化工学报2017，Vol.68Issue(4)：1349-1357,9.DOI:10.11949/j.issn.0438-1157.20161281
流线型涡发生器与螺旋片强化换热器壳侧传热
Heat transfer enhancement for shell sides of heat exchangers by streamlined vortex generators and helical fins
摘要
Abstract
In order to reduce the flow resistance of shell sides of double-pipe heat exchangers enhanced by the winglet-type vortex generators and helical fins, a new kind of vortex generators, named streamlined vortex generator was proposed. Heat transfer characteristics and pressure drop behavior of the shell sides enhanced by the streamlined vortex generators and helical fins were investigated by experimental and numerical method. The comparisons on the performance between the streamlined vortex generators and the delta-winglet-pair(DWP) vortex generators were made. The enhancement effects of two installation modes for the streamlined vortex generators, common-flow-down (CFD) and common-flow-up (CFU) of streamlined vortex generators were observed. The drag reduction mechanisms of streamlined vortex generators were analyzed. The results showed that, compared with the delta winglet pair vortex generators, the same(Re < 8000)or slightly lower(Re > 8000) heat transfer coefficients can be achieved by using streamlined vortex generators. However, the drags can be reduced by 21% when the heat transfer areas and the angle of attacks were the same. Under the identical pressure drop condition, the comprehensive performance of the common-flow-up mode was a little better than that of the common-flow-down mode. The drag reduction mechanisms of streamlined vortex generators lay in theimprovement of the velocity field and the pressure field.关键词
传热/流体动力学/计算流体力学/流线型/纵向涡发生器/套管式换热器Key words
heat exchanger/hydrodynamics/computational fluid dynamics/streamline/longitudinal vortex generators/double-pipe heat exchanger分类
能源科技引用本文复制引用
张丽,尚勃均,李雅侠,王翠华,孟辉波,龚斌,吴剑华..流线型涡发生器与螺旋片强化换热器壳侧传热[J].化工学报,2017,68(4):1349-1357,9.基金项目
国家自然科学基金项目(51406125, 51506133, 21476142) （51406125, 51506133, 21476142）
辽宁省自然科学基金项目(201602596).supported by the National Natural Science Foundation of China (51406125, 51506133, 21476142) and the Natural Science Foundation of Liaoning Province (201602596). （201602596）
