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首页> 外文期刊>International Journal of Heat and Mass Transfer >Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part II-heat transfer
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Transitional flow inside enhanced tubes for fully developed and developing flow with different types of inlet disturbances: Part II-heat transfer

机译：增强管内部的过渡流，用于在不同类型的入口扰动下充分发展和发展的流动：第二部分-传热

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摘要

Due to efficiency demands, augmented tubes are often used in heat exchangers with the result that many heat exchangers operate in the transitional region of flow. Due to the paucity of data, however, no data exists for enhanced tubes in this region. This article, being the second of a two-part paper (Part Ⅰ investigating adiabatic flow), presents experimental heat transfer and diabatic friction factor data for four horizontal enhanced tubes for fully developed and developing flow in the transition region with four different types of inlet geometries. Smooth tube data was used for comparison. It was found that, unlike results obtained for adiabatic flow in Part Ⅰ, inlet disturbances had no effect on the critical Reynolds numbers, with transition occurring at a Reynolds number of approximately 2000 and ending at 3000. Correlations were developed to predict the heat transfer and friction factors for a wide range of flow regimes, from laminar to turbulent flow. The correlations predicted the heat transfer data on average with a mean absolute error of 9.5％, predicting 85％ of the data to within 15％. The friction factor correlations predicted the data with a mean absolute error of 5.5％, predicting 96％ of the data to within 20％.
机译：由于对效率的需求，在热交换器中经常使用增强管，结果许多热交换器在流动的过渡区域中工作。然而，由于缺乏数据，在该区域没有增强管的数据。本文是由两部分组成的论文的第二部分（研究绝热流动的第一部分），介绍了四个水平增强管的传热和绝热摩擦系数数据，用于在四种不同入口类型的过渡区域中充分发展和发展的流动中几何形状。光滑管数据用于比较。结果发现，与第一部分绝热流动的结果不同，入口扰动对临界雷诺数没有影响，在雷诺数约为2000且终止于3000时发生了跃迁。从层流到湍流的各种流动状态的摩擦系数。相关性平均预测传热数据，平均绝对误差为9.5％，预测数据的85％在15％以内。摩擦因数相关性预测数据的平均绝对误差为5.5％，预测数据的96％在20％以内。

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