Article
Environmental Sciences
Guihao Yin, Qinwu Li, Zhongyang Zhao, Lianmin Li, Longchao Yao, Weiguo Weng, Chenghang Zheng, Jiangang Lu, Xiang Gao
Summary: An accurate NOx concentration prediction model is crucial for low NOx emission control in power stations to comply with environmental policies. This study utilizes LSTM models to predict NOx concentrations at different operating conditions, proposing a composite model for improved accuracy. Results show that the composite LSTM model outperforms single LSTM and other non-time-sequence models in predicting NOx concentration and fluctuation trends.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Thermodynamics
Chengjun Li, Juan Hou, Yaran Wang, Shen Wei, Pengkun Zhou, Zhihao He, Yeming Wang, Huan Zhang, Shijun You
Summary: The performances of smooth-tube and corrugated-tube heat exchangers for ice storage are compared in this paper. Numerical analysis and experiments show that the corrugated-tube heat exchanger has a shorter ice storage duration (25% reduction) and melting duration (16% reduction) compared to the smooth-tube heat exchanger. Additionally, the temperature change rate in the corrugated tube is faster than that in the smooth tube during both ice storage and melting processes.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Rahim Hassanzadeh
Summary: This study investigates the effects of combustion chamber location and tube bundle layout on the performance of three-pass hot-water steel boilers under steady-state operation. The results show that changing the combustion chamber location greatly affects the boiler performance, and the gap space between the second and third passes and tube bundle layout have considerable influence on heat and momentum transfer inside the boiler.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Ibrahim B. Mansir, Rached Ben-Mansour, Mohamed A. Habib
Summary: Oxy-fuel combustion technology is seen as a promising option for reducing CO2 emissions, but heat transfer challenges need to be addressed when integrating it into fire-tube boilers. The study found that the heat transfer characteristics to saturated water and steam varied at different operating pressures, emissivities, and thermal conductivities.
APPLIED THERMAL ENGINEERING
(2021)
Article
Environmental Sciences
Zhizhou Yang, Lei Zou, Jun Xia, Yunfeng Qiao, Diwen Cai
Summary: Urban water quality is deteriorating due to lack of monitoring data and complexity of urban water systems. The integration of different methods and models, supported by multi-remote sensing data, provides a better understanding of the mechanisms and dynamics of water quality changes. The developed integrated method successfully predicts urban water quality and suggests possible driving factors for deterioration.
Article
Thermodynamics
Gregory Peck, Jaehun Shin, Seoksu Moon
Summary: This study discusses the effect of injecting water into the intake air of waste-heat-recovery boilers on improving thermal efficiency and reducing NOx emissions. A high-frequency injection strategy is introduced to enhance spray atomization and supply continuous water to the heat exchanger. Experimental results show that increasing the injection frequency leads to a decrease in droplet size and improves the spatial and temporal homogeneity of the spray distribution.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Green & Sustainable Science & Technology
M. R. Rodriguez-Sanchez, M. Laporte-Azcue, A. Montoya, F. Hernandez-Jimenez
Summary: This study analyzes several novel tube shapes for solar tubular receivers with the aim of reducing stresses while maintaining thermal efficiency. Thermal and mechanical models are used, with FEM simulations verifying the assumptions made due to limited experimental data. Oval cross-section tubes improve thermal efficiency but increase stresses, while semicircle tubes reduce stress by 10.9% without compromising thermal performance. The use of asymmetric cross-section tubes with low rear-front surface ratios and smooth front surfaces are considered a good alternative to traditional circular tubes in central receivers.
Article
Construction & Building Technology
Marcos Hongn, Facundo Bre, Marcelo Valdez, Silvana Flores Larsen
Summary: This study introduces two new Resistance-Capacitance (RC) network models for the main concrete layer of an APES system. The Delta RC network shows similar performance to existing models, while the Umbrella RC network has higher accuracy at higher frequencies.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Energy & Fuels
Quanyi Chen, Xuan Zhang, Pengbo Nie, Siwei Zhang, Guodan Wei, Hongbin Sun
Summary: The temperature has a significant impact on the lifespan and safety of electric vehicle batteries. To balance thermal safety and energy savings, a well-designed battery thermal management system is necessary. This study proposes an electro-thermal model and a model predictive control framework to evaluate and regulate the thermal dynamics of the battery cooling module, considering both safety and energy goals.
