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Numerical Study of Capillary Flow in Microchannels With Alternate Hydrophilic-Hydrophobic Bottom Wall

DSpace at IIT Bombay

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Title Numerical Study of Capillary Flow in Microchannels With Alternate Hydrophilic-Hydrophobic Bottom Wall
 
Creator SAHA, AA
MITRA, SK
 
Subject surface-tension
dynamics
liquid
lines
capillarity
contact angle
flow simulation
hydrophilicity
hydrophobicity
microchannel flow
numerical analysis
pattern formation
surface tension
 
Description A two-dimensional numerical simulation of flow in patterned microchannel with alternate layers of different sizes of hydrophilic and hydrophobic surfaces at the bottom wall is conducted here. The effect of specified contact angle and working fluid (de-ionized (DI) water and ethanol) on capillary phenomena is observed here. The volume of fluid method is used for simulating the free surface flow in the microchannel. Meniscus profiles with varying amplitude and shapes are obtained under the different specified surface conditions. Nonsymmetric meniscus profiles are obtained by changing the contact angles of the hydrophilic and hydrophobic surfaces. A meniscus stretching parameter is defined here and its relation to the capillary phenomena in the microchannel is discussed. Flow variation increases as the fluid traverses alternately between the hydrophilic and hydrophobic regions. The pattern size and the surface tension of the fluid are found to have significant influence on the capillary phenomena in the patterned microchannel. Smaller pattern size produces enhanced capillary effect with DI water, whereas no appreciable gain is observed for ethanol. The magnitude of maximum velocity along the channel height varies considerably with the pattern size and the contact angle. Also, the rms velocity is found to be higher for smaller alternate patterned microchannel. The meniscus average velocity difference at the top and bottom walls increases for a dimensionless pattern size of 0.6 and thereafter it decreases with the increase in pattern size in the case of DI water with hydrophilic-hydrophobic pattern. Using such patterned microchannel, it is possible to manipulate and optimize fluid flow in microfluidic devices, which require enhanced mixing for performing biological reactions.
 
Publisher ASME-AMER SOC MECHANICAL ENG
 
Date 2011-07-18T18:41:09Z
2011-12-26T12:50:46Z
2011-12-27T05:36:50Z
2011-07-18T18:41:09Z
2011-12-26T12:50:46Z
2011-12-27T05:36:50Z
2009
 
Type Article
 
Identifier JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, 131(6), -
0098-2202
http://dx.doi.org/10.1115/1.3129130
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5020
http://hdl.handle.net/10054/5020
 
Language en