弯曲内肋换热管综合换热性能的数值模拟

化工进展 ›› 2015, Vol. 34 ›› Issue (s1): 35-42.

弯曲内肋换热管综合换热性能的数值模拟

曹海亮, 黄丹, 贾宝光, 苏航, 年志远, 王定标

郑州大学化工与能源学院, 河南郑州 450001

出版日期:2015-09-20 发布日期:2015-10-20
通讯作者: 曹海亮(1976—),男,博士,副教授,主要从事过程工程节能技术及高效装备研究等工作。E-mail caohl@zzu.edu.cn。
作者简介:曹海亮(1976—),男,博士,副教授,主要从事过程工程节能技术及高效装备研究等工作。E-mail caohl@zzu.edu.cn。
基金资助:
国家自然科学基金(51176174)及河南省教育厅科学技术研究重点项目(13A470457)。

Numerical simulation of overall heat transfer performance of the rolled curved ribbed tube

CAO Hailiang, HUANG Dan, JIA Baoguang, SU Hang, NIAN Zhiyuan, WANG Dingbiao

School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, China

Online:2015-09-20 Published:2015-10-20

摘要/Abstract

摘要： 基于纵向涡强化换热理论提出了新型的强化换热管——弯曲内肋强化换热管。运用数值计算的方法,在Re=500～40000研究了新型强化换热管结构参数肋宽a、导程p、肋深e和Re数对Nu、f及换热性能评价指标PEC的影响,并拟合出换热管Nu、f的量纲为1关联式。结果表明:由于内肋的作用,在换热管的近壁面区域能够有效诱导产生沿纵向的涡旋结构,破坏壁面边界层,实现强化换热;导程p和肋深e对综合换热性能影响较大,肋宽a对综合换热性能影响较小,在Re=500～40000范围内,新型换热管较优的结构参数为p=10mm、e=0.6mm、a=1.8mm;与普通平滑圆管相比,当Re<2300,其换热性能Nu可达到普通圆管的2.9～7.0倍,沿程阻力系数f约为普通圆管的1.4～3.6倍;当500< Re <2300,其综合换热评价指标PEC可以达到2.6～4.6;当2300 <Re <40000时,其PEC可以达到1.2～2.3。

关键词: 强化传热, 纵向涡, 计算流体力学, 数值模拟

Abstract: Based on the enhanced heat transfer theory of longitudinal vortex, a novel enhanced heat transfer tube - rolled curved ribs tubes is developed.The influence of its structural parameters including rib width a, lead p, rib deep e and Re on Nu, f and the overall heat transfer performance evaluation criterion(PEC) value is studied numerically in different Re from 500 to 4×10⁴, and the dimensionless correlations of Nu, f are finally obtained.The results show that a strong vortex in the longitudinal direction of the spiral is induced in the near-wall region due to the presence of the ribs, which could break boundary, in turn achieved a heat transfer enhancement.lead p and rib deep e have bigger influence than rib width a in the overall heat transfer performance; the better geometric parameters of the new tube are p=10mm,e=0.6mm,a=1.8mm.When Re<2300, the Nu of the rolled curved ribs tube can be 2.9—7.0 times than that of the smooth circular tube, correspondingly, frictional loss factor is about 1.4—3.6 times than that of the smooth circular tube.When 500< Re <2300, the overall heat transfer performance evaluation criterion (PEC) value can reach up to 2.4—4.6, and when the 2300< Re <40000, it can reach 1.2—2.3.

Key words: enhanced heat transfer, longitudinal vortices, computational fluid dynamics, numerical simulation

曹海亮, 黄丹, 贾宝光, 苏航, 年志远, 王定标. 弯曲内肋换热管综合换热性能的数值模拟[J]. 化工进展, 2015, 34(s1): 35-42.

CAO Hailiang, HUANG Dan, JIA Baoguang, SU Hang, NIAN Zhiyuan, WANG Dingbiao. Numerical simulation of overall heat transfer performance of the rolled curved ribbed tube[J]. Chemical Industry and Engineering Progree, 2015, 34(s1): 35-42.

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