化工学报2011，Vol.62Issue(9)：2484-2489,6.DOI:10.3969/j.issn.0438-1157.2011.09.015
翅片螺距对锯齿螺旋翅片换热管特性的影响
Effects of fin pitch on heat transfer and flow resistance of serrated spiral-finned-tube banks
马有福 1袁益超 1陈昱 1刘海磊 1康明1
作者信息
- 1. 上海理工大学能源与动力工程学院,上海200093
- 折叠
摘要
Abstract
Serrated spiral-finned-tube, developed from solid spiral-finned-tube, has been widely applied in large-scale heat-exchange facility due to its advantages such as easier manufacture, more extended heat transfer surfaces, higher heat transfer coefficient and fin efficiency. For the effects of fin pitch on heat transfer and flow resistance of serrated spiral-finned-tube banks (SSBs) , nine SSBs with staggered layouts in terms of various fin pitch were tested based on the analysis on its influencing mechanism. The experimental results are as follows. At the same fin-side Re, Nu increases 19% and Eu decreases 8% with the fin pitch increased from 3. 831mm to 4.167mm. The effect of fin pitch on fin-side JVm becomes little when the fin pitch is larger than 4 mm since the gas penetrates the fin-gap more easily and fully flushes the fin-surface. The comprehensive heat transfer performance index j/f (ratio of Colburn heat transfer factor and friction factor) of fin-side first increases and then decreases as Re increases, with higher j/f in Re = 7000-10000. At the same fin-side Re, the index j/f is higher as the fin pitch is larger, increased about 28% with the fin pitch increased from 3. 831 mm to 4. 167 mm. The experimental results were compared with the correlations in literature. The correlations for Nu and Eu on SSBs with staggered layouts,which take fin pitch? Transverse pitch and longitudinal pitch of tube banks into accounts* were presented for engineering applications.关键词
强化换热/余热锅炉/换热器/锯齿螺旋翅片管/换热特性/阻力特性Key words
heat transfer enhancement/ HRSG/ heat exchanger/ serrated spiral-finned-tube/ heat transfer characteristics/ flow resistance characteristics分类
能源科技引用本文复制引用
马有福,袁益超,陈昱,刘海磊,康明..翅片螺距对锯齿螺旋翅片换热管特性的影响[J].化工学报,2011,62(9):2484-2489,6.
