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高压下打孔翅片通道内的流动换热性能

发表时间:2017-07-31  浏览量:57  下载量:19
全部作者: 康蕊,厉彦忠,杨永斌,杨宇杰
作者单位: 西安交通大学能源与动力工程学院
摘 要: 采用数值模拟方法研究高压下打孔板翅式换热器翅片通道内的流动换热性能。首先,分析高压下打孔翅片通道内流动换热性能的变化规律,结果显示,换热因子j和摩察因子f均随翅片厚高比的增加而减小,随翅片密度的增加先减小后增大。其次,拟合高压下打孔翅片通道内j、f因子的预测关系式,并将通过预测关系式计算所得的j、f因子与文献中的实验值对比。对比结果显示,本文的预测关系式可以较好地预测较广范围内不同结构打孔翅片通道内的流动换热性能。最后,评价高压下打孔翅片通道内的强化换热性能。
关 键 词: 制冷与低温工程;打孔翅片;流动换热性能;性能评估;相对熵产分布因子
Title: Fluid flow and heat transfer behaviors of perforated fins channels at high pressure
Author: KANG Rui, LI Yanzhong, YANG Yongbin, YANG Yujie
Organization: School of Energy and Power Engineering, Xi’an Jiaotong University
Abstract: In order to design and optimize the plate-fin heat exchanger, the thermal hydraulic performances of perforated fin-channels are investigated numerically under higher pressure. Firstly, the general behavior of flow and heat transfer in perforated fin channels are analyzed. The results show that higher thickness-to-height ratio of fin causes a considerable reduction in heat transfer performance of perforated fin, there exist optimum fin density which contribute to peak performance. Secondly, Based on the analysis of a large amount of numerical data, general correlations of heat transfer factor j and friction factor f are developed, then comparing the value of the j and f factors between experiental value and numerical simulation results. It is found that the proposed correlations predict 90% of the j data and 95% of the f data within ±20% under laminar flow, and the proposed correlations predict 92% of the j data and 96% of the f data within ±20% under turbulent flow. Finally, the performance of heat transfer enhancement of perforated fins is evaluated.
Key words: refrigeration and cryogenics engineering; perforated fins; thermal hydraulic performance; performance evaluation; relative entropy production distribution factor
发表期数: 2017年7月第14期
引用格式: 康蕊,厉彦忠,杨永斌,等. 高压下打孔翅片通道内的流动换热性能[J]. 中国科技论文在线精品论文,2017,10(14):1580-1594.
 
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