Article
Thermodynamics
Ravikiran Balaga, Ramji Koona, Subrahmanyam Tunuguntla
Summary: The impact of various variables on thermal conductivity and rheological behavior, such as nanoparticle weight concentration and temperature, as well as the cumulative effects of wire coil insert and twisted tape on heat transfer coefficient and friction factor characteristics, is explored. The findings show that higher content of nanoparticles increases heat transfer as well as pressure drop.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Anil Kumar, Masood Ashraf Ali, Rajesh Maithani, Naveen Kumar Gupta, Sachin Sharma, Sunil Kumar, Lohit Sharma, Robin Thakur, Tabish Alam, Dan Dobrota, Sayed M. Eldin
Summary: This research paper presents an experimental analysis on a heat exchanger tube using a newly designed perforated conical ring combined with twisted tape as inserts. The investigation analyzes various geometric and flow parameters and establishes empirical correlations for the Nusselt number and the friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Review
Green & Sustainable Science & Technology
Younus Hamoudi Assaf, Abdulrazzak Akroot, Hasanain A. Abdul Wahhab, Wadah Talal, Mothana Bdaiwi, Mohammed Y. Nawaf
Summary: Research focuses on improving the thermal conductivity of heat exchangers by using different strategies such as inserting tapes and rings of various shapes, as well as transforming fluids into nanoliquids with nanomaterials. Factors such as torsion tape ratio, ring spacing, and flow direction impact heat transfer efficiency.
Article
Thermodynamics
Peijia Chen, Yueqing Zhang, Ying Qu, Tao Xu, Xin He, Baihui Gao, Ali Golzar, Navid Nasajpour-Esfahani, Maboud Hekmatifar
Summary: This study uses a two-phase simulation to examine the flow of nanofluid and hydraulicthermal analysis in a tube with a triple-perforated twisted tape (TT). It is found that using the TT can increase the heat transfer coefficient and pressure drop, with the permanent efficiency coefficient (PEC) values being greater than 1.10.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Prashant Kumar, R. M. Sarviya
Summary: This paper focuses on enhancing heat transfer and thermal performance factor of tubular heat exchanger by using a novel Perforated Rectangular Cut Twisted Tape (PRCTT) and compares it with other types of twisted tapes. The analysis includes different aspects such as Nusselt number, friction factor, and perforation ratio. The results show significant enhancements in Nusselt number and thermal performance when using the PRCTT, especially in the turbulent zone. The perforation of the tape further decreases the friction factor and improves the overall thermal performance factor.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Thermodynamics
H. Harish, K. Manjunath
Summary: This research compares the flow and heat transfer properties of water with circular protruded twisted-tape inserts to those with traditional twisted tapes. The study found that circular protruded twisted-tape inserts provide higher thermal enhancement and lower friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Kim Leong Liaw, Jundika C. Kurnia, Agus P. Sasmito
Summary: This study investigated the effect of inserting twisted tape into a helical tube on turbulent heat transfer, finding that the insertion of twisted tape increases the intensity of secondary flow in the radial direction, resulting in higher heat transfer performance. The results also showed that for all cases, higher inlet Reynolds numbers lead to a proportional increase in heat transfer, while the friction coefficient decreases with decreasing decrement amounts.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Multidisciplinary
Yongfeng Ju, Tiezhu Zhu, Ramin Mashayekhi, Hayder Mohammed, Afrasyab Khan, Pouyan Talebizadehsardari, Wahiba Yaici
Summary: Increasing the number of semi-twisted tapes in a heat exchanger pipe leads to enhancement in heat transfer and friction factor, which is significant for heat exchange using nanofluids.
