Abstract
Squeezing of a droplet between a pair of plates serves as an experimental method for probing the dynamics of moving contact lines (CL). It is also indicative of a possible interplay between inner-scale effects and the bulk flow hydrodynamics. In this paper strong squeezing of a two-dimensional liquid droplet between parallel plates moving against each other is studied in the inertialess approximation. It is shown that the dynamics of the moving CL is mainly governed by the macroscopic bulk flow, whereas molecular slip and wetting in the vicinity of the CL have a minor effect. As a result, the apparent contact angle continuously increases, and after some time rolling motion inevitably sets in. After a longer time, the shape of the free surface tends to become close to circular, albeit distinct from a circle. This is because at the late stage of squeezing, the shape of the free surface is determined mainly by the viscous stresses, which dominate capillary stresses due to the surface tension.
| Original language | English |
|---|---|
| Pages (from-to) | 911-925 |
| Number of pages | 15 |
| Journal | International Journal of Multiphase Flow |
| Volume | 28 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2002 Jun 1 |
| Externally published | Yes |
Fingerprint
Keywords
- Apparent contact angle
- Droplets
- Moving contact line
- Squeezing flow
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
- Mechanical Engineering
Cite this
Strong squeezing flow between parallel plates leads to rolling motion at the contact line. / Reznik, S. N.; Yarin, Alexander.
In: International Journal of Multiphase Flow, Vol. 28, No. 6, 01.06.2002, p. 911-925.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Strong squeezing flow between parallel plates leads to rolling motion at the contact line
AU - Reznik, S. N.
AU - Yarin, Alexander
PY - 2002/6/1
Y1 - 2002/6/1
N2 - Squeezing of a droplet between a pair of plates serves as an experimental method for probing the dynamics of moving contact lines (CL). It is also indicative of a possible interplay between inner-scale effects and the bulk flow hydrodynamics. In this paper strong squeezing of a two-dimensional liquid droplet between parallel plates moving against each other is studied in the inertialess approximation. It is shown that the dynamics of the moving CL is mainly governed by the macroscopic bulk flow, whereas molecular slip and wetting in the vicinity of the CL have a minor effect. As a result, the apparent contact angle continuously increases, and after some time rolling motion inevitably sets in. After a longer time, the shape of the free surface tends to become close to circular, albeit distinct from a circle. This is because at the late stage of squeezing, the shape of the free surface is determined mainly by the viscous stresses, which dominate capillary stresses due to the surface tension.
AB - Squeezing of a droplet between a pair of plates serves as an experimental method for probing the dynamics of moving contact lines (CL). It is also indicative of a possible interplay between inner-scale effects and the bulk flow hydrodynamics. In this paper strong squeezing of a two-dimensional liquid droplet between parallel plates moving against each other is studied in the inertialess approximation. It is shown that the dynamics of the moving CL is mainly governed by the macroscopic bulk flow, whereas molecular slip and wetting in the vicinity of the CL have a minor effect. As a result, the apparent contact angle continuously increases, and after some time rolling motion inevitably sets in. After a longer time, the shape of the free surface tends to become close to circular, albeit distinct from a circle. This is because at the late stage of squeezing, the shape of the free surface is determined mainly by the viscous stresses, which dominate capillary stresses due to the surface tension.
KW - Apparent contact angle
KW - Droplets
KW - Moving contact line
KW - Squeezing flow
UR - http://www.scopus.com/inward/record.url?scp=0036608763&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036608763&partnerID=8YFLogxK
U2 - 10.1016/S0301-9322(02)00014-9
DO - 10.1016/S0301-9322(02)00014-9
M3 - Article
VL - 28
SP - 911
EP - 925
JO - International Journal of Multiphase Flow
JF - International Journal of Multiphase Flow
SN - 0301-9322
IS - 6
ER -