Abstract The plate-fin heat exchangers with pressure-resistant offset strip fins are widely used in the C3MR and other liquid natural gas (LNG) systems, and the two-phase pressure drop characteristics of flow boiling in pressure-resistant offset strip fin channels is a crucial factor for designing and optimizing the compact heat exchangers. A cryogenic experimental rig was established to obtain two-phase pressure drop data in the present study and the fin thickness of 0.4 mm is selected based on an actual compact heat exchanger in the C3MR LNG liquefaction system. The tested fluid is R22, and the experimental conditions include mass fluxes of 64–128 kg/(m2·s), vapor qualities of 0.1–1.0, saturation pressures of 0.22–0.26 MPa, and heat fluxes of 0.7–5.5 kW/m2. The comparison between the obtained data for fin thickness of 0.4 mm and those for fin thickness of 0.1–0.4 mm in literatures show that, the friction factor f of gas flow in channels increases with the increasing fin thickness, and the increment is 306%–451% as the fin thickness increases from 0.1 mm to 0.4 mm. The research results of two-phase flow show that, as the vapor quality increases, the frictional pressure drops initially increase and then decrease, representing a maximum at vapor quality of 0.90. With the increment of heat fluxes, the average vapor quality increases, resulting in the increasing frictional pressure drops. The two-phase multiplier of two-phase pressure drop varies from 3 to 35 and increases with the decreasing fin thickness and hydraulic diameter. A new correlation of two-phase pressure drops in offset strip fins with different fin thicknesses was developed within a deviation of ±25%.

中文翻译：

---

偏置条形翅片通道流动沸腾两相压降特性试验研究及相关性研究

摘要 耐压偏置带翅片板翅式换热器广泛应用于C3MR等液化天然气（LNG）系统，耐压偏置带翅片通道内流动沸腾的两相压降特性为设计和优化紧凑型换热器的关键因素。在本研究中建立了低温实验台以获得两相压降数据，并基于C3MR LNG液化系统中的实际紧凑型换热器选择0.4 mm的翅片厚度。被测流体为R22，实验条件为质量通量64-128 kg/(m2·s)，蒸汽质量0.1-1.0，饱和压力0.22-0.26 MPa，热通量0.7-5.5 kW/m2 . 翅片厚度为 0 时所得数据之间的比较。4 mm 和文献中翅片厚度为 0.1-0.4 mm 的那些表明，通道中气流的摩擦系数 f 随着翅片厚度的增加而增加，并且随着翅片厚度从 0.1 mm 增加，增量为 306%-451%到 0.4 毫米。两相流研究结果表明，随着蒸汽质量的增加，摩擦压降先增大后减小，在蒸汽质量为0.90时达到最大值。随着热通量的增加，平均蒸汽质量增加，导致摩擦压降增加。两相压降的两相乘数从3到35不等，并随着翅片厚度和水力直径的减小而增加。在±25% 的偏差内，开发了具有不同翅片厚度的偏置带翅片中两相压降的新相关性。