Visualization of Local Concentration and Viscosity Distribution during Glycerol-Water Mixing in a Y-Shape Minichannel: A Proof-of-Concept-Study

Medina, Isabel; Deuerling, Julian; Kumari, Pooja; Scholl, Stephan; Rädle, Matthias

doi:10.3390/mi12080940

Open AccessArticle

Visualization of Local Concentration and Viscosity Distribution during Glycerol-Water Mixing in a Y-Shape Minichannel: A Proof-of-Concept-Study

by

Isabel Medina

¹

,

Julian Deuerling

¹

,

Pooja Kumari

¹

,

Stephan Scholl

²

and

Matthias Rädle

^1,*

¹

Center for Mass Spectrometry and Optical Spectroscopy, Mannheim University of Applied Sciences, Paul-Wittsack-Straße 10, 68163 Mannheim, Germany

²

Technische Universität Braunschweig, Institute for Chemical and Thermal Process Engineering, Langer Kamp 7, 38106 Braunschweig, Germany

^*

Author to whom correspondence should be addressed.

Micromachines 2021, 12(8), 940; https://doi.org/10.3390/mi12080940

Submission received: 4 July 2021 / Revised: 6 August 2021 / Accepted: 7 August 2021 / Published: 10 August 2021

(This article belongs to the Special Issue Micro-Reaction Engineering)

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Abstract

The work presents an efficient and non-invasive method to visualize the local concentration and viscosity distribution of two miscible and non-reacting substances with a significant viscosity difference in a microchannel with a Y-shape cell. The proof-of-concept setup consists of a near-infrared (NIR) camera and cost-effective dome lighting with NIR light-emitting diodes (LED) covering the wavelength range of 1050 to 1650 nm. Absorption differences of glycerol and water and their mixtures with a mass fraction of glycerol from 0 to 0.95

g_{G l y c} g_{t o t a l}^{- 1}

were analyzed in the NIR spectral area. The resulting measurement images were converted in a concentration profile by using absorbance calculated with Lambert–Beer law. A linear behavior between the concentration and the absorption coefficient is demonstrated. The result of local concentration in mass fraction was used to determine the local viscosity and illustrated as distribution images. By variating the fluid parameters, the influences of the highly different original viscosities in the mixing procedure were investigated and visualized.

Keywords: concentration-distribution imaging; glycerol; microchannel; near-infrared; viscosity; water

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MDPI and ACS Style

Medina, I.; Deuerling, J.; Kumari, P.; Scholl, S.; Rädle, M. Visualization of Local Concentration and Viscosity Distribution during Glycerol-Water Mixing in a Y-Shape Minichannel: A Proof-of-Concept-Study. Micromachines 2021, 12, 940. https://doi.org/10.3390/mi12080940

AMA Style

Medina I, Deuerling J, Kumari P, Scholl S, Rädle M. Visualization of Local Concentration and Viscosity Distribution during Glycerol-Water Mixing in a Y-Shape Minichannel: A Proof-of-Concept-Study. Micromachines. 2021; 12(8):940. https://doi.org/10.3390/mi12080940

Chicago/Turabian Style

Medina, Isabel, Julian Deuerling, Pooja Kumari, Stephan Scholl, and Matthias Rädle. 2021. "Visualization of Local Concentration and Viscosity Distribution during Glycerol-Water Mixing in a Y-Shape Minichannel: A Proof-of-Concept-Study" Micromachines 12, no. 8: 940. https://doi.org/10.3390/mi12080940

APA Style

Medina, I., Deuerling, J., Kumari, P., Scholl, S., & Rädle, M. (2021). Visualization of Local Concentration and Viscosity Distribution during Glycerol-Water Mixing in a Y-Shape Minichannel: A Proof-of-Concept-Study. Micromachines, 12(8), 940. https://doi.org/10.3390/mi12080940

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Visualization of Local Concentration and Viscosity Distribution during Glycerol-Water Mixing in a Y-Shape Minichannel: A Proof-of-Concept-Study

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