化工进展 ›› 2016, Vol. 35 ›› Issue (04): 1042-1046.doi: 10.16085/j.issn.1000-6613.2016.04.012

• 化工过程与装备 • 上一篇    下一篇

高低双螺旋片强化套管换热器壳侧换热

李雅侠1, 张腾1, 张春梅1, 张丽2, 吴剑华1   

  1. 1. 沈阳化工大学能源与动力工程学院, 辽宁 沈阳 110142;
    2. 沈阳化工大学化学工程学院, 辽宁 沈阳 110142
  • 收稿日期:2015-10-08 修回日期:2015-11-12 出版日期:2016-04-05 发布日期:2016-04-05
  • 通讯作者: 吴剑华,教授,博士生导师.E-mail:syhgdx_wjh@163.com. E-mail:syhgdx_wjh@163.com
  • 作者简介:李雅侠(1977-),女,博士,副教授,研究方向为流体流动、传热及过程强化.
  • 基金资助:
    国家自然科学基金(51506133)、辽宁省教育厅项目(L2014165)及辽宁省博士科研启动基金项目(20141085).

Heat transfer enhancement on shells of double-pipe exchanger with double helix fins

LI Yaxia1, ZHANG Teng1, ZHANG Chunmei1, ZHANG Li2, WU Jianhua1   

  1. 1. College of Energy and Power Engineering, Shenyang University of Chimerical Technology, Shenyang 110142, Liaoning, China;
    2. College of Chemical Engineering, Shenyang University of Chimerical Technology, Shenyang 110142, Liaoning, China
  • Received:2015-10-08 Revised:2015-11-12 Online:2016-04-05 Published:2016-04-05

摘要: 采用实验和数值模拟相结合的方法,研究了高低双螺旋片对套管换热器壳侧的强化换热效果.以仅带有高螺旋片的换热器结构为基础,研究了曲率ε分别为0.44、0.321和0.131时,Reynolds数在4000~20000范围内,低、高螺旋片高度之比l/W对壳侧换热平均Nusselt数Num和流动阻力系数f的影响,考察了等泵功条件下换热器的综合传热性能.对ε=0.44的换热器研究结果表明:当l/W>1/2时双螺旋片强化传热效果显著,且研究工况中l/W=3/4时最优,此时与单一高螺旋片相比,Num值平均提高了10.8%;研究范围内,综合强化传热因子PEC数在1.044~1.204.对不同曲率换热器的研究结果表明,同一l/W值下,PEC数随着曲率ε值的增大而增大,说明双螺旋片结构更适合强化曲率较大的套管换热器壳侧换热.

关键词: 双螺旋片, 强化传热, 套管换热器, 数值模拟

Abstract: Experimental and numerical methods were adopted to study the heat transfer enhancement effect for double-pipe exchangers by installing high and low double strand helix fins on the outer wall of inner tube. The double-pipe heat exchanger with single high helical fin was treated as referenced structure. The curvature ratios were set to 0.44, 0.321 and 0.131 and the Reynolds number was in the range of 4000 to 20000. The impact of the ratio of low to high helical fin heights on the average Nusselt number of shell wall Num and flow resistance coefficient f were studied. The comprehensive heat transfer performances of heat exchanger were examined at the same pump power condition. The study on heat exchanger with ε=0.44 showed that enhanced heat transfer effect was distinct when l/W value is greater than 1/2. The condition of l/W=3/4 is an optimal plan. For this case, the Num of heat exchanger with double helical fins was improved by 10.8 percent on average compared to that of single high fins. PEC values are in the range of 1.044 to 1.204 within the researched scope. The study on heat exchangers with different ε values showed that PEC values are raised with the increases of curvature ratio ε at the same l/W values, which indicates that low and high double helical fins are more suitable to double-pipe exchangers with larger curvature ratio.

Key words: double stranded helix fins, heat transfer enhancement, double-pipe heat exchanger, numerical simulation

中图分类号: 

  • TK172