Khalee Ali Khudhur, Seyed Esmail Razavi, Mir Biuok Ehghaghi Bonab
{"title":"Machine learning insights and performance assessments into nanofluid-enhanced PV-T solar collector","authors":"Khalee Ali Khudhur, Seyed Esmail Razavi, Mir Biuok Ehghaghi Bonab","doi":"10.1016/j.ijft.2025.101337","DOIUrl":"10.1016/j.ijft.2025.101337","url":null,"abstract":"<div><div>Photovoltaic-thermal (PV-T) systems combine solar thermal absorbers with PV cells, enhancing solar energy capture by producing both electrical and thermal energy. This hybrid setup improves PV cell efficiency and supports heating applications. Artificial Neural Network (ANN) models, effective in handling complex, non-linear interactions, are used to predict PV-T performance under various conditions. In this study, a photovoltaic/thermal (PV-T) collector employing nanofluids as the cooling medium is thoroughly investigated. Numerical models are developed to analyze the influence of key operating parameters, such as nanofluids type and their concentration, solar irradiation, and mass flow rate, on performance indicators of PV-T collectors. This research introduces a novel approach by integrating an artificial neural network (ANN) model to performance prediction of the PV-T collector. The ANN model is validated against numerical data and provides a tool that aids in both optimizing operating conditions of the PV-T collector and rapidly designing new experiments. Key findings reveal that increasing nanofluid concentration enhances convective heat transfer, reducing absorber plate temperatures. For Al₂O₃-Water at a flow rate of 3 L/min, maximum absorber plate temperatures drop to 313 K, 312 K, and 310 K for concentrations of 1 %, 2 %, and 3 %, respectively—reductions of up to 6 K compared to water. Similarly, CuO-Water achieves reductions of up to 7 K under the same conditions. The ANN model achieves R² values exceeding 0.97 for all performance metrics, with prediction errors below 0.1 for Al₂O₃-Water and 0.05 for CuO-Water electrical efficiency.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"29 ","pages":"Article 101337"},"PeriodicalIF":0.0,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Davood Domiri Ganji, Fateme Nadalinia Chari, Mehdi Mahboobtosi
{"title":"Semi-analytical modeling of compact flow with mass and heat exchange: a python-based approach","authors":"Davood Domiri Ganji, Fateme Nadalinia Chari, Mehdi Mahboobtosi","doi":"10.1016/j.ijft.2025.101336","DOIUrl":"10.1016/j.ijft.2025.101336","url":null,"abstract":"<div><div>In this paper, the compact flow with mass and heat exchange for a two-dimensional incompressible viscous fluid between two parallel plates is investigated using semi-analytical methods. The study of compact flow with mass and heat exchange has numerous applications in medicine, including modeling blood flow in vessels, designing controlled drug delivery systems, simulating heat transfer in the body, and designing bioreactors for cell culture. The governing partial differential equations (PDE) are transformed into dimensionless nonlinear ordinary differential equations (ODE) using an appropriate transformation. Then, the equations are solved using the Akbari–Ganji method (AGM) and differential transform method (DTM). Python has been used as a powerful tool for solving engineering problems in this research. The innovation of this research is the use of semi-analytical methods to derive explicit solutions for flow, temperature, and concentration profiles in a complex squeezing flow system, implemented entirely in Python for enhanced accuracy and efficiency. Also, the Nusselt number, skin friction coefficient and Sherwood number have been investigated using ANOVA analysis. The results show that increasing Ec from 1 to 3 at η = 0.4 increases the temperature profile by 45.28 %. Also, increasing S from -1.5 to 1.5 increases the temperature profile by 8.2 % at η = 0.2. The results show that increasing S increases the temperature and concentration profile due to stronger pressure effects. Also, increasing γ significantly reduces the concentration profile and Sherwood number. ANOVA was also used to examine the simultaneous effect of different parameters on the skin friction coefficient, Nusselt number, and Sherwood number.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"29 ","pages":"Article 101336"},"PeriodicalIF":0.0,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mohadeseh Naderi , Hamid Rashidi , Anthony Reynolds , Wayne Doherty
