扁管换热器内纵向涡强度与换热强度对应关系

发布时间：2018-03-15 01:26

  本文选题：涡产生器　切入点：纵向涡强度　出处：《化工学报》2016年05期 　论文类型：期刊论文

【摘要】：纵向涡强化传热技术在管翅式换热器中得到了广泛的应用。但是一直以来对纵向涡强化传热的研究主要停留在涡产生器结构参数及布置方式对换热的影响方面,文献对纵向涡强度与换热强度之间定量关系的研究鲜有报道。建立了采用纵向涡强化传热的扁管管翅换热器数值模型,采用二次流强度参数Se分析了翅片及涡产生器结构参数变化时,通道内纵向涡强度与换热强度之间的定量关系;并定量分析了通道中涡产生器引起的纵向涡强度增量与传热强化量之间的定量关系。结果表明:翅片及涡产生器结构参数变化时,Nu、Se与Re之间,以及阻力系数f与Re及Se之间均不存在定量对应关系,但Se与Nu以及?Se与?Nu之间存在对应关系。这表明,在布置有纵向涡产生器的扁管管翅换热器翅侧通道内,纵向涡强度决定了通道内的换热强度。
[Abstract]:The longitudinal vortex enhanced heat transfer technology has been widely used in tubular fin heat exchangers, but the study of longitudinal vortex enhanced heat transfer has been mainly focused on the influence of the structure parameters and arrangement of vortex generator on heat transfer. The quantitative relationship between longitudinal vortex strength and heat transfer intensity is rarely reported. A numerical model of flat tube fin heat exchanger with longitudinal vortex enhancement is established. The quantitative relationship between longitudinal vortex strength and heat transfer intensity in the channel is analyzed by using the secondary flow strength parameter se when the structural parameters of fin and vortex generator vary. The quantitative relationship between longitudinal vortex strength increment and heat transfer enhancement caused by vortex generator in the channel is quantitatively analyzed. The results show that when the structural parameters of fin and vortex generator change, there is a relationship between Nuanse and re. There is no quantitative correspondence between resistance coefficient f and re and se, but se and Nu as well as? Se and? It is shown that the longitudinal vortex intensity determines the heat transfer intensity in the fin side channel of the flat tube fin heat exchanger with longitudinal vortex generator.
【作者单位】： 兰州交通大学机电学院铁道车辆热工教育部重点实验室;
【基金】：国家自然科学基金项目(51366008,51376086) 甘肃省杰出青年基金项目(145RJDA324)~~
【分类号】：TK172

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