Showing papers on "Heat transfer published in 2022"
TL;DR: In this article , a review of the physical properties of nanofluids and their applications is presented, with a brief overview of the potential applications and future research gaps, as well as recommendations regarding current scientific gaps and future directions.
97 citations
83 citations
TL;DR: In this article , the dynamics of water colloidally mixed with three distinct types of nano-sized particles were investigated. And the results for boundary layer flow showed that increasing the density of spherical nanoparticles caused a reduction in the friction between the layers of water-based ternary-hybrid nanofluid and the wall, and an increment in friction from the wall till the free stream.
83 citations
TL;DR: In this article , a novel design on angled fins was proposed to improve the thermal transport for phase change materials (PCMs) in a shell-and-tube thermal storage unit, and a numerical model was built and verified by comparing with experimental observations on the melting front evolution and temperature history.
82 citations
TL;DR: In this paper, a novel design on angled fins was proposed to improve the thermal transport for phase change materials (PCMs) in a shell-and-tube thermal storage unit, and a numerical model was built and verified by comparing with experimental observations on the melting front evolution and temperature history.
82 citations
TL;DR: In this paper , the authors present the current state-of-the-art in immersion cooling of lithium-ion batteries, discussing the performance implications of immersion cooling, identifying gaps in the literature which include a lack of studies considering the lifetime, fluid stability, material compatibility, understanding around sustainability and use of immersion for battery safety.
79 citations
TL;DR: In this article , a two-dimensional numerical model is established and validated through comparing with experimental data in literature to study the enhanced heat transfer of adding longitudinal fins in a horizontal shell-and-tube heat storage unit.
75 citations
TL;DR: In this article , the authors used the multi-physics COMSOL software and the Darcy-Brinkman-Forchheimer model with a porosity of 0.4 to conduct a numerical study on heat transfer by Cu-TiO2/EG hybrid nano-fluid inside a porous annulus between a zigzagged triangle and different cylinders and under the influence of an inclined magnetic field.
Abstract: The current study uses the multi-physics COMSOL software and the Darcy–Brinkman–Forchheimer model with a porosity of ε = 0.4 to conduct a numerical study on heat transfer by Cu-TiO2/EG hybrid nano-fluid inside a porous annulus between a zigzagged triangle and different cylinders and under the influence of an inclined magnetic field. The effect of numerous factors is detailed, including Rayleigh number (103 ≤ Ra ≤ 106), Hartmann number (0 ≤ Ha ≤ 100), volume percent of the nano-fluid (0.02 ≤ ϕ ≤ 0.08), and the rotating speed of the cylinder (−4000 ≤ w ≤ 4000). Except for the Hartmann number, which decelerates the flow rate, each of these parameters has a positive impact on the thermal transmission rate.
75 citations
TL;DR: In this paper , the authors used the 3-stage Lobatto IIIa integration formula for a finite difference (MATLAB package bvp4c) to solve the same problem.
71 citations
TL;DR: In this article, the progress and challenges on thermal management of different electrochemical energy devices including fuel cells, electrolysers and supercapacitors are discussed in-depth and some directions for future studies are provided.
TL;DR: In this article , the progress and challenges on the thermal management of different electrochemical energy devices including fuel cells, electrolysers and supercapacitors are discussed in-depth and some directions for future studies are provided.
TL;DR: In this article, the authors report an unsteady and incompressible flow of Williamson nanoliquid in presence of variable thermal characteristics are persuaded by a permeable stretching cylinder.
Abstract: This analysis reports an unsteady and incompressible flow of Williamson nanoliquid in presence of variable thermal characteristics are persuaded by a permeable stretching cylinder. The flow field investigation is established with the effect of mixed convection and non-uniform heat source/sink on flow and heat transfer. On the cylinder surface, the analysis is inspected with utilization of zero mass flux constraints. By using the appropriate similarity variables, the framed equations for the energy, momentum and mass is converted into non-linear ODEs. The numerical communication of the boundary value problem is successfully implemented using a computer algorithm programmed into the fifth Runge-Kutta scheme. Additionally, the wall shear factor and rate of heat transfer are calculated in two different cases namely, with curvature and without curvature. In addition, the results obtained are confirmed by making comparisons with previously published articles and we found an excellent match that guarantees the indemnity of current communication. A comprehensive change in velocity, temperature and concentration is examined for involved parameters like local Weissenberg number, space dependent heat source constant, magnetic number, curvature constant, thermophoretic parameter, buoyancy parameter, Brownian motion parameter, Prandtl number, Schmidt number, unsteadiness parameter, reaction rate parameter, activation energy parameter and temperature difference parameter. A reduction in velocity is observed for unsteady parameter and buoyancy constant. An enhanced nanofluid temperature is noted for space dependent heat source parameter, time dependent heat source parameter and unsteady parameter. Moreover, the nanofluid concentration is increases for temperature difference parameter while reverse observations are noticed for chemical reaction rate.