Article
Engineering, Mechanical
Chen Sun, Wei Wang, Xi-Wei Tian, Xu Zeng, Si-Hao Qian, Yan-Zhao Cai, Xiao-Hui Wang
Summary: This study proposes a parametric modeling method for perforated twisted tapes (PTTs) combined with multi-objective optimization to enhance heat transfer within flow channels. The method considers the influence of structures on hydrothermal performance and speeds up the development process. Numerical results demonstrate the effectiveness and advantages of this approach.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Review
Green & Sustainable Science & Technology
Mohamed H. Mousa, Nenad Miljkovic, Kashif Nawaz
Summary: Enhancing heat transfer between fluids and walls is crucial for improving performance. By utilizing features that enhance heat transfer, equipment size can be reduced, costs minimized, and safety risks mitigated.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Thermodynamics
Saadah Ahmad Sowi, Shahrir Abdullah, Kamaruzzaman Sopian
Summary: The study introduced a new innovative twisted tape with linearly increasing/decreasing pitch ratio combined with different nanofluids. Among the different geometries, TT LIPR 0.25 showed the highest turbulent kinetic energy value. TT LIPR was found to be the best choice under turbulent flow regime with Reynolds number >10,000, creating higher overall enhancement ratio compared to other geometries.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Green & Sustainable Science & Technology
Amit Kumar, Akshayveer, Ajeet Pratap Singh, O. P. Singh
Summary: This paper investigates a new curved design of a counter flow double-pass solar air heater with arched baffles placed in the second duct. The introduction of arched baffles accelerates the flow near the absorber and facilitates the formation of large secondary vortices, resulting in enhanced thermal and hydraulic performance. The study also develops two regression correlations for predicting the thermo-hydraulic performance based on geometric and flow parameters.
Article
Thermodynamics
Jyoti Prakash Panda, Bipin Kumar, Manoj Kumar, Anil Kumar Patil
Summary: This study investigates the impact of the length and twist ratio of twisted tape inserts on heat transfer performance in heat exchangers. The results show that the maximum heat transfer and thermo-hydraulic performance are achieved at a length ratio of 0.75 and a twist ratio of 1.5.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Shrikant Arunrao Thote, Netra Pal Singh
Summary: This study describes the thermo-hydraulic properties of circular tubes with a twisted tape inside, which is used to induce turbulence and enhance heat transfer. The experiment covers a range of Reynolds Numbers from 830 to 1990. The results show that the twisted tape significantly improves the frictional factor, Nusselt Number, and thermal performance factor compared to the plain tube. The tape with the lowest twist ratio (3) is found to be the most effective in terms of heat transfer augmentation. The thermal performance factor is greater than one for all the twisted tapes used in the experiments, indicating enhanced heat exchanger performance and energy savings.
FDMP-FLUID DYNAMICS & MATERIALS PROCESSING
(2023)
Article
Thermodynamics
Ramin Mashayekhi, Amir Hossein Eisapour, Mehdi Eisapour, Pouyan Talebizadehsardari, Alireza Rahbari
Summary: The study investigates the thermo-hydraulic performance of a twisted elliptical tube equipped with twisted tape inserts, showing significant improvement in Nusselt number and friction factor under specific conditions compared to smooth elliptical tube case. The proposed technique achieves a PEC number above unity, with the highest PEC of 1.6 at the optimum pitch of L/3 for both twisted elliptical tube and twisted tape insert under Reynolds number of 1000.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
V. Karthickeyan, S. Thiyagarajan, B. Ashok, V. Edwin Geo, A. K. Azad
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Environmental Sciences
Shuang Wang, Karthickeyan Viswanathan, Sivakumar Esakkimuthu, Kalam Azad
Summary: This study investigates the performance and emission characteristics of a Kirloskar single-cylinder direct injection diesel engine fueled with orange oil methyl ester (OME) as an alternative fuel, with the addition of oxygenated additives like ethanol and diethyl ether. The OME10DEE blend showed improved fuel properties and higher performance characteristics compared to diesel, with a significant reduction in HC, NOx, and smoke emissions. The study recommends the application of OME10DEE as a renewable and cleaner alternative fuel for diesel engines.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Thermodynamics
Manabendra Saha, Giovanni Gitto, Bassam B. Dally
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2020)
Article
Energy & Fuels
Koushik Ahmed, Omar Farrok, Md Mominur Rahman, Md Sawkat Ali, Md Mejbaul Haque, Abul Kalam Azad
Article
Green & Sustainable Science & Technology
Tikendra Nath Verma, Prerana Nashine, Prem Kumar Chaurasiya, Upendra Rajak, Asif Afzal, Sakendra Kumar, Dheerendra Vikram Singh, A. K. Azad
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2020)
Review
Energy & Fuels
M. A. Hazrat, M. G. Rasul, M. Mofijur, M. M. K. Khan, F. Djavanroodi, A. K. Azad, M. M. K. Bhuiya, A. S. Silitonga
FRONTIERS IN ENERGY RESEARCH
(2020)
Review
Energy & Fuels
S. F. Ahmed, G. Liu, M. Mofijur, A. K. Azad, M. A. Hazrat, Yu-Ming Chu
Summary: This paper reviews the physical and hybrid EAHE modelling techniques used in buildings, highlighting their prospects, benefits, progress, and challenges. The study found that hybrid modelling is more effective than physical models, but requires consideration of operational conditions and key parameters during model development. In terms of generalization capability and training data, physical models have advantages.
