International Communications in Heat and Mass Transfer
About: International Communications in Heat and Mass Transfer is an academic journal. The journal publishes majorly in the area(s): Heat transfer & Nusselt number. It has an ISSN identifier of 0735-1933. Over the lifetime, 6015 publication(s) have been published receiving 132169 citation(s).
Papers published on a yearly basis
TL;DR: In this article, a comparison between experimental results obtained for nanofluid to homogeneous model in low concentration are close to each other but by increasing the volume fraction, higher heat transfer enhancement for Al 2 O 3 ǫ/ǫ water can be observed.
Abstract: In the present investigation nanofluids containing CuO and Al 2 O 3 oxide nanoparticles in water as base fluid in different concentrations produced and the laminar flow convective heat transfer through circular tube with constant wall temperature boundary condition were examined. The experimental results emphasize that the single phase correlation with nanofluids properties (Homogeneous Model) is not able to predict heat transfer coefficient enhancement of nanofluids. The comparison between experimental results obtained for CuO / water and Al 2 O 3 / water nanofluids indicates that heat transfer coefficient ratios for nanofluid to homogeneous model in low concentration are close to each other but by increasing the volume fraction, higher heat transfer enhancement for Al 2 O 3 / water can be observed.
TL;DR: In this article, the thermal conductivities of CNT-ethylene glycol and synthetic engine oil suspensions were investigated using a modified transient hot wire method, and the results showed that CNT nanofluids have noticeably higher thermal conductivity than the base fluid without CNT.
Abstract: Thermal conductivity enhancements in ethylene glycol and synthetic engine oil in the presence of multi-walled carbon nanotubes (MWNTs) are investigated. CNT nanofluids are prepared using a two-step method. The volume concentration of CNT–ethylene glycol suspensions is below 1.0 vol.% and that of CNT–synthetic engine oil suspensions is below 2.0 vol.%. The thermal conductivities of the CNT suspensions are measured with a modified transient hot wire method. The results show that CNT–ethylene glycol suspensions have noticeably higher thermal conductivities than the ethylene glycol base fluid without CNT. The results for CNT–synthetic engine oil suspensions also exhibit the same trend. For CNT–ethylene glycol suspensions at a volume fraction of 0.01 (1 vol.%), thermal conductivity is enhanced by 12.4%. On the other hand, for CNT–synthetic engine oil suspension, thermal conductivity is enhanced by 30% at a volume fraction of 0.02 (2 vol.%). The rates of increase are, however, different for different base fluids. The CNT–synthetic engine oil suspension has a much higher enhanced thermal conductivity ratio than the CNT–ethylene glycol suspension.
TL;DR: In this article, an improved functionality of phase change materials (PCM) through dispersion of nanoparticles is described, which exhibit enhanced thermal conductivity in comparison to the base material.
Abstract: Improved functionality of phase change materials (PCM) through dispersion of nanoparticles is described. The resulting nanoparticle-enhanced phase change materials (NEPCM) exhibit enhanced thermal conductivity in comparison to the base material. Starting with steady state natural convection within a differentially-heated square cavity that contains a nanofluid (water plus copper nanoparticles), the nanofluid is allowed to undergo solidification. Partly due to increase of thermal conductivity and also lowering of the latent heat of fusion, higher heat release rate of the NEPCM in relation to the conventional PCM is observed. The predicted increase of the heat release rate of the NEPCM is a clear indicator of its great potential for diverse thermal energy storage applications.
TL;DR: In this paper, the authors investigated the effect of different types and volume fractions of nanoparticles on heat transfer in horizontal annuli using nanofluids and found that nanoparticles with high thermal conductivity caused significant enhancement of heat transfer characteristics.
Abstract: Heat transfer enhancement in horizontal annuli using nanofluids is investigated. Water-based nanofluid containing various volume fractions of Cu, Ag, Al2O3 and TiO2 nanoparticles is used. The addition of the different types and different volume fractions of nanoparticles were found to have adverse effects on heat transfer characteristics. For high values of Rayleigh number and high L/D ratio, nanoparticles with high thermal conductivity cause significant enhancement of heat transfer characteristics. On the other hand, for intermediate values of Rayleigh number, nanoparticles with low thermal conductivity cause a reduction in heat transfer. For Ra=10 3 and Ra=10 5 the addition of Al2O3 nanoparticles improves heat transfer. However, for Ra=10 4 , the addition of nanoparticles has a very minor effect on heat transfer characteristics.
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