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Title: Hydrodynamic dispersion in thin channels with micro-structured porous walls

Abstract

Flowand transport within porous- and microtextured-walled channels is relevant to a number of natural and industrial processes. Designing and optimizing the topology of the pores and/or microstructure to achieve target performance at the system scale (or macroscale) is still an open question. In this work, we study whether hydrodynamic dispersion in microfluidic channels with walls structured by obstacles can be modeled by dispersion in channels with porous walls described as continuous porous media of zero or finite permeability. We perform single phase microfluidic non-reactive flow experiments in channels embedded in micropatterns with different topologies. Specifically, we focus on transverse riblets and arrays of pillars as examples of impermeable and permeable obstructions, respectively. We compare the experimental results with three models: 3D pore-scale simulations which resolve the micropattern geometry explicitly and two upscaled models which treat the micropattern as a continuum of zero or finite permeability. This study demonstrates that polydimethylsiloxane micromodels with appropriately patterned surfaces can be successfully employed to validate various continuum-scale modeling approximations in different physical regimes, identified by the order of magnitude of the Peclet number and the obstruction permeability.

Authors:
 [1];  [2];  [2];  [3]
  1. SAN DIEGO STATE UNIVERSITY
  2. BATTELLE (PACIFIC NW LAB)
  3. San Diego State University
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1558190
Report Number(s):
PNNL-SA-138384
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Physics of Fluids
Additional Journal Information:
Journal Volume: 30; Journal Issue: 7
Country of Publication:
United States
Language:
English

Citation Formats

Ling, Bowen, Oostrom, Martijn L., Tartakovsky, Alexandre M., and Battiato, Ilenia. Hydrodynamic dispersion in thin channels with micro-structured porous walls. United States: N. p., 2018. Web. doi:10.1063/1.5031776.
Ling, Bowen, Oostrom, Martijn L., Tartakovsky, Alexandre M., & Battiato, Ilenia. Hydrodynamic dispersion in thin channels with micro-structured porous walls. United States. https://doi.org/10.1063/1.5031776
Ling, Bowen, Oostrom, Martijn L., Tartakovsky, Alexandre M., and Battiato, Ilenia. Sun . "Hydrodynamic dispersion in thin channels with micro-structured porous walls". United States. https://doi.org/10.1063/1.5031776.
@article{osti_1558190,
title = {Hydrodynamic dispersion in thin channels with micro-structured porous walls},
author = {Ling, Bowen and Oostrom, Martijn L. and Tartakovsky, Alexandre M. and Battiato, Ilenia},
abstractNote = {Flowand transport within porous- and microtextured-walled channels is relevant to a number of natural and industrial processes. Designing and optimizing the topology of the pores and/or microstructure to achieve target performance at the system scale (or macroscale) is still an open question. In this work, we study whether hydrodynamic dispersion in microfluidic channels with walls structured by obstacles can be modeled by dispersion in channels with porous walls described as continuous porous media of zero or finite permeability. We perform single phase microfluidic non-reactive flow experiments in channels embedded in micropatterns with different topologies. Specifically, we focus on transverse riblets and arrays of pillars as examples of impermeable and permeable obstructions, respectively. We compare the experimental results with three models: 3D pore-scale simulations which resolve the micropattern geometry explicitly and two upscaled models which treat the micropattern as a continuum of zero or finite permeability. This study demonstrates that polydimethylsiloxane micromodels with appropriately patterned surfaces can be successfully employed to validate various continuum-scale modeling approximations in different physical regimes, identified by the order of magnitude of the Peclet number and the obstruction permeability.},
doi = {10.1063/1.5031776},
url = {https://www.osti.gov/biblio/1558190}, journal = {Physics of Fluids},
number = 7,
volume = 30,
place = {United States},
year = {2018},
month = {7}
}

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