This work experimentally tests and numerically investigates the heat transfer augmentation, the flow characteristics and the overall thermal performance of truncated ribs in a rectangular channel with an aspect ratio of 1:4 designed by using the constructal theory. The liquid crystal thermography (LCT) method in steady-state is adopted and the three-dimensional CFD numerical simulations with an established transition k-kl-ω model are conducted to reveal the underlying thermo-fluid mechanisms. Seven cases with novel truncated ribs designed by using constructal theory are designed to improve the heat transfer performances compared with the case with continuous ribs. Among them, ribs with different cross sections, different arrangements and different cut-off angles are studied, based on which, two ways to improve the heat transfer performances with respect to the truncated ribs are given. In addition, two indexes, i.e., Nu/Nu₀/(f/f₀) and Nu/Nu₀/(f/f₀)^1/3, are considered to study the overall thermal hydraulic performance of the considered cases. Results show that with respect to the factor Nu/Nu₀/(f/f₀), the designed cases can improve the overall thermal performance up to 38.21%, and with respect to the factor Nu/Nu₀/(f/f₀)^1/3, the designed cases can improve the overall thermal performance up to 12.16%. By analyzing the flow characteristics, the underlying mechanisms about such thermal performance enhancements of the designed cases are revealed. Finally, the augmentation entropy generation number of each case is calculated to evaluate the effect of augmentation on irreversibility.

本工作通过实验测试和数值研究了基于构造理论设计的长宽比为 1:4 的矩形通道中截断肋的传热增强、流动特性和整体热性能。采用稳态液晶热成像 (LCT) 方法和具有已建立跃迁k-kl-ω的三维 CFD 数值模拟进行模型以揭示潜在的热流体机制。采用构造理论设计了7个新型截断肋的案例，与连续肋的案例相比，旨在提高传热性能。其中，研究了不同截面、不同排列方式和不同截角的肋条，在此基础上给出了两种提高截断肋条传热性能的方法。另外还有两个索引，即Nu / Nu ₀ /( f / f ₀ ) 和Nu / Nu ₀ /( f / f ₀ ) ^1/3，被认为是研究所考虑案例的整体热力水力性能。结果表明，相对于因素Nu / Nu ₀ /( f / f ₀ )，设计的工况可将整体热性能提高高达 38.21%，而相对于因素Nu / Nu ₀ /( f / f _{0 )} ) ^1/3，设计案例可以将整体热性能提高高达12.16％。通过分析流动特性，揭示了有关设计案例的这种热性能增强的潜在机制。最后，计算每个案例的增强熵生成数以评估增强对不可逆性的影响。