30am2-PN-18 On-line measurement of diffusion coefficient using two phase flow in microchannel

2015 ◽  
Vol 2015.7 (0) ◽  
pp. _30am2-PN--_30am2-PN-
Author(s):  
Yu Yamaguchi ◽  
Sachiko Odake ◽  
Toru Torii
2014 ◽  
Vol 643 ◽  
pp. 213-217
Author(s):  
Yan Jun Zhang

Two-phase flow measurement plays an increasingly important role in the real-time, on-line control of industrial processes including fault detection and system malfunction. Many experimental and theoretical researches have done in the field of tomography image reconstruction. However, the reconstruction process cost quite long time so that there are number of challenges in the real applications. An alternative approach to monitor two-phase flow inside a pipe/vessel is to take advantage of identification of flow regimes. This paper proposes a new identification approach for common two phase flow using LDA feature extraction and Support Vector Machine based on Electrical Tomography measurement. Simulation was carried out for typical flow regimes using the approach. The results show its feasibility, and the results indicate that this method is fast in speed and can identify these flow regimes correctly.


1972 ◽  
Vol 186 (1) ◽  
pp. 449-455 ◽  
Author(s):  
K. F. Gill ◽  
E. W. Reed

A literature survey into gas-solids flow has revealed that most of the existing work is of a theoretical nature. Of fundamental importance to this theoretical work is the concept of sonic velocity. Presented here is a novel method that enables this parameter to be measured experimentally. The technique used is to inject small amplitude pseudo random binary sequence pressure disturbances into a two-phase flow system and compute a cross-correlation function between two measuring locations within the flow system. The time shift of the peak value of this function gives a direct measure of the sonic velocity existing between these two locations. The experimental results demonstrate that by using a pseudo random pressure disturbance on-line evaluation of sonic velocity becomes feasible.


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