Abstract
This study developed a theoretical model of film evaporation heat transfer in the microfin tube under a high vapour quality region. A liquid film flow model in the micro groove was constructed. The thickness and heat transfer characteristics in the thin-film region and meniscus region were analysed. As a result, the heat transfer coefficient increases as the vapour quality and the mass flux increase. Before the dryout occurs, the heat transfer coefficient reaches a peak due to the thinned meniscus film thickness. The theoretical predicted heat transfer coefficients were compared with available experimental data under actual tube geometries and operating conditions, and were well consistent with the experimental data. This result indicated the present theoretical analysis is beneficial for understanding the heat transfer enhancement mechanism in the microfin tubes.
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