An experimental device for calibration of concentration and velocity of two-phase flow based on electrical impedance measurement system

2021 ◽  
Author(s):  
Jiacheng Wu ◽  
Shihong Yue ◽  
Haitao Ma
Keyword(s):  
Measurement System ◽  
Electrical Impedance ◽  
Two Phase Flow ◽  
Impedance Measurement ◽  
Experimental Device ◽  
Phase Flow ◽  
Two Phase ◽  
Electrical Impedance Measurement

Flow Regime Detection of Boiling Flow in Microchannels Using Electrical Sensing Elements Validated by Videography

2018 ◽  
Author(s):  
Mohammadmahdi Talebi ◽  
Keith Cobry ◽  
Sahba Sadir ◽  
Roland Dittmeyer ◽  
Peter Woias
Keyword(s):  
Indium Tin Oxide ◽  
Electrical Impedance ◽  
Two Phase Flow ◽  
Bubbly Flow ◽  
Protective Layer ◽  
Phase Flow ◽  
Two Phase ◽  
Impedance Measurements ◽  
Electrical Sensing ◽  
Boiling Flow

In this work we present a method that provides the possibility to analyze directly the electrical properties of two-phase flow in microchannel boiling systems. It is shown that the use of impedimetric sensing techniques can be used to track two-phase boiling flow. In order to perform such measurements, the electrical impedance of the composite medium in the channel is measured using planar capacitive elements that are implemented over the channel on a glass lid. Working electrodes are fabricated using indium tin oxide on glass and are compressed against a precision machined metal microchannel. Therefore, it is possible to visually analyze two-phase flow inside the microchannel while simultaneously performing electrical impedance measurements. In order to prevent electrochemical reactions between the fluid inside the microchannel and electrodes on the glass lid, a thin layer of SU8 photoresist was deposited as a protective layer. The electrical impedance measurements were characterized over two-phase flow regimes including bubbly flow, slug flow and annular flow via comparison with simultaneous video recordings.

Impedance-Based Void Fraction Measurement and Flow Regime Identification in Microchannel Flows

2011 ◽  
Author(s):  
Sidharth Paranjape ◽  
Susan N. Ritchey ◽  
Suresh V. Garimella
Keyword(s):  
Flow Regime ◽  
Void Fraction ◽  
High Speed ◽  
Electrical Impedance ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Electrical Conductance ◽  
Statistical Characteristics ◽  
Phase Flow ◽  
Two Phase

Electrical impedance of a two-phase mixture is a function of void fraction and phase distribution. The difference in the electrical conductance and permittivity of the two phases can be exploited to measure electrical impedance for obtaining void fraction and flow regime characteristics. An electrical impedance meter is constructed for the measurement of void fraction in microchannel two-phase flow. The experiments are conducted in air-water two-phase flow under adiabatic conditions. A transparent acrylic test section of hydraulic diameter 780 micrometer is used in the experimental investigation. The impedance void meter is calibrated against the void fraction measured using analysis of images obtained with a high-speed camera. Based on these measurements, a methodology utilizing the statistical characteristics of the void fraction signals is employed for identification of microchannel flow regimes.

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