摘要
建立了板翅式换热器封头结构的湍流数学模型 ,并采用此模型对目前工业中应用的基本型封头内部的速度场分布进行了数值计算 ,计算结果表明 :封头内部物流分配存在严重的不均匀性 ,同时发现改变封头的结构可以有效地改善换热器内部的物流分配 .在此基础上对两种改进型封头结构进行了数值模拟 ,计算结果表明改进效果明显 ,在进口Reynolds数为 830 0 0时绝对不均匀度已从3.4 7减小到 0 .71.计算结果与实验结果吻合良好 .
A computational fluid dynamics (CFD) program FLUENT has been used to predict the fluid flow distribution in plate-fin heat exchanger. It is found that the fluid flow maldistribution is very serious in the direction of header length for the conventional header used in industry. Based on the analysis of the fluid flow maldistribution, two improved headers with a two-stage distributing configuration are recommended and predicted by CFD. The predictions indicate that the improved header configuration can effectively improve the performance of fluid flow distribution in the heat exchanger. The absolute degree of fluid flow nonuniformity in plate-fin heat exchanger has reduced from 3.47 to 0.71 by changing the header configuration. The computational results are in good agreement with experimental ones, which indicates that the CFD technology is capable of closely predicting the fluid flow distribution in plate-fin heat exchanger.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2002年第11期1182-1187,共6页
CIESC Journal
基金
全国首届优秀博士学位论文作者专项基金资助项目(No .19993 3 )
