Abstract
The density of accreted ice has been experimentally investigated by performing local measurements with a technique based on X-ray micrography of calibrated slices. Accreted ice deposits were grown on fixed cylinders, which allowed an investigation of the accretion process in steadier and more regular conditions at the stagnation point, avoiding oscillations in local surface temperature. Further data used were obtained from previous work on rotating cylinders. The results show that the values of the local ice density found using X-ray micrography are unexpectedly high compared with previous results. This discrepancy is discussed and mostly related to the different techniques used and different estimations of the air between lobes penetrating deeply inside the deposit. The consequences of these results in various situations of natural ice accretions are discussed, as well as on understanding basic mechanisms of low density ice formation due to collision and freezing of droplets on an ice substrate.
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