Investigation of Slug Flow in Microchannel Boiling by Impedimetric Sensing

In this work, the possibility of using an AD5933 chip in an impedance logging system to monitor two-phase flow boiling in microchannels is investigated. Microchannel boiling flow regimes include bubbly, annular, churn, and slug flow. We have investigated the application of local impedance sensors to monitor boiling flow, specifically in the slug regime, as a demonstration case of the sensing concept. The logged impedance amplitude data from the AD5933 were validated by synchronized high-speed videos. Further post processing analysis of the results represents a great potential in using impedance sensing information on microchannel boiling by obtaining critical local information about the flow such as slug pulse width, slug frequency, and duty cycle.

[1]  John R. Thome,et al.  Heat Transfer Model for Evaporation in Microchannels, Part I: Presentation of the Model , 2004 .

[2]  Arnout Willockx,et al.  Capacitance signal analysis of horizontal two-phase flow in a small diameter tube , 2008 .

[3]  Fernando Seoane,et al.  AD5933-based Spectrometer for Electrical Bioimpedance Applications , 2010 .

[4]  I. Mudawar.  Two-Phase Micro-Channel Heat Sinks: Theory, Applications and Limitations , 2011 .

[5]  I. Mudawar.  Two-Phase Microchannel Heat Sinks: Theory, Applications, and Limitations , 2011 .

[6]  Suresh V. Garimella,et al.  Electrical impedance-based void fraction measurement and flow regime identification in microchannel flows under adiabatic conditions , 2012 .

[7]  Suresh V. Garimella,et al.  Design of a non-intrusive electrical impedance-based void fraction sensor for microchannel two-phase flows , 2014 .

[8]  Rigoberto E. M. Morales,et al.  Capacitive measuring system for two-phase flow monitoring. Part 1: Hardware design and evaluation , 2016 .

[9]  Patrick Ruther,et al.  High-channel-count impedance spectroscopy logger , 2017, 2017 8th International IEEE/EMBS Conference on Neural Engineering (NER).

[10]  Thomas Stieglitz,et al.  Concept and Development of an Electronic Framework Intended for Electrode and Surrounding Environment Characterization In Vivo , 2016, Sensors.

[11]  P. Lee,et al.  A diagnostic tool for detection of flow-regimes in a microchannel using transient wall temperature signal , 2017 .

[12]  K. Cobry,et al.  Transparent Glass/SU8-Based Microfluidic Device with on-Channel Electrical Sensors , 2017 .

[13]  J. Thome,et al.  An updated three-zone heat transfer model for slug flow boiling in microchannels , 2017 .

[14]  Talebi,et al.  Investigation of boiling phenomena in microchannels using impedance spectroscopy technique correlated with high-speed videography , 2017 .

[15]  Tassos G. Karayiannis,et al.  Flow boiling in microchannels: Fundamentals and applications , 2017 .

[16]  Peter Woias,et al.  Analysis of impedance data from bubble flow in a glass/SU8 microfluidic device with on-channel sensors , 2018, Sensors and Actuators A: Physical.

[17]  K. Cobry,et al.  Spatial sensitivity analysis of fluid mixing in a plate-and-frame microreactor channel via electric impedance spectroscopy with switchable working electrodes , 2018, Flow Measurement and Instrumentation.

[18]  R. Dittmeyer,et al.  Flow Regime Detection of Boiling Flow in Microchannels Using Electrical Sensing Elements Validated by Videography , 2018, ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels.

[19]  R. Dittmeyer,et al.  Investigation of water microchannel boiling flow regimes using electrical sensing elements along a single microchannel , 2019, Measurement Science and Technology.