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Showing papers in "International Journal of Thermal Sciences in 2020"


Journal ArticleDOI
TL;DR: In this paper, free convection heat transfer of a suspension of nano-encapsulated phase change materials (NEPCMs) is simulated and discussed in an inclined porous cavity.

142 citations


Journal ArticleDOI
TL;DR: In this article, the authors quantified the heat transfer coefficient (HTC) of Fe3O4 aqueous nano-suspension at various mass concentrations of 0.05% 0.2%.

114 citations


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the heat transfer and flow characteristics of the air-water cross flow over cambered ducts and found that the cosinoidal duct is superior to that of the rectangular duct by 7.3% to 28.1%.

54 citations


Journal ArticleDOI
TL;DR: In this article, a novel and innovative baffle design was offered in order to considerably reduce shell side pressure loss without compromising thermal performance, and the results showed that a so-called three-zonal baffle could be superior over the several other configurations considered.

53 citations


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effect of liquid subcooling on the heat transfer performance of a graphene oxide (GO) nanocoating surface with distilled water at atmospheric pressure, and they found that the enhanced wettability and high thermal conductivity of the surface were mainly attributed to the increased surface roughness.

45 citations


Journal ArticleDOI
TL;DR: In this article, the melting of phase change material (PCM) inside a rectangular enclosure, possibly finned and inclined, is studied numerically and the application of this work is related to the temperature control of a finned PV panel filled with PCM and installed at different tilt angles.

45 citations


Journal ArticleDOI
TL;DR: In this paper, additive manufacturing was used to realize three innovative 3D metallic periodic structures, with different base pore sizes (10, 20, and 40mm) and constant porosity, to be filled with a suitable phase change material (PCM).

44 citations


Journal ArticleDOI
TL;DR: In this article, the influence of geometrical parameters for eight spirally inner corrugated tubes at turbulent flow (R e = 25 × 10 3 ) in a double pipe heat exchanger was analyzed and validated with an experimental setup.

43 citations


Journal ArticleDOI
TL;DR: In this article, the effects of perforated index (0.08) on the thermal performance and heat transfer enhancement are investigated, and the results show that the fluid mixing between the core region and the tube walls for the case of 0.7 is higher than the other cases.

42 citations


Journal ArticleDOI
TL;DR: In this article, the effects of the Reynolds number, Re, and the peak deviation position on the thermal-hydraulic performances of the microchannels were analyzed based on the performance evaluation criteria (PEC) and the principle of entropy generation.

42 citations


Journal ArticleDOI
TL;DR: In this paper, a 40×-90mm fin with a 10mm pitch provided complete phase change for both melting and freezing in the constrained time duration of 900s, compared to only 47.3% for a non-finned version.

Journal ArticleDOI
TL;DR: In this paper, three of the most dominant parameters affecting the thermal-hydraulic performance of finned and tube heat exchanger were experimentally investigated and the results were examined from the point of heat transfer and pressure drop mechanisms of louvered and wavy fin for the different number of tuberows, fin pitches and air inlet velocities.

Journal ArticleDOI
TL;DR: In this article, the authors examined the hydrodynamic structure of the fluid which improves the rate of heat transfer in parallel with the penalty of pressure drop by means of the time-averaged streamlines topology,, streamwise velocity distribution,, vorticity concentration, and turbulent Reynolds stress, u'v'/U2 for the sinusoidal wavy channel.

Journal ArticleDOI
TL;DR: In this paper, the phase change flow inside a Li-ion battery enclosure with a copper metal foam embedded in paraffin wax phase change material (PCM) was studied numerically.

Journal ArticleDOI
TL;DR: In this article, the authors compared three types of surfaces, namely smooth, concave structured, and convex structured, to investigate the mechanism of nucleate boiling via molecular dynamics simulations, and showed that nanostructured surfaces enhance bubble nucleation compared to smooth surfaces, provide fixed nucleation sites for initial embryo generation and shorten incipient nucleation time.

Journal ArticleDOI
TL;DR: In this paper, the authors focused on studying the transverse temperature distributions induced by ceiling jet under the effect of ceiling mechanical smoke extraction system and found that the attenuation rate of transversal temperature increases as the increasing ceiling mechanically smoke extraction velocities.

