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摘要
The research on the bubble lift-off diameter is very important to reveal the heat transfer mechanism of subcooling flow boiling. Aiming at the cooling channel in the boiling area of ??the engine cylinder head, a rectangular experimental channel with similar hydrodynamics was designed, and a visualized experimental circulation system for supercooled flow boiling was built. To explore the influence mechanism of flow condition on the bubble lift-off diameter, an experiment was carried out by using a high-speed camera to closely observe the bubble behaviors on a horizontal aluminum heating surface under high mass flux. The influence of system pressure, wall superheat, flow velocity and liquid supercooling on the bubble lift-off diameter were studied. It was found that the bubble lift-off diameter decreased with the increase of system pressure, flow rate and subcooling degree, and increased with the increase of wall superheat. In this paper, a force balance model was established for bubble lift-off diameter. The average relative error between the predicted value of the force balance model and the experimental value was 12.25%. In order to facilitate the application of engineering field, the empirical formula of bubble lift-off diameter is established based on force balance model. The empirical formula considered more comprehensive factors and predicted the bubble lift-off diameter with an average relative error of 6.80%. ? 2022, Editorial Board of CIESC Journal. All right reserved.
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