异形孔隔板换热器壳侧传热与阻力性能的试验研究  

Experimental study on shell-side heat transfer and flow resistance performance of heat exchangers with non-round orifice baffles

作　　者：盛艳军[1,2] 陈亚平[1,2] 操瑞兵[1,2] 董聪[1,2] 吴嘉峰[1,2] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]东南大学能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2012年第2期318-322,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50976022)

摘　　要：对正方形孔、三角圆头孔、网状孔、六角梅花孔隔板换热器及弓形折流板换热器的传热性能和压降性能进行了测试试验.试验件采用公用管壳可拆卸芯体管束结构,针对其特点将壳侧轴向雷诺数作为自变量,利用单位壳侧轴向欧拉数的壳侧努谢尔特数指标来反映换热器的综合性能.试验结果表明,网状孔隔板换热器的壳侧换热系数与弓形折流板换热器相当,但该换热器的压降较低,在试验范围内综合性能指标的相对值为1.274;六角梅花孔、三角圆头孔和正方形孔隔板换热器的壳侧换热系数和综合性能均不及弓形折流板换热器.此外,不同的异形孔隔板换热器的传热性能与异形孔的形状或通流孔数目有关,流动阻力与通流孔的总面积和水力周长有关.The shell-side heat transfer and flow resistance performances of shell-and-tube heat ex- changers with different non-round orifice baffle （square, fillet triangle, mesh and cinquefoil） and a segment baffle heat exchanger were tested. A common heat exchanger shell and replaceable tubebundles were adopted. The shell-side axial Reynolds number is used as the independent variable ver- sus the characteristics of the testing heat exchangers. The integrated index of the shell-side Nusselt number over the axial Euler number is suggested for evaluation of the heat exchanger performance ofdifferent schemes. The experimental results show that the mesh orifice baffle has the equivalent heat transfer coefficient as the segment baffle. But the pressure drop of the former is lower, and in the experimental range the average value of the relative comprehensive performance of the shell-side Nusselt number over the axial Euler number is about 1. 274. Both the heat transfer coefficients andthe comprehensive performance indexes of the heat exchangers with cinquefoil, fillet triangle and square orifice are lower than those of the segment baffle heat exchanger. The heat transfer perform- ance of the heat exchangers with non-round orifice baffles is related to the shape and the number ofthe orifices, and the flow resistance is related to the total area and hydraulic perimeter of the flow or- ifices.

关 键 词：管壳式换热器 异形孔隔板 性能试验 换热系数 网状孔隔板 

分 类 号：TK172[动力工程及工程热物理—热能工程]