Free-Flowing Shear-Thinning Liquid Film in Inclined μ-Channels

Among the most important variables in the design of falling film microreactors (FFMRs) is the liquid film thickness as well as the gas/liquid interfacial area, which dictate the mass and heat transfer rates. In a previous work conducted in our lab the characteristics of a free-falling Newtonian liqu...

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Bibliographic Details
Published inFluids (Basel) Vol. 4; no. 1; p. 8
Main Authors Koupa, Angeliki, Stergiou, Yorgos, Mouza, Aikaterini
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 10.01.2019
Subjects
Accuracy
Algorithms
Computational fluid dynamics
Contact angle
Design
Experiments
FFMR
Film thickness
Fluid dynamics
free-flowing film
Heat transfer
Hydrodynamics
Inclination angle
inclined μ-channel
meniscus
Microchannels
Microreactors
Microscopy
Newtonian liquids
non-Newtonian
Particle image velocimetry
Physical properties
Shear
shear thinning
Shear thinning (liquids)
Thinning
Viscosity
μ-PIV
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Summary:Among the most important variables in the design of falling film microreactors (FFMRs) is the liquid film thickness as well as the gas/liquid interfacial area, which dictate the mass and heat transfer rates. In a previous work conducted in our lab the characteristics of a free-falling Newtonian liquid film have been studied and appropriate correlations have been proposed. In this work the geometrical characteristics of a non-Newtonian shear thinning liquid, flowing in an inclined open microchannel, have been experimentally investigated and design correlations that can predict with reasonable accuracy the features of a FFMR have been proposed. The test section used was an open μ-channel with square cross section (WO = 1200 μm) made of brass which can be set to various inclination angles. The liquid film characteristics were measured by a non-intrusive technique that is based on the features of a micro Particle Image Velocimetry (μ-PIV) system. Relevant computational fluid dynamics (CFD) simulations revealed that the volume average dynamic viscosity over the flow domain is practically the same as the corresponding asymptotic viscosity value, which can thus be used in the proposed design equations. Finally, a generalized algorithm for the design of FFMRs, containing non-Newtonian shear thinning liquids, is suggested.
ISSN:2311-5521
2311-5521
DOI:10.3390/fluids4010008