Abstract Heat and mass transfer enhancement in a convective flow is studied using a variational optimization technique. Entropy generation rate is minimized while allowing to vary the relative weight of the total viscous dissipation in the objective functional to determine optimized velocity and scalar field patterns. The resulting velocity, thermal and mass concentration fields are analyzed as well as the influence of boundary conditions. The relative improvement of the optimized solutions is assessed and heat transfer vs. mass diffusion results are compared. The optimization approach leads to improved entropy generation rates. The viscous dissipation weighting factor influences the entropy generation rates and the velocity and scalar field patterns. A transition between two levels of perturbation by comparison to non-optimized flows occurs at a critical value of the weighting factor that depends on the boundary conditions. The flow patterns obtained by variational optimization can be the basis for enhanced exchanger design.

中文翻译：

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通道流中的熵生成最小化：应用于不同的对流扩散过程和边界条件

摘要 使用变分优化技术研究了对流中的传热和传质增强。熵生成率被最小化，同时允许改变目标函数中总粘性耗散的相对权重，以确定优化的速度和标量场模式。分析了由此产生的速度、热和质量浓度场以及边界条件的影响。评估优化解决方案的相对改进，并比较传热与质量扩散的结果。优化方法可提高熵生成率。粘性耗散加权因子影响熵生成率以及速度和标量场模式。与非优化流相比，两个扰动水平之间的转变发生在取决于边界条件的加权因子的临界值处。通过变分优化获得的流型可以作为增强交换器设计的基础。