Article
Thermodynamics
Vijayalakshmi Yerramalle, B. Premachandran, Prabal Talukdar
Summary: Numerical examination was conducted on mixed convection in a horizontal channel with a single heat source and a porous insert. The study found that buoyancy force plays a significant role at low Reynolds numbers and should not be ignored. Applying the local thermal non-equilibrium condition can help determine the optimal thickness of the porous insert for improved heat transfer efficiency.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Oktay cicek, A. Cihat Baytas
Summary: This study investigates the confined single-walled carbon nanotube-water nanofluid jet impingement heating of a cooled surface with a uniform heat flux in the presence of a porous layer. The analysis considers the buoyancy force effect under local thermal non-equilibrium conditions. The study finds that increasing Reynolds, Darcy, and Grashof numbers lead to a local variation of temperature along the upper wall, and identifies optimum values of thermal conductivity ratio and porous layer thickness for better heating on the upper wall.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Mechanics
Victoria Hamtiaux, Miltiadis V. Papalexandris
Summary: In this study, turbulent thermal convection in mixed porous-pure fluid domains is investigated using direct numerical simulation. The effects of different sizes of the porous medium and heat loading variations on the convective structures and flow patterns are analyzed. Results for flow statistics, Nusselt number, and temperature variations are presented, showing that the large-scale circulation above the porous medium can exhibit single-roll, dual-roll, or intermediate states depending on the area coverage.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Thermodynamics
Bernardo Buonomo, Furio Cascetta, Oronzio Manca, Mikhail Sheremet
Summary: In this study, an analytical solution was derived for a porous fin with natural convection and radiation heat transfer using the Local Thermal Non-Equilibrium model. The results showed that as the Biot and Rayleigh numbers decrease, the solid phase temperature decreases and the difference between solid and fluid phase temperatures reduces. Additionally, an increase in thermal conductivity ratio and dimensionless thickness results in higher solid phase temperatures.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Prabir Barman, Pentyala Srinivasa Rao
Summary: This study investigates numerical heat transfer and fluid flow in a Darcy porous enclosure. A constant low temperature is maintained on the right wavy wall, while the top and bottom are thermally insulated and the left vertical wall is uniformly heated. The governing equations for non-dimensional systems are solved using the Galerkin finite element method, revealing a local thermal non-equilibrium. The effects of various parameters including interface heat transfer, porosity of porous media, Rayleigh-Darcy number, and waviness of cavities on heat transfer enhancement are examined.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Thermodynamics
Lei Wang, Changsheng Huang, Junjie Hu, Baochang Shi, Zhenhua Chai
Summary: In this study, the influences of exponentially temperature-dependent viscosity on free convection in a porous cavity with a circular cylinder under local thermal non-equilibrium condition are numerically investigated using lattice Boltzmann method. The results show that an increase in LTNE parameters leads to a dramatic increase in solid heat transfer rate, while higher values of n result in decreased heat transfer rates for both fluid and solid phases.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Gazy F. Al-Sumaily, Hasanen M. Hussen, Miqdam T. Chaichan, Hayder A. Dhahad, Mark C. Thompson
Summary: This study investigates the effects of sphere diameter and porosity on natural convection heat transfer inside an eccentric annulus packed with stationary spheres. Different sphere sizes, porosities, and sphere materials are considered, and the results show that the effects of these parameters depend strongly on the thermal conductivity of the spheres material. It was found that at lower thermal conductivity ratio, the bigger sphere size or the larger porosity produces higher convection heat transfer, while at higher thermal conductivity ratio, the increase in sphere size or porosity causes a decrease in convection heat transfer.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Engineering, Multidisciplinary
Noura Alsedais, Abdelraheem M. Aly, Mohamed Ahmed Mansour
Summary: This paper examines the magnetic impacts on the mixed convection of a nanofluid contained by an undulating porous cavity with the help of radiative and heat generation. The study considers the condition of local thermal non-equilibrium (LTNE) and uses the finite volume method (FVM) to solve the governing equations. The results indicate that the growth in nanoparticles parameter enhances the average Nu profiles of the fluid phase, and the heat transfer is influenced by the variations in the length/position of the heater source.
