Analysis of Entropy Generation and Multi-Parameter Optimization of Flying-Wing Fins in Condensers

This study investigates the application of flying-wing fins (FWF) in refrigerator condensers. Compared with conventional condensers, FWF structures eliminate contact thermal resistance and reduce refrigerator energy consumption by 6.06%. The heat transfer mechanism, entropy generation characteristics, and parameter optimization of FWF are comprehensively analyzed. Results show that the local convective heat transfer coefficient decreases along the flow direction, with the maximum value in the wave-crest region and the minimum in the wave-trough region. The Colburn j factor is positively correlated with fin pitch (Fp) and amplitude (A), but negatively correlated with fin length (H) and thickness (Ft). The fanning friction factor (f) increases with A and Ft, decreases with H, and first increases then decreases with Fp. Fin height (Fh) exerts minimal influence on j and f factors. Thermal entropy generation and flow entropy generation are negatively correlated with Fp and positively with other parameters. The Bejan number remains around 0.9, indicating that thermal entropy generation dominates total entropy generation. Finally, the contribution ratios of key parameters to j and f factors are quantified. These findings clarify the heat transfer behavior of FWF and provide a theoretical foundation for designing high-efficiency flying-wing condensers with reduced energy consumption.