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首页> 外文期刊>International Journal of Heat and Mass Transfer >The single-blow transient testing technique considering longitudinal core conduction and fluid dispersion
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The single-blow transient testing technique considering longitudinal core conduction and fluid dispersion

机译：考虑纵向岩心传导和流体弥散的单吹瞬变测试技术

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摘要

Single-blow transient testing technique has been widely used to measure the thermal performance of compact heat exchangers. For compact heat exchangers with short length the effect of longitudinal core conduction can usually not be neglected. Furthermore, the flow nonuniformity in a heat exchanger has also a significant influence on its temperature response. A new conduction/dispersion model for the single-blow transient testing technique is developed to include the effects of the longitudinal core conduction and fluid dispersion. Because the axial dispersion coefficient depends on the flow pattern in the heat exchanger which is usually unknown, both the heat transfer coefficient and the axial dispersion coefficient are determined with the whole curve matching simultaneously. The experiments are conducted in an open circuit wind tunnel. Comparison is made between the experimental results and data available in the literature. The software TAlHE (Transient Analysis In Heat Exchangers) developed by the authors is applied to the data analysis to evaluate heat transfer coefficients and axial dispersion coefficients. The results show that the pulse testing technique developed in the present investigation can easily be carried out and gives good evaluated results.
机译：单吹瞬变测试技术已广泛用于测量紧凑型热交换器的热性能。对于短长度的紧凑型热交换器，通常不能忽略纵向芯传导的影响。此外，热交换器中的流动不均匀性也对其热交换器的温度响应有重要影响。开发了一种用于单吹瞬变测试技术的新传导/扩散模型，其中包括纵向岩心传导和流体扩散的影响。由于轴向弥散系数取决于换热器中通常未知的流型，因此，传热系数和轴向弥散系数都是在整个曲线同时匹配的情况下确定的。实验是在开放式风洞中进行的。实验结果与文献中的数据进行了比较。作者开发的软件TAlHE（换热器中的瞬态分析）被用于数据分析，以评估传热系数和轴向弥散系数。结果表明，在本研究中开发的脉冲测试技术可以轻松进行，并给出良好的评估结果。

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