压力容器2023，Vol.40Issue(10)：67-74,8.DOI:10.3969/j.issn.1001-4837.2023.10.008
小孔混流折流板换热器壳程传热性能研究
Study of the shell-side heat transfer performance of the heat exchangers with small-hole mixed-flow baffles
吴志伟 1王通 1尹霞 2钱才富1
作者信息
- 1. 北京化工大学 机电工程学院,北京 100029
- 2. 河南金心智能科技有限公司,河南新乡 453011
- 折叠
摘要
Abstract
There exists a"flow dead zone"on the leeward side of traditional heat exchanger with segmental baffles,which will reduce the shell-side heat transfer efficiency.In order to alleviate the effects of the"flow dead zone",a so-called small-hole mixed-flow baffle structure was proposed,and finite element models for the heat exchangers with small-hole mixed-flow baffles were established to find out the effects of position and number of the small holes on the shell-side heat transfer performances of the heat exchangers.Results show that the shell-side fluid will form the jet-flow at the position of the small holes,thus enhancing the degree of turbulence of adjacent fluid,reducing the range of"flow dead zone"and improving shell-side heat transfer efficiency.Within the research scope,as the position of the small holes moves towards the window of the baffles,the shell-side heat transfer enhancement capability generally increases first then decreases.The position of the small holes with strongest shell-side heat transfer enhancement capability is close to the window of the segmental baffles,compared to the conventional baffle heat exchanger without small holes,the Nusselt number is increased by 17.02%,whereas the pressure drop is decreased by 3.58%.In addition,it is found that with the increase of the number of the small holes,the shell-side flow resistance also deceases,but the heat transfer efficiency does not change monotonously.Therefore,there is still a room for optimization design of the heat exchangers with small-hole mixed-flow baffles.关键词
管壳式换热器/弓形折流板/传热系数/传热性能/混流Key words
shell-and-tube heat exchanger/segmental baffle/heat transfer coefficient/heat transfer performance/mixed flow分类
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吴志伟,王通,尹霞,钱才富..小孔混流折流板换热器壳程传热性能研究[J].压力容器,2023,40(10):67-74,8.