{"title":"Aspen Plus modelling of the MILENA dual fluidised bed biomass gasifier technology","authors":"Mohadeseh Naderi , Hamid Rashidi , Anthony Reynolds , Wayne Doherty","doi":"10.1016/j.ijft.2025.101334","DOIUrl":"10.1016/j.ijft.2025.101334","url":null,"abstract":"<div><div>The Energy Research Centre of The Netherlands is developing MILENA gasification technology to convert biomass fuels into high-value gaseous and liquid products. MILENA is a steam-blown dual fluidised bed (DFB) gasification process with separate gasification and combustion zones. This DFB gasifier produces high-quality gas with low N<sub>2</sub> content suitable for vehicle fuel or natural gas grid injection. This study presents a semi-kinetic Aspen Plus model for MILENA gasification, including stages like drying, rapid pyrolysis, gasification, combustion, and tar cracking and reforming. Pyrolysis as a key step, was modelled using experimental data for the rapid pyrolysis of wood to calculate the yields of gases, char and tar. The gasification step is modelled as a continuous stirred-tank reactor (CSTR) and considers reaction kinetics. The simulation results, including product gas composition, mass flow rate, and tar concentration, were validated against experimental data for the MILENA gasifier, showing very good agreement. A low relative error of 0.39 % was the lowest for H<sub>2</sub> and 4.17 % was the highest for CO<sub>2</sub> in product gas composition, validating the model’s accuracy. The lower heating value (LHV) of the dry gas mixture was calculated. Sensitivity analyses demonstrated that H<sub>2</sub> increases with moisture content, supporting the role of the water gas shift (WGS) reaction. Additionally, variations in STBR significantly affect the gas composition.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"29 ","pages":"Article 101334"},"PeriodicalIF":0.0,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Munawar Abbas , Mostafa Mohamed Okasha , Dilsora Abduvalieva , Ali Akgül , Murad Khan Hassani , Ali Hasan Ali , Zuhair Jastaneyah , Hakim AL Garalleh
{"title":"Numerical simulation of higher order chemical reactive flow of ternary hybrid nanofluid across an extending cylinder with heat generation and induction effects","authors":"Munawar Abbas , Mostafa Mohamed Okasha , Dilsora Abduvalieva , Ali Akgül , Murad Khan Hassani , Ali Hasan Ali , Zuhair Jastaneyah , Hakim AL Garalleh","doi":"10.1016/j.ijft.2025.101330","DOIUrl":"10.1016/j.ijft.2025.101330","url":null,"abstract":"<div><div>This study scrutinizes the influences of magnetic induction on the chemical reactive flow of trihybrid nanofluid with heat transfer in a boundary layer across an extended cylinder containing metallic nanoparticles. The trihybrid nanofluid is produced by dispersing silicon dioxide, cobalt ferrite nanoparticles in water and titanium dioxide, the base liquid. In energy conversion devices, thermal management systems, and chemical and petrochemical reactors where improved heat and mass transmission are essential, it is especially pertinent. Thermal conductivity is enhanced by the addition of ternary hybrid nanofluids, which makes the model applicable to cooling systems and nanocoating applications. The addition of chemical reactions, magnetic induction, and heat generation further increases its applicability to fields like nuclear engineering, biomedical devices, and smart manufacturing systems that need to precisely manage reactive transport phenomena. The basic fluid's thermos-physical properties are considerably improved by the addition of ternary hybrid nanoparticles. The bvp4c method is used to confirm the results' authenticity and accuracy. Figures and Tables are used to present and analyze the results. It has been noted that the liquid flow is decreased and magnetic induction profile is improved by the magnetic Prandtl number.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"29 ","pages":"Article 101330"},"PeriodicalIF":0.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mehdi Mahboobtosi , Alireza Domiri Ganji , Shabnam Shahri , Fateme Nadalinia Chari , Davood Domiri Ganji
{"title":"Comparative analysis of penta-hybrid and ternary hybrid nanofluids in a rotating porous stretchable channel with mhd and thermal radiation effects","authors":"Mehdi Mahboobtosi , Alireza Domiri Ganji , Shabnam Shahri , Fateme Nadalinia Chari , Davood Domiri Ganji","doi":"10.1016/j.ijft.2025.101328","DOIUrl":"10.1016/j.ijft.2025.101328","url":null,"abstract":"<div><div>This work examines the ternary hybrid nanofluid and the penta hybrid nanofluid flow in a porous and stretchable rotating channel with the dual effects of magnetic fields, thermal radiation, chemical reactions, and internal heat generation. The nonlinear differential equations governing the flow are dimensioned with similarity variables and solved with the bvp4c solver in MATLAB. The main thermofluid parameters such as velocity components, temperature and concentration distributions, wall shear stress, and the Nusselt number are examined in the context of various parameter values. As Reynolds number increases, the velocity profile decreases. As Reynolds number increases, the temperature and concentration profiles also decrease. The results show