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

N.K. Karna, Elton Oyarzua, Jens Honore Walther, Harvey Zambrano

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review

74 Downloads (Pure)

Abstract

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.
Original languageEnglish
Title of host publicationBulletin of the American Physical Society
Number of pages1
Volume61
PublisherAmerican Physical Society
Publication date2016
Article numberA22.00007
Publication statusPublished - 2016
Event69th Annual Meeting of the APS Division of Fluid Dynamics - Portland, United States
Duration: 20 Nov 201622 Nov 2016

Conference

Conference69th Annual Meeting of the APS Division of Fluid Dynamics
CountryUnited States
CityPortland
Period20/11/201622/11/2016

Cite this

Karna, N. K., Oyarzua, E., Walther, J. H., & Zambrano, H. (2016). Effect of meniscus constact angle during early regimes of spontaneous capillarity in nanochannels. In Bulletin of the American Physical Society (Vol. 61). [A22.00007 ] American Physical Society.
Karna, N.K. ; Oyarzua, Elton ; Walther, Jens Honore ; Zambrano, Harvey. / Effect of meniscus constact angle during early regimes of spontaneous capillarity in nanochannels. Bulletin of the American Physical Society . Vol. 61 American Physical Society, 2016.
@inbook{4b2f580818ff4ad9ab75adc71c1c657d,
title = "Effect of meniscus constact angle during early regimes of spontaneous capillarity in nanochannels",
abstract = "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.",
author = "N.K. Karna and Elton Oyarzua and Walther, {Jens Honore} and Harvey Zambrano",
year = "2016",
language = "English",
volume = "61",
booktitle = "Bulletin of the American Physical Society",
publisher = "American Physical Society",
address = "United States",

}

Karna, NK, Oyarzua, E, Walther, JH & Zambrano, H 2016, Effect of meniscus constact angle during early regimes of spontaneous capillarity in nanochannels. in 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.

Bulletin of the American Physical Society . Vol. 61 American Physical Society, 2016. A22.00007 .

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-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 -

Karna NK, Oyarzua E, Walther JH, Zambrano H. Effect of meniscus constact angle during early regimes of spontaneous capillarity in nanochannels. In Bulletin of the American Physical Society . Vol. 61. American Physical Society. 2016. A22.00007