摘要
实验研究了安装有平板及45°平板扰流内构件的管式换热器传热与压降特性,结果表明:管内插入平板和45°平板扰流内构件时,换热器传热性能和压降特性随扰流内构件组数N和Re的增加而增大;当Re≥2.6×104时,换热器压降增加比较显著;当N>6时,平板内构件换热器传热性能强化稍优于45°平板内构件换热器,但是压降明显较大;两种内构件组数不宜超过9组。在实验研究范围内,平板和45°平板内构件换热器传热性能分别是空管换热器的1.66~3.47倍和1.67~3.38倍,压降分别是空管换热器的6.25~29.57倍和3.61~10.77倍。Re在1.9×104左右时,平板和45°平板综合性能评价因子达到最大,分别约为1.24和1.57,说明45°平板内构件换热器综合性能优于平板内构件换热器。随后进一步采用数值模拟方法对换热器的传热和流动特性进行了模拟,结果表明:有角度平板可以使流场旋转产生二次流动,强化了传热,降低了换热器压降的增幅。因此,将有角度的内构件插入管式换热器中可有效增加换热器的综合传热性能。
The heat transfer and pressure characteristics of a tube heat exchanger （THE） with plates and 45° plate inserts have been studied. The results show that both these characteristics improve with increasing number of insert groups （N） and Reynolds number （Re）. When Re is greater than or equal to 2.6 × 104, the pressure increases significantly. When N is higher than 6, the heat transfer performance of THE with plates is slightly better compared to that with 45° plates, while the pressure performance is significantly increased. However, the best effects are ob- tained by restricting the number of insert groups to no more than 9. The results also show that the heat transfer per- formance of the THE with plates and 45° plates is respectively 1.66-3.47 times and 1.67 -3.38 times that of a THE without inserts, while the performance enhancement in terms of pressure is 6.25 -29.57 times and 3.61 - 10.77 times, respectively. When Re is in the region of 1.9 × 104 , the maximum comprehensive evaluation factor （ηmax） for plates and 45° plates is about 1.24 and 1.57, respectively, showing that the performance of the 45° plate heat exchanger is better. In a further study, a numerical simulation method is used to simulate the heat trans- fer and flow characteristics. The results show that a secondary flow in a THE with angled plates can be produced due to the rotation of the flow field, and the heat transfer is enhanced while the enhancement of pressure is de- creased. Consequently, the presence of angled inserts can effectively enhance the heat transfer performance of a THE.
作者
任国瑜
刘晓菊
李晶
闫龙
亢玉红
李健
初广文
陈建峰
谢海燕
REN GuoYu1,2 LIU XiaoJu1, LI Jing3, YAN Long1, KANG YuHong1, LI Jian1, CHU GuangWen2, CHEN JianFeng2, XIE HaiYan4(1. Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School of Chemistry and Chemical Engineering, Yulin University Yulin, Shaanxi 719000; 2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029; 3. Xi＇an Tap Water Co. , Ltd. , Xi＇an 710082; 4. Pipeline Transport First Branch, Shaanxl Yanehang Petroleum Co. ,Ltd. , Jingbian, Shaanxi 718500, Chin)
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第2期23-30,共8页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
陕西省教育厅研究项目(17JS148)
陕西省重点实验室开放基金(2014SKL-DBM001)
榆林市科技局项目(2016CXY-07)
关键词
管式换热器
45°平板内构件
综合性能评价因子
数值模拟
tube heat exchanger
45° plate insert
comprehensive performance evaluation factor
numerical simu- lation
