Heat Transfer Characteristics Analysis and Structure Optimization of Perforated Louver Fins

The flow and heat transfer of air in perforated louver fin heat exchanger is simulated by ANSYS-FLUENT software. The fin structure of perforated louver is optimized from the two aspects of air side flow heat transfer and fin heat conduction. Taking the comprehensive performance factor as the evaluation index, the hole shape (round hole and square hole) and the hole arrangement order (sequential arrangement and cross arrangement) under the same area are compared and analyzed, and the conclusion is that the square hole is better than the round hole, and the sequential arrangement is better than the cross arrangement. Finally, the multi-objective optimization of the fin angle of attack and the side length of the square hole is carried out by using the Genetic Algorithm. The air inlet velocity is 2.5m/s, and the maximum heat transfer factor and the minimum resistance factor are taken as the optimization objectives. The final results show that when the angle is 33.903 degrees and the side length is 1.5102 mm, the comprehensive performance is the best, and the comprehensive performance factor is 0.068903. Compared with the common fin with an angle of 30 degrees, the resistance factor of the optimal structure of the perforated louver fin is reduced by 45.14%; the heat transfer factor is increased by 79.57%; the comprehensive evaluation factor is increased 118.9%.