AIN SHAMS ENGINEERING JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Hyoung Suk Suh, WaiChing Sun
Summary: This paper introduces a mathematical framework and an asynchronous finite element solver for capturing brittle fractures in multi-phase fluid-infiltrating porous media at the mesoscale. It presents a dual-temperature effective medium theory and proposes an asynchronous time integrator to handle different growth rates of boundary layers effectively.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Chemical
Yang Liu, Yangbo Deng, Junrui Shi, Rujie Xiao, Houping Li
Summary: A simplified two-dimensional model of a two-layer porous burner based on pore level was developed, showing that flame structure is highly two-dimensional and obvious thermal non-equilibrium exists in the burner. The study also revealed that thermal non-equilibrium in the porous burner is greatly affected by the inlet velocity and solid thermal conductivity.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Thermodynamics
Prashant Singh
Summary: This paper presents an experimental investigation on the primary and secondary peak heat transfer characteristics of an obliquely (45 degrees) impinging jet on a flat and smooth target surface. The effects of jet Reynolds number (Re) and jet-to-target spacings (z/d) have been studied, and the results reveal the dependence of the primary and secondary peak location and heat transfer level on Re and z/d in oblique jet impingement. The comparison with 90 degrees (orthogonal) jet impingement shows that the primary and secondary peaks are sharper and have higher heat transfer levels in the 45 degrees impingement case.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Review
Thermodynamics
Sukumar Pati, Abhijit Borah, Manash Protim Boruah, Pitambar R. Randive
Summary: This paper provides a comprehensive review of the use of porous media in thermal systems, discussing the effects of different modelling approaches on heat transfer and entropy generation, and critically evaluates the applicability of LTE and LTNE methods.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Oktay Cicek, A. Filiz Baytas, A. Cihat Baytas
Summary: This study investigates the entropy generation minimization and mixed convective heat transfer of multi-walled carbon nanotubes-Fe3O4/water hybrid nanofluid flow in a lid-driven square enclosure with heat generation and a porous layer on inner surfaces. The study considers the local thermal non-equilibrium approach and the non-Darcy flow model. The results show that the direction of forced and free convection flow has a significant effect on entropy generation and average Nusselt numbers.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Multidisciplinary Sciences
Suma Shyabal, B. N. Hanumagowda, M. Ravisha, A. L. Mamatha, N. Shivaraju, D. O. Soumya, Shalan Alkarni, Nehad Ali Shah
Summary: This study investigates the linear stability and controllability of thermal convection in a liquid-saturated, porous layer using the local thermal nonequilibrium conditions. Numerical computations and model analysis are conducted to examine the influence of different non-uniform thermal gradients on the onset of porous convection.
Article
Thermodynamics
Jun-Suk Youn, Won-Woo Choi, Sung-Min Kim
Summary: The study primarily investigated the heat transfer characteristics of jet array impingement with effusion holes and aimed to provide basic data for the design of a gas-turbine casing cooling system. The three-dimensional numerical unit cell model was constructed and validated for a wide range of geometric parameters using previous experimental data. An assessment was made on the accuracy of previous Nusselt number correlations for a jet array impingement, and a new correlation was proposed for predicting the average Nusselt number for a jet array impingement with effusion holes.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Raed Abed Mahdi, H. A. Mohammed, K. M. Munisamy, N. H. Saeid
CHEMICAL ENGINEERING COMMUNICATIONS
(2015)
Article
Thermodynamics
Kok-Cheong Wong, Jian-Hong Lee
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2015)
Article
Thermodynamics
Kok-Cheong Wong, Jen-Haw Chong
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2015)
Article
Thermodynamics
Nawaf H. Saeid
JOURNAL OF POROUS MEDIA
(2015)
Review
Green & Sustainable Science & Technology
Raed Abed Mandi, H. A. Mohammed, K. M. Munisamy, N. H. Saeid
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2015)
Article
Thermodynamics
Nawaf H. Saeid
HEAT TRANSFER ENGINEERING
(2018)
Article
Thermodynamics
Kok-Cheong Wong, Mao-Lin Ang
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2017)
Article
Thermodynamics
Nawaf H. Saeid, Nurul Hasan, Mohamed Hairol Bin Hj Mohd Ali
JOURNAL OF POROUS MEDIA
(2018)
Review
Materials Science, Multidisciplinary
Wee King Law, Kok-Cheong Wong, Haoliang Wang, Zhenzhong Sun, Chin Seong Lim
Summary: Advancements in metal additive manufacturing (AM) over the past decade have opened up new possibilities in various industries, with the injection molding industry now implementing metal AM technologies to 3D print steel molds. The main challenge faced by mold makers is to achieve mechanical properties in 3D printed steel molds comparable to traditionally made ones. Research on microstructure evolution in 3D printed steel molds provides crucial information for tailoring the mold's microstructure and enhancing its mechanical properties.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Thermodynamics
Nawaf H. Saeid
Summary: This study conducted a numerical investigation on the conjugate heat transfer and generated thermal stresses of jet impingement cooling of a solid block. Results showed variations in the average Biot number for different materials and an increase in equivalent stresses by increasing the Reynolds number, thickness of the block, or heated surface temperature. Additionally, the Polyethylene block exhibited the maximum total deformation while the Titanium Alloy block showed the minimum total deformation.
