作　　者： ; ; ; ;

机构地区： 华南理工大学化学与化工学院传热强化与过程节能教育部重点实验室

出　　处： 《华南理工大学学报（自然科学版）》 2007年第4期77-81,共5页

摘　　要： 分析了一种新型的传热强化元件——旋流片作为管间支撑物时的流动与传热特性.应用周期性单元流道模型,对光滑管束间支撑物的强化传热进行了数值模拟和实验研究.采用重整化(RNG)κ-ε双方程湍流模型,以SIMPLEC算法进行压力和速度的耦合,并采用强化壁处理法处理壁面,模拟了单元流道的流场与温度场,比较了空心环和旋流片的综合热力性能.结果表明:旋流片可以使流体作三维螺旋运动,起到强化换热的作用.两种旋流片的换热效果都优于空心环,但阻力损失也都大于空心环;小扭率的旋流片会引起较大的形体阻力,导致综合热力性能反而不如空心环;旋流片的结构参数是影响其综合热力性能的主要因素. The flow and heat-transfer characteristics of a new type of heat-transfer enhancement element, namely, the twisted tape as the tube bundle support, are analyzed. A shell-side periodic unit channel model is developed to conduct the numerical simulation and experimental investigation of the heat transfer enhanced with smooth tube bun- dle supports. The RNG κ-ε two-equation turbulent model is then adopted to simulate the fluid and temperature fields in a unit channel. In the simulation, the SIMPLEC algorithm is used to solve the coupling between the pressure and the velocity, and an enhanced wall treatment is employed to solve the near-wall flow and heat transfer. Moreover, the integrated thermal performances of both the ring and the twisted-tape supports are compared. The results demonstrate that （ 1 ） the twisted tape produces a helical flow, which results in the disruption of the continuous and stable fluid and enhances the heat transfer effectively, （2） the two types of twisted-tape supports have better heat-transfer enhancement and more pressure drop than the ring support, （3） the integrated thermal performance of the ring support is stronger than those of the twisted tapes with small twist ratio because the latter have a higher form-pressure drop, and （4） the structural parameters of twisted tapes show crucial influence on their thermal performance.

关 键 词： 换热器 旋流片 强化传热 数值模拟 压力降

领　　域： [动力工程及工程热物理] [动力工程及工程热物理]