Article
Mechanics
Chris A. Jones, Krzysztof A. Mizerski, Mouloud Kessar
Summary: Anelastic convection at high Rayleigh number in a plane parallel layer with no-slip boundaries is studied, deriving energy and entropy balance equations to develop scaling laws for heat transport and Reynolds number. The appearance of an entropy structure allows for explicit forms of these scaling laws based on the Rayleigh number, Prandtl number, and temperature ratio. Different scaling laws are found depending on whether viscous dissipation primarily occurs in the boundary layers or in the bulk, with numerical simulations comparing theoretical predictions up to a Rayleigh number of 10^7.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Thermodynamics
Ubade Kemerli, Kamil Kahveci
Summary: Metal foams are promising for enhancing thermal performance in heat exchangers, but limited heat dissipation in high porosity foams is a constraint. Adding fins can significantly improve heat transfer, but the enhancement becomes limited beyond a certain number of fins. The contribution of fins to heat transfer varies between 40-115% and 70-150% at different velocities, depending on porosity and effective thermal conductivity.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Prakash H. Jadhav, N. Gnanasekaran, Moghtada Mobedi
Summary: This study explores the use of partially filled high porosity graded aluminum and copper foams to satisfy both heat transfer and pressure drop in a heat exchanger. Different configurations with positive and negative orientations are utilized to enhance heat transfer and reduce pressure drop. The results show that the decreasing graded foam achieves higher heat transfer rate and lower pumping power compared to the models without graded metal foam.
Article
Multidisciplinary Sciences
Meisam Babanezhad, Iman Behroyan, Azam Marjani, Saeed Shirazian
Summary: The study combined ACOFIS with CFD to predict pressure and temperature of Al2O3/water nanofluid flow, investigating the ACOFIS intelligence for different input numbers and pheromone effects. The results showed that ACOFIS could accurately predict the nanofluid pressure and temperature within a short processing time.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Xiangcheng You, Shiyuan Li
Summary: This study investigates the convective heat transfer of a hybrid nanofluid in an inclined channel through analytical methods. The results show that nanoparticle volume fractions play a key role in delaying the occurrence of flow reversal, with hybrid nanofluids having a longer delayed range compared to conventional nanofluids.
Article
Thermodynamics
A. Borrelli, G. Giantesio, M. C. Patria
Summary: This paper investigates the flow of a Bingham fluid in a vertical channel, considering the effects of an external magnetic field and natural convection. It is found that the velocity decreases with increasing Bingham and Hartmann numbers, and the presence of an external magnetic field increases the thickness of the plug region. The modulus of the induced magnetic field is not monotone with changes in the Hartmann number, but is a decreasing function of the Bingham number.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Zekeriya Parlak, Nezaket Parlak, Yasar Islamoglu
Summary: The optimization operation with ANSYS Response Surface Optimization Tool was used to find the best geometry for converging-diverging channels. The study focused on the effects of channel width, wavelength, and amplitude on thermal-hydraulic performance, with thermal performance factors calculated. Results showed that the optimized channel outperformed the straight channel, with TPF values ranging from 1.4 to 1.7 across different Reynolds numbers.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Hang Xu
Summary: This paper investigates mixed convection flow in an inclined microchannel driven by pressure gradient, buoyancy, and electrical double layer. Analytical solutions are provided for electrostatic potential, velocity, and temperature distribution, with discussions on the influences of physical parameters and the onset of flow reversal.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Astronomy & Astrophysics
Esteban Calzetta
Summary: A simple model was used to study nonlinear phenomena in a real relativistic fluid, focusing on new types of behavior without nonrelativistic equivalents, such as an entropy cascade driven by fluctuations in the theory's tensor degrees of freedom. The von Karman-Howarth equations for this kind of turbulence were derived, along with considerations of correlations corresponding to fully developed turbulence.
