管壳式换热器内部流场数值模拟
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摘要
管壳式换热器是应用最广泛的换热器形式,本文采用数值模拟软件分别在3m/s、5m/s、7m/s三种进口流速条件下,对某管壳式换热器内部的流体流动和压力降情况进行了分析。结果表明,在折流板的背压面存在一定的低流速区域,影响了换热器内部空间利用率,通过增加流速的方法虽然可以一定程度上改善这种现象,但会造成压力降的急剧增加,需要采用合理的结构设计以提高换热效率。
Shell and tube heat exchanger is the most used type of heat exchanger. In this article, the fluid filed and pressure drop of a shell and tube heat exchanger are simulated while the inlet velocities of the shell side fluid are 3 m/s、5 m/s and 7 m/s. The results show that there are low velocity areas beside every baffles and it will reduce the coefficient of the heat exchanger. It can be improved by increasing the inlet velocity, but the pressure drop will also increase. Optimizing the structures should be the better method to deal with this problem.
Shell and tube heat exchanger is the most used type of heat exchanger. In this article, the fluid filed and pressure drop of a shell and tube heat exchanger are simulated while the inlet velocities of the shell side fluid are 3 m/s、5 m/s and 7 m/s. The results show that there are low velocity areas beside every baffles and it will reduce the coefficient of the heat exchanger. It can be improved by increasing the inlet velocity, but the pressure drop will also increase. Optimizing the structures should be the better method to deal with this problem.
引文
[1]刘荫泽,张声宝,董威,等.燃气轮机一次表面换热器换热性能计算分析[J].燃气涡轮试验与研究,2017,30(5):53-57.
[2]古新,秦晓柯,王永庆,等.倾斜折流栅式换热器壳程流体流动与传热特性[J].化工进展,2017,36(10):3584-3589.
[3]王珂,刘遵超,刘彤,等.管壳式换热器壳体的高温蠕变有限元分析[J].机械工程材料,2014,38(4):000087-95.
[4]曾文良,邓先和.并流多通道管壳式换热器壳程流场分布比较[J].高校化学工程学报,2013(3):417-424.
[5]曹茹,商跃进.基于SolidWorks Flow Simulation的管壳式换热器传热性能数值仿真[J].热科学与技术,2015,14(4):283-287.
[6]吕金丽,戈锐,李想,等.管壳式换热器壳侧气液两相流动和传热的数值模拟研究[J].汽轮机技术,2012,54(5):345-347.
[2]古新,秦晓柯,王永庆,等.倾斜折流栅式换热器壳程流体流动与传热特性[J].化工进展,2017,36(10):3584-3589.
[3]王珂,刘遵超,刘彤,等.管壳式换热器壳体的高温蠕变有限元分析[J].机械工程材料,2014,38(4):000087-95.
[4]曾文良,邓先和.并流多通道管壳式换热器壳程流场分布比较[J].高校化学工程学报,2013(3):417-424.
[5]曹茹,商跃进.基于SolidWorks Flow Simulation的管壳式换热器传热性能数值仿真[J].热科学与技术,2015,14(4):283-287.
[6]吕金丽,戈锐,李想,等.管壳式换热器壳侧气液两相流动和传热的数值模拟研究[J].汽轮机技术,2012,54(5):345-347.