TL;DR: In this article , the thermal performance of moving porous fin wetted with hybrid nanofluid with different cross-sections in the presence of a magnetic field is investigated, and the results show that Akbari-Ganji's method has good accuracy in solving heat transfer equations related to moving porosity fin.
TL;DR: A review of the thermal properties of nanofluids can be found in this article , where the authors discuss the various parameters that have been found to impact the thermal behavior in general significantly and the thermal conductivity of these nanometrics, including particle size and shape, pH of the fluids, surfactant, solvent type, hydrogen bonding, temperature, base fluids, and particular interest here, the alignment of the nanoparticles utilized (carbon nanotubes, Graphene, and metal oxides nanoparticles).
TL;DR: In this article , the effects of the Hall current, rotation and Soret are studied for the MHD free convection heat and mass transfer flow of a viscous, incompressible, and electrically conducting fluid passing through a vertical plate embedded in a porous medium in the presence of chemical reactions and thermal radiation.
Abstract: The unsteady MHD free convection heat and mass transfer flow of a viscous, incompressible, and electrically conducting fluid passing through a vertical plate embedded in a porous medium in the presence of chemical reactions and thermal radiation is investigated. The effects of the Hall current, rotation and Soret are studied. Using the perturbation approach, one can obtain an accurate analytical solution to the governing equations for the fluid velocity, fluid temperature, and species concentration, provided that the initial and boundary conditions are acceptable. It is possible to obtain expressions for the shear stress, rate of heat transfer, and rate of mass transfer for both plates with the ramping temperature and isothermal conditions. On the one hand, the numerical values of the primary and secondary fluid velocities, fluid temperature, and species concentration are presented graphically. On the other hand, the numerical values of the shear stress and rate of mass transfer for the plate are presented in tabular form for various values of the relevant flow parameters. These values are given for a range of pertinent flow parameters. It was determined that an increase in the Hall and Soret parameters over the whole fluid area leads to a corresponding increase in the resulting velocity. The resultant velocity continually climbs to a high level due to the contributions of the thermal and solute buoyancy forces. Lowering the heat source parameter reduces the temperature distribution, resulting in a lower overall temperature. When there is a rise in the chemical reaction parameter over the whole fluid area, there is a corresponding decrease in the concentration. The concentration buoyancy force, Hall current, and Prandtl number reduce the skin friction. On the other hand, the permeability of the porous medium, rotation, chemical reaction, the Soret number, thermal buoyancy force, and mass diffusion all have the opposite effects on the skin friction.
TL;DR: In this paper , an infinite porous disk was used to communicate the Marangoni convection flow of hybrid nanomaterials by using Von Kamran variables and Darcy-Forchheimer law.
TL;DR: In this paper , a horizontal uniform magnetic field is employed to regularize the flow field triggered due to a rotating disk, which leads to a similarity system of equations with the help of the traditional von Kármán similarity transformations.
Abstract: Abstract Magnetic field is often applied to stabilize the flow field in real life applications of fluid mechanics problems. In the present work, it is employed a horizontal uniform magnetic field to regularize the flow field triggered due to a rotating disk. The energy equation is also studied subjected to such a horizontal magnetic field. The applied horizontal magnetic field is different from the well-known applied external vertical magnetic field. It is shown that the horizontal magnetic field leads to a similarity system of equations with the help of the traditional von Kármán similarity transformations. The effects of such a magnetic field on the development of velocity and temperature fields are then numerically investigated. The existence of exact series solutions in terms of decaying exponential functions is further discussed. The critical roles of horizontal magnetic field on the physical quantities involving the local wall shears, torque and the heat transfer rate are finally highlighted.
TL;DR: In this article , the authors investigated the steady stream and energy transfer of hybridizing nanoparticles across a surface with radiative impacts, and used the Galerkin finite element technique to solve the issue analytically.
TL;DR: The innovative integration of Janus wettability and heat conduction in hierarchically designed textiles ensures a minimum sweat consumption, avoiding harmfully excessive perspiration and presents great advantages for smart textile, energy-saving, and personal cooling applications.
Abstract: Personal cooling textiles are a promising energy-free pathway for confronting serious heat-related public health threats and improving industrial worker productivity. Current cooling strategies mainly focus on passive daytime radiation, and there is a lack of research on all-day cooling methods which utilize synergistic radiative, conductive, and evaporative heat dissipation. Herein, we demonstrate a hierarchical polyurethane/silicon nitride fibrous membrane with Janus wettability fabricated via a scalable electrospinning method followed by single-side hydrophilic plasma treatment. High angular-dependent solar reflectance (91%) and human body infrared emittance (93%) allow for a temperature drop of ∼21.9 °C under direct sunlight and ∼2.8 °C at night compared with traditional cotton. The innovative integration of Janus wettability and heat conduction in hierarchically designed textiles ensures a minimum sweat consumption of 0.5 mL h-1, avoiding harmfully excessive perspiration. The excellent all-day cooling performance of this hierarchical textile presents great advantages for smart textile, energy-saving, and personal cooling applications.
