含湿气体横掠管束的凝结对流换热实验研究  

Experimental Study of the Condensing Convection Heat Transfer of a Humidified Gas Laterally Sweeping Across a Tube Bundle

作　　者：李俊[1] 吴新[1] 王帅[1] 刘宣义[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《热能动力工程》2015年第2期222-227,318-319,共6页Journal of Engineering for Thermal Energy and Power

基　　金："十二五"国家科技支撑计划资助项目(2012BAA02B01-02)

摘　　要：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。On a horizontal single-row copper tube bundle type heat exchange test rig,studied was the influence of the flow speed,steam mass fraction and cooling water flow rate on the condensate water production capacity and heat exchange coefficient of a hybrid gas at normal pressure at 120 ℃. It has been found that the flow speed and steam mass fraction of the hybrid gas can notably enhance the condensate water production capacity and heat exchange coefficient. To increase the cooling water flow rate has no conspicuous tendency to increase or decrease the condensate water production capacity and the heat exchange coefficient at the gas side,however,the heat exchange coefficient at the liquid side becomes bigger obviously,thus leading to an increase of the overall heat exchange coefficient. Finally,according to the test and research results,a condensing convection heat transfer experimental correlation formula for humidified gas laterally sweeping across a tube bundle was proposed and the formula under discussion can control relatively well the deviation between the test value and the prediction one within a range of 10%.

关 键 词：含湿气体 管束 凝结水产率 换热系数 

分 类 号：TK[动力工程及工程热物理]