Article
Thermodynamics
Asma Khalid, Abdul Hafeez, Amani Mubarak Mohammed Alfarhan
Summary: This study investigates the flow characteristics of hybrid nanofluids in porous media and the effects of melting temperature and slip velocity on the surface. By developing a mathematical model and using numerical methods, the velocity and temperature distributions of the hybrid nanofluids are obtained. The study finds that the heat transfer rate of the hybrid nanofluids is enhanced by the melting temperature, and factors such as magnetic field parameter and unsteadiness parameter have an impact on the flow characteristics.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mostafa Valizadeh Ardalan, Rasool Alizadeh, Abolfazi Fattahi, Navid Adelian Rasi, Mohammad Hossein Doranehgard, Nader Karimi
Summary: The study investigates the unsteady physics of laminar mixed convection in a lid-driven enclosure filled with Cu-water nanofluid. It finds that implementing a temporally sinusoidal velocity on the top wall reduces the required power while decreasing wall oscillation frequency increases heat transfer rate. Additionally, lowering Richardson number and increasing volume fraction of nanoparticles enhance heat transfer rate.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Materials Science, Multidisciplinary
Naeem Faraz, Muhammad Shemyal Nisar, Yasir Khan, Anwar Hussain, Kaleem Iqbal
Summary: This study uses numerical simulations to investigate the flow of nanofluids and heat transfer in a hexagonal enclosure with buoyancy-driven fluid motion. The effects of fluid flow and heat transfer are explored by maintaining hot and cold temperatures on the parallel walls of the cavity. It is found that the Nusselt number increases as the Rayleigh number and nanoparticle volume fraction increase.
RESULTS IN PHYSICS
(2023)
Article
Thermodynamics
Shantanu Dutta, Sukumar Pati, Laszlo Baranyi
Summary: The study shows that the average Nusselt number increases with the volume fraction of nanoparticles and decreases with the Hartmann number. In addition to the influence of fluid properties and external conditions, the geometric variation of the enclosure volume also plays a role in altering the heat transfer rate.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Kashif Ali, Sohail Ahmad, Kottakkaran Sooppy Nisar, Aftab Ahmed Faridi, Muhammad Ashraf
Summary: Hybrid nanoliquids exhibit improved physical strength, mechanical resistance, thermal conductivity, and chemical stability compared to individual nanoliquids. The study found that hybrid nanofluids have the potential to significantly increase shear stress levels, up to 57% in some cases. Caution must be exercised in using these fluids, particularly in applications where control over shear stress is necessary.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Multidisciplinary Sciences
Chenqi Fu, Amin Rahmani, Wanich Suksatan, S. M. Alizadeh, Majid Zarringhalam, Supat Chupradit, Davood Toghraie
Summary: Nanofluid mixed convection in a square cavity with an adiabatic obstacle was investigated using the Lattice Boltzmann method. Different parameters were found to have significant impacts on heat transfer in the enclosure.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Saleem Nasir, Abdallah S. Berrouk, Taza Gul, Atif Ali
Summary: This study uses artificial neural networks to explore the impacts of heat transportation on hybrid nanofluid flow. By developing a model and training it with a dataset, the heat and flow transport characteristics for different input parameters are predicted. The study finds that nanofluids can enhance the thermal distribution of traditional fluids, providing important insights for the design and optimization of heat transfer systems.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
Nilankush Acharya
Summary: This study investigates the impact of I-shaped rectangular fins of different lengths on thermal control and flow behavior, using nanofluids for convective heat transfer research. Numerical simulations reveal the heat transfer characteristics and flow behavior under different parameters.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Miansari Mehdi, Halimi Afshin, Miansari Morteza, Toghraie Davood
Summary: The study found that the positions of the obstacle and outlet, as well as the Richardson number, greatly affect the flow field and heat transfer rate. The maximum heat transfer rate occurs when the outlet and obstacle are located at the bottom of the enclosure and near the right side, respectively, for a Richardson number of 0.1.
JOURNAL OF THERMAL SCIENCE
(2021)
Article
Thermodynamics
Sumeira Yasmin, Shan Ali Khan, Nahid Fatima, Muhammad Imran, Madeeha Tahir, Hassan Waqas, Umar Farooq, Yun-Jie Xu
Summary: In this study, the hydrothermal analysis of MgO-water nanofluid flow across a hexagonal cavity and inner circular cylinder was analyzed. The dimensional equations were transformed into non-dimensional equations, and the Galerkin finite element method was used to solve the non-dimensional system of equations. The results demonstrate that the Rayleigh number has a significant effect on convection, velocity, and heat outcomes.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mathematics
Rusya Iryanti Yahaya, Norihan Md Arifin, Ioan Pop, Fadzilah Md Ali, Siti Suzilliana Putri Mohamed Isa
Summary: This paper investigates the flow of nanofluids over a permeable stretching/shrinking surface and their impact on heat transfer performance. The study found that the thermal conductivity of nanofluids is enhanced with the increase of the heat source parameter. Cu/H2O nanofluid exhibits better heat transfer performance compared to other nanofluids.
