Article
Thermodynamics
Naeem Lllah, Sohail Nadeem, Luthais McCash, Anber Saleem, Alibek Issakhov
Summary: This paper focuses on the natural convective flow analysis of micropolar nanofluid in a vertical container, using mathematical models and finite volume method. The results show that higher Rayleigh parameters lead to increased variations in flow characteristics and temperature fields, while higher viscosity coefficients result in decreased flow and thermal transportation.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Materials Science, Multidisciplinary
Sameh E. Ahmed, Aissa Abderrahmane, As'ad Alizadeh, Maria Jade Catalan Opulencia, Obai Younis, Raad Z. Homod, Kamel Guedri, Hussein Zekri, Davood Toghraie
Summary: This study quantitatively investigates the magnetohydrodynamic (MHD) mixed convection in a three-dimensional (3D) lid-driven cavity loaded with a power-law nanofluid using the Galerkin Finite Element Method (GFEM). The findings demonstrate the influence of various parameters on flow, heat transfer, and entropy generation.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Mathematics, Applied
M. Ijaz Khan, Sumaira Qayyum, Yu-Ming Chu, Seifedine Kadry
Summary: This article considers the Marangoni convective flow of nanofluid and entropy generation minimization. Equations are constructed for the Buongiorno model of nanofluid and the flow is generated by a rotating disk. The effects of activation energy, nonlinear mixed convection, and MHD are also taken into consideration. Ordinary differential equations are formed using appropriate variables and results are obtained using the Shooting method. The results of temperature, axial velocity, entropy, radial velocity, concentration, and Bejan number are discussed through graphs.
NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS
(2023)
Article
Physics, Multidisciplinary
Zehba A. S. Raizah, Ammar I. Alsabery, Abdelraheem M. Aly, Ishak Hashim
Summary: The study examined the flow and heat transfer fields of a nanofluid within a horizontal annulus partly saturated with a porous region using the Galerkin weighted residual finite element technique scheme. Factors such as Darcy number, porosity, and nanoparticle volume fractions were found to impact the streamlines, isotherms, and isentropic distribution. The study also revealed that the stream function value increases with the Darcy parameter and porosity but decreases with the growing porous region's area, while the Bejan number and average temperature decrease with an increase in Darcy number, porosity, and nanoparticle volume fractions.
Article
Mathematics, Applied
M. D. Alsulami, R. Naveen Kumar, R. J. Punith Gowda, B. C. Prasannakumara
Summary: The study investigates the heat transport properties under the lack of local thermal equilibrium conditions using a simplified mathematical model. The results suggest that the LTNE model yields two distinct primary thermal gradients between the fluid phase and the solid phase. The impact of different parameters on the velocity and thermal performance of non-Newtonian fluid flow containing Ti6Al4V and AA7075 nanoparticles in a porous media with magnetic effect is discussed.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Physics, Multidisciplinary
S. Parthiban, V. Ramachandra Prasad
Summary: This article investigates the flow of incompressible magnetohydrodynamic hybrid nanofluid through a heated enclosure containing a non-Darcy porous medium. The study examines the influence of various parameters on temperature contours, streamlines, and Nusselt number distributions. The results reveal a linear relationship between Rayleigh number and Nusselt number, as well as the influence of Hartmann number on local Nusselt number trends.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Multidisciplinary Sciences
Navid Alipour, Bahram Jafari, Kh. Hosseinzadeh
Summary: To address the challenge of thermal performance and heat loss in energy conversion systems, this study simulated a trapezoidal cavity with a wavy top wall containing water/ethylene glycol GO-Al2O3 nanofluid using the Galerkin finite element method. The effects of physical parameters, such as porosity, thermal radiation, magnetic field angle, Rayleigh number, and Hartmann number, on thermal performance and fluid flow were investigated. The optimized values for these parameters were determined to be 1214.46, 2.86, 0.63, 0.24, and 59.35, respectively. By applying RSM and Taguchi integration, the highest average Nusselt number of 3.07 was achieved, indicating improved thermal performance.
SCIENTIFIC REPORTS
(2023)
Article
Mechanics
Dipak Kumar Mandal, Nirmalendu Biswas, Nirmal K. Manna, Dilip Kumar Gayen, Rama Subba Reddy Gorla, Ali J. Chamkha
Summary: In this work, the numerical exploration of thermofluidic transport process in an M-shaped enclosure filled with permeable material and suspended with Al2O3-Cu hybrid nanoparticles is conducted. The impact of geometric parameters on thermal performance is analyzed, and an artificial neural network technique is implemented for prediction. The results reveal the importance of sidewall inclination and top triangular undulation in modulating thermo-flow physics.
Article
Multidisciplinary Sciences
Zehba Raizah, Abdelraheem M. Aly, Noura Alsedais, Mohamed Ahmed Mansour
Summary: The study investigates the effects of magnetic fields on mixed convection flow within an undulating cavity filled with hybrid nanofluids and porous media. Numerical simulations show that the length and position of the heater significantly impact the movement and heat transfer of nanofluids within the wavy cavity. Changes in heat generation coefficient and thermal radiation parameter affect the isotherms of the solid phase under different parameters.
