江苏大学学报（自然科学版）2016，Vol.37Issue(3)：277-282,6.DOI:10.3969/j.issn.1671-7775.2016.03.005
斜日字布管螺旋折流板电加热器热力性能数值模拟
Numerical simulation on thermal performance of helical baffled electric heaters with one-plus-two U-tube units
摘要
Abstract
To overcome the defects of low heat transfer coefficient and non-uniform tube spacing in conventional multi-ring-annular U-tube layouts of segment baffled electric heaters,the novel helical baffled electric heaters with one-plus-two U-tube units were designed with equilateral triangle tube layouts.Numerical simulation and comparison of the flow and heat transfer performance and the surface temperature uniformity were performed for five helical baffled electric heaters and two segment baffled ones.Each helical baffled scheme comprises of nine one-plus-two U-tube units with altogether 27 1 6 mm U-tubes supported by trisection helical baffles with 1 5°or 20°inclined angle,and each segment baffled scheme comprises of 30 1 6 mm U-tubes of two-ring annular layout supported by segment baffle plates spanned either 200 mm or 300 mm.The calculation results with fluid of compressed nitrogen show that the average temperature and the highest temperature of heating surface of 1 5°trisection helical baffles are reduced respectively by 31 .7 K and 50.7 K,and the average heat transfer coefficient and the comprehensive index h·Δp -1 /3 are increased respectively by 68.2% and 34.3% than those of segment baffle plate scheme.The effective heating area of 1 5°inclined angled trisection helical baffle electric heater is only 68.5% of that of segment baffled one with baffle plate span of 200 mm.关键词
三分螺旋折流板/电加热器/斜日字布管/热力性能模拟/综合指标/温度均匀性Key words
trisection helical baffles/electric heater/one-plus-two U-tube units/thermal performance simulation/comprehensive index/temperature homogeneity分类
能源科技引用本文复制引用
王明超,陈亚平,吴嘉峰,董聪..斜日字布管螺旋折流板电加热器热力性能数值模拟[J].江苏大学学报（自然科学版）,2016,37(3):277-282,6.基金项目
国家自然科学基金资助项目 （）
