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Mixing Time Scale Determination in Microchannels Using Reaction Calorimetry
Author(s) -
Reichmann Felix,
Vennemann Kai,
Frede Timothy Aljoscha,
Kockmann Norbert
Publication year - 2019
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201800169
Subject(s) - exothermic reaction , mixing (physics) , microreactor , calorimeter (particle physics) , micromixer , adiabatic process , volumetric flow rate , thermodynamics , microchannel , flow (mathematics) , mechanics , flux (metallurgy) , chemistry , heat flux , materials science , calorimetry , microfluidics , heat transfer , optics , physics , biochemistry , organic chemistry , quantum mechanics , detector , catalysis
Mixing time scales are derived from heat flux profiles for an instantaneous and exothermic reaction in a commercially available microreactor. A continuous reaction calorimeter, based on numerous heat flux sensors, is used to record spatially resolved heat flux profiles in steady state. Total volumetric flow rate is varied at constant flow rate ratio and the region of main reaction progress is shifted within the microreactor according to the advancement of the mixing process. Secondary flow patterns, induced by Dean mixing elements within the microchannel at higher flow rates, enhance the mixing. Results display a decrease in mixing time at increased flow rates and energy dissipation rate. Additionally, the passive micromixer is evaluated regarding its efficiency.