Article
Energy & Fuels
Arslan Mazhar, Asif Hussain Khoja, Abul Kalam Azad, Faisal Mushtaq, Salman Raza Naqvi, Sehar Shakir, Muhammad Hassan, Rabia Liaquat, Mustafa Anwar
Summary: Co/TiO2-MgAl2O4 composite showed excellent catalytic activity in the dry reforming of methane process, with the 5%Co loading exhibiting the best performance. The catalyst significantly improved the conversion rates of CH4 and CO2, as well as the selectivity of H-2 and CO. In stability tests, the catalyst demonstrated lasting activity for up to 75 hours, indicating potential for long-term use in the dry reforming process.
Article
Energy & Fuels
Prem Kumar Chaurasiya, Sanjay Kumar Singh, Piyush Kumar Jain, Upendra Rajak, Tikendra Nath Verma, A. K. Azad, Keshavendra Choudhary, Abeer M. Alosaimi, Anish Khan
Summary: This study investigates the effect of corrugations on the outer and inner surface of the inner tube in a double pipe heat exchanger through numerical simulation. The results show that the externally corrugated inner tube provides better heat transfer efficiency compared to the internally corrugated tube.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Review
Green & Sustainable Science & Technology
A. T. Doppalapudi, A. K. Azad, M. M. K. Khan
Summary: The modification of combustion chambers in diesel engines has shown positive effects on performance and emissions, but the impact of turbulence on nitrogen oxide emissions and potential engine failures needs further investigation. Recent studies have shown that these modifications can affect air-fuel mixture rates, fluid distribution, heat transfer rates, and emission formations.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Energy & Fuels
Md Saif Hassan Onim, Zubayar Mahatab Md Sakif, Adil Ahnaf, Ahsan Kabir, Abul Kalam Azad, Amanullah Maung Than Oo, Rafina Afreen, Sumaita Tanjim Hridy, Mahtab Hossain, Taskeed Jabid, Md Sawkat Ali
Summary: Electricity production from photovoltaic systems has increased rapidly, but dust accumulation on PV panels leads to energy loss. Various techniques including thermal imaging, image processing, sensors, cameras with IoT, machine learning, and deep learning are being researched to detect dust and reduce power loss. This study introduces a new dataset of dusty and clean panel images and proposes a convolutional neural network called SolNet specifically for dust detection. SolNet shows a higher accuracy level of 98.2% compared to other state-of-the-art algorithms, making it a benchmark for future research. The dataset can be expanded for multiclass classification and the SolNet model can be fine-tuned for further improvements.
Review
Energy & Fuels
Asim Kumar Sarker, Abul Kalam Azad, Mohammad G. G. Rasul, Arun Teja Doppalapudi
Summary: This study aims to analyze the generation of hydrogen from solar and wind energy sources and observe the broad prospects in producing green hydrogen using hybrid renewable energy sources. The study focuses on the critical assessment of solar, wind, and hybrid-powered electrolysis technologies in hydrogen production, as well as addressing the key challenges and opportunities associated with commercial-scale deployment.
Article
Energy & Fuels
Arun Teja Doppalapudi, Abul Kalam Azad, Mohammad Masud Kamal Khan
Summary: This study numerically analyzes the effects of chamber modifications on the combustion characteristics of a diesel engine using computational fluid dynamics (CFD). Five different modified chambers were developed and compared, and their effects on temperature formation, velocity distribution, injection profiles, and in-cylinder turbulent motions were investigated. The study found that shallow depth, bathtub, and double swirl chambers showed better combustion characteristics compared to the reference chamber in terms of temperature, heat release rate, and velocity distribution.
Article
Transportation Science & Technology
Qing Wu, Abul Kalam Azad, Colin Cole, Maksym Spiryagin
Summary: This study proposed a method to identify severe track defect combinations that pose greater risks for vehicle derailments. By conducting over 5,000 simulations using supercomputers, a tabular tool was developed to help infrastructure managers adjust maintenance reactions when track defects are found in combinations.
INTERNATIONAL JOURNAL OF RAIL TRANSPORTATION
(2022)
Article
Energy & Fuels
Asif Hussain Khoja, Abul Kalam Azad, Faisal Saleem, Bilal Alam Khan, Salman Raza Naqvi, Muhammad Taqi Mehran, Nor Aishah Saidina Amin
