Showing papers in "International Journal of Thermal Sciences in 2021"

TL;DR: The heat transfer and pressure drop performance of magnetic nanofluids (MNFs) under different alternating magnetic fields were investigated experimentally as discussed by the authors, and the results showed that the effect of alternating magnetic field on local heat transfer coefficient is better than that of unidirectional and non-magnetic fields along flow direction.

TL;DR: In this paper, numerical simulations were adopted to explore the heat transfer and flow characteristics of magnetic nanofluids under different magnetic field intensities, volume fractions, and magnetic field directions, and they found that the effect of heat transfer enhancement was small under a weak magnetic field, but it increased considerably under a strong magnetic field.

TL;DR: In this paper, the heat transfer and fluid flow characteristics of open microchannel heat sinks consist of square pin fins are examined. But, the performance of the heat sink has not been evaluated.

TL;DR: In this paper, the effects of different twisted tapes on heat transfer and flow characteristics in a heat exchanger tube is experimentally investigated, and the results indicated that the use of twisted tape inserts enhances the heat transfer performance.

TL;DR: In this article, an analysis of average Nusselt number (Nuavg), which indicates the heat removal from the battery pack cooled by flowing fluid is carried out considering coupled heat transfer condition at the pack and coolant interface.

TL;DR: In this paper, the Nusselt number and friction factor correlations are proposed by performing a non-linear regression analysis of the rib geometry in the investigated range of parameters and the optimized rib geometry is obtained.

TL;DR: In this paper, the effect of channel geometry on overall performance was studied to understand the fluid flow and heat transfer characteristics of micro-channel heat sinks having groove sidewalls, and the results indicated that the overall performance can be greatly improved by arranging grooves on channel sidewalls.

TL;DR: In this article, a ground-based experimental investigation of the gas-atomized spray cooling using various micro-structured surfaces and a flat surface is provided and discussed, and a cooling correlation of gas-atomic spray cooling upon micro-structure surfaces is provided with a relative error within ±9%.

TL;DR: In this article, double perforated elliptic turbulators were used for double-pipe heat exchangers with novel Double-Perforated Inclined Elliptic (DPIE) turbulators.

TL;DR: In this paper, the authors proposed fin structures constituting straight and arc fin for heat transfer enhancement, which significantly increase the heat dissipation rate from the battery to phase change materials (PCM).

TL;DR: In this article, a novel interrupted microchannel with double circular pin-fins in each microchamber (IMCDCP) is designed to combine the advantages of micro-chamber and circular pinfin in heat transfer enhancement.

TL;DR: In this article, a combination of computational fluid dynamics consisting of the discrete phase model (CFD-DPM) coupled with support vector regression-particle swarm optimization (SVR-PSO) techniques to maximize the cooling performance of Al2O3water nanofluids in a microchannel heat sink (MCHS) with multiple synthetic jets (SJs).

TL;DR: In this paper, the authors investigated the performance index ratio of nickel/water nanofluids flow in a corrugated plate heat exchanger and found that the increase of nanoparticle loadings and Reynolds number leads to an augmentation of the overall heat transfer coefficient, heat transfer coefficients, and Nusselt number.

TL;DR: In this paper, a triple tube heat exchanger with rib-type inserts was used to identify the thermodynamic effect of nanofluid under the concentration range of 0.5% to 3.0%.

TL;DR: In this paper, the thermal performance of a functionally-graded foam, with a uniform heat flux entering one of its sides, is investigated numerically in a Local Thermal Non Equilibrium (LTNE) model.

TL;DR: In this article, the authors presented a CFD study for hydronic radiant heating floors with phase change materials (PCM) bands embedded in a concrete core in accordance with several arrangements depending on the bandwidth and position with respect to the heating pipes.

TL;DR: In this paper, a combined thermal management system for lithium-ion battery, which conjugates the air cooling and phase change material (PCM) cooling, is proposed, and the results show that the maximum battery temperature with natural convection only exceeds the optimum temperature at 1C.

TL;DR: In this paper, the variation of the maximum gas excess temperature beneath the ceiling and temperature profile under natural ventilation considering different fire locations in a branched tunnel were investigated. But the results showed that due to unbalanced air entrainment, the fire located at the intersection of the tunnel tilts towards the sidewall.

TL;DR: In this article, the authors present a new visualization tool to explore the local action of the magnetic force during magnetohydrodynamic (MHD) convection, in-depth using three typical thermal cavities undergoing MHD convection over a range of parametric variations.

TL;DR: In this paper, the forced convection heat transfer and flow characteristics of water base fly ash-Cu (80:20% by volume) hybrid nanofluid (HNF) flow through a copper tube under a constant heat flux (CHF) of 7962W/m2 experimentally and numerically.

TL;DR: In this paper, the authors applied the finite volume method to solve the volume fraction of iron oxide nanoparticles inside a triangular chamber with a hot wavy wall using the finite-volume method.

TL;DR: In this article, an experimental investigation has been carried out to study the thermo-hydraulic performance of a solar air heater with staggered multiple C-shape perforated and non-perforated finned absorber plate.

TL;DR: In this paper, three types of helical microtube coil namely circle, oval and elliptical are introduced and evaluated both experimentally and numerically both for all geometries.

TL;DR: In this paper, the thermal properties of epoxy composites reinforced by carbon nanotubes are investigated using atomistic simulations, and the observed behavior is interpreted on the basis of the properties of the nanofillers, matrix and interfaces alone.

TL;DR: In this paper, a comparative experimental study to examine the double tube heat exchanger with various modified twisted tape and wire coil inserts is performed using Al2O3+MWCNT hybrid nanofluid.

TL;DR: Considering the change of thermophysical properties at high temperatures and the coupling between the heat source and the molten pool surface, a new numerical simulation method was proposed and verified in this paper, where the thermal history and formation of the pool, the convective pattern, and the solidification morphology of the cladding have been analyzed.

TL;DR: In this article, the Spearman rank order correlation coefficients between radiative cooling performance and the CIE-LCH color space parameters (lightness, chroma, and hue) are calculated, revealing that the lightness plays a dominant role.

TL;DR: In this article, a neural network with 41 neurons within the hidden layer was used to predict the BHTC and wall superheat with correlation coefficients (R) of 0.99936 and 0.9986, respectively.

TL;DR: In this article, a three-dimensional (3D) computational fluid dynamics (CFD) model is developed to analyse the air-side heat transfer and pressure drop performances in twisted oval tube (TWT) bundle with staggered layout operating in air-water cross-flow.

TL;DR: In this paper, experimental studies for the determination of heat transfer coefficient (HTC) and friction factor for the flow of a fly ash nanofluid in a copper tube under constant heat flux boundary condition are presented.