Distribution, coalescence, and freezing characteristics of water droplets on surfaces with different wettabilities under subfreezing convective flow

نویسندگان

چکیده

This paper investigates the effects of surface wettability and initial conditions on early frost formation for hydrophobic, hydrophilic, bare aluminum flat surfaces. The new data revealed that average droplet sizes were larger size distributions wider hydrophilic than hydrophobic was due to a coalescence phenomenon occurring before droplets froze into ice beads. Because relative high sub-freezing plate temperatures used in this work, plates had smaller impact freezing time. Supersaturation degree temperature difference between air stream controlled times all different types. When testing conducted without cleaning surfaces individual test runs, film deposited which smoothed imperfections, inhibited shape, delayed freezing. A large variation nucleation behavior measured present work intentionally generated cleanness conditions. finding could explain some significant deviations observed from literature studies when comparing diameters similar coatings tests

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ژورنال

عنوان ژورنال: Applied Thermal Engineering

سال: 2021

ISSN: ['1873-5606', '1359-4311']

DOI: https://doi.org/10.1016/j.applthermaleng.2020.116052