Laboratory experiments were conducted to generate empirical dimensionless correlations for estimating surface roughness of frost formed on a cold flat plate under forced convection. Environmental variables, including wall temperature T s , air velocity V air , relative humidity RH , and air temperature T air , were considered when generating the correlations. The test conditions were chosen to simulate the environmental conditions experienced by cold-soaked fuel frost formation on the upper surface of airplane wings. Experimental conditions included wall temperatures from 20 to - 5 ° C , freestream temperatures from 8 to 16 ° C , relative humidities from 60 to 91%, and air velocities from 0.5 to 2.5    m s 1 . The root-mean-square height, skewness, and equivalent sand-grain roughness height of frost were correlated as functions of the Reynolds number, absolute humidity, and dimensionless temperatures. The comparison between the correlation of frost equivalent sand-grain roughness height in this study and a previous model revealed the importance of test surface geometry on frost roughness formation.


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    Title :

    Dimensionless Model of Frost Roughness on Cold Flat Plate Under Forced Convection


    Contributors:

    Published in:

    Journal of Aircraft ; 58 , 6 ; 1375-1385


    Publication date :

    2021-07-02


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English