FLUTE Seminar - 6th October 2021

The Fluids and Thermal Engineering Research Group warmly invites you
to attend their Wednesday Seminar on 6th October, 2.00pm, Room C13, ESLC

"Long-range LIF: wave formation, interaction and transitions in process of flow development"

Guest Speaker: Dr Andrey Cherdantsev

Abstract

The stage of developing flow takes a substantial length of the duct in gas-liquid flows. It has a crucial effect on the characteristics of the ’stabilized’ flow. Experimental investigation of flow development requires simultaneous measurements of the flow properties in a large number of points across long distances. The present talk describes the development of air-water annular flow in vertical and horizontal pipes, analyzed using the Brightness-Based Laser-Induced Fluorescence technique. Spatiotemporal evolution of film thickness is analyzed to elucidate the processes of formation, development, and interaction of the disturbance waves. A method to control the disturbance wave parameters is proposed and validated. Finally, the transition from stratified to annular flow pattern in a horizontal pipe is analyzed to clarify the role of the waves and the secondary flow in the transition process.     

Andrey Cherdantsev, Kutateladze Institute of Thermophysics, Novosibirsk, Russia.