梯形和矩形纵肋管束特性研究及性能比较

研究得出梯形和矩形纵肋管束传热性能及流阻性能关系式，并着重分析两种纵助管束换热器的特性差异深入探讨了管束节距、肋高及厚度对传热和流阻性能的影响研究结果表明,即使同为纵助管束，由于肋片截面形式不同，其性能差异较大，换热程度相差-11％～34％，而流阻程度差距最高可达12倍梯形纵肋管束表现出更良好的低流阻特性和能量综合利用性能横向密排布置时，纵肋管束较光管管束具有更低的流阻特性和一定的传热增强作用，其中以梯形肋片更加明显

CHARACTERISTICS OF TRAPEZOID AND RECTANGLE LONGITUDINAL FIN TUBE BANKS

The heat transfer and flow friction performance for the flow across tube banks with longitudinal trapezoid fins and rectangle fins are reported,and the difference of the performance between both tube banks is studied.This work analyses the influence of the pitch,fin height and width The different fins（trapezoid and rectangle）result in the difference of performance and by comparison the difference of heat transfer is about-ll％ ～34％,the greatest difference of flow friction is aboutl.2 times The trapezoid fin can gain the lower flow friction and the better com prehensive utilization of energy When banks are in a dense transversal arrangement the longitu dinally finned tube banks have lower flow friction and better heat transfer than the smooth tube bank.