Article
Thermodynamics
Anwer B. Al-Aasam, Adnan Ibrahim, Kamaruzzaman Sopian, M. Bassam Abdulsahib, Mojtaba Dayer
Summary: The thermal performance of a photovoltaic thermal (PVT) collector with a twisted absorber tube and nanoparticle-enhanced phase change material (Nano-PCM) was evaluated. The photovoltaic, thermal, and combined photovoltaic thermal efficiencies were assessed using an indoor solar simulator. Circular and twisted absorber tubes with Nano-PCM were tested in two designs. Water with different volume fractions of SiC nanofluids was used as the working fluid. The highest efficiencies were achieved by the PVT-PCM with twisted tube and 0.6% nanofluids, with photovoltaic, thermal, and combined photovoltaic thermal efficiencies of 9.57, 84.74, and 94.31, respectively.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Review
Thermodynamics
Abdulhammed K. Hamzat, Mayowa I. Omisanya, Ahmet Z. Sahin, Oluremilekun Ropo Oyetunji, Nafiu Abolade Olaitan
Summary: This review highlights the recent advancements in nanofluid-based solar energy harvesting devices and discusses the manipulation of various parameters to efficiently harness solar energy. Nanofluid outperforms conventional fluid in terms of collector performance, especially in solar-powered desalination systems. The review provides valuable insights for young researchers, funding agencies, investors, government, and journal outlets, aiming to promote the commercialization of nanofluid as a working fluid in solar collectors.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Ismail Ozcan, Ahmet Ozsoy, Arif Emre Ozgur, Mustafa Karaboyaci
Summary: This study investigates the thermal efficiency and pressure drop of a solar collector with serial connected U-pipe evacuated tubes, using nanofluid of different concentration ratios. It was found that the efficiency increased by 14.3% to 22.1% compared to water when using a 2% concentration nanofluid with decreasing reduced temperature. The highest collector efficiency was approximately 80% with a 2% TiO2 concentrated nanofluid.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mahdi Deymi-Dashtebayaz, Mojtaba Rezapour
Summary: Concentrator photovoltaic thermal system with Al2O3 nanofluid flow in porous channel under transient heat flux was analyzed in this study using finite element method. The numerical results showed good agreement with experimental data, with efficiency of the photovoltaic cell and first law efficiency increasing with Reynolds number, while second law efficiency decreasing.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Chemical
Muhammad Ibrahim, Tareq Saeed
Summary: This article investigates the cooling of photovoltaic cells using a newly designed heatsink, finding that using nanofluids can increase heat transfer coefficient but also require more pumping power. Addition of alumina nanoparticles can improve thermal efficiency, while addition of copper oxide nanoparticles can reduce it.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Green & Sustainable Science & Technology
T. Zhang, Y. F. Zhang, Z. R. Shi, Q. F. Li, J. Y. Cai
Summary: A hybrid PV/T collector/evaporator was designed and a hybrid system named PV-SAHP/GHP was proposed. Outdoor experiments were conducted to compare the operating characteristics of different modes. The results showed that the GHP-PV/T mode had satisfactory energy-saving effect while the PV-SAHP mode met the temperature demand but had unsatisfactory energy conservation effect. It is recommended to operate the GHP-PV/T mode during intense radiation and the PV-SAHP mode otherwise to balance the thermal performance and energy-saving benefits.
