论文部分内容阅读
本文分析了圆管内单相对流传热过程的熵产,以局部熵产率为优化目标,流动功耗一定及能量与质量守恒为约束条件,应用拉格朗日极值原理对管内流动进行分析优化,导出局部熵产率为最小时的控制方程组,并运用Fluent软件对该方程组进行数值求解,得到圆管单相优化后的速度场与温度场。结果表明,以熵产最小为目标优化后的流场为多涡的纵向旋流,其换热及流动性能较好。
In this paper, the entropy production of single-phase convective heat transfer in a circular tube was analyzed. The local entropy yield as the optimization objective, the flow power consumption and the conservation of energy and mass as the constraints, the Lagrange extremum principle was used to analyze and optimize the flow in the pipe , The governing equations with the lowest local entropy yield are deduced and the governing equations are solved numerically using Fluent software to obtain the velocity field and the temperature field after the single-phase pipe is optimized. The results show that the optimized eddy flow field is multi-vortex longitudinal swirling flow, which has the best heat transfer and flow performance.