that improving rotation parameter reduces transverse velocity while improving the temperature profile. Increasing the suction parameter reduces the concentration. Also, increasing the stretching ratio parameter improves the temperature. The results indicate the skin friction coefficient to be reduced in penta hybrid nanofluid compared to ternary hybrid nanofluid. Also, the Nusselt number is enhanced in penta hybrid nanofluid compared to ternary hybrid nanofluid. These results are important contributions to enhancing the efficiency of heat and mass transfer technologies in high-technology industries. Practical implications of this study find applications in the optimization of cooling systems in high-performance electronics, energy conversion in solar thermal collectors, chemical processing heat exchangers, and thermal management in the case of rotating machinery and microfluidic devices.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"29 ","pages":"Article 101328"},"PeriodicalIF":0.0,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Md. Hasanuzzaman , Md.Abul Kalam Azad , Md.Mosharof Hossain , Bappi Mridha , Mohammed Abdur Rahman
{"title":"Effect of thermal radiation on MHD natural convective transport of micropolar fluid through a perforated sheet: An unsteady approach","authors":"Md. Hasanuzzaman , Md.Abul Kalam Azad , Md.Mosharof Hossain , Bappi Mridha , Mohammed Abdur Rahman","doi":"10.1016/j.ijft.2025.101329","DOIUrl":"10.1016/j.ijft.2025.101329","url":null,"abstract":"<div><div>In the present investigation, the influence of thermal radiation on time-dependent MHD-free convection of micropolar fluid flow through a perforated sheet is analyzed. To obtain the mathematical solutions, the set of nonlinear ordinary differential equations (ODEs) has been converted from governing partial differential equations (PDEs). The shooting method in the MATLAB environment is then utilized to resolve the transformed system. The influences of several physical parameters upon concentration, temperature, microrotation, and dimensionless velocity profiles are deliberated and revealed graphically. When the thermal radiation (R) is high, it indicates that surface couple stress h′(0)) and local skin friction (f′(0)) are enhanced, but the heat transfer rate (− θ′(0)) is reduced. So, the velocity and the temperature are lifted up, but the microrotation is slowed down for higher amounts of R. The amounts of (f′(0)) and h′(0)) advance by about 25 % and 24 % but reduce the heat transfer rate by about 41 % for growing levels of R (1.0–4.0). With some restrictions, the results are contrasted with previous research. The outcomes agree well with the existing ones.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"29 ","pages":"Article 101329"},"PeriodicalIF":0.0,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Matteo Venturelli , Lisa Branchini , Andrea De Pascale , Luca Montorsi
{"title":"Editorial: Low carbon combined heat and power technologies and renewables for energy-intensive industries","authors":"Matteo Venturelli , Lisa Branchini , Andrea De Pascale , Luca Montorsi","doi":"10.1016/j.ijft.2025.101323","DOIUrl":"10.1016/j.ijft.2025.101323","url":null,"abstract":"","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"28 ","pages":"Article 101323"},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sofia Villaveces , Zhaochong Yu , Mohana Priya , Lorenna Altman , Qichen Fang , Ryan Bellacov , Rosalyn Davis , Kermit Davis , Ashley Kubley , Myoung Ok Kim , Mark Schulz , Vesselin Shanov , William Jetter , W. Jon Williams , M Minhaj , Md Zahid Hasan , Marepalli Rao , Amit Bhattacharya
{"title":"Effectiveness of a state-of-the-art coat with fans and coolants over standard coats","authors":"Sofia Villaveces , Zhaochong Yu , Mohana Priya , Lorenna Altman , Qichen Fang , Ryan Bellacov , Rosalyn Davis , Kermit Davis , Ashley Kubley , Myoung Ok Kim , Mark Schulz , Vesselin Shanov , William Jetter , W. Jon Williams , M Minhaj , Md Zahid Hasan , Marepalli Rao , Amit Bhattacharya","doi":"10.1016/j.ijft.2025.101288","DOIUrl":"10.1016/j.ijft.2025.101288","url":null,"abstract":"<div><h3>Objective</h3><div>Firefighters use personal protective equipment when containing fires. The coat, called standard hereafter, that is part of the personal protective equipment has not changed for many years. A new coat was designed with novel features. Its inner layer is made of a carbon nanotube-based fabric, two pouches with coolants, and fans. The new coat and standard coat were to be compared on several metrics including core body temperature, heart rate, heart rate variability, heat storage, aerobic capacity, Borg scale, Thermal Comfort scale, and Respiratory Distress in a live burn facility.