Article
Thermodynamics
H. B. Marulasiddeshi, Praveen Kumar Kanti, S. B. Prakash, S. N. Sridhara
Summary: This research investigates the thermohydraulic behavior and thermodynamic irreversibility rate of water-based Al2O3 and Al2O3 + CuO hybrid nanofluid in a circular copper tube under a constant heat flux. The study analyzes the thermophysical characteristics, Nusselt number, entropy generation number, and friction factor of the nanofluids at different concentrations and Reynolds numbers. The findings demonstrate the potential of Al2O3 + CuO hybrid nanofluids as alternative cooling fluids for thermal systems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Hong Gao
Summary: In this study, the heat pipe technology with CuO nanofluid was experimentally tested to inhibit coal spontaneous combustion. The results revealed the influence of CuO mass concentration on coal temperature distribution and heat extraction efficiency.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
M. E. Nakhchi, J. A. Esfahani
Summary: The turbulent characteristics and thermal enhancement of CuO-water nanofluids through heat exchangers with double V-cut twisted tapes were investigated numerically. The results showed that the modified twisted tapes with cuts led to strong turbulent kinetic energy and additional vortex flow, improving fluid mixing and heat transfer. A significant enhancement in heat transfer efficiency of about 14.5% was observed for the nanofluid with a volume fraction of phi=1.5%, reaching a maximum thermal performance of eta=1.99 at Re=5000.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Multidisciplinary
Muhammad Shoaib, Muhammad Asif Zahoor Raja, Muhammad Touseef Sabir, Muhammad Awais, Saeed Islam, Zahir Shah, Poom Kumam
Summary: This research investigates the heat and mass transfer phenomena of hybrid nanofluid in 3D radiative flow over a rotating disk. By constructing a mathematical flow model and solving it using computational strength, the study reveals the relationship between heat transfer rate, skin friction coefficient, and various physical constraints. The findings show that the rate of heat transfer is proportional to Brinkman number, magnetic effect, and concentration of nanoparticles, demonstrating the reliability and value of the solution methodology.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Engineering, Mechanical
Wenhao Cao, Arif Ullah Khan, S. Saleem, Hajar Abutuqayqah, Safdar Abbas
Summary: The convective heat transfer and fluid flow were studied in a rectangular chamber with corrugated heated rods, taking into account porous media, micropolar fluid, and inclined magnetic field effects. Finite element method was used to solve the fluid flow and heat transfer problems in the rectangular chamber. The results, presented using contour plots and line graphs, showed that increasing the Hartmann number led to higher heat transmission rates, while Lorentz forces resulted in a flattening of the velocity profile. Higher Nusselt numbers and velocity profiles were observed near the heated boundaries.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Thermodynamics
Roohollah Babaei Mahani, Amir Ahmadi, Hossein Mahdavi Hezaveh, Mohammad Sepehrirad, Pouyan Talebizadehsardari
Summary: This study investigated the impact of factors such as turbulators, hybrid nanofluid, and Reynolds number on heat transfer. The results showed significant enhancements in heat transfer rates, ranging from 79.49% to 97.5%, by changing the parameters under study.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Mingzheng Ye, Jianqiang Du, Jin Wang, Lei Chen, Petar Sabev Varbanov, Jiri Jaromir Klemes
Summary: In this paper, a combined structure of fan-shaped cavities and oval pin fins is designed for a rectangular microchannel heat sink. The effects of different structural parameters on the performance are investigated. The results show that the microchannel exhibits improved hydrothermal performance under the optimal parameter combination.
Article
Thermodynamics
Amin Shahsavar, Seyed Saman Alimohammadi, Ighball Baniasad Askari, Hafiz Muhammad Ali
Summary: The numerical investigation of force convection flow of non-Newtonian water/CMC-CuO NF in three wavy channels and a straight channel was conducted. The study found that the influence of Re and nanoparticle concentration phi on pressure drop, Nu, and global entropy generation rates differed. Increasing Re and decreasing phi resulted in higher Nu values for all four channels, with the sinusoidal channel having the highest Nu. The trapezoidal channel had the highest pressure drop and total global entropy generation rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Haneen M. Al-Ali, Naseer H. Hamza
Summary: The impact of variation of ribs' pitch distance in the case of laminar flow and forced convection heat transfer upon flow characteristics in a rectangular channel was investigated experimentally and numerically. The results showed a good correlation between the numerical and experimental study, with a maximum deviation of approximately 3%. The use of nano-particles in the base fluid was found to improve the heat transfer coefficient by up to 9.4% compared to pure water, while the average skin friction decreased with increasing Reynolds number. These findings suggest that extended surfaces with nano-fluids can significantly enhance heat transfer properties with minimal increase in friction, making them suitable for efficient heat exchanger devices.
