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Effect of thermocapillary stress on slip length for a channel textured with parallel ridges

Published online by Cambridge University Press:  06 February 2017

Marc Hodes ,
Toby L. Kirk ,
Georgios Karamanis  and
Scott MacLachlan
Marc Hodes*
Affiliation:
Department of Mechanical Engineering, Tufts University, Medford, MA 02155, USA
Toby L. Kirk
Affiliation:
Department of Mathematics, Imperial College London, London SW7 2AZ, UK
Georgios Karamanis
Affiliation:
Department of Mechanical Engineering, Tufts University, Medford, MA 02155, USA
Scott MacLachlan
Affiliation:
Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, Canada
*
†Email address for correspondence: marc.hodes@tufts.edu
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Abstract

We compute the apparent hydrodynamic slip length for (laminar and fully developed) Poiseuille flow of liquid through a heated parallel-plate channel. One side of the channel is textured with parallel (streamwise) ridges and the opposite one is smooth. On the textured side of the channel, the liquid is in the Cassie state. No-slip and constant heat flux boundary conditions are imposed at the solid–liquid interfaces along the tips of the ridges, and the menisci between ridges are considered to be flat and adiabatic. The smooth side of the channel is subjected to no-slip and adiabatic boundary conditions. We account for the streamwise and transverse thermocapillary stresses along menisci. When the latter is sufficiently small, Stokes flow may be assumed. Then, our solution is based upon a conformal map. When, additionally, the ratio of channel height to half of the ridge pitch is of order 1 or larger, an accurate but less cumbersome solution follows from a matched asymptotic expansion. When inertial effects are relevant, the slip length is numerically computed. Setting the thermocapillary stress equal to zero yields the slip length for an adiabatic flow.

JFM classification

Flow Control: Drag reduction Convection: Marangoni convection Micro-/Nano-fluid dynamics: Microfluidics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 814 , 10 March 2017 , pp. 301 - 324
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Copyright
© 2017 Cambridge University Press 

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