中南大学学报（自然科学版）2016，Vol.47Issue(6)：2133-2140,8.DOI:10.11817/j.issn.1672-7207.2016.06.042
倾斜角对周向重叠三分螺旋折流板换热器性能的影响
Impacts of incline angle on performances of circumferential overlap trisection helical baffle heat exchangers
摘要
Abstract
The six circumferential overlap trisection helical baffle shell-and-tube heat exchangers (cothSTHXs) with single thread but baffle incline angles of 16°, 20°, 24°, 28°, 32° (16°CO, 20°CO, 24°CO, 28°CO, 32°CO) as well as double thread and baffle incline angle of 32° (2-32°CO), as opposed to a segment baffle heat exchanger, were numerically simulated and compared with the available experimental data. Local parameter distributions of the velocity vectors or pressure contours plus velocity vectors on special sections were plotted and analyzed. The results show that the simulation results are satisfactory and in agreement with tests. The Dean Vortex secondary flow and bypass leakage between adjacent baffles in the spiral channel play essential roles in the heat transfer enhancement of the cothSTHXs. The shell-side heat transfer coefficient decreases with the increase of incline angle at the same shell-side flow rate. The optimum scheme is 20°CO, and its shell-side heat transfer coefficient is the highest and Dean Vortex secondary flow in the spiral channel is strong at the same shell-side pressure drop. Nevertheless, the worst scheme is the segment baffle one, and there exist stagnant zones in the channel, whose shell-side pressure drop is much higher than those of other cothSTHXs schemes, and so its shell-side heat transfer coefficient is the lowest at the same shell-side pressure drop. The shell-side heat transfer coefficient of segment baffle scheme ranks the third, only 16°CO and 20°CO schemes exhibit better in terms of shell-side heat transfer coefficient.关键词
三分螺旋折流板换热器/倾斜角/周向重叠/二次流/缺口泄漏/相邻折流板/数值模拟Key words
trisection helical baffle heat exchanger/incline angle/circumferential overlap/secondary flow/bypass leakage/adjacent baffles/numerical simulation分类
能源科技引用本文复制引用
董聪,陈亚平,吴嘉峰..倾斜角对周向重叠三分螺旋折流板换热器性能的影响[J].中南大学学报（自然科学版）,2016,47(6):2133-2140,8.基金项目
国家自然科学基金资助项目(51276035，51206022)；江苏省科技创新与成果转化专项引导资金资助项目(BY2011155)(Projects(51276035,51206022) supported by the National Natural Science Foundation of China （51276035，51206022）
Project(BY2011155) supported by the Provincial Science and Technology Innovation and Transformation of Achievements Special Fund Project of Jiangsu Province) （BY2011155）
