Abstract:
We study the forced aspiration of small ( mm) and large ( cm) liquid drops, deposited on prewetted porous membranes, and pumped mechanically with a constant current J. Two kinds of membranes are used where the pores are i) disconnected, cylindrical and calibrated or ii) interconnected “sponge-like”. Whatever the size of the drops and the intensity J of the current, two suction regimes are observed versus time: 1) a “locked” regime, when the drop is pinned, with a dynamic contact angle decreasing from advancing () to finite receding () contact angle; 2) an “unlocked” regime, where the contour line recedes with a constant contact angle closed to . In both regimes, the shape of the drop remains quasistatic, during the suction process, i.e. a spherical cap for small drops and a flat “gravity pancake” for large ones.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received 19 January 2000
Rights and permissions
About this article
Cite this article
Bacri, L., Brochard-Wyart, F. Droplet suction on porous media. Eur. Phys. J. E 3, 87–97 (2000). https://doi.org/10.1007/s101890070044
Issue Date:
DOI: https://doi.org/10.1007/s101890070044