Article
Physics, Applied
C. M. Mohana, B. Rushi Kumar
Summary: This study investigates the effects of different nanoparticle shape factors on magnetohydrodynamic boundary layer flow and heat transfer over a stretching sheet. Suitable nanoparticles can control velocity and heat transfer. A magnetic field and porosity decrease velocity, while radiation and heat source/sink increase temperature. The Eckert number and porosity also improve temperature. Increasing nanoparticle volume fraction leads to a decrease in Nusselt number and an increase in skin friction. Among the nanoparticle shapes considered, platelet-shaped nanoparticles show the best flow and heat transfer performance. The results obtained are consistent with previous studies.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Thermodynamics
Javad Mohammadpour, Fatemeh Salehi, Ann Lee, Luca Brandt
Summary: This study focuses on the innovative integration of different cooling techniques to maximize the thermal performance in a 3D microchannel heat sink (MCHS). The effect of particle concentration, orifice spacing, orifice height, oscillation frequency, membrane amplitude, and phase actuation on convective and conductive heat transfer is analyzed. In terms of thermal performance, 180 out-of-phase cases show a higher figure of merit (FOM) than in-phase SJs. Increasing the frequency and amplitude enhances the heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Biochemistry & Molecular Biology
Mohamad Nizam Othman, Alias Jedi, Nor Ashikin Abu Bakar
Summary: This study investigates the MHD stagnation point flow and heat transfer characteristics of CNTs nanofluid over a shrinking surface with heat sink effects, finding that nanofluids perform better in terms of flow and heat transfer compared to regular fluids.
Article
Physics, Multidisciplinary
Umar Nazir, Muhammad Sohail, Abha Singh, Sami Muhsen, Ahmed M. M. Galal, El Sayed M. Tag El Din, Syed M. M. Hussain
Summary: This article examines the impact of dispersing nanoparticles in ethylene glycol on its thermal enhancement. The experimental results show that nanoparticles can improve the properties of ethylene glycol, such as oxidation resistance, anti-evaporation, and anti-aging.
FRONTIERS IN PHYSICS
(2022)
Article
Mechanics
Essam Nabil Ahmed, Alessandro Bottaro
Summary: This study focuses on the fully developed, steady, incompressible, laminar flow in a channel with rough and/or permeable walls. The influence of micro-structured boundary surfaces on the flow behavior is simulated using high-order effective boundary conditions derived from homogenization theory without empirical parameters. A closed-form solution of the Navier-Stokes equations is obtained for the flow in the channel, incorporating slip velocities, shear stress, and streamwise pressure gradient at each virtual boundary. The accuracy and applicability of the model are validated against full feature-resolving simulations for different textures. The Stokes-based model used to identify slip and interface permeability coefficients in the effective boundary conditions is reliable and accurate up to a certain threshold, beyond which advective effects need to be considered.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Mustafa Turkyilmazoglu, Faisal Z. Duraihem
Summary: Thermally-driven natural convection in a porous layer is explored theoretically in this work based on Darcy's law. The study focuses on the non-circulating basic cellular flow between two infinitely long horizontal plates and its instability onset. The results show that a circulatory flow and temperature variation along the horizontal axis govern the motion, and the instability can be determined through linear stability analysis and numerical calculations.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
P. Roca Ramis de Ayreflor, A. Viudez
Summary: In this study, the inelastic interactions between a small, intense dipole and a weak, neutral monopole in two-dimensional flows are examined. It is found that dipoles with small size but large amplitude can cross and scatter off the neutral vortex, while leaving the vortex stable.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Nilanjan Mondal, Chirodeep Bakli
Summary: This study presents a micro-nanochannel junction with directional flow achieved by a combination of junction geometry and wall functionalization. The system acts as a fluid diode with asymmetric pressure drop and flow rate in the nanochannel. The directional junction transport can be tuned with slip length, providing a key parameter for engineering various applications. The findings contribute to the understanding of flow rectification systems in nanochannels and have implications for capillary blood flow, desalination systems, and energy storage devices.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Ussama Ali, Anas Ghannam, Md Islam, Isam Janajreh
Summary: This study utilizes a passive flow control technique involving a slit through a circular structure to dampen flow-induced vibration. The results demonstrate that the presence of a slit can decrease lift and drag coefficients and suppress flow-induced vibration.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Sebastian A. Altmeyer
Summary: This article investigates how an alternating magnetic field can restrict and suppress the generation of vortices in ferrofluidic Couette flow. It finds that when the initially rotating outer cylinder is suddenly stopped, more complex vortex dynamics are generated in the system, and the presence of an alternating magnetic field can modify these dynamics, mainly depending on the modulation amplitude of the field.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Pradeep, L. P. Singh