Article
Thermodynamics
Haoran Liu, Jiaqi Yu, Ruzhu Wang
Summary: In portable electronic devices, both the junction temperature and skin temperature need to be controlled. This paper proposes a convolution-based method to generate dynamic compact thermal models for predicting skin temperature. A linear fitting model is also proposed for real-time prediction of skin temperature in laptops. Experimental and simulation results show great potential of this modeling method in thermal design and control optimization.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Shen Tian, Haozhi Bai, Na Hui, Hongyuan Gao, Shuangquan Shao, Zhili Sun, Shengchun Liu
Summary: The study proposed an optimization analytical model for tube-in-tank PCM systems and validated it through experiments, with prediction errors of energy storage capacity between 1.86% and 8.81%. Parametric analysis of geometric parameters and tube materials of the system were also discussed.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Roberto Tascioni, Luca Cioccolanti, Piero Pili, Emanuele Habib
Summary: This work presents the development of a fast and reliable simulation tool for estimating the receiver tube wall temperature and performance of small-scale Linear Fresnel Reflectors (LFRs) solar fields. The proposed model includes a more detailed analysis of heat transfer between the fluid and receiver tube wall, and can assess the performance under different conditions. The results show that buoyancy driven flow greatly enhances heat transfer, and a newly defined parameter called Load Temperature correlates well with the receiver tube wall temperature. Furthermore, the proposed model improves the estimation of collected thermal energy compared to the reference model.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Mechanics
Michael J. Wood, Damon G. K. Aboud, Gianluca Zeppetelli, Mohammad Bagher Asadi, Anne-Marie Kietzig
Summary: This article introduces a graphical user interface (GUI) called ARCA Finder, which simplifies the analysis process of contact angle goniometry and improves measurement accuracy by displaying the data in a novel perspective and aiding the user to determine the most accurate measurement based on the full definition of dynamic contact angles. The goal of this invention is to reduce human error in goniometry and improve the repeatability of measurements among different researchers. Results from testing this approach on synthetic and real dynamic contact angle videos demonstrate a noticeable difference in the measured values, suggesting that the ARCA Finder GUI improves measurement accuracy compared to the standard approach.
Article
Computer Science, Information Systems
Xiuquan Li, Meizhen Wang, Xuejun Liu, Ziran Wang, Yuxia Bian
Summary: Road network models are essential for road network analysis, route planning, navigation, and traffic predictions. This study addresses the limitation of existing models in effectively representing the dynamic topological relationships among lanes. A time-dependent road network model (TRNM) is proposed to address this issue, and its construction method based on a traditional carriageway network model is presented. Experimental results demonstrate that TRNMs can be constructed easily from traditional road networks without introducing large volumes of data, while effectively representing the time-dependent topological relationships among lanes.
INTERNATIONAL JOURNAL OF GEOGRAPHICAL INFORMATION SCIENCE
(2022)
Article
Thermodynamics
Yinlong Liu, Guoqiang Xu, Yanchen Fu, Jie Wen, Haoran Huang
Summary: This paper introduces a novel air-fuel heat exchanger used for cooling air technology in aero-engines. The helical tube heat exchanger has a weight of 1.1 kg and an area density of 214 m2/m3, and it can cool hot air down 260 K at an air flow rate of 0.3 kg/s with a pressure drop of less than 0.6%. Empirical correlations demonstrate good predictability of pressure drop and convective heat transfer coefficient for hot gas cross-flowing helical tube bundles. Tube failure tests indicate that the bent tube can continue to perform under extremely high tube wall temperature and the secondary flow in bent tubes can improve heat transfer performance and reduce coke deposition.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Binash Imteyaz, Mohamed Habib, Medhat Nemitallah, Ahmed Abdelhafez, Rached Ben-Mansour
Summary: This work investigates the stability and combustion characteristics of oxy-methane/hydrogen flames in a premixed swirl-stabilized combustor. Near-stoichiometry flames exhibit strong inner recirculation zones and are stabilized between two shear layers. The Reynolds number has a limited effect on flame shape, but higher Reynolds numbers result in flow dominated by larger primary eddies.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Asif Ali, Medhat A. Nemitallah, Ahmed Abdelhafez, Muzafar Hussain, M. Mustafa Kamal, Mohamed A. Habib
Summary: The study compared the macrostructure and stabilization parameters of premixed oxy-propane and oxygen-enriched air-propane flames in a model dry-low-emissions gas turbine combustor. It was found that both types of flames followed constant adiabatic flame temperature contours on the stability maps, indicating that flames blow out and flashback limits are affected by AFT rather than oxygen fraction or equivalence ratio.
