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Open AccessFeature PaperArticle

Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel

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Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China
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Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, Sweden
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State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
*
Author to whom correspondence should be addressed.
Processes 2019, 7(10), 765; https://doi.org/10.3390/pr7100765
Received: 3 September 2019 / Revised: 15 October 2019 / Accepted: 16 October 2019 / Published: 18 October 2019
(This article belongs to the Special Issue Smart Flow Control Processes in Micro Scale)
The injection flow rates of two liquid phases play a decisive role in the slug generation of the liquid-liquid slug flow. However, most injection flow rates so far have been constant. In order to investigate the effects of dynamic injection flow rates on the slug generation, including the slug size, separation distance and slug generation cycle time, a transient numerical model of a cross-junction square microchannel is established. The Volume of Fluid method is adopted to simulate the interface between two phases, i.e., butanol and water. The model is validated by experiments at a constant injection flow rate. Three different types of dynamic injection flow rates are applied for butanol, which are triangle, rectangular and sine wave flow rates. The dynamic injection flow rate cycles, which are related to the constant slug generation cycle time t0, are investigated. Results show that when the cycle of the disperse phase flow rate is larger than t0, the slug generation changes periodically, and the period is influenced by the cycle of the disperse phase flow rate. Among the three kinds of dynamic disperse flow rate, the rectangular wave influences the slug size most significantly, while the triangle wave influences the separation distance and the slug generation time more prominently. View Full-Text
Keywords: liquid-liquid slug flow; slug generation; dynamic injection flow rate; microchannel; Computational Fluid Dynamics liquid-liquid slug flow; slug generation; dynamic injection flow rate; microchannel; Computational Fluid Dynamics
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MDPI and ACS Style

Qian, J.-Y.; Chen, M.-R.; Wu, Z.; Jin, Z.-J.; Sunden, B. Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel. Processes 2019, 7, 765.

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