三叶孔板换热器周期性充分发展段界定.pdfVIP

第30 卷第3 期 高 校 化 学 工 程 学 报 No.3 Vol.30 2016 年 6 月 Journal of Chemical Engineering of Chinese Universities June 2016 文章编号：1003-9015(2016)03-0554-06 三叶孔板换热器周期性充分发展段界定 1 2 1 古 新 , 潘国华 , 王 珂 (1. 郑州大学 河南省过程传热与节能重点实验室, 河南 郑州 450002; 2. 天津渤化永利化工股份有限公司, 天津 300452) 摘 要：为了研究三叶孔板换热器壳程周期性充分发展段的范围，利用数值模拟分析对其整体模型的壳程进行流动及 传热研究：从定义出发，分别以速度、压降及无因次温度为研究对象在不同 Re 下界定壳程的周期性充分发展段段。 在研究范围中发现：周期段的区间从第二块支撑板开始到最后一块支撑结束；在相同流量下，壳程流体在支撑板处的 流体速度明显高于其他截面速度。几何段压力降随着壳程Re 的增大而随之增大。 关键词：三叶孔板支撑；周期性充分发展；数值模拟；换热；流动 中图分类号：TK124 文献标识码：A DOI ：10.3969/j.issn.1003-9015.2016.03.008 Identification of Fully Developed Periodic Regions of Trefoil-Baffle Heat Exchangers GU Xin1 2 1 , PAN Guo-hua , WANG Ke (1. Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou 450002, China; 2. Tianjin Bohua Yongli Chemical Co. Ltd, Tianjin 300452, China) Abstract: The range of fully developed periodic regions in trefoil-baffle heat exchangers was numerical simulated to study fluid flow and heat transfer in shell side of the whole-body model. Factors including velocity, pressure gradient and dimensionless temperature were used to determine the length of fully developed periodic segment in shell-side under different Reynolds numbers. The results show that the length starts from the second support plate and ends at the last support plate. The velocity of the shell-side fluid passing the support plate is obviously higher than that passing others region