Article
Green & Sustainable Science & Technology
Ahmed N. Abdalla, Amin Shahsavar
Summary: The usability of water based GO-TiO2-Fe3O4 ternary nanofluid in a photovoltaic/thermal (PV/T) collector was examined in this experimental study from both energy and exergy perspectives. The effects of nanoadditive mixing ratio, nanofluid mass flow rate, and nanoparticle volume concentration on the outcomes were investigated. The results showed that the nanofluid with a mixing ratio of 1:1:1 had the best performance in terms of energy and exergy. Among the cases examined, the highest overall energy and exergy efficiencies were 88.23% and 15.36%, respectively, for the 1:1:1 mixing ratio, 80 kg h-1 mass flow rate, and 1% volume concentration. Finally, it was found that both the mass flow rate and volume concentration had an increasing effect on the overall energy and exergy efficiencies.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Amin Shahsavar
Summary: The survey comprehensively examines a photovoltaic-thermal system with a sinusoidal serpentine tube collector, comparing it with other systems and showing that the combination of a sinusoidal serpentine tube with a nanofluid can enhance the energetic and exergetic performances of the system, with performance optimization achieved by adjusting key parameters.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Multidisciplinary
C. J. Ho, Chu-Yun Cheng, Tien-Fu Yang, Saman Rashidi, Wei-Mon Yan
Summary: This study explores the cooling effectiveness and entropy production of aluminum oxide-water nanofluid in circular tubes with wall conduction effects. Results show that heat transfer effectiveness ratios increase with higher input temperatures of fluid and nanoparticle concentrations. Additionally, local entropy production ratios are mostly below unity, indicating the beneficial use of nanofluids for reducing system irreversibility.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Abdulsahib M. Bassam, Kamaruzzaman Sopian, Adnan Ibrahim, Mohd Faizal Fauzan, Anwer B. Al-Aasam, Ghaith Yahay Abusaibaa
Summary: The efficiency of a photovoltaic cell decreases as temperature rises. A hybrid PVT system using a cooling nanofluid circulation system with a micro fin tube encapsulated with nano PCM was studied to increase efficiency.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Abdullah A. A. A. Al-Rashed, Abdulwahab A. Alnaqi, Jalal Alsarraf
Summary: This study investigates the effect of twisting the inner tube and using DWCNT-Cu/water hybrid nanofluid on the hydrodynamic performance and exergy efficiency of a heat exchanger under the climatic conditions of Kuwait. The results show that heat transfer and pressure drop are enhanced with increasing Reynolds number and volume fraction of nanoparticles. Furthermore, increasing the pitch ratio of the internal spiral tube leads to improved heat transfer and pressure drop effects.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Chemical
Mohammad Shafiey Dehaj, Mohsen Rezaeian, Davoud Mousavi, Sajjad Shamsi, Masoud Salarmofrad
Summary: The study investigated the efficiency of the parabolic trough solar collector using Nickel Ferrite nanofluid as a working fluid, with results showing that higher flow rates of the nanofluid were more effective than pure water. Additionally, the use of U-tube as an absorbent proved to be more effective than without.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Green & Sustainable Science & Technology
Sumit Kumar, Arun Kumar Tiwari
Summary: This study demonstrated the impact of hexagonal Boron Nitride nanofluid on the thermal performance of a solar collector. The results showed that the nanofluid with a volumetric concentration of 1.5% achieved the highest energy efficiency at a mass flow rate of 0.051 kg/s, which was approximately 84% higher than water.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Green & Sustainable Science & Technology
Amin Shahsavar, Prabhakar Jha, Muslum Arici, Patrice Estelle
Summary: This experimental study compares the energetic and exergetic performance of a base PVT system with sheet-and-plain serpentine tube collector with two modified PVT systems. It is found that the 6-start rifled PVT system achieved the highest overall energy and exergy efficiency at a flow rate and concentration of 80 kg/h and 2%. The electrical power generated by the different PVT systems also showed significant enhancements compared to the PV module without cooling.
Article
Energy & Fuels
Amin Shahsavar, Prabhakar Jha, Muslum Arici, Sandro Nizetic, Zhenjun Ma
Summary: In this experimental investigation, the energetic and exergetic performances of three nanofluid-based photovoltaic/thermal (PVT) systems were evaluated and compared. The results showed that the increase in nanofluid flow rate improved the overall performance of the systems, with case-III outperforming case-I and case-II under certain conditions. The findings suggest that nanofluid-based PVT systems can provide better energy efficiency and electrical performance.