Article
Energy & Fuels
Sherif S. Rashwan, Bassel Abdelkader, Ahmed Abdalmonem, Tharwat W. Abou-Arab, Medhat A. Nemitallah, Mohamed A. Habib, Abdelmaged H. Ibrahim
Summary: This study compared the performance of oxy-combustion flames with air-combustion flames under different operating conditions, showing that the flammability limits of oxy-flames widen with increasing oxygen fraction, and the visible flame length of oxy-flames is longer than that of air-flames.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Energy & Fuels
Medhat A. Nemitallah, M. D. Azazul Haque, Muzafar Hussain, Ahmed Abdelhafez, Mohamed A. Habib
Summary: This article reviews the combustion technologies for reducing emissions and improving fuel economy in industrial gas turbines. It introduces low-temperature combustion techniques and methods for controlling NOx emissions. The challenges faced by current combustion technologies are discussed, and improved designs and strategies are proposed to overcome these challenges.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Thermodynamics
A. A. Araoye, A. Abdelhafez, M. A. Nemitallah, M. A. Habib, R. Ben-Mansour, M. Hussain
Summary: This study experimentally investigated the effects of H-2-enrichment on premixed oxy-methane flames and found that it can widen the stable combustion zone.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Rached Ben-Mansour, M. D. Azazul Haque, Aadesh Harale, Stephen N. Paglieri, Firas S. Alrashed, Mohammad Raghib Shakeel, Esmail M. A. Mokheimer, Mohamed A. Habib
Summary: The study on the membrane-integrated reformer reactor (MRR) demonstrated that optimizing the steam-to-methane ratio and flow rate can significantly enhance methane conversion and hydrogen recovery. Additionally, the introduction of sweeping steam plays a crucial role in improving hydrogen recovery efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Energy & Fuels
Md Azazul Haque, Medhat A. Nemitallah, Ahmed Abdelhafez, Esmail M. A. Mokheimer, Mohamed A. Habib
Summary: This study investigates the characteristics and emissions of premixed oxy-combustion flames in a combustor, comparing the effects of different fuels. The results show that increasing the equivalence ratio improves certain parameters important for gas turbine combustion, but also leads to higher CO emissions. Among the fuels studied, oxy-methane flames have the highest flame thicknesses and lowest CO emissions, while oxy-propane flames have higher values of temperature, flame speed, power density, and thermal power.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Chemistry, Multidisciplinary
Melek Hajji, Nadeem Abad, Mohamed A. Habib, Salima Moftah H. Elmgirhi, Taha Guerfel
Summary: In this review, state-of-the-art computational chemistry approaches for investigating non-covalent interactions, as well as theoretical methods for exploring chemical reactivity, are discussed. The work aims to provide beginners and non-experts with a thorough background to understand the validity and limitations, and how to avoid errors during simulations.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2021)
Article
Thermodynamics
Mansur Aliyu, Ahmed Abdelhafez, Medhat A. Nemitallah, Syed A. M. Said, Mohamed A. Habib
Summary: This study compares the combustion characteristics of premixed methane oxygen-enriched air and oxymethane in a gas-turbine model combustor. The results show that both CO2 and N-2 flames experience blowout at constant adiabatic temperature, with CO2 flames having a higher blowout OF value. The stable combustion zone of CO2 flames is larger than that of N-2 flames.