</div></div><div><h3>Principle results</h3><div>The new coat was significantly better than the standard coat on all metrics with one exception, namely, Thermal Comfort scale. The coats significantly impact the average core body temperature across all epochs with <em>p</em> < 0.0001. They also impact heart rate with <em>p</em> < 0.0001, heart rate variability with <em>p</em> = 0.0019, and heat storage with <em>p</em> < 0.0001.</div></div><div><h3>Major conclusion</h3><div>One important mission for any coat was to ensure that the core body temperature does not reach the hyperthermia level temperature (38° C) when a firefighter is working inside a live burn facility. The new coat worked on this count better than the standard coat with <em>p</em> = 0.0144.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"28 ","pages":"Article 101288"},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Modification of the flow pattern in ducts outlet and economizer chamber for optimization of existing high pressure boilers to improve boiler performance","authors":"Abbas Behzadi , Ali Akbar Abbasian Arani","doi":"10.1016/j.ijft.2025.101310","DOIUrl":"10.1016/j.ijft.2025.101310","url":null,"abstract":"<div><div>Industrial steam boilers play a pivotal role in various processes across industries, consuming significant energy resources. Enhancing the energy efficiency of these boilers is of paramount importance in the current scenario of energy conservation. This paper presents a comprehensive study on the upgrading of existing boilers ducts by incorporating an additional economizer, facilitated by thermal and draft calculation study. The existing ducts which are at service for a long time will be substituted by the new one with consideration of technical investigation. The primary focus is to enhance the efficiency of conventional boilers by optimizing the heat transfer process through the newly added economizer. The paper outlines the methodology employed for analysis, modeling, and simulation of the flue gas ducts, presents Fluent -generated results, and discusses the implications of the findings on overall heater efficiency. In this direction, in order to study and design the optimal mode of ducts to prevent operational difficulties and optimal operational performance conditions, various plans are examined and the best method is selected for boilers optimization. In total, for five boilers, it reduces fuel consumption and pollutant emissions by 47,000 tons and 1.7 million tons, respectively, in one year. In addition, the social cost of carbon is also reduced by 3.3 million dollars per year. Therefore, by using the new economizer, while increasing the efficiency of the boiler, significant energy savings are achieved. In this regard, the cost of fuel consumption is reduced and environmental pollutants are also significantly reduced.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"28 ","pages":"Article 101310"},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G.P. Vanitha , Koushik V. Prasad , Shakti Prakash Jena , Aman Shankhyan , B Sahana , K. Chandan
{"title":"Insight into the axisymmetric stagnation point flow of ternary nanoparticles with heat transfer across a stretchable flat surface and circular cylinder","authors":"G.P. Vanitha , Koushik V. Prasad , Shakti Prakash Jena , Aman Shankhyan , B Sahana , K. Chandan","doi":"10.1016/j.ijft.2025.101318","DOIUrl":"10.1016/j.ijft.2025.101318","url":null,"abstract":"<div><div>The present study investigates the radiative heat transmission in axisymmetric stagnation point flow of ternary nanofluid across the stretchable flat surface and circular cylinder. This analysis considers a base fluid of water suspended with three dissimilarly shaped nanoparticles: silver, multi-walled carbon nanotubes, and Graphene. To optimize thermal management systems and sophisticated cooling, it is crucial to investigate the axisymmetric stagnation point flow of ternary nanoparticles with heat transmission. Ternary nanoparticles improve heat transfer performance by increasing thermal conductivity. Designing high-performance materials and nanofluid applications is aided by understanding such flow behaviour. The mathematical model has been framed with all the above considerations resulting to the system of partial differential equations. These systems of equations are transformed into ordinary differential equations. The exact solutions are derived to the well-known particular solutions using permeable stretchable surface conditions. The flow characteristics and thermal performance of ternary nanoparticles are described by pertinent parameters and displayed through graphs. The outcomes of this investigation disclose that the enhancement in the heat transmission rate is achieved due to the collision of nanoparticles and the action of the cooled walls of both geometries due to suction.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"28 ","pages":"Article 101318"},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}