HEAT TRANSFER ENGINEERING
(2023)
Article
Engineering, Mechanical
N. H. Saeid, N. Hasan, Seri Rahayu Ya'akub, S. Shuib
Summary: A parametric study was conducted on the transient cooling process of two circular cylinders in tandem arrangement, investigating the effects of various parameters on heat dissipation. The results showed that increasing the separation distance and/or Reynolds number can enhance heat dissipation and reduce cooling time.
JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES
(2021)
Article
Mathematics, Interdisciplinary Applications
Hao Huang, Hongcheng Wang, Manna Chen, Chin Seong Lim, Kok-Cheong Wong
Summary: The Lee-Huang-Yang (LHY) correction to the mean field dynamics, originating from quantum fluctuations, is used to study binary quantum droplets in free space. Different types of quantum droplets, including semi-vortex and binary vortex droplets, are studied and their stability and characteristics are analyzed.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Energy & Fuels
Nurafiqah Abdullah, Nurul Hasan, Nawaf Saeid, Mysara Eissa Mohyaldinn, El-Said Mamdouh Mahmoud Zahran
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2020)
Article
Engineering, Mechanical
N. H. Saeid, B. S. Busahmin, A. A. Khalid
JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES
(2019)
Article
Engineering, Mechanical
N. H. Saeid
JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES
(2018)
Article
Thermodynamics
Yunxia Ma, Fei Liu, Honggang Pan, Hongjian Zhang, Shuxia Yan, Ailing Zhang
Summary: This paper proposes a dynamically tunable and switchable perfect infrared absorber that exhibits excellent electrical regulation performance and high absorptance. The absorption mechanism is explained using a multiple interference model, and it is proven to be polarization insensitive.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
F. J. dos Santos, G. S. M. Martins, M. Strobel, L. Beckedorff, K. V. de Paiva, J. L. G. Oliveira
Summary: This study investigates the effects of inlet conditions and plate's features on the thermal-flow performance of a gasket plate heat exchanger (GPHE) and assesses the impact of a modified tightening distance on its performance. No systematic study on the combined effects of inlet conditions and assembly accuracy on GPHE performance has been conducted before.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Alok K. Ray, Dibakar Rakshit, K. Ravi Kumar, Hal Gurgenci
Summary: The low thermal conductivity of phase change materials limits the heat transfer rate and application of latent heat storage systems. This numerical study examines the impact of two passive heat transfer enhancement techniques on the thermal performance of a latent heat storage system. The results show that the orientation and position of the heat transfer fluid tube have significant effects on the charging duration, while the discharging duration remains unchanged. The combined effect of orientation and eccentricity reduces the charging duration, but increases the discharging duration compared to the concentric domain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yalu Han, Yanlong Wang, Chenyang Liu, Xinmin Hu, Yin An, Zhengcai Li, Jiaxun Jiang, Lizhi Du
Summary: This paper investigates the calculation method of thermal conductivity in NAPLs-contaminated soils. By establishing NAPLs-contaminated soil models and using the Lattice Boltzmann Method (LBM) for calculation, an optimized three-dimensional model with high computational accuracy and efficiency is obtained. The study also finds that saturation and Nz parameters have a significant impact on calculation time, while the thermal conductivity of the two-dimensional model is more sensitive to anisotropy. The influence of porosity and NAPLs content on thermal conductivity should be considered during in-situ thermal desorption.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Mostafa Taha, Song Zhao, Aymeric Lamorlette, Jean-Louis Consalvi, Pierre Boivin
Summary: For the first time, large-eddy simulations (LES) of the near-field region of large-scale fire plumes were performed using a pressure-based Lattice Boltzmann method (LBM) with low-Mach number approximation. The simulations showed quantitative agreement with experimental data and were consistent with previously-published numerical studies. The study demonstrated the computational efficiency of the proposed LBM solver in tackling fire-induced flows, suggesting LBMs as a good alternative candidate for modeling fire-related problems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weixin Zhang, Yehang Xie, Yuqiang Ding, Zhao Liu, Zhenping Feng
Summary: This study investigated the impact of upstream slot leakage on the endwall film cooling characteristics of turbine blades. Pressure Sensitive Paint (PSP) technology was used to measure the film cooling characteristics, and numerical analysis was conducted to evaluate the aerodynamic performance. It was found that increasing the mass flow ratio of the upstream slot enhanced film cooling, decreased aerodynamic losses, and reduced the strength of passage vortex. However, reducing the distance between the slot and the blade leading edge only enhanced film cooling without affecting the leakage coverage area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rui Zhang, Zhen-lei Li, Yan-sheng Zhang, Dong Chen, Guo Yuan
