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首页> 外文期刊>Journal of Heat Transfer >Theoretical Investigation of Al_2O_3 Nanoparticle Slip Mechanisms in High-Viscosity Two-Component Mixture in Two-Phase Flow
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Theoretical Investigation of Al_2O_3 Nanoparticle Slip Mechanisms in High-Viscosity Two-Component Mixture in Two-Phase Flow

机译：两相流高粘度双组分混合物中Al_2O_3纳米粒子滑移机制的理论研究

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摘要

The need for higher energy efficiency is driving the space conditioning and refrigeration industry toward the use of advanced technologies. Vapor compression cycles work with a mixture of refrigerant and lubricant, and although oil in heat exchangers affects negatively the performances of the system, its presence is unavoidable. The studies of colloidal solutions showed promising results to enhance the heat transfer capabilities of the liquids in which nanoparticles are dispersed, and current experimental research revealed that the increase in thermal conductivity is not enough to explain the enhancements observed in heat transfer. In order to further understand the nanoparticles' contribution to the heat exchange phenomena, this paper analyses slip mechanisms that nanoparticles can be affected by when dispersed in the liquid phase of a high-viscosity oil-refrigerant mixture undergoing evaporation inside a horizontal tube. The study was conducted for Al2O3 nanoparticles dispersed in refrigerant R410A and polyolester (POE) oil at different mass concentrations. Depending on the flow regime, the slip mechanisms related to Brownian motion and thermophoresis were found to provide the largest contributions to nanoparticles' redistribution within the liquid phase of the mixture.
机译：对更高能效的需求正在推动空间调节和制冷工业，以利用先进技术。蒸汽压缩循环与制冷剂和润滑剂的混合物一起使用，尽管热交换器中的油影响了对系统的性能产生负面影响，但其存在是不可避免的。胶体溶液的研究表明，提高纳米颗粒分散的液体的传热能力，以及目前的实验研究表明导热性的增加是不足以解释在热传递中观察到的增强的增加。为了进一步了解纳米颗粒对热交换现象的贡献，本文分析了纳米颗粒可以受到在水平管内蒸发蒸发的高粘度油制冷剂混合物的液相时影响纳米颗粒的滑移机制。在不同的质量浓度下对分散在制冷剂R410A和多元化合物（POE）油中的Al 2 O 3纳米颗粒进行该研究。根据流动状态，发现与褐色运动和热孔相关的滑移机制在混合物的液相内为纳米颗粒再分配提供最大贡献。

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  • 来源
    《Journal of Heat Transfer》 |2019年第7期|072401.1-072401.9|共9页
  • 作者

    Bigi Andrea A. M.; Cremaschi Lorenzo;

  • 作者单位

    Auburn Univ Dept Mech Engn Auburn AL 36849 USA;

    Auburn Univ Dept Mech Engn Auburn AL 36849 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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