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在水平单列铜管管束式的换热实验装置上,研究了含湿气体的流速、水蒸气质量分数、冷却水流量对120℃的常压混合气体的凝结水产率和换热系数的影响,结果表明:混合气体流速和水蒸气质量分数能显著提高凝结水产率和换热系数;冷却水流量增加,凝结水产率和气侧换热系数无明显的增加或减少的趋势,而液侧换热系数明显变大,从而导致总换热系数增加。最后,根据实验研究结果,提出了含湿气体横掠管束的凝结对流传热实验关联式,此公式能较好地将实验值与预测值的偏差控制在10%之内。
The effects of flow rate of moisture-containing gas, mass fraction of water vapor and cooling water flow on the condensate water yield and heat transfer coefficient of atmospheric mixed gas at 120 ℃ were studied on a horizontal single-row copper tube bundle heat exchanger. Results The results show that the mixed gas flow rate and the mass fraction of water vapor can significantly increase the condensate yield and the heat transfer coefficient. The cooling water flow rate increases, the condensate yield and the gas side heat transfer coefficient have no obvious increase or decrease trend, while the liquid side heat transfer coefficient Become larger, resulting in an increase of the total heat transfer coefficient. Finally, based on the experimental results, the experimental correlation of convective heat transfer in a tube bundle containing wet gas is proposed. The formula can well control the deviation between the experimental value and the predicted value within 10%.