Article
Thermodynamics
K. S. Bibin, J. S. Jayakumar
Summary: This study reports on the investigation of boiling in a square channel with partial filling of porous medium and analyzes the influence of parameters such as porosity and extent of filling on heat transfer and pressure drop. A new solver based on OpenFOAM is developed to study the problem. The results show that adding porous medium increases fluid temperature, heat transfer, and vapor generation rate. Heat transfer also increases with decreasing porosity for a certain ratio of porous medium thickness to channel height. However, the increase in heat transfer is not significant when the ratio is below a certain value. Furthermore, an increase in thickness and a decrease in porosity lead to an increase in pressure drop. Additionally, the maximum Nusselt number for two-phase heat transfer is approximately 4.8 times higher than that for single-phase heat transfer in the same channel.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Noureddine Hadidi, Redha Rebhi, Rachid Bennacer, Younes Menni, Houari Ameur, Giulio Lorenzini, Khaled A. Gepreel, Hijaz Ahmad
Summary: This study numerically examined natural convection with double diffusion in a tilted square cavity, discussing the effects of various parameters on thermo-solutal natural convection and the rate of mass and thermal exchange. The results showed complex flow structures affecting local transfers such as Nusselt and Sherwood numbers.
RESULTS IN PHYSICS
(2021)
Article
Thermodynamics
C. Y. Wang
Summary: The study focuses on forced flow due to a pressure gradient in a rotating channel filled with an anisotropic porous medium, with key factors being rotation rate and lateral permeabilities. The primary fluid velocity component is in the direction of the pressure gradient, while the secondary component is transverse due to Coriolis forces. The criterion for convex velocity profiles is based on the difference between lateral permeabilities.
JOURNAL OF POROUS MEDIA
(2022)
Article
Thermodynamics
Qahtan Al-Aabidy, Ahmed Alhusseny, Nabeel Al-zurfi
Summary: This paper investigates the impact of inserting a porous layer inside a wavy channel on flow characteristics using numerical simulations. The results show that a decrease in permeability leads to the occurrence of a repeated flow pattern in the upstream region.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Debayan Bhowmick, Pitambar R. Randive, Sukumar Pati
Summary: The study indicates that introducing a corrugated wall in a partially filled porous channel can enhance the mixing capability between hot and cold fluids, leading to an increase in heat transfer rate. Among the sinusoidal, triangular, and trapezoidal corrugated channels, the trapezoidal one shows better heat transfer enhancement. The performance factor is strongly dependent on both the Reynolds number and the profile of the corrugated channel.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Multidisciplinary Sciences
Yu-Pei Lv, Naila Shaheen, Muhammad Ramzan, M. Mursaleen, Kottakkaran Sooppy Nisar, M. Y. Malik
Summary: This study examines nanoliquid flow between two horizontal infinite plates, considering various influencing factors and parameters. The numerical solution reveals changes in temperature behavior and concentration profile as certain parameters increase.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Xiangcheng You
Summary: This study investigates the nanoparticle sphericity of Cu-Al2O3-H2O hybrid nanofluid flows in porous medium-filling inclined channels. It provides analytical solutions for the velocity and temperature fields, considering various parameters such as mixed convection variable, Peclet number, channel tilt angle, and nanoparticle sphericity and volume fractions. The findings show that the effective thermal conductivity increases with increasing temperature for the same nanoparticle volume fractions. Nanoparticles with smaller average sphericity size have a greater specific surface area and enhance internal heat transfer. Additionally, increasing nanoparticle volume fraction leads to a slower but still significant enhancement of heat transfer.
Article
Thermodynamics
Mirza Farrukh Baig, Gooi Mee Chen, Chih Ping Tso
Summary: This study investigates forced convection heat transfer in a channel partially filled with a porous medium, considering viscous dissipation under local thermal nonequilibrium conditions, and highlights the importance of incorporating viscous dissipation effects to the temperature field.
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2022)
Article
Nanoscience & Nanotechnology
Sneha Jaiswal, Pramod Kumar Yadav
Summary: This study focuses on the Couette flow of micropolar fluid in a rotating annulus region filled with porous medium, comparing the motion of micropolar fluid under spin and no-spin conditions, with implications for engineering applications.
MICROFLUIDICS AND NANOFLUIDICS
(2022)
Article
Thermodynamics
Min Chan Kim, Kwang Ho Song
Summary: In this study, the effect of co-injection of CO2 and impurities on buoyancy-driven convection in carbon capture and geological sequestration is investigated. Theoretical and numerical analyses reveal the impact of double diffusion on the onset and growth of convection, providing insights into scaling relations that can be used as control parameters. The findings suggest a new scaling relation based on the temporal change of density gradient in the double diffusive and extended double diffusive convection regimes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
A. Benerji Babu, Devarapu Anilkumar, N. Venkata Koteswara Rao
Summary: This paper discusses the analytical study of linear and weakly nonlinear stability of thermohaline convection in a sparsely packed porous medium due to rotation. The critical Rayleigh number and the stability regions are obtained through linear stability analysis and weakly nonlinear analysis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Km Renu, Ashok Kumar, Abhishek K. Sharma
Summary: The study investigated the stably stratified flow in a linearly heated vertical pipe filled with a fluid-saturated porous medium, with a focus on the impact of permeability and Prandtl number on the stability of basic flow at different disturbance modes. The results demonstrate that the least stable mode depends on the values of Pr and Da, with a small range of Pr exhibiting a change in destabilizing characteristics to stabilizing characteristics for certain Da values.
Article
Mathematics
Sunghoon Kim, Ki-Ahm Lee
Summary: The study investigates the evolution of population density vector of k-species controlled by the absolute value |u|, and the properties and asymptotic behavior of the degenerate parabolic system. By proving the convergence of population densities and establishing a suitable Harnack type inequality, the spatial behavior of population densities is revealed in different approaches. The study also identifies 1-directional travelling wave solutions and properties of solutions exhibiting travelling wave behavior at infinity.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2021)
Article
Mechanics
Mebin Abraham Cherian, Sukhendu Ghosh, Sudipto Mukhopadhyay
Summary: This study investigates the instability and transport phenomena in a pressure-induced fluid flow through a spanwise rotating channel filled with an isotropic porous material. The analysis reveals that the rotating porous media flow has a lower instability Reynolds number and can enhance mixing and transport.
Article
Thermodynamics
Abiodun O. Ajibade, Basant K. Jha, Jeremiah J. Gambo
Summary: This study investigates the combined influence of thermal dissipation and Darcy dissipation on the steady motion of a fully developed mixed convection flow through a vertical composite channel partially filled with porous material. The results show that increasing the Brinkmann number increases the temperature and velocity profiles, while increasing the thickness of the porous medium increases the pressure gradient and increasing the porosity reduces the pressure gradient within the composite channels.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
