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本文通过分析作者和国内外文献有关低沸点工质在水平螺旋翅片管内蒸发换热特性实验数据,讨论了热流密度、质量干度和质量流速对局部换热系数的影响,并将实验数据与现有的螺旋翅片管换热关系式的计算值进行比较,结果表明,Kandlikar的关系式具有明确的流动沸腾换热机制及一定的计算精度.为提高其通用性和计算精度,本文提出了进一步改进Kandlibar关系式的具体设想.从而为优化设计螺旋翅片管、研制高效蒸发强化管提供了理论计算依据.
In this paper, by analyzing the author and the domestic and foreign literature on the experimental data of the evaporation heat transfer characteristics of low-boiling point working fluid in horizontal spiral finned tubes, the effects of heat flux density, mass dryness and mass flow rate on the local heat transfer coefficient are discussed. The results of the existing heat transfer equation of spiral finned tube are compared. The results show that the Kandlikar equation has a clear mechanism of flow boiling heat transfer and some calculation accuracy. In order to improve its versatility and computational accuracy, this paper proposes a concrete idea to further improve Kandlibar’s relation. So as to optimize the design of spiral finned tubes, the development of highly efficient evaporative tube provides a theoretical basis.