In the current numerical study, three-dimensional heat and fluid flow over various arrangements of the tube bank are simulated via realizable K-ε as the turbulence model. A new arrangement, twisted tube bank is introduced and compared with the other common arrangements, inline and staggered. Temperature-dependent properties are assumed for the working fluids. The suggested experimental equations of the previous studies are used for the model validation. The influence of the Reynolds and Prandtl numbers, dimensionless transverse and longitudinal pitches, twist angle and dimensionless shell diameter on the thermo-hydraulic performance are perused. Two equations are proposed for estimation of the Nusselt number and friction factor as functions of these variables. Results indicate that, if the Reynolds number is doubled the Nusselt number increases by 71.2% and the friction factor reduces by 27.9%. Furthermore, it was found the twisted arrangement could increase the Nusselt number by 22.8% and 7.5% compared to the inline and staggered arrangements, respectively at the optimum twist angle (which is 79°). While, the friction factor increases only by 36% and 2.47% compared to the inline and staggered arrangements, respectively.

在当前的数值研究中，通过可实现的K-ε作为湍流模型模拟了在管束的各种布置上的三维热流和流体流。引入了一种新的布置，即扭曲的管束，并将其与其他常见的布置（交错排列和交错排列）进行比较。假定工作流体的温度相关属性。先前研究的建议实验方程式用于模型验证。研究了雷诺数和普兰特数，无量纲的横向和纵向螺距，扭转角和无量纲的壳径对热工液压性能的影响。提出了两个方程式来估算作为这些变量的函数的努塞尔数和摩擦系数。结果表明，如果雷诺数增加一倍，则努塞尔数增加71.2％，摩擦系数减小27.9％。此外，发现在最佳扭曲角（79°）下，与直列和交错排列相比，扭曲排列可使Nusselt数分别增加22.8％和7.5％。而摩擦系数与串联排列和交错排列排列相比分别仅增加36％和2.47％。