化工进展2016，Vol.35Issue(4)：1042-1046,5.DOI:10.16085/j.issn.1000-6613.2016.04.012
高低双螺旋片强化套管换热器壳侧换热
Heat transfer enhancement on shells of double-pipe exchanger with double helix fins
摘要
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 0.131and 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 wallNum and flow resistance coefficientfwere studied. The comprehensive heat transfer performances of heat exchanger were examined at the same pump power condition. The study on heat exchanger withε=0.44 showed that enhanced heat transfer effect was distinct whenl/W value is greater than 1/2. The condition ofl/W=3/4 is an optimal plan. For this case,theNum 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 differentε values showed that PEC values are raised with the increases of curvature ratioε at the samel/W values,which indicates that low and high double helical fins are more suitable to double-pipe exchangers with larger curvature ratio.关键词
双螺旋片/强化传热/套管换热器/数值模拟Key words
double stranded helix fins/heat transfer enhancement/double-pipe heat exchanger/numerical simulation分类
能源科技引用本文复制引用
李雅侠,张腾,张春梅,张丽,吴剑华..高低双螺旋片强化套管换热器壳侧换热[J].化工进展,2016,35(4):1042-1046,5.基金项目
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）。 （）
