Convection Condensation Heat Transfer of Steam-Air Mixture With Heat Pipe Heat Exchanger
Convection Condensation Heat Transfer of Steam-Air Mixture With Heat Pipe Heat Exchanger
复制标题
DOI：
10.1080/01457632.2013.837649
复制
发表时间：
2014-05
影响因子：
2.3
通讯作者：
Xuehu Ma;Z. Lan;Wei Xu;Chongfeng Zhang;Zheng Fang;Tao Bai
中科院分区：
文献类型：
--
作者：
Xuehu Ma;Z. Lan;Wei Xu;Chongfeng Zhang;Zheng Fang;Tao Bai
利用热管换热器研究了蒸汽体积分数为0~20%，蒸汽-空气混合物入口温度为70~120℃时，蒸汽-空气混合物冷凝的换热性能，并采用正十八烷基硫醇自组装单分子膜(SAMS)对热管冷凝表面进行改性。对比研究了自组装膜对蒸汽-空气混合物蒸汽凝结换热的影响。结果表明，对流凝结换热系数随蒸汽体积分数和蒸汽-空气混合物雷诺数的增大而增大。随着进口温度的升高，换热系数相应减小。SAMS表面可以改善换热性能，在蒸汽体积分数为20%、Re数为1500的条件下，换热强化比可达1.6。
A heat pipe heat exchanger (HPHE) was used to investigate the heat transfer performance of steam-air mixture condensation, analogous to the dew condensation of flue gas, when the steam volume fraction ranged from 0 to 20%, and the inlet temperature of steam-air mixture varied from 70 to 120°C. Self-assembled monolayers (SAMs) treatment with n-octadecyl mercaptan was adopted to modify the condensation surface of the heat pipe. The comparisons were conducted to examine the influence of SAMs on condensation heat transfer of steam-air mixture vapor. The results indicate that the convection condensation heat transfer coefficient increases with the increase of steam volume fraction and Re number of the steam-air mixture. As the inlet temperature increases, the heat transfer coefficient decreases accordingly. The heat transfer performance can be improved by the SAMs surface, with a heat transfer enhancement ratio up to 1.6 at a condition of 20% of the steam volume fraction and 1500 Re number.