Summary: This study focuses on the analytical solution to the Riemann problem for a 1-D non-ideal flow of dusty gas with external force. The elementary wave curves, including rarefaction wave, shock wave, and contact discontinuity, were obtained and their implications on density, velocity of flow, and shock speed were examined. The addition of external force results in non-self-similar solutions.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Meng Fan, Antoine Dazin, Gerard Bois, Francesco Romano
Summary: This study investigates the prominent features of the primary instabilities of a turbulent source flow between finite-span parallel rings with spatially modulated inflow conditions rotating at angular rate n. Two different two-dimensional instabilities that occur at large and low flow rates have been traced back to two different physical mechanisms related to jet-wake and mean-core flow, respectively. The effect of the radial aspect ratios on the instability characteristics of the flow between parallel rings is also considered.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Yasmin Hengster, Martin Lellep, Julian Weigel, Matthew Bross, Johannes Bosbach, Daniel Schanz, Andreas Schroder, Florian Huhn, Matteo Novara, Daniel Garaboa Paz, Christian J. Kahler, Moritz Linkmann
Summary: Using curvature and torsion to describe Lagrangian trajectories provides insights into small and large time scales. Probability density functions (PDFs) of curvature and torsion were calculated for experimental Lagrangian trajectories in different flows, and were compared with experimental and numerical simulation results. The effect of anisotropy on geometry or tracer particle trajectories was quantified using the curvature vector, which was found to be related to velocity fluctuations.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Nang X. Ho, Truong V. Vu
Summary: The present paper reports numerical results on the solidification process of a hollow drop on an inclined surface. The drop undergoes deformation and forms an asymmetric tip as the surface angle increases. The solidification time, however, is not affected by the surface angle. The fluid accumulates at the bottom of the drop and the bubble moves upwards before being trapped by solidification. A larger bubble reduces the tip shift. The effect of Bond number and Stefan number on solidification is also considered.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Idalia Jagodzinska, Bartosz Olszanski, Konrad Gumowski, Slawomir Kubacki
Summary: This study investigates the characteristics of high subsonic and transonic flows through a linear cascade using experimental investigations and numerical simulations. The experiments measured static pressure, flow field, and turbulent intensity, and provided inlet conditions for the numerical simulations. The simulations validated the experimental data and tested the applicability of the turbulence models.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Kun Sung Park, Ali Zamiri, Minsuk Choi, Byung Ju Lee, Jin Taek Chung
Summary: In this study, the stator geometry of a single-stage transonic fan was optimized to improve its aerodynamic performance and stall margin. Steady and unsteady simulations were conducted to analyze the impact of shock waves generated by the rotor blade on the stator inlet flow. Using a design of experiment and response surface method, an optimal geometry of the stator blade was obtained to increase the fan's efficiency and stall margin.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Yuanzhao Zhang, Bo Li
Summary: This study investigated the effects of longitudinal and lateral spacing on the aerodynamic drag characteristics of the whole team and each member in speed skating team pursuit competition. The results showed that decreasing the longitudinal spacing resulted in greater drag reduction for the whole team and individual skaters. Furthermore, lateral movement of the leading skater also led to additional drag reduction for the team. Computational fluid dynamics simulations revealed differences in drag distribution between the leading skater and the middle and last skaters.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Sichang Xu, Chris Peirone, Eugene Ryzer, Gary W. Rankin
Summary: This paper presents a study of a special bistable load-type supersonic fluidic oscillator capable of producing self-sustained oscillations in two gas pressure chambers. The experimental portion verifies the robust nature of the device performance and shows distinct differences compared to a similar prototype. A three-dimensional computational fluid dynamics model is required to accurately simulate the transient filling process, leading to an unaffordable computational cost. To address this issue, a low-order fluid circuit model is developed, which provides an accurate and rapid prediction of the transient performance.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
Article
Mechanics
Sampson Davis, Eli Shellabarger, James Miller, Thomas Ward
Summary: The present work focuses on studying the effects of shock wave - boundary layer interaction in 2D hypersonic flow at the sharp leading edge of a flat plate and a flat plate followed by a compression ramp. A key parameter, the hypersonic interaction parameter x, is defined and analyzed using a semi-analytic reduced-order model. The study aims to improve on existing methods by characterizing the viscous boundary layer and investigating the upstream influence resulting from the compression ramp.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2024)