SCIENTIFIC REPORTS
(2021)
Article
Computer Science, Interdisciplinary Applications
Tahar Tayebi, Ali J. Chamkha, Hakan F. Oztop, Lynda Bouzeroura
Summary: This study conducted a comprehensive numerical analysis of the local thermal non-equilibrium effects in a horizontal elliptical porous annulus saturated with nanofluid using finite volume technique. The results indicated that different porous medium properties can influence the local thermal non-equilibrium effects.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2022)
Article
Physics, Multidisciplinary
Dipak Kumar Mandal, Nirmalendu Biswas, Nirmal K. Manna, Rama Subba Reddy Gorla, Ali J. Chamkha
Summary: This study investigates the hydrothermal characteristics of an Al2O3-Cu-H2O hybrid nanofluid saturated in a non-Darcian porous complex wavy enclosure under a uniform magnetic field. Numerical simulations show that increasing the amplitude of the undulation enhances heat transfer, but does not always promote the growth of flow strength. Flow intensity and heat transfer increase with the modified-Rayleigh number, while they decrease with the Darcy number and Hartmann number. The local distribution of heat transfer characteristics exhibits complex behavior depending on the amplitude of the undulations and dimensionless numbers.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2022)
Article
Chemistry, Multidisciplinary
Nidal Abu-Libdeh, Fares Redouane, Abderrahmane Aissa, Fateh Mebarek-Oudina, Ahmad Almuhtady, Wasim Jamshed, Wael Al-Kouz
Summary: This study examines the behavior of a new cavity form filled with Ag/MgO/H2O nanofluids and porous media under a constant magnetic field, finding that an increase in the Hartmann number limits the heat transfer rate, making the magnetic field an excellent heat transfer controller.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Nima Shirani, Davood Toghraie
Summary: The study investigates mixed convection of nanofluid in a 2D square enclosure with a porous block and four rotating cylinders forced by a simple harmonic function. Results show that decreasing Darcy number and Richardson number increases average Nusselt number, while changes in porosity do not decisively affect heat transfer. Maximizing volume fraction of copper nanoparticles enhances heat transfer. Additionally, high permeability of the porous medium intensifies the impact of harmonic rotation of the cylinders on flow patterns.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Nadeem Abbas, Wasfi Shatanawi, Taqi A. M. Shatnawi
Summary: The main objective of this work is to investigate the steady incompressible second-grade micropolar fluid flow over a nonlinear vertical stretching Riga sheet. Slip velocity, zero mass flux, Lorentz forces, thermophoresis, Brownian motion, heat generation, and buoyancy forces are considered in the mathematical model. The model is solved numerically to analyze the variations in the movement, thermal distribution, and concentration distribution of the nanofluid. The results show different profiles and distributions for injection and suction cases, which are validated with existing literature.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Review
Green & Sustainable Science & Technology
Ammar I. Alsabery, Ali S. Abosinnee, Saleem K. Al-Hadraawy, Muneer A. Ismael, Mehdi A. Fteiti, Ishak Hashim, Mikhail Sheremet, Mohammad Ghalambaz, Ali J. Chamkha
Summary: This comprehensive review discusses the implementation of inner bodies in cavities filled with regular and nanofluids, focusing on both natural and mixed convection modes. The study of nanofluid gained importance in the heat transfer field about two decades ago, with experimental studies establishing correlations between nanoparticle specifications and thermo-physical properties. However, most theoretical investigations have focused on the use of nanoparticles in various geometrical conduits and enclosures. The review analyzes the implementation of nanofluid in cavities involving inner bodies using single and two-phase models, highlighting the limitations of the latter due to higher costs and lower utilization by researchers.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Energy & Fuels
Xiuli Liu, Hua Chen, Xiaolin Wang, Gholamreza Kefayati
Article
Thermodynamics
Hamidreza Mozayeni, Xiaolin Wang, Michael Negnevitsky, Gholamreza Kefayati
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Amin Shahsavar, Prabhakar Jha, Muslum Arici, Gholamreza Kefayati
Summary: The study experimentally investigated the effects of nanofluid water/magnetite and flow channel arrangement on photovoltaic thermal systems, finding that the PVT-8S system provided the most efficient configuration. Additionally, adding cooling systems significantly increased electrical efficiency for the PVT systems.
Article
Mechanics
Gholamreza Kefayati, Ali Tolooiyan, Andrew P. Bassom, Kambiz Vafai
Summary: This study introduces a mesoscopic method based on the lattice Boltzmann method for investigating the behavior of non-Newtonian fluids in porous media. By modeling power-law fluids in different REV models of porous media, a general mesoscopic model for both two- and three-dimensional cases was developed, and successfully used to simulate natural convection and double-diffusive natural convection in porous media.
Review
Energy & Fuels
Lanbo Lai, Xiaolin Wang, Gholamreza Kefayati, Eric Hu
Summary: Evaporative cooling technology has been considered as an alternative to conventional vapor-compression air conditioning for dry climates due to its simple structure and low operating cost. It includes direct evaporative cooling and indirect evaporative cooling, with the ability to lower air temperature to outdoor wet-bulb temperature. When integrated with solid desiccant systems, ECT can be suitable for a wider range of weather conditions, offering potential as a replacement for traditional cooling systems in hot and humid environments.
