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为了定量描述海上横荡工况对板翅式换热器内天然气冷凝过程热质传递的影响规律,建立了板翅式换热器波纹翅片通道内冷凝流动与传热的数值模型。首先针对天然气冷凝过程的传热传质机理进行分析;通过翅片壁面的组分守恒建立了天然气冷凝过程的传质子模型,并基于传质速率计算得出潜热传热速率。基于提出的模型,对于不同干度下的板翅式换热器内天然气传热传质进行分析,发现当干度为0.05时,传热系数平均恶化32.9%,当干度上升至0.2时,恶化得到改善,传热系数平均降低28.7%。
In order to quantitatively describe the influence law of the transversal oscillation on the heat and mass transfer of natural gas in plate-fin heat exchangers, a numerical model of flow and heat transfer in corrugated fin channel of plate-fin heat exchanger was established. Firstly, the heat and mass transfer mechanism of natural gas condensing process is analyzed. The proton transfer heat transfer model of natural gas condensing process is established by the conservation of components of the fin wall. The latent heat transfer rate is calculated based on mass transfer rate. Based on the proposed model, the heat and mass transfer of natural gas in plate-fin heat exchangers under different dry conditions was analyzed. The results showed that when the dryness was 0.05, the heat transfer coefficient deteriorated by 32.9% on average. When the dryness increased to 0.2, Deterioration improved, heat transfer coefficient decreased by an average of 28.7%.