Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel
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,...
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doaj-575f3efe417b4454a705b36e1d12eeaa2020-11-25T00:52:55ZengMDPI AGProcesses2227-97172019-10-0171076510.3390/pr7100765pr7100765Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square MicrochannelJin-yuan Qian0Min-rui Chen1Zan Wu2Zhi-jiang Jin3Bengt Sunden4Institute of Process Equipment, Zhejiang University, Hangzhou 310027, ChinaInstitute of Process Equipment, Zhejiang University, Hangzhou 310027, ChinaDepartment of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, SwedenInstitute of Process Equipment, Zhejiang University, Hangzhou 310027, ChinaDepartment of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, SwedenThe 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 <i>t</i><sub>0</sub>, are investigated. Results show that when the cycle of the disperse phase flow rate is larger than <i>t</i><sub>0</sub>, 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.https://www.mdpi.com/2227-9717/7/10/765liquid-liquid slug flowslug generationdynamic injection flow ratemicrochannelcomputational fluid dynamics |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jin-yuan Qian Min-rui Chen Zan Wu Zhi-jiang Jin Bengt Sunden |
spellingShingle |
Jin-yuan Qian Min-rui Chen Zan Wu Zhi-jiang Jin Bengt Sunden Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel Processes liquid-liquid slug flow slug generation dynamic injection flow rate microchannel computational fluid dynamics |
author_facet |
Jin-yuan Qian Min-rui Chen Zan Wu Zhi-jiang Jin Bengt Sunden |
author_sort |
Jin-yuan Qian |
title |
Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel |
title_short |
Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel |
title_full |
Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel |
title_fullStr |
Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel |
title_full_unstemmed |
Effects of a Dynamic Injection Flow Rate on Slug Generation in a Cross-Junction Square Microchannel |
title_sort |
effects of a dynamic injection flow rate on slug generation in a cross-junction square microchannel |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2019-10-01 |
description |
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 <i>t</i><sub>0</sub>, are investigated. Results show that when the cycle of the disperse phase flow rate is larger than <i>t</i><sub>0</sub>, 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. |
topic |
liquid-liquid slug flow slug generation dynamic injection flow rate microchannel computational fluid dynamics |
url |
https://www.mdpi.com/2227-9717/7/10/765 |
work_keys_str_mv |
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