Journal ArticleDOI
Jiaqiang Han1, Fang Liu1, Fei Wang1, Miaocheng Weng1, Jun Wang1 
TL;DR: In this article, the authors investigated the downstream temperature distribution and smoke movement in a slopping tunnel with one ended-portal, experimentally and numerically, and found that the fire plume tended to incline towards the end wall in the tunnel with or without slope.

Journal ArticleDOI
TL;DR: In this paper, the effects of insertion of a straight tape mounted with double-sided V-baffles used as a longitudinal vortex generator (LVG) on turbulent convection heat transfer behaviors in a constant heat-fluxed tube in the Reynolds number (Re) range of 4120 to 25,800 are experimentally and numerically investigated.

Journal ArticleDOI
TL;DR: In this article, the phase change materials (PCMs) of latent heat storage systems are enhanced by dispersing nanoparticles in base PCMs for increased heat transfer rate. And the authors investigated the thermal transfer characteristics of the newly developed erythritol PCM dispersed with 1-wt% graphene nanoparticles during charging and discharging processes.

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a unified soil thermal conductivity model to consider these influence factors based on a screened artificial neural network (ANN) approach, which is constrained with model complexity optimization and monotonicity control.

Journal ArticleDOI
TL;DR: In this article, the stability of Al2O3-water nanofluids was evaluated on rest exploiting different surfactants, and the effect of the presence of surfactant on the TPCT thermal performance was studied.

Journal ArticleDOI
Yunfei Yan1, Ziqiang He1, Gange Wu1, Li Zhang1, Zhongqing Yang1, Lixian Li1 
TL;DR: In this article, the influence of hydrogels embedding positions on adaptive cooling in fractal microchannel heat sink is investigated by numerical simulation, and the authors show that the hydrogel embedding position has a significant influence on the cooling performance of the heat sink.

Journal ArticleDOI
TL;DR: In this article, the MOGA optimization was applied to study the design of the helically coiled tube, and the results showed that the heat transfer ENG does not always correspond to the heat-transfer coefficient; the flow resistance EGN did not always match the flow-resistance; and there are three optimal points for the optimization: A (minimized Ns), B (maximized h & minimized |Δp|) and C (maximalized h and minimized | Δp| & minimized Ns).

Journal ArticleDOI
TL;DR: In this article, the numerical and experimental data of the helically coiled-twisted trilobal tube (HCTTT) heat exchanger are compared, the results present that, due to more intense secondary flow of the HCTTT caused by the superposition of overall twist and self-twist, region near the center of the hCTTT has higher turbulent kinetic energy, and the regions near the wall of the HCX is with the better Field synergy Angle.

Journal ArticleDOI
TL;DR: In this article, a series of simulations are conducted in full-scale inclined road tunnels to explore the effect of tunnel width and slope on ceiling gas temperature pattern in fire, and a correlation of the maximum gas excess temperature with tunnel width was proposed by dimensional analysis.

Journal ArticleDOI
TL;DR: In this article, a novel form-stable phase change TIMs is proposed, where the thermal conductivity of paraffin wax (PA) is improved by filling Al2O3 particles.

Journal ArticleDOI
TL;DR: In this paper, a precise heat transfer simulation of a three-dimensional impinging jet porous heat sink is presented and analyzed from thermodynamics vantage point under local thermal non-equilibrium condition.

Journal ArticleDOI
TL;DR: In this article, a multi-chips module combined with ball grid array (MCM-BGA) 3D package model was established; the thermal interface resistance between the micro-channel heat sink and heat spreader was considered; the flow heat transfer as well as thermal stress performance of the model were discussed.

Journal ArticleDOI
TL;DR: In this paper, the effect of synthetic jet actuator geometry and supply parameters on heat transfer enhancement has been investigated with the use of classical thermal balance method, and the correlations for the stagnation point Nusselt number of an axisymmetric impinging synthetic jet characterized by large Reynolds numbers have been obtained.

Journal ArticleDOI
TL;DR: In this paper, the authors systematically investigate using experimentally validated computational fluid dynamics model for different shapes of down-configuration of ribs in curved SAH and find that half-trapezoidal and quarter-circular shape ribs showed maximum increase in thermal performance i.e. 17% and 16% respectively.