Summary: This study discusses the heat transfer behavior of different jet forms on steel tubes. The results show that the annular jet performs better in terms of cooling intensity and uniformity. The cooling performances of the two jet forms are similar when the steel tube size is small. Therefore, the planar jet can be considered for smaller diameters due to its simplicity, low cost, and convenience in application.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
A. R. Khoei, A. M. Orvati Movaffagh, A. Rezaei Sameti
Summary: This paper presents a comprehensive study on the thermo-mechanical characteristics of oxide-coated aluminum nano-powder. It is found that the thermal conductivity of oxide-coated aluminum nano-powder is significantly lower than that of the bulk aluminum, and it is affected by the density and temperature.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yanjin Wang, Jintao Xiong, Lingyu Chen, Zhihai Lv, Qian Wang
Summary: A solar radiation transfer model for spray cooling double skin facade (SC-DSF) is proposed in this study. The model is validated by experimental results and various influence factors are analyzed. The effectiveness of adjusting droplet coverage rate and size is also evaluated.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Bostjan Zajec, Blaz Mikuz, Anil Kumar Basavaraj, Marko Matkovic, Matej Tekavcic, Martin Draksler, Leon Cizelj, Bostjan Koncar
Summary: We have developed an advanced experimental setup to investigate flow and heat transfer in an annular channel. The setup allows heat transfer measurements and flow visualization using a temperature-controlled inner tube. Measurements can be conducted in both single-phase and two-phase flow regimes. The setup ensures a uniform velocity field in the annular channel using specially designed inlet and outlet headers. The inner copper tube is heated by water and contains turbulators for enhanced heat transfer and thermocouples for temperature measurement. A three-dimensional conjugate heat transfer CFD model has been developed and validated to accurately estimate heat losses in the setup. This study demonstrates the importance of numerical simulations in improving the interpretation of complex experimental results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weijie Chen, Ke Wang, Yongqing Wang, Shantung Tu, Zunchao Liu, Huijuan Su
Summary: In this study, a novel gradient porosity transpiration cooling plate structure (GP-TCPS) is proposed to alleviate heat transfer deterioration caused by non-uniform temperature distribution in transpiration cooling plate structure (TCPS). Computational fluid dynamics (CFD) and response surface method (RSM) were used for qualitative and quantitative analysis of the flow and heat transfer of GP-TCPS. The optimized structure of GP-TCPS significantly improves temperature uniformity, injection pressure, and average cooling efficiency compared to traditional TCPS.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
R. Essam, A. Elsaid, W. K. Zahra
Summary: This study presents a novel bioheat model for simulating heat transfer in skin tissue. The model offers an improved representation of thermal dynamics in the skin and has been validated using numerical solutions and experimental measurements. The study highlights the importance of incorporating vascular inlet parameters and thermal relaxation effects in the thermal profile, and suggests potential applications in thermal therapy and wound healing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Dongbo Shi, Tao Xu, Zifeng Chen, Di Zhang, Yonghui Xie
Summary: The cooling structure design of turbine blades is crucial for the safety and reliability of the gas turbine set. This research investigates different arrangement schemes, including dimple/protrusion arrangements, to enhance the cooling performance. The results show that the arrangement scheme with both passes arranged by dimples has the best comprehensive thermal performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Emrehan Guersoy, Hayati Kadir Pazarlioglu, Mehmet Guerdal, Engin Gedik, Kamil Arslan
Summary: The thermo-hydraulic performance of Al2O3/H2O nanofluid with different nanoparticle shapes flowing in a sudden expansion tube with variable sudden expansion inclination angles and elliptical dimpled fins with different diameters were numerically investigated. The results showed that the nanoparticle shapes, sudden expansion inclination angles, and elliptical dimpled fin have significant impact on the thermo-hydraulic performance. This study reveals the novelty and importance of these factors in the research.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rukun Hu, Xinyu Huang, Xinyu Gao, Liu Lu, Xiaohu Yang, Bengt Sund
Summary: This study examines the impact of applying bottom cross-cut on PCM's spatial distribution in a horizontal LHTES unit using numerical simulation. The findings show that bottom cross-cut can improve the heat storage rate and natural convection heat transfer gain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
