Abstract: A k-ε turbulent model and enhanced wall function method are applied to simulate the convective heat transfer in air flow across hollow fiber membrane bundles.The velocity field and pressure field are coupled and solved by the SIMPLEC algorithm.The second order upwind scheme is employed to discretize the conservation equations.Mean Nusselt number and friction factor under various pitch to tube diameter ratios are calculated.The effect of changing longitudinal pitch，transverse pitch and Reynolds number on mean Nusselt number and friction factor is analyzed.

Key words: flow across tube bundles, convective heat transfer, turbulent flow

摘要： 采用标准k-ε模型和增强壁面函数法对空气横掠中空纤维膜管束的强制对流换热进行数值模拟。采用SIMPLEC算法求解速度场和压力场的耦合，守恒方程采用二阶迎风格式离散。计算得到了不同管间距比下的管束平均Nusselt数和阻力系数。分析了纵横管间距比及Reynolds数的改变对管束平均Nusselt数和阻力系数的影响。

关键词: 横掠管束, 对流换热, 湍流