化工学报2011，Vol.62Issue(12)：3352-3360,9.DOI:10.3969/j.issn.0438-1157.2011.12.007
并流多通道管壳式换热器壳程流场分布
Shell-side fluid flow field in shell-and-tube heat exchanger with multi-parallel-channel
摘要
Abstract
The decrease in length-diameter ratio may lead to some technical problems in shell-and-tube heat exchangers, such as fluid flow maldistribution, sharp increase of pressure drop, and performance deterioration. In order to solve above problems, two techniques are proposed in this study, application of a novel structure of multi-parallel-channel inlet/outlet (MPC) and installation of fluid flow distributors (FDBs) in the region of inlet/outlet in shell-side. The shell-side fluid flow is simplified according to its structural characteristics and the unit duct model is established. By employing commercial CFD software of FLUENT 6. 3, the numerical investigation on shell-side fluid flow was carried out. The numerical model and method were confirmed by experiment. Without FDBs and with FDBs of different punching ratios, both shell-side velocity distribution and resistance were investigated with different values of Reynolds number and number of tube rows (N). Without FDBs, as N decreases, the distribution of shell-side is effectively improved and the resistance is reduced sharply, with more than 70% of total pressure drop reduced when N decreases from 11 to 7 at the same Re. FDBs improve the shell-side fluid distribution effectively, but increase the shell-side pressure drop. The comparison shows that the fluid flow distributor with the best fluid flow distribution gives the largest pressure drop, about 10%-12% larger than that without FDB and about 4%-6% larger than that with other two FDBs. The largest pressure drop of shell side is generated in the regions of inlet and outlet.关键词
流场分布/压降/并流多通道/管壳式换热器Key words
flow field distribution/ pressure drop/ multi-parallel-channel/ shell-and-tube heat exchanger分类
化学化工引用本文复制引用
曾文良,邓先和..并流多通道管壳式换热器壳程流场分布[J].化工学报,2011,62(12):3352-3360,9.基金项目
湖南省自然科学基金项目(10JJ9021) （10JJ9021）
国家自然科学基金项目(20776046). （20776046）
