A new method using an indigenously developed electronic circuit for identifying all the flow regime transitions in a vertical upward gas-liquid two-phase flow is reported. The circuit basically converts the void fraction signal of the twophase mixture into a series of square pulses of varying width. The probability density function of the pulse width spectra is analysed for detection of bubble-toslug flow transition. Slug-to-churn flow transition is detected on the basis of liquid slug length measurements. Churn to annular flow transition is identified on the basis of t h e number of liquid bridging. Experimental analysis shows that, in bubble flow through narrow tubes, bubbles bigger than a critical size cannot exist without forming ,Taylor bubbles. The technique has potential to minimize substantially the adverse effects of electrode polarization, stray impedance and varying conductance of the liquid medium. The sampling time and sampling frequency can be varied independently. The circuit can be used for measurement of both conducting and dielectric fluids.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.