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首页> 外文期刊>Heat Transfer Engineering >Heat Transfer in High Moisture Content Gas Flow Across a Cylinder at Moderate Reynolds Numbers
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Heat Transfer in High Moisture Content Gas Flow Across a Cylinder at Moderate Reynolds Numbers

机译：高水分含量的气体在中等雷诺数下穿过汽缸的传热

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摘要

The average Nusselt number for the flow of a mixture of air and vapor across a tube was measured at moderate Reynolds numbers (2000～7000) for temperatures from 300 to 700℃ and for humidity ratios from 0.22-0.54. Results are also presented for flow over a set of three tubes aligned perpendicular to the flow for the same range of conditions. The effects of humidity ratio and temperature on the convection coefficients were investigated to develop a modified Nusselt number correlation describing the heat transfer over the tubes. The results showed that the Nusselt number increased as the humidity ratio increased and that the increase was more than could be accounted for by typical models for the property variations of mixtures. The Nusselt number data were correlated with an equation that included both a Prandtl number ratio and a thermal conductivity ratio to correlate the multiple property variations due to both the large temperature variations and the large humidity variations. The exponent of the thermal conductivity ratio used in the modified correlation to correlate the additional effects of the property variations due to the large humidity variations was 0.073 for the entire data set, indicating the importance of the property variation due to the moisture content.
机译：在300到700℃的温度和0.22-0.54的湿度比下，在中等的雷诺数（2000〜7000）下测量空气和蒸汽混合物穿过管的平均努塞尔数。还给出了在相同条件范围内垂直于流量排列的一组三个管中流量的结果。研究了湿度比和温度对对流系数的影响，以开发出描述管内传热的修正Nusselt数相关性。结果表明，随着湿度比的增加，Nusselt数增加，并且这种增加超过了混合物性质变化的典型模型所能解释的程度。 Nusselt数数据与一个既包含Prandtl数比又包含热导率的方程式相关联，以将由于大的温度变化和大的湿度变化而引起的多种特性变化相关联。对于整个数据集，在修改的相关性中用于关联由于大的湿度变化而导致的特性变化的附加影响的导热系数的指数为0.073，这表明由于水分含量而导致的特性变化的重要性。

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