Article
Engineering, Chemical
Prakash Malaiyappan, Natarajan Elumalai
DESALINATION AND WATER TREATMENT
(2016)
Article
Engineering, Chemical
Prakash Malaiyappan, Natarajan Elumalai
DESALINATION AND WATER TREATMENT
(2016)
Article
Thermodynamics
D. Anin Vincely, E. Natarajan
ENERGY CONVERSION AND MANAGEMENT
(2016)
Article
Energy & Fuels
L. Rekha, M. M. Vijayalakshmi, E. Natarajan
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2016)
Article
Materials Science, Characterization & Testing
B. Srimanickam, M. M. Vijayalakshmi, E. Natarajan
JOURNAL OF TESTING AND EVALUATION
(2018)
Correction
Thermodynamics
Senthil Kumar Ranganathan, Natarajan Elumalai, Puja Priyadharshini Natarajan
Article
Thermodynamics
Anin Vincely Dasaien, Natarajan Elumalai
Article
Engineering, Aerospace
Karthikeyan Sivakumar, N. Kulasekharan, E. Natarajan
INTERNATIONAL JOURNAL OF TURBO & JET-ENGINES
(2018)
Article
Thermodynamics
Dillibabu Venugopal, Lakshmanan Thangavelu, Natarajan Elumalai
Article
Thermodynamics
Dillibabu Venugopal, Lakshmanan Thangavelu, Natarajan Elumalai
Article
Thermodynamics
K. Arshad Ahmed, E. Natarajan
APPLIED THERMAL ENGINEERING
(2019)
Article
Thermodynamics
K. Arshad Ahmed, E. Natarajan
Article
Engineering, Mechanical
R. Senthil Kumar, P. K. Nagarajan, J. Subramani, E. Natarajan
Article
Engineering, Chemical
Deepak Kumar Murugan, Natarajan Elumalai
DESALINATION AND WATER TREATMENT
(2018)
Article
Materials Science, Characterization & Testing
Ayodya Udara Veediya Bandara Bulathsinhala, Udeni Gnanapriya Anuruddha Puswewala
Summary: Bentonite is commonly used as the drilling fluid for cast-in-situ bored pile constructions. It has been observed that the formation of bentonite filter cake significantly reduces the shaft resistance capacity of piles in sedimentary bed rocks. However, its impact on crystalline metamorphic rocks is relatively insignificant. The lack of reliable experimental data has resulted in conservative pile designs being used, but recent studies conducted in Sri Lanka suggest that unnecessary conservatism can be avoided.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Marthe Loiseau, Sylvain Chataigner, Romain Creachcadec, Emilie Lepretre, Jean-Philippe Court, Marie-Odette Quemere
Summary: Structural adhesive bonding has advantages over welding and riveting. However, creep is an important long-term phenomenon that needs to be considered. Experimental investigations at the scale of the adhesive layer are necessary. The Arcan test method was chosen for its advantages and a mechanical testing machine was developed to study the creep behavior of adhesive layers.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Dongyu Xu, Huaicheng Chen, Mei Cao, Yuli Cui, Junsheng Bai, Shoude Wang
Summary: Freezing and thawing behavior is crucial for the durability of engineering structures in cold regions. This study developed an acoustic emission (AE) sensor to evaluate the freezing-thawing characteristics of concrete. The results showed that freezing-thawing cycles increased the ring down count (RDC) and decreased the accumulative energy of the concrete.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Zhen Liu, Xingyu Gu, Qiao Dong
Summary: A method for predicting rutting in semi-rigid pavement structures was proposed using accelerated loading tests and finite element analysis. Dynamic modulus and creep tests were conducted on three pavement materials to obtain a prediction equation, which was then validated using the falling weight deflectometer test and back-calculation modulus. The results showed that rutting deformation varied under different conditions, highlighting the need for maintenance and repair of pavement structures.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Zhenpeng Yu, Qi Yang, Rui Tang, Furong Li
Summary: This study investigates the mechanical behaviors of hydraulic asphalt concrete (HAC) under combined compressive-shear stress at different temperatures and normal compressive stresses. The results show that the combination of normal compressive stress and temperature affects the peak shear stress and correlated shear strain. An increase in normal compressive stress leads to the emergence of horizontal cracks and an amplification of deformation at elevated temperatures. The peak shear stress progressively increases with an increase in normal compressive stress, but decreases with an increase in temperature. The study also establishes three modified compressive-shear failure criteria for HAC at different temperatures.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Yinshan Yu, Ding Ping, Jinsong Wei, Hui Zhang, Dongyang Zhang, Yudong Yang
