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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The instantaneous mixing degree of time pulsing flow with different frequency at flow rates of (a) = 50 µL/h; (b) = 200 µL/h; (c) = 500 µL/h at flow distance 2000 µm; (d) the concentration profiles at the peak-value and dip-value time instances when = 500 µL/h.