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首页> 外文期刊>Journal of enhanced heat transfer >THERMAL PERFORMANCE OF GRAPHENE OXIDE NANOFLUID IN MICROCHANNEL HEAT EXCHANGER
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THERMAL PERFORMANCE OF GRAPHENE OXIDE NANOFLUID IN MICROCHANNEL HEAT EXCHANGER

机译：微通道换热器中石墨烯氧化物纳米流体的热性能

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摘要

Device miniaturization and complex work load due to rapid growth in technologies have imposed great challenges in aspects of thermal management to prevent overheating. Nanofluids are emerging as thermal solutions due to their enhanced thermal properties. Recently, graphene oxide (GO) nanofluids (NFs) has been studied and found to have high thermal conductivity. However, their potential in microchannel heat exchangers (MCHEs) remains unknown. This study aims to investigate the thermal performance of GO-NFs in MCHEs. GO nanoparticles were synthesized and confirmed using X-ray diffraction, whereas GO-NFs (0.02-0.1 wt. %) were prepared and analyzed in terms of viscosity and thermal conductivity. The results showed that the minor addition of GO nanoparticles did not significantly affect the viscosity of GO-NFs, whereas the thermal conductivity was remarkably enhanced. This indicates that GO-NFs are very promising since they are able to improve the thermal performance of MCHEs with negligible impact on the pressure drop at low nanoparticle loading. The thermal performance of GO-NFs in MCHEs was investigated at different inlet flow rates (0.5-2 mL/min) and set temperatures (50-90 degrees C). At a given set temperature, GO-NFs showed excellent thermal performance compared to water due to their higher thermal conductivity. Furthermore, GO-NFs showed better thermal performance at higher set temperatures due to their higher thermal conductivity at higher temperatures. This temperature-dependent thermal conductivity of GO-NFs is essential especially in applications involving higher temperatures. Furthermore, no clogging of GO nanoparticles in microchannels was observed at minor GO loadings (0.02-0.1 wt.%). These results indicate that GO-NFs are very effective in heat transfer applications compared to water.
机译：由于技术的快速增长，设备小型化和复杂的工作负荷在热管理的方面存在巨大挑战，以防止过热。由于其增强的热性能，纳米流体作为热解。最近，已经研究了石墨烯（GO）纳米流体（NFS）并发现具有高导热率。然而，它们在微通道热交换器（MCHES）中的潜力仍然未知。本研究旨在调查MCHES中GO-NFS的热性能。使用X射线衍射合成并确认去纳米颗粒，而Go-NFS（0.02-0.1重量％）被制备并在粘度和导热率方面进行分析。结果表明，Go纳米颗粒的次要添加没有显着影响Go-NFS的粘度，而导热率显着增强。这表明Go-NFS非常有前途，因为它们能够改善低纳米颗粒载荷对压降的可忽略损伤的热性能。在不同的入口流速（0.5-2mL / min）和设定温度（50-90℃）的情况下，研究了MCHE中Go-NFS的热性能。在给定的设定温度下，由于较高的导热率，Go-NFS与水相比，与水相比，具有优异的热性能。此外，由于其在较高温度下的导热性较高，Go-NFS在更高的温度下显示出更好的热性能。 Go-NFS的这种温度依赖性导热率特别是在涉及较高温度的应用中。此外，在轻微的载荷（0.02-0.1重量％）下观察到微通道中的GO纳米颗粒的堵塞。这些结果表明，与水相比，Go-NFS在传热应用中非常有效。

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