Article
Thermodynamics
Prakash H. Jadhav, G. Trilok, N. Gnanasekaran, Moghtada Mobedi
Summary: Optimization study of flow through metal foams for heat exchanging applications is crucial for improving heat transfer and reducing pressure drop. Different metal foam configurations were considered and TOPSIS optimization techniques were used to determine the best structure configuration. Experimental results showed that a 30PPI aluminum foam with 80% filling on the inner lateral of the pipe performed the best when air is used as the working fluid.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Altay Arbak, Mustafa Ozdemir, Nihad Dukhan
Summary: This study experimentally investigated the effect of pulsating inlet velocity condition on heat transfer in metal foam. The results showed that there was a strong relationship between average Nusselt number and flow velocity amplitude, with an increase in frequency parameter and/or amplitude parameter leading to an increase in average Nusselt number. Correlations for the local and surface Nusselt numbers were proposed, and a meaningful comparison between steady-state and pulsating heat transfer was provided.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Jordi Pallares, Alexandre Fabregat, Chengwang Lei
Summary: We conducted direct numerical simulations of fully developed turbulent natural convection flow in a vertical channel using Boussinesq fluid. One wall was heated with a constant heat flux, while the other wall was perfectly insulated. The simulations were performed at three different Rayleigh numbers and the results matched the experimental data. The study found that the shear stress is greater on the thermally active wall, but the turbulent intensity and shear stress are greater near the insulated wall. Similarly, the temperature fluctuations and turbulent heat fluxes are higher near the thermally active wall compared to the adiabatic wall.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Nihad Dukhan, Ali A. Hmad
Summary: The study investigates the cooling potential of open-cell aluminum foam for fuel cell stacks using airflow. A model based on a commercial 500-W proton exchange membrane fuel cell stack was simulated and experimentally tested. Results show good agreement between simulation and experiment for local temperatures, with the new cooling system successfully keeping the stack within the safe operating temperature range.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Review
Thermodynamics
Nihad Dukhan
Summary: This paper introduces the advantages of the combination of nanofluids and open-cell metal foam in heat exchange technology, and emphasizes the limited research on the combination of these two technologies. The paper includes the basic knowledge of nanofluids and open-cell metal foam, theoretical models of fluid heat transfer, recent research findings, and recommendations.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Computer Science, Interdisciplinary Applications
Jiaqi Zhao, Ming Zhang, Yu Zhu, Rong Cheng, Leijie Wang
Summary: This study introduces a novel three-layer thermofluid model for topology optimization of planar cooling channels. By introducing the porosity field to describe the channel's topology, optimized channels show competitive heat dissipation performance.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Thermodynamics
Nihad Dukhan, Ozer Bagci, Levent Ali Kavurmacioglu
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2015)
Article
Thermodynamics
Ozer Bagci, Nihad Dukhan, Mustafa Ozdemir, Levent Ali Kavurmacioglu
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2016)
Article
Engineering, Aerospace
Levent Ali Kavurmacioglu, Cem Berk Senel, Hidir Maral, Cengiz Camci
AEROSPACE SCIENCE AND TECHNOLOGY
(2018)
Article
Thermodynamics
C. B. Senel, H. Maral, L. A. Kavurmacioglu, C. Camci
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Engineering, Mechanical
Aydin Haci Donmez, Zehra Yumurtaci, Levent Kavurmacioglu
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2019)
Article
Engineering, Aerospace
Levent Kavurmacioglu, Hidir Maral, Cem Berk Senel, Cengiz Camci
INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING
(2018)
Article
Engineering, Aerospace
Chao Zhou, Howard Hodson
JOURNAL OF PROPULSION AND POWER
(2012)
Article
Thermodynamics
Baris Gumusel, Cengiz Camci
PROGRESS IN COMPUTATIONAL FLUID DYNAMICS
(2010)
Article
Engineering, Mechanical
H. Maral, C. B. Senel, K. Deveci, E. Alpman, L. Kavurmacioglu, Cengiz Camci
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2020)
Article
Thermodynamics
H. Maral, E. Alpman, L. Kavurmacioglu, Cengiz Camci
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
K. Deveci, H. Maral, C. B. Senel, E. Alpman, L. Kavurmacioglu, C. Camci
JOURNAL OF THERMAL ENGINEERING
(2018)
Article
Thermodynamics
Hidir Maral, Cem Berk Senel, Levent Ali Kavurmacioglu
ISI BILIMI VE TEKNIGI DERGISI-JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY
(2017)
Proceedings Paper
Engineering, Mechanical
H. Maral, C. B. Senel, L. Kavurmacioglu
PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2016, VOL 2B
(2016)
Article
Thermodynamics
Nihad Dukhan, Ozer Bagci, Mustafa Ozdemir, Levent Kavurmacioglu
JOURNAL OF THERMAL ENGINEERING
(2016)