Article
Mechanics
Gholamreza Kefayati, Andrew P. Bassom
Summary: Nanofluids are used in various industries to improve heat transfer, and their modeling and simulation are continuously evolving. This study introduces a lattice Boltzmann method for simulating both Newtonian and non-Newtonian nanofluids, with the potential to incorporate any format of extra tensor directly. The method is suitable for studying non-Newtonian nanofluids and has been validated against benchmark problems involving both types of fluids.
Article
Mechanics
Gholamreza Kefayati
Summary: A mesoscopic method based on lattice Boltzmann method is introduced to simulate Newtonian and non-Newtonian nanofluids. The model is improved by considering various parameters, and the code is validated with previous studies. The results show good agreement and demonstrate the effectiveness of the proposed method.
Article
Construction & Building Technology
Lanbo Lai, Xiaolin Wang, Gholamreza Kefayati, Eric Hu
Summary: This paper proposes a solar-assisted solid desiccant cooling system integrated with M-cycle IEC, which has the best cooling performance in hot and humid areas. By adjusting the recirculation air ratio, the system can achieve a reduction in supply air temperature and humidity ratio, but it also increases the water consumption rate.
ENERGY AND BUILDINGS
(2022)
Article
Mathematics, Applied
Shiyin Sha, Ashley P. Dyson, Gholamreza Kefayati, Ali Tolooiyan
Summary: Debris flow events have catastrophic consequences for the environment, infrastructure, and human life. Mitigation of these events requires the use of barriers placed strategically to impede flow. However, the benefits of different numerical methods for debris flow modeling and barrier analysis are unclear.
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2023)
Article
Engineering, Mechanical
Qian Jiang, Feng Ren, Chenglei Wang, Zhaokun Wang, Gholamreza Kefayati, Sasa Kenjeres, Kambiz Vafai, Yang Liu, Hui Tang
Summary: In this study, a computational framework combining the lattice-Boltzmann method (LBM) and the particle-swarm optimization (PSO) algorithm was developed to find optimal strategies for magnetic nanoparticle (MNP) injection in hyperthermia-based cancer treatment. The results showed that multi-site injection strategies performed better than single-site injection strategies, and the more injection sites, the better the performance. The assessment of thermal dose considering both temperature and heat exposure time also indicated that the optimal multi-site injection strategies worked well for both tumor models.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mechanics
Gholamreza Kefayati, Ali Tolooiyan, Ashley P. Dyson
Summary: In this study, a finite difference lattice Boltzmann method (FDLBM) was introduced for simulating one-dimensional mud and debris flows. The proposed FDLBM recovers the generalized equations for mud and debris flows, including the effects of non-Newtonian behavior, contraction-expansion losses, wind force, various geometries, and lateral inflow or outflow. The method was validated against previous studies and successfully applied to various benchmark cases. It also provided accurate results for the investigation of the Anhui debris dam failure flood.
Article
Mechanics
Gholamreza Kefayati
Summary: Thermal convection driven by an internal heat source in a two-dimensional enclosure filled with viscoplastic fluids is studied numerically. The effects of the Rayleigh-Roberts number, the Prandtl number, the aspect ratio of the cavity, and the inclined angle of the enclosure on the flow characteristics are investigated. The results show that the maximum yield number is independent of the Rayleigh-Roberts and Prandtl numbers, but decreases with the increase in the inclined angle and increases with the increase in the aspect ratio.
Article
Mechanics
Gholamreza Kefayati
Summary: This article presents an updated macroscopic model of nanofluids, taking into account the local thermal non-equilibrium condition. A new relation for the thermal conductivity of solid and liquid phases is introduced, and a mesoscopic scheme based on the lattice Boltzmann method is derived. The accuracy of the method is verified through simulations of natural convection, and the results demonstrate the improved performance of the proposed thermal conductivity model compared to previous approaches.
Article
Engineering, Chemical
Lanbo Lai, Xiaolin Wang, Gholamreza Kefayati, Eric Hu
Summary: A new configuration of a solid desiccant evaporative cooling system integrated with a humidification-dehumidification desalination unit was proposed and its performance was evaluated. Two operation modes were proposed depending on climate conditions, and the system was evaluated under various operating conditions. The findings indicated that the proposed system had good potential for producing freshwater and cooling simultaneously.
Article
Engineering, Chemical
Lanbo Lai, Xiaolin Wang, Gholamreza Kefayati, Eric Hu
Summary: In this paper, the performance of a hybrid system combining a solid desiccant-based M-cycle cooling system with a humidification-dehumidification desalination unit was analyzed and compared in three modes. The recirculation mode showed better cooling performance, producing up to 7.91 kW of cooling load and maintaining a low air temperature and humidity under various conditions. All three modes had similar water production rates, but the recirculation mode had a higher coefficient of performance. However, this mode also had higher water consumption.
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