EXPERIMENTAL HEAT TRANSFER
(2023)
Article
Thermodynamics
Sayantan Mukherjee, Vamshikrishna Poloju, Purna Chandra Mishra
Summary: This paper investigates the heat transport, exergy, economic, sustainability, and environmental impact of a ternary nanofluid applied in a circular conduit. The study shows that the ternary nanofluid has superior thermal conductivity and Nusselt number, which can improve energy and exergy efficiencies and reduce the harmful impact of energy loss on the environment.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mahdi Deymi-Dashtebayaz, Mahla Akhoundi, Amir Ebrahimi-Moghadam, Ahmad Arabkoohsar, Ali Jabari Moghadam, Mahmood Farzaneh-Gord
Summary: This work presents a comprehensive thermo-hydraulic parametric study and optimization of CuO/water nanofluid flow inside dimpled heat exchangers. The results show that among the decision parameters, the average flow temperature and the pitch ratio have the lowest and highest effect on entropy generation, respectively. The optimization process resulted in optimum values for Reynolds number, dimensionless average flow temperature, nanofluid concentration, and pitch ratio.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Multidisciplinary Sciences
Fatemeh Karami, Ali Akbar Abbasian Arani, Omid Ali Akbari, Farzad Pourfattah, Davood Toghraie
Summary: This study conducted numerical simulations to investigate the heat transfer performance of forced turbulent flow convection in a grooved cylinder. The results showed that the presence of grooves improved heat transfer. Deeper and closer grooves resulted in better heat transfer performance. The thermal performance was higher at lower Reynolds numbers.
Article
Thermodynamics
Mohammadreza Niknejadi, Masoud Afrand, Arash Karimipour, Amin Shahsavar, Amir Homayoon Meghdadi Isfahani
Summary: This experimental investigation focuses on analyzing the laminar forced convection of water-based nanofluid (NF) containing Fe3O4 nanoparticles inside a twisted tube. The study examines the impacts of NF concentration, Reynolds number, and twist pitch on the average Nusselt number, friction factor, and overall hydrothermal performance indicator. The results show that the overall hydrothermal performance of NF in the twisted tube is superior to that of water in the plain tube, with the best performance occurring at NF concentration of 2% and twist pitch of 10 mm.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Physics, Applied
Farhan Ahmed
Summary: The importance of Methanol is evident from its wide range of applications including fuel preparation, chemical production, food metabolism, and energy related applications. This research focuses on the numerical analysis of the impact of temperature-dependent viscosity on the flow and heat transfer of Methanol Iron oxide nanofluid in an annular sector duct. The effects of temperature-dependent viscosity, Fe3O4 nanoparticles' contribution, and geometrical configuration are studied and visually represented through velocity contours, isotherms, velocity and temperature profiles. The results show that increasing the friction factor and average Nusselt number suppresses the velocity and temperature profiles.
MODERN PHYSICS LETTERS B
(2023)
Article
Chemistry, Inorganic & Nuclear
Angadi Basettappa Vishalakshi, Rudraiah Mahesh, Ulavathi Shettar Mahabaleshwar, Alaka Krishna Rao, Laura M. Perez, David Laroze
Summary: The study focuses on the inclined magnetohydrodynamics (MHD) mixed convective incompressible flow of a fluid with hybrid nanoparticles. Al2O3-Cu/H2O hybrid nanofluid is used to enhance the heat transfer analysis. The impact of radiation is also considered. The research methodology includes transforming the provided equations into non-dimensional form and obtaining ordinary differential equations (ODEs). The solutions of momentum and transfer equations are then used to solve the ODEs and obtain the root of the equation. The main significance lies in explaining mixed convective fluid flow through an analytical method.