摘要
增大总传热系数和减小压降是当前研究改善板式换热器性能主要关注的两个方向。为分析导流区结构对板式换热器传热、压降以及场协同关系的影响效果,建立两种板式换热器计算模型。利用计算流体力学(Computational fluid dynamics,CFD)软件对两种板式换热器模型内流体不同工况下的流动和传热特性进行数值模拟,对比分析了两种模型流道内的速度场、温度场和压力场以及各场间协同性,并利用强化换热综合性能指数(Performance evaluation criteria,PEC)进行评价。结果表明:新型导流区使板式换热器板间流体的速度场与温度场分布更均匀,压降阻力减少,其综合性能更优。同时,场协同理论分析也表明,新型导流区改善了速度与压力场的协同关系。该新型板式换热器导流区设计对于提高板式换热器性能具有指导意义。
Improving plate heat exchanger＇s performance by increasing the overall heat transfer, as well as minimising pressure drop is one of the promising fields of research to focus on. In order to analyze the effects of distribution region construction on heat transfer, pressure drop performance and field synergy of plate heat exchanger, the two calculation models for plate heat exchanger is established. The flow and heat transfer characteristics of plate heat exchanger are simulated with computational fluid dynamic software. The velocity, temperature and pressure field of two models and their synergy relationship are compared and analyzed in the various conditions. At the same time, the enhanced heat transfer performances of plate heat exchanger are evaluated detailedly by performance evaluation criteria （PEC）.The results show that the uniformity temperature field and better pressure drop effect is got for plate heat exchanger with new distribution region, and its general performances are better than traditional plate heat exchanger. Based on field synergy principle, the synergy between both pressure field and velocity field is improved by distribution region construction. The developed new distribution region of plate heat exchanger can be used for designing of plates with geometry.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2017年第6期145-151,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51476025)
关键词
板式换热器
导流区
数值模拟
场协同
plate heat exchanger
distribution region
numerical simulation
field synergy
