[1]董聪,陈亚平,吴嘉峰,等.周向重叠三分螺旋折流板换热器性能比较[J].东南大学学报(自然科学版),2013,43(4):793-797.[doi:10.3969/j.issn.1001-0505.2013.04.022]
　Dong Cong,Chen Yaping,Wu Jiafeng,et al.Performance comparison of circumferential overlap trisection helical baffle heat exchanger[J].Journal of Southeast University (Natural Science Edition),2013,43(4):793-797.[doi:10.3969/j.issn.1001-0505.2013.04.022]
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周向重叠三分螺旋折流板换热器性能比较()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
43
期数:
2013年第4期
页码:
793-797
栏目:
能源与动力工程
出版日期:
2013-07-20

文章信息/Info

Title:
Performance comparison of circumferential overlap trisection helical baffle heat exchanger
作者:
董聪; 陈亚平; 吴嘉峰; 操瑞兵
东南大学能源与环境学院, 南京210096; 东南大学能源热转换及其过程测控教育部重点实验室, 南京210096
Author(s):
Dong Cong;  Chen Yaping;  Wu Jiafeng;  Cao Ruibing
School of Energy and Environment, Southeast University, Nanjing 210096, China
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
关键词:
螺旋折流板换热器;  三分折流板;  四分折流板;  连续折流板;  相邻折流板周向重叠
Keywords:
helical baffle heat exchanger;  trisection baffle;  quadrant baffle;  continuous baffle;  circumferential overlap of adjacent baffles
分类号:
TK124
DOI:
10.3969/j.issn.1001-0505.2013.04.022
摘要:
对采用正三角形布管且螺距相同的4种螺旋折流板换热器方案,即倾斜角为20°三分周向重叠(20°TCO)、倾斜角为18°四分周向重叠(18°QCO)、倾斜角为18°首尾相连(18°QEE)以及螺旋角为18.4°的连续(18.4°CH)螺旋折流板换热器的流动和传热性能进行数值模拟.给出了子午切面、同心正六边形切面上速度矢量叠加压力或速度云图分布以及60°扇区的9根换热管和4层同心换热管层的局部热流密度分布.结果表明:每个螺旋周期中均存在二次流,非连续螺旋折流板V形缺口处存在“逆向泄漏”,但4种方案中20°TCO方案泄漏量最少;20°TCO方案具有最大壳侧传热因子jo、摩擦系数fo和平均综合性能指标(jo/fo);18°QCO方案中的传热因子jo和摩擦系数fo其次;虽然18.4°CH方案摩擦系数fo最低,但其壳侧传热因子jo和平均综合性能指标(jo/fo)均最差.
Abstract:
Numerical simulation of flow and heat transfer performances were conducted in respect for four helical baffle heat exchangers with identical equilateral triangle tube layout and approximate spiral pitch but different baffle shapes and assembly configurations, i.e., a trisection circumferential overlap baffle scheme with the baffle incline angle of 20°(20°TCO), a quadrant circumferential overlap baffle scheme with the baffle incline angle of 18°(18°QCO), a quadrant end-to-end baffle scheme with the baffle incline angle of 18°(18°QEE), and a continuous helical baffle scheme with the baffle helix angle of 18.4°(18.4°CH). The velocity-vector superimposed pressure or velocity nephograms meridian slices and the unfolded concentric hexagonal slices and the curves of local average heat fluxes on nine heat transfer tubes within a 60° sector region and on the four concentric heat transfer tube layers were presented. The results show that each baffle chamber contains secondary flow and there exists reverse leakage at the V-notch region, but the leakage of 20°TCO scheme is the least of the four schemes. Among the four schemes, the 20°TCO scheme has the highest shell-side heat transfer factor jo, friction coefficient fo and average comprehensive index(jo/fo); the 18°QCO scheme has the second highest values of both shell-side heat transfer factor joand friction coefficient fo; although, the 18.4°CH scheme has the lowest shell-side friction coefficient fo, its shell-side heat transfer factor jo and average comprehensive index(jo/fo)are the lowest.

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相似文献/References:

[1]李彦晴,陈亚平,刘化瑾,等.三分螺旋折流板换热器壳侧换热系数的关联式[J].东南大学学报(自然科学版),2010,40(1):149.[doi:10.3969/j.issn.1001-0505.2010.01.028]
　Li Yanqing,Chen Yaping,Liu Huajin,et al.Correlation equation of heat transfer coefficient at shell-side of trisection baffled helix heat exchangers[J].Journal of Southeast University (Natural Science Edition),2010,40(4):149.[doi:10.3969/j.issn.1001-0505.2010.01.028]

备注/Memo

备注/Memo:
作者简介: 董聪(1982—),男,博士生;陈亚平(联系人),男,博士,教授,博士生导师,ypgchen@sina.com.
基金项目: 国家自然科学基金资助项目(50976022,51276035)、江苏省科技创新与成果转化专项引导资金资助项目(BY2011155).
引文格式: 董聪,陈亚平,吴嘉峰,等.周向重叠三分螺旋折流板换热器性能比较［J］.东南大学学报:自然科学版,2013,43(4):793-797. ［doi:10.3969/j.issn.1001-0505.2013.04.022］
更新日期/Last Update: 2013-07-20