This paper focuses on evaluating the effects of flow rate and temperature changes of hot and cold fluid flows in multistream multi-fluid plate-fin heat exchangers with a single-component two-phase flow in the middle heat exchanger. This three-fluid heat exchanger included three layers with offset strip and wavy fin configurations. In the adjacent heat exchanger with offset strip fins, hot and cold fluids were flowing, while the middle heat exchanger with wavy fins contained a single-component two-phase flow (condensed vapor). The Nusselt number, friction factor, the thermal performance factor, and the heat transfer surface contribution of the middle heat exchanger with each of the adjacent heat exchangers, were obtained using the measured experimental data. The results indicate that the two-phase Reynolds number was between 500 and 1800, and the vapor quality varied in the range of 0.17–0.56. Also, the heat transfer surface contribution of the adjacent cold and hot fluids was between 0.18 and 0.5. The two-phase flow in the wavy channel has a wavy and stratified pattern. The examinations showed that raising the Reynolds number of hot and cold fluids, respectively, led to maximum 13.8 % and 9.5 % of reduction in the vapor quality, 8.8 % and 9 % of increase in the two-phase Nusselt number, and 18 % and 12 % of reduction in the average value of friction factor. The domain change in the two-phase vapor quality, the two-phase fluid heat transfer surface contribution, and the flow pattern determination parameters including the dimensionless mass parameter and the Lockhart-Martinelli parameter was 33.67 %, 80.81 %, 32.72 %, and 19.09 %, respectively. As the Reynolds number of the cold fluid was changed, the variation domain of these parameters was higher compared to when the Reynolds number of the hot fluid was altered. Increasing the dimensionless temperature of the hot and cold raised the vapor quality by 12–16 %. The experimental results revealed that by decreasing the temperature of adjacent fluids and increasing their Reynolds number, the thermal performance factor of the two-phase flow was increased.

本文重点评估多流多流体板翅式换热器中冷热流体流的流量和温度变化对中间换热器中单组分两相流的影响。这种三流体热交换器包括三层，带有偏移条带和波浪形翅片配置。在相邻的带有偏置条形翅片的换热器中，冷热流体流动，而带有波浪形翅片的中间换热器包含单组分两相流（冷凝蒸汽）。使用测量的实验数据获得了中间换热器与每个相邻换热器的努塞尔数、摩擦系数、热性能系数和传热表面贡献。结果表明两相雷诺数在500～1800之间，蒸汽质量在 0.17-0.56 范围内变化。此外，相邻冷热流体的传热面贡献介于 0.18 和 0.5 之间。波状通道内的两相流呈波浪状、分层状。检查表明，提高热流体和冷流体的雷诺数，分别导致蒸汽质量最大降低 13.8% 和 9.5%，两相努塞尔数增加 8.8% 和 9%，以及 18% 和 9%摩擦系数平均值降低 12%。两相蒸汽质量、两相流体传热面贡献以及包括无量纲质量参数和Lockhart-Martinelli参数在内的流型确定参数的域变化分别为33.67 %、80.81 %、32.72 %和19.09 ％， 分别。随着冷流体雷诺数的变化，这些参数的变化域比热流体雷诺数变化时更大。增加冷热无量纲温度可将蒸汽质量提高 12-16%。实验结果表明，通过降低相邻流体的温度和增加其雷诺数，可以提高两相流的热性能因子。