【作者】 贾文华； 田茂诚； 张冠敏； 邱燕； 周林林；

【Author】 JIA Wen-hua;TIAN Mao-cheng;ZHANG Guan-min;QIU Yan;ZHOU Lin-lin;School of energy and power engineering,Shandong University;

【机构】 山东大学能源与动力工程学院；

【摘要】 通过数值模拟,研究了不同形状的换热管内含空气的水蒸气在不同不凝气体含量和管径下的换热和流动情况。模拟结果表明:当量直径不变,在圆形换热管、正方形换热管和正三角形换热管内,随着不凝气体含量的增加,流体的换热系数减小,流体流动压降增加;不凝气体含量一定,随着换热管当量直径的增加,正方形、圆形和正三角形换热管内的压降都逐渐减小。小管径下,正方形换热管内压降最小,圆形换热管和正三角形换热管内压降差距不大。随着换热管当量直径的增加,圆形换热管内的压降逐渐减小,且慢慢接近于正方形换热管内的压降情况。更多还原

【Abstract】 Numerical simulation makes use of Fluent software to investigate the heat transfer and flow characteristics of water vapor which contains non-condensable gas under different tube type,non-condensable gas content and tube diameter.The simulation results show that under the same equivalent diameter of the circular tube,square tube and triangular tube,the heat transfer coefficient decreased with the increasing of the content of the non-condensable gas.While the pressure drop increased with the increasing of the content of the non-condensable gas;Under a constant content of non-condensable gas,the fluid pressure drop of the circular tube,square tube and triangular tube decreased with the increasing of the equivalent diameter.The pressure of the circular tube has little difference with that of triangular tube at a small equivalent diameter,while the square tube has the smallest fluid pressure drop.With the increase of the equivalent diameter,the pressure drop of circular tube decreased,and it is close to the pressure drop of the square tube.更多还原