Article
Chemistry, Multidisciplinary
Mahmoud M. Abdelnaby, Tawfik A. Saleh, Mostafa Zeama, Mahmoud Atef Abdalla, Hossam M. Ahmed, Mohamed A. Habib
Summary: The synthesis of porous organic polymers with designed polar functionalities and their applications in carbon dioxide capture and metal ion removal are of great significance for environmental purposes. In this study, two azo-linked porous organic polymers were successfully synthesized and demonstrated high surface areas and excellent CO2 capture and heavy metal ion removal capabilities.
Article
Chemistry, Multidisciplinary
Mohamed A. Habib, Md Azazul Haque, Medhat A. Nemitallah, Ahmed Abdelhafez, Atia E. Khalifa
Summary: The characteristics of premixed oxy-propane flames in a multihole model gas turbine combustor are investigated numerically. The results show that the flame shape in the multihole combustor is highly influenced by the adiabatic flame temperature. Compared to a swirl stabilized combustor, the multihole combustor exhibits higher flame thickness, increased CO emission, and lower Damko'hler number.
Article
Chemistry, Applied
Mahmoud M. Abdelnaby, Hossam M. Ahmed, Ahmed M. Alloush, Mostafa Zeama, Mohamed A. Habib, Hamza Asmaly, Tawfik A. Saleh
Summary: Environmental remediation has become a global concern due to the impact of carbon dioxide on climate change and water contamination and scarcity. In this study, three new solid sorbent materials were designed and synthesized for the removal of carbon dioxide and metal ions from water. These materials showed high efficiency in removing toxic metal ions and organic contaminants from wastewater. The study highlights the importance of porous materials in environmental remediation.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Energy & Fuels
R. Ben-Mansour, M. A. Haque, M. A. Habib, S. Paglieri, A. Harale, E. M. A. Mokheimer
Summary: This study aims to investigate the effect of thermal boundary conditions on steam-methane reforming (SMR) and hydrogen recovery. Computational analysis is performed to examine the impact of constant and variable temperatures/heat fluxes, as well as radiation and transient inlet temperatures, on important parameters such as CH4 conversion, H2 recovery, H2 mass flow rates, and hydrogen mass flux through the membrane. The results show that increasing the reformer temperature leads to a higher methane conversion but a lower hydrogen recovery. Segmented conditions result in decreased methane conversion but increased hydrogen recovery compared to constant heat flux and temperature cases. Additionally, varying the temperature profile affects the conversion and recovery rates differently.
Article
Materials Science, Paper & Wood
Abdulrahman G. Alhamzani, Mohamed A. Habib
Summary: Research interest in nanocellulose has increased due to its unique properties and performance, with nanocellulose being considered as a precursor for industrial products and smart applications. By utilizing bio-based degradable by-products, nanocellulose with high crystallinity was successfully prepared, showing smaller diameter and smoother surface. The obtained cellulose nanocrystals (CNCs) from low-cost byproducts could further serve as a biodegradable matrix material.
CELLULOSE CHEMISTRY AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Marwa Belkhiria, Melek Hajji, Ali Mechria, Salima Moftah H. Elmgirhi, Mohamed A. Habib, Tiago F. C. Cruz, Clara S. B. Gomes, Pedro T. Gomes, Radhouane Bel-Hadj-Tahar, Taha Guerfel, Moncef Msaddek
Summary: A neutral complex, [bis(2,6-dimethyl-N-((thiophen-2-yl)methylene) benzenamine))]nickel(II) dibromide, has been successfully synthesized and characterized, with its molecular structure and crystal assembly maintained by weak non-conventional C-H···Br hydrogen bonding, π···π and C-H···π interactions. The use of Hirshfeld surfaces visualizes intermolecular interactions, while DFT reactivity calculations and molecular electrostatic potential approach predict the most reactive sites in polar organic reactions for the studied system.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2021)
