To optimize the plate-fin heat exchangers in the cryogenic processing system, the heat transfer characteristics of two-phase flow boiling for high-efficiency and pressure-resistant offset strip fins in plate-fin heat exchangers were investigated experimentally. The experimental conditions cover heat fluxes of 0.7–5.5 kW/m², mass fluxes of 64–128 kg/(m²·s) and vapor qualities of 0.1–1.0. The research results show that, as the vapor quality increases, the heat transfer coefficient initially increases and then decreases, representing a maximum at vapor quality of 0.75–0.85; the critical conditions of the bubbly-annular transformation and the annular-mist transformation are corresponding to the void fractions of 0.92 and 0.985, respectively. A new correlation of two-phase heat transfer coefficient for flow boiling in offset strip fin channels was developed based on the experimental data in the present study and in the literature, and the prediction deviation is within ±25%.

为了优化低温处理系统中的板翅式换热器，实验研究了板翅式换热器中高效且耐压的偏置条形翅片的两相流沸腾换热特性。实验条件包括热通量为0.7-5.5 kW / m ²，质量通量为64-128 kg /（m ²·s）和蒸气质量为0.1–1.0。研究结果表明，随着蒸气质量的增加，传热系数先增大然后减小，这在蒸气质量为0.75-0.85时达到最大值。气泡-环形转变和环形-雾转变的临界条件分别对应于0.92和0.985的空隙率。根据本研究和文献中的实验数据，建立了偏置带状翅片通道内两相传热系数与流动沸腾的新关系，预测偏差在±25％以内。