article
Energy & Fuels
Charalampos Papadopoulos, Athanasios Bachoumis, Niki Skopetou, Costas Mylonas, Nikolaos Tagkoulis, Petros Iliadis, Ioannis Mamounakis, Nikolaos Nikolopoulos
Summary: This paper presents an integrated methodology for decision making in smart grid investments, assessing the investment plans of stakeholders in local energy communities. The methodology utilizes specialized tools and evaluates different smart grid investment scenarios from a multi-dimensional perspective, highlighting the most sustainable and profitable solution.
Article
Energy & Fuels
Christos Papalexis, Dionisis Stefanitsis, Myrto Zeneli, Nikolaos Nikolopoulos, Panteleimon Tzouganakis
Summary: This paper presents a proof of concept for a novel parallel-flow solid-solid heat exchanger, called Double L-Valve, consisting of two L-Valves with concentric vertical tubes. The heat exchanger is designed for the Carbonate Looping process as a CO2 capture technology. The study includes experimental analysis on a small scale and proposes a scaled-up hydrodynamic model for industrial application.
Article
Energy & Fuels
Panagiotis Drosatos, Grigorios Itskos, Nikolaos Nikolopoulos
Summary: This study focuses on optimizing the design of an electric heater for pre-heating molten salt in a supercritical CO2-molten-salt loop. Computational fluid dynamics simulations are used to identify potential issues and propose modifications to eliminate hot spots and thermal stratification. The results show that a homogeneous distribution of heat flux density and turbulent flow can prevent the development of hot spots and thermal stratification. This study contributes to the optimization of molten-salt electric heater operation and the development of next-generation molten-salt-supercritical-CO2 concentrating solar power plants.
Article
Energy & Fuels
Georgios Kanellis, Myrto Zeneli, Nikolaos Nikolopoulos, Carina Hofmann, Jochen Stroehle, Sotirios Karellas, Jukka Konttinen
Summary: This study focuses on the transient three-dimensional CFD simulation of the novel bubbling-bed calciner for calcium looping pilot plant. The study accurately models the granular flow using the state-of-the-art Eulerian-Eulerian approach and considers the drag coefficient and calcination kinetics. The study also takes into account the heat transfer mechanisms from the heat pipes to the bubbling bed, verifying the simulation results against experimental data. The study provides insights into the effect of hydrodynamics on heat transfer and indicates that fluidization velocity has a mild impact on the total heat flux.
Article
Green & Sustainable Science & Technology
Angeliki Kitsopoulou, Antonis Zacharis, Nikolaos Ziozas, Evangelos Bellos, Petros Iliadis, Ioannis Lampropoulos, Eleni Chatzigeorgiou, Komninos Angelakoglou, Nikolaos Nikolopoulos
Summary: This paper investigates different heating configurations utilizing renewable thermal sources in conjunction with a heat pump-based system, aiming to determine the optimal configuration in terms of efficiency. Through dynamic energy simulations, it is demonstrated that renewable thermally driven heat pumps are more efficient than conventional air-source ones. The most effective and economical design is found to be the dual-source system, while the ground-source configuration is the most expensive.
Article
Construction & Building Technology
Komninos Angelakoglou, Eleni Chatzigeorgiou, Ioannis Lampropoulos, Paraskevi Giourka, Georgios Martinopoulos, Nikolaos Nikolopoulos
Summary: This study proposes a four-step methodology to identify suitable key performance indicators (KPIs) for assessing the sustainability performance of buildings transitioning into zero-carbon, resource-efficient, and resilient structures. The methodology involves developing a KPI repository, expanding it with literature information, refining it based on predefined criteria and stakeholder feedback, and developing KPI cards for coordination of data gathering. The implementation of this methodology resulted in a final repository of 31 KPIs.
Article
Chemistry, Physical
Christos Papalexis, Dimitrios Rakopoulos, Nikolaos Nikolopoulos, Alessandro Della Rocca, Guido Jochler, Oriana Tassa, Christos Kalligeros, Panteleimon Tzouganakis, Vasilios Spitas
Summary: This work focuses on developing creep and stress relaxation models for Inconel 625 and Stainless Steel 310 materials used in additive manufacturing. The study evaluates the operational lifespan of an industrial-scale additively manufactured recuperator. Tensile testing, FEA modeling, and analytical models are employed to determine material parameters, predict creep response, and assess the service life. The results show that Inconel 625 has higher resistance to creep and lower thermal stresses, resulting in a significantly longer service life compared to Stainless Steel 310.
Article
Engineering, Chemical
P. Stamatopoulos, D. Stefanitsis, M. Zeneli, N. Nikolopoulos
Summary: This study presents an Artificial Neural Network EMMS (ANN-EMMS) drag scheme specifically developed for fluidized bed reactors in chemical looping combustion. The ANN-EMMS, along with three other drag models, is tested in CFD simulations for a pilot scale FB air reactor. The results show that the ANN-EMMS provides the closest fit to experimental data for pressure profiles in the reactor and accurately predicts ilmenite conversion rates.
CHEMICAL ENGINEERING SCIENCE
(2023)
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)
