Abstract
During quenching, the Leidenfrost effect deteriorates the heat transfer at high temperatures before the arrival of the minimum film boiling point. Accurate prediction of the minimum film boiling temperature (Tmin) is significant in assessing cooling efficiency and providing a reference for optimization design. The experimental investigation on the Tmin is carried out in multi-narrow rectangular channels containing internal and external coolant channels. The effects of initial surface temperature and wall heat flux on Tmin are discussed in detail. The experimental results indicate that Tmin increases with the increase of initial wall temperature and wall heat flux, by an average of 6.5% and 7.7%, respectively. Under high wall temperature and heat flux conditions, the ratio of Tmin to the initial wall temperature at the inlet is much larger and then remains nearly constant with the propagation of the quench. Furthermore, an improved dimensionless prediction model of Tmin is proposed considering the effects of high initial wall temperature and wall heat flux. The comparison results illustrate good agreement with relative errors within ± 15%. Meanwhile, the current model predicts most of the published experimental data with an uncertainty of ± 15%.
Published Version
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