Analysis of phase transition process and multiphase distribution in melting stage of frozen droplets
To address the common issues of frost and ice formation in industrial application and aerospace fields,different dynamic evolution processes and phase distribution characteristics of the melting stage of frozen droplets were investigated using a CCD-based high-speed image obser-vation method with different substrate surfaces and different substrate surface temperatures as working conditions.The different dynamic evolution processes and phase distribution characteris-tics of the melting stage were analyzed around different substrate surfaces and different substrate surface temperatures.The results show that the freezing droplets on metallic substrate surfaces had smaller internal bubbles and were more densely distributed during the melting process;the freez-ing droplets on polymeric substrate surfaces had larger internal bubbles during the melting process,and the bubbles were clustered around and on top of the solid phase region;the freezing rate had an important influence on the size of the bubbles,with the smaller the freezing rate,the larger the bubbles produced,and the larger the freezing rate,the smaller the bubbles produced.The droplets on the metal substrate surface showed a clear precursor film during the wetting process,while this phenomenon did not occur on the polymer surface.The pore area inside the frozen droplets on the polymer surface was larger,while the opposite was true for the metal sur-face,and the water distribution inside the pores had a facilitating effect on ice crystal melting.
dropletsfreezemeltmorphological evolutionmultiphase distribution
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