Abstract
When a container filled with granular material is subjected to vertical vibration in the presence of gravity, under certain conditions a non-monotonous density profile can be observed. This effect which is characteristic for dissipative granular gases, was termed “floating cluster regime” or “granular Leidenfrost effect”. Here, we study the behavior of vibro-agitated granular matter in the absence of gravity and identify a corresponding stationary state of the granulate, that is, we provide experimental evidence of the granular Leidenfrost effect under conditions of weightlessness.
Highlights
When sprinkling a drop of water onto a hot surface, different behavior can be observed, depending on temperature
We studied the granular dynamics for sinusoidal vibration of frequency and peak-to-peak amplitude in the range f = (5 ... 35) Hz and A = (1 ... 19) mm, respectively
We provide experimental evidence for the occurrence of the granular Leidenfrost effect under weightlessness conditions
Summary
When sprinkling a drop of water onto a hot surface, different behavior can be observed, depending on temperature. For T ≳ 220 ◦ C, counterintuitively the drop persists much longer on the hot surface due to a vapor layer formed between the drop and the hot surface, which reduced heat transfer drastically. This phenomenon was first described by Leidenfrost [1,2,3,4,5] and is known as Leidenfrost effect. Mostly studied with water drops, the Leidenfrost effect can be observed with stiff sublimable solids, e.g., dry ice [6,7,8,9]. It was found that hydrogel balls, that is, vaporizable soft solids, float above a hot surface similar to a drop of water when gently deposited [10] but bounce persistently when dropped onto the hot surface [11]
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