TL;DR: In this paper , the convection heat transfer in a countercurrent double-tube heat exchanger with various fins in a turbulent flow is investigated, and the results show that the water aluminum oxide nanofluid has a better convective heat transfer coefficient than water titanium dioxide and pure water.
TL;DR: In this paper , the effects of the metal foam-fin hybrid structure and the inclination angle on the phase change process were investigated by using the numerical simulation method, and the results demonstrated that the optimized heat transfer performance of the Metal Fo-Fin hybrid structure could reduce the melting time.
TL;DR: In this paper, the influence of parameters such as spacing, EG (expanded graphite) content, battery direction, coolant flow rate and pipe diameter on the cooling performance was analyzed.
TL;DR: In this paper , an analogous study of the velocity and temperature profiles inside microchannel cooling plates (with hydraulic diameter of 6 mm), placed on a large pouch-type LiFePO4 battery, is presented using both the laboratory and simulation techniques.
Abstract: In this paper, an analogous study of the velocity and temperature profiles inside microchannel cooling plates (with hydraulic diameter of 6 mm), placed on a large pouch-type LiFePO4 battery, is presented using both the laboratory and simulation techniques. For this, we used reverse engineering (RE), computed tomography (CT) scanning, Detroit Engineering Products (DEP) MeshWorks 8.0 for surface meshing of the cold plate, and STAR CCM+ for steady-state simulation. The numerical study was conducted for 20 A (1C) and 40 A (2C) and different operating temperatures. For experimental work, three heat flux sensors were used and were intentionally pasted at distributed locations, out of which one was situated near the negative tab (anode) and the other was near the positive tab (cathode), because the heat production is high near electrodes and the one near the mid body. Moreover, the realizable k-ε turbulence model in STAR CCM+ is used for simulation of the stream in a microchannel cooling plate, and the computational fluid dynamics (CFD) simulations under constant current (CC) discharge load cases are studied. Later, the validation is conducted with the lab data to ensure sufficient cooling occurs for the required range of temperature. The outcome of this research work shows that as C-rates and ambient temperature increase, the temperature contours of the cooling plates also increase.
TL;DR: In this paper , the main consequences arising from the convective motion of a bi-phasic mixture near a linearly stretching sheet for a micropolar nanofluidic medium including 60% of ethylene glycol, 40% of pure water, and a certain volume fraction of alumina nanoparticles are explored.
TL;DR: In this paper , the impact of the Atangana-Baleanu (AB) time-fractional integral on second-grade fluid with ternary nanoparticle suspension across an infinite vertical plate was studied.
Abstract: The impact of the Atangana-Baleanu (AB) time-fractional integral on second-grade fluid with ternary nanoparticle suspension across an infinite vertical plate was studied in this paper. By generalized Fourier's law, the generalized fractional constitutive equation for the thermal flux explains a thermal process with memory. Closed-form solutions are calculated using Laplace transform and represented using Lorenzo and Hartley G–functions and integral forms. The numerical effects of physical and fractional parameters are presented.
TL;DR: In this article , the thermal evaluation of hybrid nanofluid containing four types of nanoparticles subject to the non-uniform heat source/sink and inclined magnetic field for two-dimensional unsteady flow due to permeable stretched surface has been numerically investigated.
TL;DR: In this paper, a finite difference method is implemented to solve the governing non-linear partial differential equations representing momentum and temperature equations in a square cavity with thermal radiation and magnetic field.
Abstract: Numerical investigation on natural convection heat transfer of Tiwari - Das model nanofluid inside a square cavity with thermal radiation and magnetic field is carried out in this analysis. Ethylene Glycol E G is considered as base fluid and T i O 2 (Titanium Oxide) considered as nanoparticles for the present investigation. The side horizontal walls of cavity are assumed to be adiabatic and isothermal conditions on both sides walls are considered in this analysis. The finite difference method is implemented to solve the governing non-linear partial differential equations representing momentum and temperature equations. The sway of volume fraction parameter ( 0.01 ≤ ϕ ≤ 0.09 ) , magnetic field parameter ( 1.0 ≤ M ≤ 3.0 ) , Rayleigh number ( 100 ≤ R a ≤ 1000 ) , radiation parameter ( 0.1 ≤ R ≤ 0.9 ) , Reynolds number ( 0 . 1 ≤ R e ≤ 0 . 5 ) and Prandtl number ( 5.2 ≤ P r ≤ 7.2 ) on T i O 2 - E G nanofluid flow and heat transfer is illustrated through graphs. Furthermore, the codes of average Nusselt number with dissimilar values of pertinent parameters are also calculated and results are depicted through graphs. The result shows that, temperature of T i O 2 - E G nanofluid escalates inside the cavity with higher values of (M). Higher heat can be transferred from hot wall to cold wall when radiation parameter (R) intensifies.