Ratcheting fluid with geometric anisotropy

Benjamin Thiria, Jun Zhang

Research output: Contribution to journalArticlepeer-review


We investigate a mechanism that effectively transports fluids using vibrational motion imposed onto fluid boundary with anisotropy. In our experiment, two asymmetric, sawtooth-like structures are placed facing each other and form a corrugated fluid channel. This channel is then forced to open and close periodically. Under reciprocal motion, fluid fills in the gap during the expansion phase of the channel and is then forced out during contraction. Since the fluid experiences different impedances when flowing in different directions, the stagnation point that separates flows of two directions changes within each driving period. As a result, fluid is transported unidirectionally. This ratcheting effect of fluid is demonstrated through our measurements and its working principle discussed in some detail.

Original languageEnglish (US)
Article number054106
JournalApplied Physics Letters
Issue number5
StatePublished - Feb 2 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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