### Abstract

Original language | English |
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Title of host publication | Bulletin of the American Physical Society |

Number of pages | 1 |

Volume | 61 |

Publisher | American Physical Society |

Publication date | 2016 |

Article number | A22.00007 |

Publication status | Published - 2016 |

Event | 69th Annual Meeting of the APS Division of Fluid Dynamics - Portland, United States Duration: 20 Nov 2016 → 22 Nov 2016 |

### Conference

Conference | 69th Annual Meeting of the APS Division of Fluid Dynamics |
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Country | United States |

City | Portland |

Period | 20/11/2016 → 22/11/2016 |

### Cite this

*Bulletin of the American Physical Society*(Vol. 61). [A22.00007 ] American Physical Society.

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*Bulletin of the American Physical Society .*vol. 61, A22.00007 , American Physical Society, 69th Annual Meeting of the APS Division of Fluid Dynamics, Portland, United States, 20/11/2016.

**Effect of meniscus constact angle during early regimes of spontaneous capillarity in nanochannels.** / Karna, N.K.; Oyarzua, Elton; Walther, Jens Honore; Zambrano, Harvey.

Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research › peer-review

TY - ABST

T1 - Effect of meniscus constact angle during early regimes of spontaneous capillarity in nanochannels

AU - Karna, N.K.

AU - Oyarzua, Elton

AU - Walther, Jens Honore

AU - Zambrano, Harvey

PY - 2016

Y1 - 2016

N2 - In capillary imbibition, the classical Lucas-Washburn equation predicts a singularity as the fluid enters the channel con-sisting in an anomalous innite velocity of the capillary meniscus. The Bosanquets equation overcomes this problem by taking into account fluid inertia predicting an initial imbibition regime with constant velocity. Nevertheless, the initial constant velocity predicted by Bosanquet's equation is much greater than experimentally observed. In the present study, we conduct atomistic simulations to investigate capillary imbibition of water in silica nanochannels with heights between 4 and 18 nm. We alsofind that the meniscus contact angle remains constant during the inertial regime and its value depends upon the height of the channel. We also find that the meniscus velocity computed at the channel entrance is related to the particular value of themeniscus contact angle. Moreover, after the inertial regime, the meniscus contactangle is found to be time dependent for all the channels under study. We propose an expression for the time evolution of the dynamic contact angle in nanochannels which, when incorporated in Bosanquets equation, satisfactorily explains the initial capillary rise.

AB - In capillary imbibition, the classical Lucas-Washburn equation predicts a singularity as the fluid enters the channel con-sisting in an anomalous innite velocity of the capillary meniscus. The Bosanquets equation overcomes this problem by taking into account fluid inertia predicting an initial imbibition regime with constant velocity. Nevertheless, the initial constant velocity predicted by Bosanquet's equation is much greater than experimentally observed. In the present study, we conduct atomistic simulations to investigate capillary imbibition of water in silica nanochannels with heights between 4 and 18 nm. We alsofind that the meniscus contact angle remains constant during the inertial regime and its value depends upon the height of the channel. We also find that the meniscus velocity computed at the channel entrance is related to the particular value of themeniscus contact angle. Moreover, after the inertial regime, the meniscus contactangle is found to be time dependent for all the channels under study. We propose an expression for the time evolution of the dynamic contact angle in nanochannels which, when incorporated in Bosanquets equation, satisfactorily explains the initial capillary rise.

M3 - Conference abstract in proceedings

VL - 61

BT - Bulletin of the American Physical Society

PB - American Physical Society

ER -