Research into Multi-scale Examination of MultiPHase physIcs in flowS (MEMPHIS)

Posted by Joao Vasques | August - 1 - 2017 | 0 Comment

The work entitled as ‘Comparison of Disturbance Wave Parameters with Flow Orientation in Vertical Annular Gas-Liquid Flows in a Small Pipe’ has been presented at the 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics on 12th – 15th of June in Brazil. It is with great pleasure to announce that the conference paper has been selected for submission to the Virtual Special Issue of Experimental Thermal and Fluid Science dedicated to ExHFT-9.

Please find below the abstract of the aforementioned paper:

COMPARISON OF DISTURBANCE WAVE PARAMETERS WITH FLOW ORIENTATION IN VERTICAL ANNULAR GAS-LIQUID FLOWS IN A SMALL PIPE

Joao Vasques*, Mikhail Cherdantsev, Andrey Cherdantsev, David Hann, Buddhika Hewakandamby, Barry Azzopardi

Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom

*joao.vasques@nottingham.ac.uk

Kutateladze Institute of Thermophysics, Novosibirsk, Russia

 

Abstract. The interfacial wave structure of the liquid phase in both upwards and downwards gas-liquid flows in an 11.7 mm pipe were investigated using the Brightness Based Laser Induced Fluorescence technique (BBLIF). Due to the versatility of the BBLIF technique, film thickness measurements were carried out over different axial locations covering a measurement area with very high spatial and temporal resolution. More specifically this comprises of measurements obtained between 330-430 mm from the inlet (between 28 to 37 z/D), where the properties of disturbance waves are almost stabilized. Using a tracking algorithm to detect disturbance waves, a full characterization in terms of their velocity, distance and time separation (both in average values and in terms of their distribution), frequency, intermittency and wave width was carried out. Direct comparison between both flow orientations while testing the same flow conditions shows that although the disturbance waves travel at the same velocity and have the same wave width, the frequency of these waves is higher for the downwards case. This has therefore an impact in subsequent parameters such as distance and time separation of the disturbance waves. Finally, an Omega-K analysis was conducted, which shows an increase in the ratio between the ripple and disturbance wave velocities with increasing gas velocity for the upwards case, whereas for the downwards case, the ratio is constant under the same conditions, which is an indication of a discrepancy in terms of the base film thickness with flow orientation.

 

Additionally, the work entitled as ‘Detailed Characterization of Undeveloped Upwards Annular Flow using the Brightness Based Laser Induced Fluorescence Technique’ has been given a ‘Best Paper Award’ by the committee of the 2nd World Congress on Momentum, Heat and Mass Transfer, held on 6-8th of April, in Barcelona, Spain.

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