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Dynamique saccadée du séchage de feuilles biomimétiques
Ludovic Keiser, Benjamin Dollet & Philippe Marmottant Université Grenoble Alpes, Laboratoire Interdisciplinaire de Physique (LiPhy)1. Real leaves exhibit violent and
discontinuous embolization
Brodribb, Bienaimé & Marmottant, PNAS (2016)
-dL/dt = aL + b
« bulk » pervaporation
meniscus evaporation
Dollet, Louf, Jensen, Alonzo & Marmottant, JRSI (2019)
Dollet, Encarnacion, Gautier & Marmottant, JFM (2021)
2. Simple bio-mimetic leaves undergo smooth air seeding
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6 7 8 9
10 time
P
P0
P0-2γ/wp
Laplacepressure-induced elastic loadingof the channel « Conventional »pervaporationdynamics in arectangular channel
Sudden elastic relaxation (amplified by capillarity)
P0
P0
P0
P0
P0 P0
P0
P0
P0
P0 P P P P P
P P P P
P
1 3
5
7 8
10 h
wout lout wp
x y z
1 2 3 4 5
6 7 8 9
10 time
P
P0
P0-2γ/wp
Laplacepressure-induced elastic loadingof the channel « Conventional »pervaporationdynamics in arectangular channel
Sudden elastic relaxation (amplified by capillarity)
P0 P0 P0 P0 P0 P0
P0 P0 P0 P0 P
P P P P
P P P P P
1 3
5
7 8
10
3. The presence of biomimetic pits in the network enables to recover these sudden
propagations
ljump
tjump
4. These jumps can be interpreted as consequences of the elastic relaxation of the compliant microchannel
Perspectives
Simulations of the channel deformations Complex networks with multiple pits and hierarchical structures
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Mass conservation
ljump Experiments
wout lout h δ wp γ
checked checked checked checked
checked to be confirmed
Force-free cross-section of the channel
Deformed cross-section pre-jump
ΔA
A0 Assumption:
ΔA/A0 = ljump/lout