Summary: This study investigates the quantitative analysis of mancozeb concentration in water quality detection using spectrophotometry. It is found that mancozeb concentration has a good linear correlation with total nitrogen and turbidity. Prediction models are established to detect the concentration of mancozeb using various parameters. The experimental results confirm the accuracy and effectiveness of the measurement method by comparing the analyzed mancozeb concentration with the actual value.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Zhengzhen Wang, Lei Huang, Guoliang Dai, Feng Li, Tianzhong Ma
Summary: The grouting effect of pile end and pile side combined post-grouting technology in cohesive soil was studied. It was found that the combined grouting significantly improved the load-bearing capacity of the piles, effectively controlled the settlement, and increased the pile end resistance and pile side friction.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Enlai Dong, Dingqiang Fan, Xianwei Ma, Peibo You
Summary: This paper summarizes the influencing factors, evaluation methods, and theoretical models of steel fiber dispersion in ultra-high-performance concrete (UHPC). It indicates that a scientifically designed mixture and adjustment of matrix rheological properties can improve fiber dispersion. In addition, flow induction and the wall effect can enhance the orientation of fibers and improve the performance of UHPC matrix.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Yan Luo, Kuibo Wang, Xiaobin Wu
Summary: This study systematically assesses the influence of internal structure on the outgassing property of alumina ceramics. The results show that denser alumina structure leads to lower outgassing rate, and the internal structure also has some influence on the outgassing characteristics of the material.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
R. Muralimohan, U. N. Kempaiah, G. B. Veeresh Kumar
Summary: This study focuses on the characteristics of hybrid metal matrix composites in terms of optical, physical, mechanical, tribological, and corrosion behavior. By reinforcing ADC12 alloy with rice husk ash and boron carbide, the researchers found that increasing the reinforcement content improves the physical and mechanical characteristics, while decreasing the elongation percentage. Moreover, the corrosion resistance of the composites also increases with higher reinforcement content, and composites with a higher percentage of reinforcement have superior wear resistance.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Zhihua Xue, Lan Wang, Chao Li, Le Zhang
Summary: This research focuses on styrene-butadiene-styrene-modified asphalt, and explores the significance of improving softening point test-related indicators through the improvement of testing methods and the combination with other tests, providing new ideas for asphalt performance evaluation.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Renhe Yang, Pengyu Zhang, Dongmei Wang, Qian Sun, Tingshu He
Summary: This study tested and evaluated the carbonation resistance of sprayed concrete mixed with different liquid accelerators and attempted to establish a prediction model for carbonation depth. The influence of different liquid accelerators on carbonation resistance was explored and the porosity, pore structure distribution, and strength properties were analyzed. The results showed that different liquid accelerators had varying effects on carbonation depth. Prediction models for carbonation depth were preliminarily established.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Zhen-Gang Feng, Xiaoran Gong, Xiangnan Li, Qi Cui, Dongdong Yao
Summary: This study investigates the effects of different polymer latex powders on high toughness concrete, and the results show that the addition of ethylene vinyl acetate and styrene butadiene can significantly improve the mechanical properties and durability of the concrete.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
A. Rajesh, A. Sumathi, D. Gowdhaman
Summary: This study explores the use of natural fibers and bacteria to improve the healing of concrete cracks. By examining the precipitation of calcium carbonate crystals produced by bacteria, the researchers find that the selected bacteria have the ability to heal cracks and improve the mechanical and durability properties of concrete. The results suggest that natural fibers can be used as sustainable carrier material for crack healing and strength improvement in concrete.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Ming-Hsiang Shih, Shih-Heng Tung, Wen-Pei Sung
Summary: This study proposes a new drilling method for stress measurement that incorporates rigid body displacement parameters to improve accuracy. Experimental results show a high degree of agreement in the identified images, indicating the reliability and accuracy of the stress measurement method.
JOURNAL OF TESTING AND EVALUATION
(2024)